樁基承載力計(jì)算

1、第一個(gè)算例－樁基承載力及沉降計(jì)算第一個(gè)算例－樁基承載力及沉降計(jì)算算例簡(jiǎn)圖算例簡(jiǎn)圖(規(guī)范樁基例題規(guī)范樁基例題)工程地質(zhì)地層參數(shù)工程地質(zhì)地層參數(shù)層號(hào)厚度(m)容重(kNm3)Es(Mpa)fi(kPa)fp(kPa)c(kPa)Φ()11.0018.0.15....23.2018.50.15....34.0017.40.15....414.0017.30.22.400...58.0018.76.227.5700...65.0019.16.4

2、5.4000...78.0019.25.50.5000...單樁豎向承載力設(shè)計(jì)值計(jì)算單樁豎向承載力設(shè)計(jì)值計(jì)算本工程采用C30級(jí)，φ.6米22米混凝土灌注樁，樁周長(zhǎng)為1.88米，截面積為.28平方米；1.1.按規(guī)范第按規(guī)范第6.2.66.2.6條按樁身結(jié)構(gòu)強(qiáng)度確定樁豎向承載力設(shè)計(jì)值：條按樁身結(jié)構(gòu)強(qiáng)度確定樁豎向承載力設(shè)計(jì)值：灌注樁：Rd≤0.60fcAp=2544.69kN；2.2.按規(guī)范第按規(guī)范第6.2.46.2.4條按地基土對(duì)樁的支承力

3、確定樁豎向承載力設(shè)計(jì)值：條按地基土對(duì)樁的支承力確定樁豎向承載力設(shè)計(jì)值：樁側(cè)總極限摩阻力標(biāo)準(zhǔn)值：Rsk=UpΣfsilI=830.32kN；樁端極限阻力標(biāo)準(zhǔn)值：三、三、最終沉降量計(jì)算：最終沉降量計(jì)算：1計(jì)算點(diǎn)座標(biāo)(默認(rèn)值為群樁形心，AutoCAD－WCS座標(biāo)系，否則為用戶(hù)指定)：Xc=45312.29，Yc=57120.9；2單樁沉降計(jì)算Q取準(zhǔn)永久值效應(yīng)作用下的單樁平均附加荷載(計(jì)入單樁Gpk)：經(jīng)計(jì)算群樁頂部附加荷載準(zhǔn)永久值效應(yīng)組合值F

4、l=78950.39kN；故Q=FlnGpk=78950.3918193.31=529.5kN；3壓縮層厚度計(jì)算：按Mindlin解，考慮樁側(cè)摩阻力為線性增加(Geddes積分解)模式：⑴地基中應(yīng)力計(jì)算一覽表：應(yīng)力計(jì)算式：樁尖以下深度z(m)土中附加應(yīng)力(kPa)自重應(yīng)力(kPa)應(yīng)力比.0175.75182.700.9621.081.65191.400.4272.065.99200.100.3303.063.48208.800.304