1、基坑支护工程设计常用指标参数基坑、支护工程设计常用指标参数第一章 砼钢材的物理力学性质指标摘自混凝土结构设计规范GB 50010-2002。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
2、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C7.5C10C15C20C2
3、5C30C35C40C45C50C55C60C65C70C75C80EC1.451.752.202.552.803.003.153.253.353.453.553.603.653.703.753.80说明:C7.5、C10砼的力学指标摘自GBJ 10-89。第二节 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HPB 235(Q235)235210210HRB 335(20MnSi)335300300HRB 400(20MnSiV、20MnSiNb、20MnTi)O400360360RRB 400(K20MnSi) OR400360360注:Fyk强度标准
4、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FptkFpyFpy钢绞线13s186013203901720122015701110171860132039017201220消除应力钢丝光 面螺旋肋pH177012504101670118015701110刻 痕I15701110410热处理钢 筋40Si2MnHT1470104040048Si2Mn45SiCr三、钢筋弹性模量(105N/mm2)种 类EsHPB 235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
5、.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)1138.637.40.29810.859.30.46512.985.40.6712179.554.80.43211.174.20.58012.798.70.77415.2139.01.101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15.2mm钢绞线的实测截面积为140mm2,每延米重量为1.125 kg/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/
6、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.
7、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(0)直剪快剪3151332342.262316126.525.811242713124.113152893222.0三轴不排水剪2801001635.75201702132.66231902730.513153002729.714303602225.12010480232
8、3.821205102624.026407402128.025707602529.532108602726.7419011602327.6二、水泥土的变形模量试件编号无侧限抗压强度fcu (KPa)破坏时应变f (%)变形模量E50 (KPa)E50 / fcu42761.433450012554821.367090014764931.065360010975360.866620012386941.008360012099181.14117700128109701.001169001201111641.281369001181213991.001750001251314361.14186500
9、1301419421.072942001521525131.203306001311630360.904743001561734501.004207001211835180.80541200153三、水泥土抗压强度土的性质水泥土试验结果成因土名含水量W(%)容重(KN/m3)孔隙比e液性指数IL塑性指数Ip水泥标号掺入量(%)龄期(d)抗压强度(KPa)滨海相淤泥50.017.301.391.2122.8325#10901096淤泥质亚粘土36.418.301.031.2616.4425#8901415溺谷相淤泥68.415.601.801.7121.8425#14901097三角洲相淤泥质亚
10、粘土47.417.401.291.6316.0425#10120998河漫滩相淤泥质粘 土56.016.701.311.1821.0525#1030880湖沼相泥碳土448.010.408.060.85341.0425#2590155泥碳化土58.016.301.480.6526.0425#1590714四、水泥土龄期与抗压强度的关系fcu3(0.260.50)fcu90fcu7(0.300.629)fcu90fcu28(0.60.75)fcu90第二章 基坑规范摘录一、基坑变形控制值基坑变形控制值(广东省标准DBJ/T15-20-97)安全等级基坑支护结构水平位移周围地面沉降变形备 注一级0.002H且不大于30mm0.0015H且不大于20mm二级0.004H且不大于50mm0.003H且不大于40mm三级0.025H且不大于150mm0.02H且不大于120mm二、锚杆安全系数序号安全等级临时(基坑)锚杆K永久锚杆KJGJ120-99DBJ/T15-20-97CECS22:90YB9258-97CECS22:90锚固体杆 体(设计值)锚固体杆体锚固体、杆体锚固体、杆体锚固体、杆体1一级1.7161.321.61.51.81.82.22二级1.6251.251.61.51.61.62.03三级1.4631.1251.61.51.41.41.84岩锚1.41.5
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