软土地基减沉复合疏桩基础桩形状:圆形桩直径d或边长b:0.6m桩面积Ap:0.283m2基桩竖向承载力特征值Ra:2400KNFk:3100KNGk:1340KN承台面积控制系数ξ:0.80承台底地基承载力特征值fak:80Kpa桩基土承台效应系数ηc:0.4有利水浮力700KN桩数计算桩基承台总净面积Ac:44.40m2基桩数n:1根沉降计算实际配桩数n:1根实际承台长度L:4.2m实际承台宽度B:4.2m承台总面积A:17.64m2承台实际净面积Ac:17.36m2承台等效宽度Bc:4.17m基桩刺入变形影响系数ηp:1荷载效应准永久值组合下,作用于承台底的总附加荷载F:2500KN按荷载效应准永久组合计算的假想天然地基平均附加应力P0:6Kpa桩身等效直径d:0.6m桩间距Sa:8.4m等效距径比Sa/d:14平均桩侧极限摩阻力qsu:13.6Kpa平均压缩模量Es:2.7Mpa桩土相互作用产生的沉降Ssp:4.30mm承台底地基土附加压力作用下中点沉降Ss:15.22mm沉降计算经验系数ψ:1桩基中心点沉降量S:19.51mm(考虑到桩基中点沉降量最大,而跨中沉降存在滞后;因此计算沉降时,桩筏面积按柱跨的1/2围合面积(即AC)计算)紫色为输入栏,白色为输出栏土层沉降计算表格Z34孔估算编号承台底土层名称桩侧摩阻力qsu(Kpa)Esi(Mpa)土层深度zi(m)土层厚度li(m)qsuli土重度(KN/m3)00000002-1淤泥51.895.835.8329.156.52-2淤泥质粉质粘土62.294.2-1.63-9.7862-3粉质粘土104.255.10.9963-1粉质粘土225.858.93.883.693-2粉质粘土174.386.8-2.1-35.7114-2粉质粘土204.979.32.5509sum40.139.3126.27附加应力σz:3.92Mpa自重应力0.1σc:9.77Mpa判断:OK平均压缩模量Es:2.7Mpa平均摩阻力qsu:13.6Kpa(考虑到桩基中点沉降量最大,而跨中沉降存在滞后;因此计算沉降时,桩筏面积按柱跨的1/2围合面积(即AC)计算)长宽比a/b深宽比zi/Bc角点平均附加应力系数αiziαiziαi-zi-1αi-1(ziαi-zi-1αi-1)/EsAi000.25000.0000.0000.0000.0001.001.400.24801.4461.4460.7651.4461.001.010.24301.021(0.425)(0.186)(0.396)1.001.220.23501.1990.1780.0420.2121.002.140.21201.8870.6880.1180.8061.001.630.18501.258(0.629)(0.144)(0.389)1.002.230.17001.5810.3230.0650.4250.17000.6602.103Ai/Esiσc(Mpa)0.000300.76567.895(0.173)58.1150.05063.5150.13897.715(0.089)74.6150.08697.1150.77697.715