基坑支护设计手册设计参数.docx

1、基坑支护设计手册设计参数第一章 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、砼强度设计值（N/mm2）强度种类符

2、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C7.5C10C15C20C25C30C35C40C45C50C

3、55C60C65C70C75C80EC1.451.752.202.552.803.003.153.253.353.453.553.603.653.703.753.80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强度标准值 fy抗拉强度设计值 Fy 抗压

4、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）2.05钢绞线1.95四、钢绞线公称

5、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/m）2.50.0490.03919

6、2.8352.23030.0710.055203.1422.46640.1260.099213.4642.72050.1960.154223.8012.98460.2830.222234.1553.26070.3850.302244.5243.55180.5030.395254.9093.8590.6350.499265.3094.17100.7850.617275.7264.495110.9500.750286.1534.83121.1310.888307.0695.55131.3271.040328.0436.31141.5391.208349.0797.13151.7671.390359

7、.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2801001635.75201702132.66231902730.513153002729.714303602225.120104802323.821205102624.02

8、6407402128.025707602529.532108602726.7419011602327.6二、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 / fcu42761.433450012554821.367090014764931.065360010975360.866620012386941.008360012099181.14117700128109701.001169001201111641.281369001181213991.001750001251314361.141865001301419421.072942

9、001521525131.203306001311630360.904743001561734501.004207001211835180.80541200153三、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粘土47.417.401.291.

10、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30mm0.00

11、15H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1.41.5三、支护结构基底摩擦系数支护结构基底摩擦系数（广东省

12、规范DBJ/T15-20-97）序号土的类别摩擦系数（）序号土的类别摩擦系数（）1淤泥0.106粉、细砂0.30.42淤泥质土0.157中、粗砂0.43软塑可塑粘土0.200.258碎石土0.54硬塑坚硬粘土0.39软质岩0.40.65粉土0.30.410硬质岩0.60.7四、岩土与锚固体间的粘结强度岩土与锚固体间的粘结强度极限值qs(Kpa)序号岩土种类土的状态JGJ120-99DBJ/T15-20-97CECS22:90地基CECS96:97土钉锚杆土钉锚杆1填 土1620162030602淤 泥101610163淤泥质土1620162020254粘性土IL1183018305软塑0.75

13、IL130403040304015306可塑0.5IL0.7540534053405030507硬塑0.25IL0.553655365506050708坚硬0.0IL0.2565736573607070909IL07380738010粉 土e0.902244204010015050100110.75e0.904464406012e0.7564100609013粉细砂稍密2242204014中密4263406015密实6385608016中 砂松散17稍密5474406018中密7490607019密实90120709020粗 砂松散901407090稍密90130609016020090120

14、21中密1301709012022025012016022密实17022012015027040016020023砾 砂中密、密实19026013016024泥岩、页岩微风化岩、M30砂浆11020025白云岩、石灰岩、泥质砂岩微风化岩、M30砂浆33026砂岩、花岗岩、大理岩微风化岩、M30砂浆500五、锚管、锚杆水平刚度系数锚管水平刚度系数表（KN/m）钢管规格面积(mm2)每米重量（kg）长 度 (m)6789101112131415483.00424.1203.33228371957417127152251370212456114181054097879134483.25456.674

15、3.592459021077184421639314754134121229511349105389836603.25579.1344.5531184267292338820789187101700915592143931336512474603.50620.9354.8333435286592507622290200611823716717154321432913374603.75662.3445.2035665305702674823776213991945317832164611528514266604.00703.3605.5237873324632840525249227242065

16、818937174801623115149604.50784.2156.1642227361953167028151253362303321113194891809716891锚管水平刚度系数表（KN/m）钢管规格面积(mm2)每米重量（kg）长 度 (m)16171819202122232425483.00424.1203.338564806076127212685165256228595757095481483.25456.6743.599221867981967765737770256706641561475902603.25579.1344.5511694110061039598489

17、35589108505813577967484603.50620.9354.84125381180111145105581003095539119872283598024603.75662.3445.201337412588118881126310699101909727930489168560604.00703.3605.5214202133671262411960113621082110329988094689090604.50784.2156.1615835149041407613335126681206511516110161055710134钢绞线水平刚度系数表（Km/m）钢绞线面积

18、（mm2）每延米总重量（kg）长 度 （m）15182022252830323538402索2862.25661847674290390034323065286026812451225821453索4293.375992771506435585054184596429040223677338732174索5724.501323695338580780068646129572053624902451642905索7155.62516545119171072597508580766171506703612956455362六、圆桩配筋表单边配筋时截面容许弯矩设计值M (KNm)4005006007

19、008009001000120041673974189012142010814618522326129833641151810914852013017942222126731335840449552215221242527833839845751763462015121026832638344049761062217524731838845852759673362521030539848958067075993772024082026834742450157765380572228182231340950459769078296672534482538150763075287399312311

20、020_5186157118069961022_61373184796311941025_7629161068121915181220_72584195611851222_8591000114014181225_10711255143817991420_968110213701422_1148131216371425_164920721620_124615521622_147918531625_23401820_17321822_20641825_26022020_1909系 数C250.970.980.980.980.980.98as600.980.980.980.990.990.990.9fcm0.970.970.980.990.990.99均匀配筋时截面容许弯矩设计值M (KNm)4005006007008009001000120081681882082282510181020102210251220122212251420142