桩基础计算书
1.基础持力层:
中风化白云岩
2.地基承载力特征值:fa=2000KPa3.桩身混凝土强度等级fc=14.3N/mm²C30
4.计算公式：根据《贵州省建筑地基基础设计规范》DB22/45-2004第8.5.8及8.5.9条
1)桩身承载力Q=ψc*A*fc2)桩端承载力Ra=qpa*Ap式中 A—桩身横截面面积 A=1/4*π*D²（D为桩身直径）
Ap—桩端扩底面积 Ap=1/4*π*d²（d为扩底直径） ψc—工作条件系数ψc=0.8
5.计算过程见下表：
表一：圆桩计算表桩身尺寸扩大头尺寸桩身承载力直径D(mm)面积A(mm²)扩大b(mm)直径d(mm)面积Ap(m²)Q(kN)90063585015012001.1304007274.190063585030015001.7662507274.190063585050019002.8338507274.114001538600014001.53860017601.61400153860025019002.83385017601.61400153860010016002.00960017601.6002505000.1962500.00060012001.1304000.000000.0000000.0001002000.0314000.0002004000.1256000.0002505000.1962500.0003006000.2826000.000000.0000000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0004008000.5024000.0桩端承载力Ra(kN)2260.83532.55667.73077.25667.74019.2392.52260.80.062.8251.2392.5565.20.01004.81004.81004.81004.81004.81004.81004.81004.81004.81004.81004.81004.8桩身配筋Asmin1271.71271.71271.73077.23077.23077.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0ZJ-1ZJ-2ZJ-3ZJ-4ZJ-5ZJ-6