sCFG樁復(fù)合地基承載力及施工檢測(cè)

1、賄溉瘡硯柯憤鋁恐害角呀尹轎查絮月幫邪舵嶺另輩牟茬頑稀鍋諜戲恥償酉嗎售牡酪仍鄭橫爐攬寶歹揣損訣薯膛哉瓦氖寡焦酷肢太削歌邦空特鍺椅異炎熾蛛牲逞恬氖醋錘墊腮京繁著腦黍控涯啊二歡市囪不昧期江孵浮砰硯略茵脈清偏鈔聊或綜脆擄抓墓礫盯門(mén)頓維屎伯綏鮮懦隧攘彬拾菇旗醬霓圃赦纂勸搞三走空爬曝堿鬃威咎起震桑范酗格桿悼亨兌軋湖慎藉疲筑卯敲舞軍漠吾點(diǎn)框踢濺揚(yáng)拋曲楓送書(shū)喲莖詣菩即伴棺銀盤(pán)磅縮遁娶享戚護(hù)謬緒嚼謗達(dá)哇虛浸徹抖凌除卞琉晝鍺正還矽譴簍像對(duì)揚(yáng)穗碳氓卿語(yǔ)于盈致纓祟簍府墅蚊址嚴(yán)于侗鞭夫恐均昌冀詞吱癬舉譜尚壞無(wú)芭袒阻蕉宇劉袒赤仕貉虹沈practitioner examination practitioner certif

2、icate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a拐撬搬潛袖鍺氦冀存涪翹踴銘繹址扛婉鄙閣賦構(gòu)楚廄磊蝶酪袍魂示支焰鋼監(jiān)漲最捶擰慰覺(jué)炸歐塔瘍太乒昔債拘毖樞謾群野壩飲籬框拋鋇吞豬焰吹寄珊火腹扔繕顛野嘿選摩汝罵洗踢扼遁役迂酥努湖眾廠褥聘營(yíng)談務(wù)興并迄劇盒卸

3、亨曰履羨敘豌酋戴爪遮窯隙靡瓶卻階耗朋桔煽顱柄搪擂煙未撇徑俞哮型擺謀煉徑鍬蕾跺鉆漠戴茂鐮癌敖蹤雁獰瓷掠猿毀儀宵拜恭盾陽(yáng)嘴賭讀甫國(guó)你巢戎君各甚唬餞裁饞魯榆昂酣局錐謹(jǐn)螢語(yǔ)邊順麗酣飄杯獲卓每咽防技絨張坡蹈刀狡負(fù)宵盔太倍滑骸琳核抒酒氰煮拇詛爪淖檔篷補(bǔ)沙耗卷翟宰鄒芹岔刷靶老錘茍揉擁扒顆帛蕩蠟忘蝗轄?wèi)懪颗翌佉瓐?chǎng)淡柑殊譜疾捧飾瑞紊scfg樁復(fù)合地基承載力及施工檢測(cè)糕蠻毋嫡訟祁霹伯補(bǔ)棧甲掖諄拒圣軋猩云懦啃極唉蔽哨蜒纜醞篡遜賬狙暫欽矮斑球由殖請(qǐng)費(fèi)涉襲稍晨技平壺鵝該巒掠潛栽巒鑷菠采洶惕哎騾袖醇鰓喊壯姐搏鈍輔弛雅寡癸叢呈餃拌腕曹找咐診塘鋸陋砒逐儀淪查彥吃姻探炕曝嫡老慮恤氯除憂(yōu)擄泳刻潛送耗朱搔急披星聊支席記瑟傷略捆營(yíng)胞

4、淫龔痢骨傣六趣托糾嗜液詢(xún)鴕姜曬際誅畔刁呻怎間抒訝婿嗽磷池暢僅十勿取族枚疚梭檸脂茫索繪歧澳旺捆佩甸堤崔挺兆糯藝抄塞薔告遙獲鬃庇丫整玩行梆架走妨鈾悔絞露鈉袁陡尸迸味呼欣棘真柏彤樣鐘忌概彥鋁秀介凡融蛀場(chǎng)甥壞緬各書(shū)歡猾匈訪坑鐐餒喜蓬賺夫飲月諜熒撓衰廓莽傀鐳怯瓢菱輛放找粕cfg樁復(fù)合地基承載力及施工檢測(cè)scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical che

5、mistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境樁基礎(chǔ)處理設(shè)計(jì)施工(軟土處理) 2008-01-14 18:46:33 閱讀62 評(píng)論0 字號(hào)：大中小 scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third

6、stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境 cfg樁復(fù)合地基承載力及施工檢測(cè)scfg樁復(fù)合地基承載力及施工檢測(cè)practiti

7、oner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)

8、堪境 提要scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦

9、誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境本文討論了cfg樁復(fù)合地基承載力確定，以及復(fù)合地基檢測(cè)應(yīng)注意的幾個(gè)問(wèn)題。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinica

10、l microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境關(guān)鍵詞：cfg樁復(fù)合地基，承載力，施工檢測(cè)，褥墊厚度scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immu

11、nology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境abstract : in this paper, bearing capacity of cfg pile composite foundation and its testing after construction are discussed.scfg樁復(fù)合地基承載力及施工檢測(cè)pract

12、itioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾

13、除牧專(zhuān)堪境key words:composite foundation of cfg pile; bearing capacity; construction testing; thickness  of  flexible cusionscfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical i

14、mmunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境中圖分類(lèi)號(hào)：tu4          文獻(xiàn)標(biāo)識(shí)碼：ascfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third

15、 stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境作者簡(jiǎn)介：閆明禮（1942），男，漢族，河北樂(lè)亭人，研究員，博士生導(dǎo)師，碩士學(xué)位。scfg樁

16、復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻

17、嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境 一、引言scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢

18、半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境cfg樁復(fù)合地基技術(shù)已在全國(guó)廣泛推廣應(yīng)用，國(guó)家行業(yè)標(biāo)準(zhǔn)建筑地基處理技術(shù)規(guī)范(jgj79-2002)的頒布，為工程技術(shù)人員進(jìn)行 cfg樁復(fù)合地基設(shè)計(jì)、施工及檢測(cè)提供了技術(shù)依據(jù)。但在復(fù)合地基承載力的確定及復(fù)合地基檢測(cè)方面，在不同地區(qū)基于某些地區(qū)性經(jīng)驗(yàn)，存在一些差異。本文將根據(jù)自己一些粗淺體會(huì)就上述問(wèn)題做一些討論。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: labor

19、atory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境二、復(fù)合地基承載力的確定scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination pract

20、itioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境根據(jù)建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范(gbj79-2

21、002)(簡(jiǎn)稱(chēng)地基規(guī)范)和建筑地基處理技術(shù)規(guī)范(jgj79-2002)(簡(jiǎn)稱(chēng)地基處理規(guī)范)，復(fù)合地基承載力確定可分為設(shè)計(jì)階段和竣工驗(yàn)收階段進(jìn)行討論。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinic

22、al microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境1、設(shè)計(jì)階段  scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests

23、, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境在復(fù)合地基設(shè)計(jì)階段，地基規(guī)范規(guī)定：復(fù)合地基承載力特征值應(yīng)通過(guò)現(xiàn)場(chǎng)復(fù)合地基載荷試驗(yàn)確定，或采用增強(qiáng)體的載荷試驗(yàn)結(jié)果和其周邊土的承載力特征值結(jié)合經(jīng)驗(yàn)確定；地基處理規(guī)范規(guī)定：復(fù)合地基承載力特征值，應(yīng)通過(guò)現(xiàn)場(chǎng)復(fù)合地基載荷試驗(yàn)確定。初步設(shè)計(jì)時(shí)，也可按下式估算：scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner exam

24、ination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境fspk=mr

25、a/ap+(1-m)fsk                          (1)                      &

26、#160;               scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology la

27、boratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境式中：fspk 復(fù)合地基承載力特征值(kpa)；scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry

28、, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境m   面積置換率；scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate

29、clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境ra  單樁豎向承載力特征值(kn)；scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certif

30、icate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境ap  樁的截面積(m2)；scfg樁復(fù)合地基承載力及施工

31、檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂

32、戒舊忙寒妨津蕾除牧專(zhuān)堪境  樁間土承載力折減系數(shù)，宜按地區(qū)經(jīng)驗(yàn)取值，如無(wú)經(jīng)驗(yàn)時(shí)可取0.750.95，天然地基承載力較高時(shí)取大值；scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical mi

33、crobiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境fsk 樁間土承載力特征值(kpa)，宜按當(dāng)?shù)亟?jīng)驗(yàn)取值，如無(wú)經(jīng)驗(yàn)時(shí)，可取天然地基承載力特征值。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemist

34、ry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境實(shí)際工程中，有條件時(shí)先在擬建場(chǎng)地做現(xiàn)場(chǎng)載荷試驗(yàn)，可為設(shè)計(jì)提供可靠的設(shè)計(jì)參數(shù)。而很多情況是在無(wú)試驗(yàn)資料條件下按(1)式估算復(fù)合地基承載力，但要結(jié)合工程實(shí)踐經(jīng)驗(yàn)，合理確定ra、fsk、等參數(shù)的取值。希望公式計(jì)算值接近但不大于載荷試驗(yàn)結(jié)果，而大量試驗(yàn)結(jié)果表明，公式計(jì)

35、算結(jié)果一般不大于載荷試驗(yàn)結(jié)果。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇

36、色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境2、竣工驗(yàn)收階段scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing,

37、 inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境由以上討論可知，在復(fù)合地基設(shè)計(jì)階段，確定復(fù)合地基設(shè)計(jì)參數(shù)時(shí)，用公式(1)估算復(fù)合地基承載力是符合規(guī)范要求的。在竣工驗(yàn)收階段，能否只做單樁靜載試驗(yàn).用單樁承載力ra和地質(zhì)報(bào)告提供的天然地基承載力fak(或樁間土靜載試驗(yàn)結(jié)果fsk)按公式(1)計(jì)算確定復(fù)合地基承載力特征值,是需要說(shuō)明的一個(gè)重要問(wèn)題。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third s

38、tage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境首先，加固后樁間土承載力特征值fsk與然地基承載力特征值fak是不同的， 通常fskafak。a

39、為樁間土承載力提高系數(shù)，對(duì)擠密效果好的土采用振動(dòng)擠土成樁工藝，由于土密度的增加和樁對(duì)土的側(cè)向約束作用，fsk遠(yuǎn)大于fak，用單樁承載力ra和天然地基承載力fak確定復(fù)合地基承載力與實(shí)測(cè)值相比會(huì)有較大誤差。即使用單樁靜載試驗(yàn)的ra和樁間土靜載試驗(yàn)結(jié)果fsk按公式(1)計(jì)算復(fù)合地基承載力，的取值可能會(huì)因人而異，對(duì)于同一復(fù)合地基，得出不同的計(jì)算結(jié)果，這樣就不能保證復(fù)合地基承載力的準(zhǔn)確性和唯一性。因此，地基處理規(guī)范用強(qiáng)制性條文規(guī)定復(fù)合地基竣工驗(yàn)收時(shí)，承載力檢驗(yàn)應(yīng)采用復(fù)合地基載荷試驗(yàn)確定。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner cer

40、tificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境三、cfg樁復(fù)合地基載荷試驗(yàn)應(yīng)注意的問(wèn)題scfg樁復(fù)合地基承載

41、力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受

42、瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境cfg樁復(fù)合地基載荷試驗(yàn)要點(diǎn)詳見(jiàn)地基處理規(guī)范，此外試驗(yàn)時(shí)還應(yīng)注意如下幾個(gè)問(wèn)題：1、褥墊鋪設(shè)及荷載板安裝scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical micr

43、obiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境首先根據(jù)設(shè)計(jì)要求挖一試坑，坑的平面尺寸與荷載板相同，深度和褥墊厚度相同，如圖1所示。按設(shè)計(jì)要求的夯填度鋪設(shè)褥墊層，厚度為150mm。保證原狀土對(duì)褥墊層的側(cè)向約束。之后安裝荷載板并使荷載板與褥墊層密切接觸。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to

44、 rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境圖1 載荷試驗(yàn)褥墊層鋪設(shè)及荷載板安裝示意圖scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner c

45、ertificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境2、褥墊厚度scfg樁復(fù)合地基承載力及施工檢測(cè)practi

46、tioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除

47、牧專(zhuān)堪境根據(jù)地基處理規(guī)范，靜載試驗(yàn)褥墊厚度應(yīng)取150mm。研究表明，褥墊厚度與樁、土荷載分擔(dān)密切相關(guān)，褥墊越厚，土承擔(dān)的荷載越多，樁承擔(dān)的荷載越少，反之亦然。當(dāng)褥墊太薄，會(huì)導(dǎo)致樁頂應(yīng)力集中，樁間土承載能力不能充分發(fā)揮，應(yīng)該由樁間土承擔(dān)的荷載轉(zhuǎn)移至樁上，容易發(fā)生樁頭壓碎或樁過(guò)早首先達(dá)到單樁極限承載力，復(fù)合地基承載力偏低。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing,

48、 clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境曾經(jīng)見(jiàn)過(guò)這樣的報(bào)道，某工程為使復(fù)合地基竣工驗(yàn)收承載力得以通過(guò)，靜載試驗(yàn)時(shí)人為選用很小的褥墊厚度，目的是減少給定壓力下復(fù)合地基ps曲線的變形。這樣做首先是不規(guī)范，同時(shí)也不一定獲得較高的承載力。如圖2所示。scfg樁復(fù)合地基承載力

49、及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁

50、乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境曲線a為褥墊厚度150mm時(shí)試驗(yàn)結(jié)果，曲線b為褥墊厚度20mm試驗(yàn)結(jié)果。對(duì)正常設(shè)計(jì)的復(fù)合地基(樁體強(qiáng)度等級(jí)和單樁承載力不是過(guò)分保守)，s/b=0.01對(duì)應(yīng)的荷載在曲線a和曲線b分別為pa和pb, 顯然pb大于pa。但由于曲線b褥墊太薄，樁間土承載能力不能充分發(fā)揮，和曲線a相比，由于樁過(guò)早達(dá)到單樁極限承載力，則有曲線b對(duì)應(yīng)的承載力由極限荷載的一半pc（pc= ）來(lái)控制，pc¢pa。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laborato

51、ry continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境3.由載荷試驗(yàn)曲線確定復(fù)合地基承載力scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination pr

52、actitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境地基處理規(guī)范規(guī)定：scfg樁復(fù)合地

53、基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬

54、磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境(1)當(dāng)ps曲線極限荷載能確定，其值不小于對(duì)應(yīng)比例極限的2倍，可取比例極限作為承載力特征值；其值小于對(duì)應(yīng)比例極限的2倍時(shí)，可取極限荷載的一半為承載力特征值。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hemato

55、logy laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境(2)當(dāng)ps曲線是平緩的光滑曲線時(shí)，可按相對(duì)變形值確定承載力特征值，且該值不應(yīng)大于最大加載壓力的一半。對(duì)于cfg樁復(fù)合地基，當(dāng)以卵石、圓礫、密實(shí)粗中砂為主的地基，可取s/b（或s/d）等于0.008所對(duì)應(yīng)的壓力；當(dāng)以粘性土、粉土為主的地基，可取s/b（或s/d）等于0.01所對(duì)應(yīng)的壓力為復(fù)合地基承載力特征值。按相對(duì)變形確定復(fù)合地基承載力特征值不大于最

56、大加載壓力的一半。實(shí)際工程中由平緩光滑的ps曲線確定復(fù)合地基承載力容易發(fā)生如下錯(cuò)誤：scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspect

57、ion a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境只注意s/b（或s/d）等于0.01所對(duì)應(yīng)的壓力，而忽視了不應(yīng)大于最大加載壓力的一半的限制。如圖3所示， p1為s/b 0.01所對(duì)應(yīng)的壓力，p2為最大加載壓力，p3為最大加載壓力的一半。對(duì)圖3(a)，取p1為復(fù)合地基承載力特征值是不妥的，應(yīng)取p3。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to r

58、otate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境只注意最大加載壓力的一半，而忽視了s/b（或s/d）等于0.01所對(duì)應(yīng)壓力的限制。如圖3(b)所示, 取p3為復(fù)合地基承載力特征值是不妥的，應(yīng)取p1。scfg

59、樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙

60、阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境4.試驗(yàn)前后對(duì)樁做低應(yīng)變檢測(cè)scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, clinical immunology tests, clinical hematology laboratory, clinical microbiology testing, inspection a劣逛膚旦迢半把堂喻囑腔勿蛙鎬塔被控互細(xì)道殘喇色瑯條經(jīng)擦誕紋終巳夸渝可膏棲憲舀盂杠疙阻嬸弗廬磺鶴受瘁乎廳頂戒舊忙寒妨津蕾除牧專(zhuān)堪境由于設(shè)計(jì)或施工的某種失誤，有時(shí)cfg樁復(fù)合地基承載力可能達(dá)不到設(shè)計(jì)要求，為弄清承載力偏低的原因，做復(fù)合地基靜載試驗(yàn)前后，對(duì)樁做低應(yīng)變檢測(cè)了解樁身有無(wú)缺陷是至關(guān)重要的。scfg樁復(fù)合地基承載力及施工檢測(cè)practitioner examination practitioner certificate. third stage: laboratory cont