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）2.50.0490.039192.8352.23030.0710.055203.1422.46640.1260.099213.4642.72050.1960.154223.8012.98460.2830.222234.1553.26070.3850.302244.5243.55180.5030.395254.9093.8590.6350.499265.3094.17100.7850.617275.7264.495110.9500.750286.1534.83121.1310.888307.0695.55131.3271.040328.0436.31141.5391.208349.0797.13151.7671.390359.6207.50162.0111.5783610.1797.99172.2701.7804012.5619.865182.5451.998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（0）直剪快剪3151332342.262316126.525.811242713124.113152893222.0三轴不排水剪2801001635.75201702132.66231902730.513153002729.714303602225.120104802323.821205102624.026407402128.025707602529.532108602726.7419011602327.6二、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 / fcu42761.433450012554821.367090014764931.065360010975360.866620012386941.008360012099181.14117700128109701.001169001201111641.281369001181213991.001750001251314361.141865001301419421.072942001521525131.203306001311630360.904743001561734501.004207001211835180.80541200153三、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1.41.5三、支护结构基底摩擦系数支护结构基底摩擦系数（广东省规范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0.75IL130403040304015306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9013060901602009012021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)6789101112131415483.00424.1203.33228371957417127152251370212456114181054097879134483.25456.6743.592459021077184421639314754134121229511349105389836603.25579.1344.5531184267292338820789187101700915592143931336512474603.50620.9354.8333435286592507622290200611823716717154321432913374603.75662.3445.2035665305702674823776213991945317832164611528514266604.00703.3605.5237873324632840525249227242065818937174801623115149604.50784.2156.1642227361953167028151253362303321113194891809716891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)16171819202122232425483.00424.1203.338564806076127212685165256228595757095481483.25456.6743.599221867981967765737770256706641561475902603.25579.1344.551169411006103959848935589108505813577967484603.50620.9354.84125381180111145105581003095539119872283598024603.75662.3445.201337412588118881126310699101909727930489168560604.00703.3605.5214202133671262411960113621082110329988094689090604.50784.2156.1615835149041407613335126681206511516110161055710134钢绞线水平刚度系数表（Km/m）钢绞线面积（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)桩径(mm)M钢筋4005006007008009001000120041673974189012142010814618522326129833641151810914852013017942222126731335840449552215221242527833839845751763462015121026832638344049761062217524731838845852759673362521030539848958067075993772024082026834742450157765380572228182231340950459769078296672534482538150763075287399312311020_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)桩径mmM配筋400500600700800900100012008168188208228251018102010221025122012221225142014221425162016221625182018221825202020222025222022222225242024222425262026222625282028222825728810610712815115017722098121145147177209208245306238280350267315393185220276226268337267316395306362453344407509381451564418495618455225268338276328413326387486374444558422500628469556697515610764561664831605716897650769_316400326388490385459578444527664501595748557661831613727913667792994722855107377591911528289811230_5306705136117715806908706467689687118451064775921115883999612529021070134596411441436_694878659785992734875110580996312158831051132595611371433102912231540110013081645_120115211099131216601192142117971283153019381374163820685386724915807255276227775626638299626946211027系 数C250.970.980.980.980.980.98as600.980.980.980.990.990.990.9fcm0.970.970.980.990.990.99七、基坑支护设计的基本概念第三章 型钢钢管截面面积及单位重量第一节 水、煤气输送钢管（YB234-63）公称口径钢 管管 螺 纹(mm)英寸外径(mm)普 通 管加 厚 管基面处外 径(mm)每吋牙数螺纹长度（mm）壁厚(mm)不计管接头的理论重量（kg/m）壁厚(mm)不计管接头的理论重量（kg/m）圆锥形管螺纹圆柱形管螺纹61/810.002.000.392.500.4681/413.502.250.622.750.73103/817.002.250.822.750.97151/221.252.751.253.251.4420.956141214203/426.752.751.633.502.0126.44214141625133.503.252.424.002.9133.250111518325/442.253.253.134.003.7741.912111720403/248.003.503.844.254.5847.80511192250260.003.504.884.506.1659.616112224705/275.503.756.644.507.8875.18711232780388.504.008.344.759.8187.8871132301004114.004.0010.855.0013.44113.0341138361255140.004.5015.045.5018.24138.4351141381506165.004.5017.815.5021.63163.836114542注：1、公称口径是钢管的规格称呼，它不一定等于钢管外径减2倍壁厚之差。2、钢管分：不镀锌钢管（黑管）和镀锌钢管；带螺纹钢管和不带螺纹钢管。3、镀锌钢管比不镀锌钢管重8。4、钢管长度：不带螺纹的黑管，412米；带螺纹的黑管和镀锌管，46米。第二节 电焊钢管（YB242-63） 外 径(m m)壁 厚 (mm)0.50.60.81.01.21.41.51.61.82.02.22.5理 论 质 量 （kg/m）（6）0.0680.0800.1030.123（7）0.0800.0950.1220.148（8）0.0920.1100.1420.1730.202（9）0.1050.1250.1620.1970.231100.1170.1390.1820.222(0.261)（11）0.1290.1540.2010.2470.29020.1420.1690.2210.2710.3200.365(0.388)0.411（3）0.1840.2410.2960.3490.4000.4250.451（4）0.1990.2600.3210.3790.4340.4620.49050.2140.2800.3450.4090.468(0.499)0.529（6）0.2280.3000.3700.4380.503(0.536)0.568（7）0.2440.3200.3950.4680.5370.5730.60880.2580.3400.4190.4970.5720.6100.6470.7170.798（9）0.2740.3590.4440.5270.6060.6470.6870.7620.838200.2880.3790.4690.5560.6420.6840.7260.8060.888（21）0.4930.5860.6750.7210.7670.8510.937220.5180.6160.7100.7580.8060.8950.986（23）0.5430.6450.7450.7950.8460.9401.041.131.26240.5670.6740.7790.8320.8850.9841.091.181.33250.5920.7030.8130.8690.9251.031.131.241.39（26）0.6170.7340.8490.9060.9631.071.181.291.45（27）0.6410.7620.8820.9431.001.121.231.341.51280.6660.7920.9160.9801.041.161.281.401.57290.6910.8230.9511.021.081.221.331.471.64300.7150.8510.9861.051.121.261.381.511.70（31）0.7400.8811.021.091.151.301.431.561.76320.9101.051.131.201.341.481.621.82（33）0.9411.091.171.231.391531.671.88（34）0.9681.121.201.281.431.581.721.94（35）0.9981.161.241.321.471.631.782.00（36）1.031.191.281.361.521.681.832.07 续 表 外径（mm）壁 厚 (m m)1.21.41.51.61.82.02.22.52.83.03.23.5理 论 质 量 （kg/m）(37)1.061.231.311.401.561.731.892.13381.091.261.351.441.611.781.942.19（39）1.291.391.471.651.821.992.26401.331.421.521.691.872.052.31(41)1.361.461.551.741.922.102.37