獨(dú)立基礎(chǔ)沉降計(jì)算書(shū)

1、獨(dú)立基礎(chǔ)沉降計(jì)算書(shū)一、設(shè)計(jì)資料1.工程信息 工程名稱(chēng): 成品車(chē)間勘察報(bào)告: 江蘇常州地質(zhì)工程勘察院（2014）基礎(chǔ)編號(hào): j-32.基礎(chǔ)參數(shù) 基礎(chǔ)尺寸: b l = 3.00 m 3.00 m基礎(chǔ)埋深: d = 1.500 m荷載: fk = 730.00 kn鉆孔編號(hào): zk01孔囗標(biāo)高: 0.00m地下水位標(biāo)高: -1.00m地下水位深度: 1.00 m地基承載力特征值: fak = 240.00 kpa3.計(jì)算參數(shù)設(shè)計(jì)時(shí)執(zhí)行的規(guī)范: 建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范（gb 500072002）以下簡(jiǎn)稱(chēng) 基礎(chǔ)規(guī)范沉降計(jì)算經(jīng)驗(yàn)系數(shù): 程序自動(dòng)地基變形計(jì)算深度: 按基礎(chǔ)規(guī)范式5.3.6計(jì)算4.地質(zhì)參數(shù)地質(zhì)

2、資料參數(shù)表序號(hào)土層名稱(chēng)厚度(m)標(biāo)高(m)深度(m)重度kn/m3模量es1粘土3.65-3.653.6519.808.002粉土3.00-6.656.6518.808.503粉質(zhì)粘土8.00-14.6514.6518.704.50二、計(jì)算步驟1.計(jì)算基礎(chǔ)底面的附加壓力基礎(chǔ)自重和其上的土重為: gk = ggad-gwadw = 20 3.00 3.00 1.50- 10 3.00 3.00 0.50 = 225.00 kn基礎(chǔ)底面平均壓力為: pk = 106.11 kpa基礎(chǔ)底面自重壓力為: sch = gmd = 16.47 1.50 = 24.70 kpa上式中 gm為基底標(biāo)高以上天然

3、土層的加權(quán)平均重度，其中地下水位下的重度取浮重度 gm = = 16.47 kn/m3基礎(chǔ)底面的附加壓力為: p0 = pk - sch = 106.11 - 24.70 = 81.41 kpa2.確定分層厚度按基礎(chǔ)規(guī)范表5.3.6: 由b = 3.00m得dz = 0.60m3.確定沉降計(jì)算深度按基礎(chǔ)規(guī)范式(5.3.6)確定沉降計(jì)算深度. zn = 8.40 m4.計(jì)算分層沉降量根據(jù)基礎(chǔ)規(guī)范表 k.0.1-2可得到平均附加應(yīng)力系數(shù)，計(jì)算的分層沉降值見(jiàn)下表: 基礎(chǔ)規(guī)范的分層總和法沉降計(jì)算表z(m)l1/b1z/b1azaziai - zi-1ai-1esi(mpa)dsi = p0/esi(z

4、iai - zi-1ai-1)dsi(mm)01.00040.25=1.000 2.151.001.4340.2027 = 0.81061.74281.74288.0017.7417.745.151.003.4340.1247 = 0.49892.56910.82638.507.9125.657.801.005.2040.0906 = 0.36242.82710.25804.504.6730.328.401.005.6040.0852 = 0.34102.86430.03724.500.6730.99上表中l(wèi)1 = l/2 = 1.50mb1 = b/2 = 1.50mz = 8.40m范圍內(nèi)

5、的計(jì)算沉降量ds = 30.99 mm, z = 7.80m至8.40m(dz為0.60m)土層計(jì)算沉降量dsi = 0.67 = si = 0.67 mm 0.025dsi = 0.025 30.99 = 0.77 mm，滿(mǎn)足要求。5.確定沉降計(jì)算經(jīng)驗(yàn)系數(shù)ys由沉降計(jì)算深度范圍內(nèi)壓縮模量的當(dāng)量值es可從基礎(chǔ)規(guī)范表5.3.5查得ys系數(shù)es = ai = p0(ziai - zi-1ai-1)式中ai為第i層土附加應(yīng)力系數(shù)沿土層厚度的積分值ai = p0 2.86 = 2.86p0p0 (+ + + )= p0 (0.22 + 0.10 + 0.06 + 0.01)= 0.38p0es = 7.52 mpap0 = 81.41 kpa 0.75fak = 0.75 240.00 = 180.00 kpa查基礎(chǔ)規(guī)范表5.3