岩土基坑支护参数指标.doc

第一章砼钢材的物理力学性质指标摘自《混凝土结构设计规范》GB50010-2002。第一节砼的物理力学性质指标一、砼强度标准值（N/mm2）强度种类符号砼强度等级C7.5C10C15C20C25C30C35C40C45C50C55C60C65C70C75C80轴心抗压fck56.71013.416.720.123.426.829.632.435.538.541.544.547.450.2抗拉ftk0.750.91.271.541.782.012.202.392.512.642.742.852.932.993.053.11二、砼强度设计值（N/mm2）强度种类符号砼强度等级C7.5C10C15C20C25C30C35C40C45C50C55C60C65C70C75C80轴心抗压fc3.75.07.29.611.914.316.719.121.123.125.327.529.731.833.835.9抗拉ft0.550.650.911.11.271.431.571.711.81.891.962.042.092.142.182.22注:1、计算现浇砼轴心受压及偏心受压构件时,如截面的边长或直径小于300时,则表中强度设计值乘以系数0.8。三、砼弹性模量（×104N/mm2）砼强度等级C7.5C10C15C20C25C30C35C40C45C50C55C60C65C70C75C80EC1.451.752.202.552.803.003.153.253.353.453.553.603.653.703.753.80说明：C7.5、C10砼的力学指标摘自GBJ10-89。钢筋的物理力学性质指标一、普通钢筋强度标准值、设计值种类符号FykfyFy’热轧钢筋HPB235（Q235）φ235210210HRB335（20MnSi）Φ335300300HRB400（20MnSiV、20MnSiNb、20MnTi）O400360360RRB400（K20MnSi）OR400360360注：Fyk－强度标准值fy－抗拉强度设计值Fy’－抗压强度设计值二、预应力钢筋强度标准值、设计值种类符号FptkFpyF’py钢绞线1×3φs1860132039017201220157011101×71860132039017201220消除应力钢丝光面螺旋肋ΦpφH177012504101670118015701110刻痕φI15701110410热处理钢筋40Si2MnφHT1470104040048Si2Mn45SiCr三、钢筋弹性模量（×105N/mm2）种类EsHPB235级钢筋2.1HRB335级钢筋、HRB400级钢筋、RRB400级钢筋、热处理钢筋2.0消除应力钢丝（光面钢丝、螺旋肋钢丝、刻痕钢丝）2.05钢绞线1.95四、钢绞线公称直径、截面面积、理论重量序号种类公称直径（mm）公称截面面积（mm2）理论重量（kg/m）11×38.637.40.29810.859.30.46512.985.40.67121×79.554.80.43211.174.20.58012.798.70.77415.2139.01.101注：多股钢绞线截面面积和单位重量可根据实测值调整。一般情况下φ15.2mm钢绞线的实测截面积为140mm2，每延米重量为1.125kg/m。五、钢筋公称直径、截面面积、理论重量直径（mm）计算截面面积（cm2）理论质量（kg/m）直径(mm）计算截面面积（cm2）理论质量（kg/m）2.50.0490.039192.8352.23030.0710.055203.1422.46640.1260.099213.4642.72050.1960.154223.8012.98460.2830.222234.1553.26070.3850.302244.5243.55180.5030.395254.9093.8590.6350.499265.3094.17100.7850.617275.7264.495110.9500.750286.1534.83121.1310.888307.0695.55131.3271.040328.0436.31141.5391.208349.0797.13151.7671.390359.6207.50162.0111.5783610.1797.99172.2701.7804012.5619.865182.5451.998第三节水泥搅拌桩物理力学指标一、水泥土抗剪强度与抗压强度关系表试验方法无侧限抗压强度fcu(KPa)抗剪强度C/f(%)粘聚力c(KPa)内摩擦角φ（0）直剪快剪3151332342.262316126.525.811242713124.113152893222.0三轴不排水剪2801001635.7520170