各巖土層的空間分布及主要特征一覽表勘察報(bào)告

巖土名層頂巖土名層頂層頂層埋深標(biāo)高層厚號(hào)〔m〕〔m〕顏色狀態(tài)包含物及特征〔m〕性雜填土0.0021.23?26.300.6~4.6雜色松散狀高褐色，中等。大局部地段有分布?；疑?、流-狀〔?〕中濕高含少量鐵錳質(zhì)氧化物及云母片，光澤反應(yīng)為稍有光滑，無(wú)搖振反響，干強(qiáng)度較低，局部為流塑狀淤泥質(zhì)粉質(zhì)粘土，局部夾薄層稍密-中密狀粉砂及可塑狀粉質(zhì)粘土，土質(zhì)均勻性較差。全場(chǎng)均有分布。含云母碎片、石英、長(zhǎng)石等，大局部地段夾流?軟塑狀〔稍密?中密狀〕④ 青灰色中密?中偏實(shí) 低層淤泥質(zhì)粉質(zhì)粘土夾粉土透鏡體〔云母片及腐植質(zhì)，有腥臭味，無(wú)光澤反響，搖震反響中等，干強(qiáng)度低〕 ，局部夾薄層可塑狀粉質(zhì)粘土，土質(zhì)均勻性較差。全場(chǎng)均有分布。密實(shí)飽和含云母碎片、石英、長(zhǎng)石等，粘粒含量低 少，分選性良好。全場(chǎng)均有分布。物成份為石英、長(zhǎng)石及燧石等，直徑Qal+pl50.3?58.4-35.28?-25.510.5~5.5灰白紅色，密實(shí)低20~130mm20mm勺顆60%磨圓度較好，其充填物主要為密實(shí)狀粉細(xì)砂。全場(chǎng)均有分布。強(qiáng)風(fēng)化粉砂質(zhì)構(gòu)造，泥質(zhì)膠結(jié)，節(jié)理裂隙發(fā)育，0.7?5.2棕紅色、灰 白色低 構(gòu)造面見(jiàn)鐵錳質(zhì)浸染，局部風(fēng)化成土狀，巖芯多呈塊狀、餅狀，少量為短柱狀。全場(chǎng)均有分布。棕紅色、灰不中風(fēng)化K露厚度7.3米白色粉砂質(zhì)構(gòu)造，泥質(zhì)膠結(jié)，節(jié)理裂隙較發(fā)育，構(gòu)造面見(jiàn)鐵錳質(zhì)浸染，巖芯呈短?可 長(zhǎng)柱狀，其平均RQD=80%巖石堅(jiān)硬程壓 度屬極軟巖，巖體完整程度屬較完整，縮 巖體根本質(zhì)量等級(jí)為V級(jí)。全場(chǎng)均有分布。粉質(zhì)粘黃褐含少量鐵錳質(zhì)氧化物，光澤反響為稍有土0.6~4.617.43?2.1?色、灰可塑狀濕中光滑，無(wú)搖振反響，干強(qiáng)度中等，韌性al粉質(zhì)粘24.8010.5土夾粉0.8?11.39?1.3?土al13.224.2535.3粉細(xì)砂7.2?-13.18?6.6~Qa36.316.3337.0細(xì)砂39.8?-26.68?8.2?青灰49.8-14.5515.6色51.5?-36.48?巖K59.6-26.61中風(fēng)化本次勘察未揭泥質(zhì)粉54.5~-40.15?穿該層，砂巖63.3-29.21最大揭、地基土〔巖〕的物理力學(xué)性質(zhì)指標(biāo)

土的物理力學(xué)性質(zhì)統(tǒng)計(jì)本次勘察對(duì)第②層粉質(zhì)粘土、第③層粉質(zhì)粘土夾粉土、第④粉細(xì)砂土及第⑤層細(xì)砂共取土樣 性質(zhì)統(tǒng)計(jì)表及砂土層顆粒分析統(tǒng)計(jì)表見(jiàn)下表4、表5。稱工程稱工程含水量W%自然重度rkN/m孔隙比eW%塑限Wp%數(shù)3IILP數(shù)a1-2MpaEsMPa滲透系數(shù)cm/s②土土③粉土④-1 土砂土層顆粒分析統(tǒng)計(jì)表5n4545454545454545455max31.819.70.93739.022.916.20.730.498.94.1E-06min24.418.00.70930.620.210.40.330.203.96.5E-07u28.918.90.81735.321.613.70.540.365.162.06E-06a1.920.410.062.070.831.380.120.060.9180.070.020.070.060.040.100.220.170.18n383838383838383838max40.618.81.09339.823.416.41.350.644.44min30.517.40.87030.720.210.40.780.433.0u34.318.20.95535.121.613.40.950.513.86a2.110.310.051.990.731.400.150.050.3580.060.020.050.060.030.100.160.100.09n181818181818181818max34.119.40.98935.421.813.61.590.498.9min26.417.80.72426.217.98.20.850.23.9u30.418.60.8582919.39.71.160.365.6a2.590.460.082.741.011.780.240.091.5580.090.020.090.090.050.180.210.260.28n363636363636363636max39.818.61.17437.422.4151.730.694.6min30.016.80.88029.219.59.70.770.413.1u35.017.71.00933.721.212.51.110.533.86a2.750.450.071.720.571.250.290.070.3780.080.030.070.050.030.100.260.130.10顆粒分析％〔伽〕層顆粒分析％〔伽〕層號(hào)巖土工程名稱粉細(xì)砂細(xì)砂20?22?0.50.5?0.250.25?0.075V0.075n43176113113max5.415.223.490.448min1.91.11.645.35.1u3.65.38.664.318.2n334616868max5.114.725.892.241.3min2.51.11.355.93.8u3.66.99.768.211.6maxminu45maxminu45845.80.910.160.965.553623.91.070.270.943.7本次勘察對(duì)土試樣進(jìn)展了直接快剪試驗(yàn)，其抗剪強(qiáng)度指標(biāo) 統(tǒng)計(jì)詳見(jiàn)下表6抗剪強(qiáng)度指標(biāo)統(tǒng)計(jì)表 表62.3.3標(biāo)準(zhǔn)貫入試驗(yàn)錘擊數(shù)統(tǒng)計(jì)

砂及第⑤層細(xì)砂分別進(jìn)展了標(biāo)準(zhǔn)貫入試驗(yàn)，標(biāo)準(zhǔn)貫入試驗(yàn)錘擊數(shù)統(tǒng)計(jì)表

其標(biāo)貫錘擊數(shù)統(tǒng)計(jì)見(jiàn)下表77地層編號(hào)巖土名稱統(tǒng)計(jì)次數(shù)根本值〔T地層編號(hào)巖土名稱統(tǒng)計(jì)次數(shù)根本值〔T變異系統(tǒng)計(jì)修正系數(shù)數(shù)標(biāo)準(zhǔn)值N②粉質(zhì)粘土粉質(zhì)粘土③粉質(zhì)粘土夾粉土粉土④-1 淤泥質(zhì)粉質(zhì)粘土夾粉土④粉細(xì)砂⑤細(xì)砂號(hào)巖土名稱指標(biāo)統(tǒng)計(jì)次數(shù)n根本值標(biāo)準(zhǔn)差變異系統(tǒng)計(jì)修正系數(shù) 數(shù)標(biāo)準(zhǔn)值maxminu②粉質(zhì)粘土粉質(zhì)粘土K③粉土K④-1粉土K4115710.62.300.220.941021634.60.680.150.944.3116331725.84.980.190.972573453339.82.950.070.9939.2

〕3.5C<(kPaC<(kPa)43421524.46.120.250.9322.70 (°)K4314.89.312.60.970.080.9812.3C<(kPa)3018611.73.410.290.9110.60 (°)3212.44.29.372.360..250.928.6C<(kPa)1319814.63.250.220.9013.10 (°)1319.610.215.32.820.180.9113.9C<(kPa)211569.92.890.290.898.80 (°)21124.28.32.010.240.917.6重型動(dòng)力觸探試驗(yàn)錘擊數(shù)統(tǒng)計(jì)表N

地層編號(hào)根本值〔擊〕地層編號(hào)根本值〔擊〕標(biāo)準(zhǔn)差變異系數(shù)孔號(hào)及巖土名統(tǒng)計(jì)孔數(shù)稱nmaxmin□〔T系數(shù)￥標(biāo)準(zhǔn)值N63.5〔擊〕B4B17B26B65B106B1408872827:2617181821.82321.6

〕 8B46B46B58⑥卵石6331623.87291722.182816218261620.55261621167178⑥卵石B6167178⑥卵石B622375256741161561891938252022.8⑦層強(qiáng)粉砂巖強(qiáng)風(fēng)化泥質(zhì)粉砂巖72317208352529.51029.520.022.4r2.73 :0.120.9320.86322527.582820237252023.17332528.47282082820237252023.17332528.47282023.9829212572819247r302427.172820241028.422.824.92.0400.80.9523.7靜力觸探比貫入阻力 Ps值統(tǒng)計(jì)本次勘察對(duì)第②層粉質(zhì)粘土、第③層粉質(zhì)粘土夾粉土、第④層粉細(xì)

規(guī)定，場(chǎng)地環(huán)境地質(zhì)條件為潮濕區(qū)強(qiáng)透水層中的地下水，故擬建場(chǎng)地環(huán)境類型應(yīng)屬H 類。4、場(chǎng)地地震效應(yīng)、抗震設(shè)防按“中國(guó)地震驚參數(shù)區(qū)劃圖”，武漢地區(qū)地震根本烈度為 6度，設(shè)計(jì)根本地震加速度值為 0.05g，設(shè)計(jì)地震分組為第一組，擬建建筑物可砂進(jìn)展了靜力觸探試驗(yàn)，其比貫入阻力 Ps值統(tǒng)計(jì)見(jiàn)下表9根本值編號(hào)巖土名稱數(shù)maxmin□標(biāo)準(zhǔn)差根本值編號(hào)巖土名稱數(shù)maxmin□標(biāo)準(zhǔn)差數(shù)統(tǒng)計(jì)修正系數(shù)標(biāo)準(zhǔn)值Ps②粉質(zhì)粘土③ 粉土粉土:42621.441.020.90 r1.140.66 0.80-1 淤泥質(zhì)粉質(zhì)粘土夾粉土④ 粉細(xì)砂〔T(MPa)0.130.110.971.100.150.210.970.70624.68624.681.372.860.680.240.942.69423.371.442.170.400.180.952.066213.327.6710.111.380.140.979.81本次勘察對(duì)第⑦層強(qiáng)風(fēng)化泥質(zhì)粉砂巖及第⑧層中風(fēng)化泥質(zhì)粉砂巖共

6度進(jìn)展抗震設(shè)防，抗震設(shè)防類別屬標(biāo)準(zhǔn)設(shè)防類。經(jīng)查閱“武漢市主城規(guī)劃區(qū)地震驚參數(shù)小區(qū)規(guī)劃圖” ，本擬建場(chǎng)地IIIA區(qū)。、場(chǎng)地土類型及建筑場(chǎng)地類別依據(jù)湖北省地方標(biāo)準(zhǔn)《建筑地基根底技術(shù)標(biāo)準(zhǔn)》 2023〕取巖樣42件，其巖石自然單軸抗壓強(qiáng)度統(tǒng)計(jì)見(jiàn)下表 10。

有關(guān)規(guī)定，結(jié)合標(biāo)準(zhǔn)貫入試驗(yàn)錘擊數(shù)及靜力觸探比貫入阻力 Ps值，巖石自然單軸抗壓強(qiáng)度統(tǒng)計(jì)表 表10

利用Vse=do/tt=

di/Vsi計(jì)算土層的等效剪切波速見(jiàn)下表 11。層編號(hào)統(tǒng)計(jì)次根本值巖土名稱層編號(hào)統(tǒng)計(jì)次根本值巖土名稱試驗(yàn)狀態(tài)數(shù)n標(biāo)準(zhǔn)差maxminf統(tǒng)計(jì)修正系標(biāo)準(zhǔn)值frk數(shù) MParm〔T⑦ 粉砂巖⑧ 粉砂巖n場(chǎng)地土層等效剪切波速估算表 表11自然110.600.260.420.120.290.840.35自然283.571.262.550.720.280.912.32層號(hào)及巖土名稱剪切波速V>層號(hào)及巖土名稱剪切波速V>〔m/s〕i①雜填土②粉質(zhì)粘土質(zhì)粘土互層140185155K16K30K33K64K83K105K111.01.01.02.71.81.41.4.86.610.59.37.6//6.21.65.28.02.918.610.④粉細(xì)砂計(jì)算深度〔m〕④粉細(xì)砂計(jì)算深度〔m〕單孔Vse(m/s)號(hào)及巖土名稱 剪切波速V>〔m/s〕i①雜填土 140粉質(zhì)粘土質(zhì)粘土互層④粉細(xì)砂計(jì)算深度〔m〕單孔Vse(m/S)場(chǎng)地Vse平均值〔m/s〕182.32708.010.83.3/7.7/7.920.020.020.020.020.020.020.0194.7214.7194.7214.7182.4165.1197.7153.8184.2K131K147K154K166K170K173K1752.01.52.11.21.52.41.2185//3.9185//3.95.46.86.78.115513.412.53.513.411.75.92.32704.66.010.5//5.08.420.020.020.020.020.020.020.0169.8176.1205.0161.0162.7181.9203.4可視為較穩(wěn)定的建筑場(chǎng)地，適宜進(jìn)展建筑。本次勘察在K47、K60、K139、K199等4個(gè)鉆孔內(nèi)進(jìn)展了剪切波速、地基均勻性評(píng)價(jià)和地面微動(dòng)測(cè)試〔詳見(jiàn)附件剪切波速及地脈動(dòng)測(cè)試報(bào)告〕 ，測(cè)試結(jié)果依據(jù)本次勘察結(jié)果，本場(chǎng)地各地層在水平方向分布上有確定的變化，為：存在著缺失與尖滅現(xiàn)象，局部地段層面坡度大于 0?20m深度范圍內(nèi)掩蓋土層等效剪切波速為 141.0?210.1m/s，場(chǎng)地、地基土〔巖〕承載力特征值及壓縮模量覆各巖土層承載力及壓縮模量通過(guò)土〔巖〕工試驗(yàn)、標(biāo)準(zhǔn)貫入試驗(yàn)、蓋層厚度為54.50?63.30m類建筑場(chǎng)地，為建筑抗震一般地段。依據(jù)地面微動(dòng)測(cè)試報(bào)告，本場(chǎng)地水平向平均卓越周期值為：0.375s;

12。

承載力特征值及壓縮模量綜合成果表 表12土工試驗(yàn)標(biāo)準(zhǔn)貫入試驗(yàn)重型動(dòng)力觸探試驗(yàn)靜力觸探試驗(yàn)綜合建議值土工試驗(yàn)標(biāo)準(zhǔn)貫入試驗(yàn)重型動(dòng)力觸探試驗(yàn)靜力觸探試驗(yàn)綜合建議值層號(hào)巖土名稱fakEsfakEsfakE)fakEsfakE②粉質(zhì)粘③④-1④j⑤⑥土土⑦強(qiáng)風(fēng)化泥巖////300(f)42.0強(qiáng)度30042af =0.35MPa(f)a(Erk⑧中風(fēng)化泥巖巖石自然單軸抗壓強(qiáng)度 ff =2.32MPrkrk=2.32MPaf=800kPaakPaMPakPaMPakPaMPakPaMPakPaM1705.21308.5//1105.51105.803.9955.0//804.0804.753.91056.0//1108.0955.粉細(xì)砂//230121.0//24522.023021細(xì)砂粉細(xì)砂//230121.0//24522.023021細(xì)砂//29027.0////29027卵石////80053.0//600365.4、地基土〔巖〕工程特征分析與評(píng)價(jià)622樁基設(shè)計(jì)參數(shù)建議

樁基設(shè)計(jì)參數(shù)建議選用見(jiàn)表 14。

表14 建議進(jìn)入持力層的深度以壓樁力把握為主，設(shè)計(jì)樁長(zhǎng)把握為輔。地層編號(hào)及

鉆〔沖〕孔灌注樁 預(yù)應(yīng)力管樁q樁端土的端阻力特征值qpa樁周土的摩阻力特樁端土的端阻力特征值 預(yù)應(yīng)力管樁屬擠土型樁