1、,樁基礎(chǔ)負(fù)摩阻力計(jì)算,樁直徑,D,0.5,m,樁面積,A,0.196 ,m2,樁周長(zhǎng),u,1.571 ,m,地面超載,p,5.00 ,kpa,負(fù)摩阻力系數(shù)n,地下水標(biāo)高,-1.80 ,m,表5.4.4-1,鉆孔編號(hào),土層,層頂標(biāo)高,厚度(m),正摩阻力標(biāo)準(zhǔn)值(Kpa),重度(KN/m3),地下水重度(KN/m3),有效重度(KN/m3),負(fù)摩阻力系數(shù)n,樁周土平均有效應(yīng)力(KN/m3),負(fù)摩阻力標(biāo)準(zhǔn)值(Kpa),下拉荷載標(biāo)準(zhǔn)值(KN),土類(lèi),n,飽和軟土,0.150.25,ZK1,1 填土,3.00 ,2.62 ,50.00 ,19.40 ,10.00 ,19.40 ,0.20 ,30.41

2、,6.08 ,25.03 ,黏性土、粉土,0.250.40,2 淤泥質(zhì)粉質(zhì)粘土,0.38 ,0.00 ,50.00 ,18.20 ,10.00 ,18.20 ,0.22 ,60.83 ,13.38 ,0.00 ,砂土,0.350.50,3 中砂,0.38 ,6.30 ,50.00 ,19.90 ,10.00 ,13.36 ,0.45 ,107.91 ,48.56 ,480.56 ,自重濕陷性黃土,0.200.35,3-1淤泥,-5.92 ,0.00 ,50.00 ,16.20 ,10.00 ,6.20 ,0.22 ,155.00 ,34.10 ,0.00 ,注：1、在同一類(lèi)土中，對(duì)于擠土樁，取

3、表中較大值,4 淤泥質(zhì)粉質(zhì)粘土,-5.92 ,5.34 ,50.00 ,17.50 ,10.00 ,7.50 ,0.22 ,180.02 ,39.61 ,332.21 ,對(duì)于非擠土樁，取表中較小值,中性點(diǎn),-11.26 ,3.02 ,50.00 ,17.50 ,10.00 ,7.50 ,216.37 ,0.00 ,0.00 ,2、填土按其組成取表中同類(lèi)土的較大值,6 粉砂,-14.28 ,-14.28 ,50.00 ,17.50 ,10.00 ,7.50 ,179.15 ,0.00 ,0.00 ,130.60 ,0.00 ,0.00 ,135.60 ,0.00 ,0.00 ,中性點(diǎn)深度ln,合計(jì),837.80 ,表5.4.4-2,持力層性質(zhì),黏性土、粉土,中密以上砂,礫石、卵石,基巖,中性點(diǎn)深度比ln/l0,0.50.6,0.70.8,0.9,1注：,中性點(diǎn)深度由建筑樁基技術(shù)規(guī)范(JGJ94-2008)表5.4.4-2確定。,本表格考慮地面超載和地下水共同作用下的負(fù)摩阻力。,中性點(diǎn)深度ln應(yīng)按樁周土層沉降與樁沉降相等的條件計(jì)算確定，也可參照表5.4.4-2 確定。,注： 1 、ln 、l0 分別為自樁頂算起的中性點(diǎn)深度和樁周軟弱土層下限深度；,2、 樁穿過(guò)自重濕陷性黃土層時(shí)，ln 可按表列值增大10（持力層為基巖除外）；,3 、當(dāng)樁周土層固結(jié)與樁