复合土钉墙(GB50739-2011)验算计算项目:复合土钉墙(GB50739-2011)1计算时间:2014-07-1610:04:32星期三执行规范:[1]《复合土钉墙基坑支护技术规范(GB50739-2011)》,本文简称《土钉规范》[2]《建筑基坑支护技术规程(JGJ120-2012)》,本文简称《基坑规范》----------------------------------------------------------------------一、计算简图--------------------------------------------------------------------------------------------------------------------------------------------二、已知条件----------------------------------------------------------------------2.1基本信息规范或方法复合土钉墙基坑支护技术规范GB50739-2011计算目标验算计算书类型详细基坑等级二级支护结构重要性系数1.000基坑深度(m)9.000开挖步骤[每步开挖深度](m)1.2,1.0,1.0,1.0,1.0,1.0,1.0,1.0,0.8设置截水帷幕否设置微型桩否坡线段数3超载个数12.2坡线信息序号水平投影长(m)竖直投影长(m)坡角(°)12.4034.00059.0021.0000.1005.7132.9444.90059.002.3超载信息序号荷载类型超载值作用深度作用宽度到边坑距离形式长度(m)(kPa)(m)(m)(m)125.0000.0006.0002.000条形---2.4土层信息土层数5采用加固土否坑内水位深度(m)15.000坑外水位深度(m)15.000序号土类型层厚重度饱和重度粘聚力摩擦角土钉的qsk与锚固体摩擦(m)(kN/m3)(kN/m3)(kPa)(°)(kPa)阻力(kPa)1素填土3.00018.200---10.00010.00020.00020.0002粉土2.50018.200---43.60011.60050.00050.0003粉土2.00018.300---37.80010.40055.00055.0004粗砂3.50021.000---0.00033.00090.00090.0005强风化岩3.00019.900---10.00015.00085.00085.0002.5土钉和锚杆信息土钉道数:6序号材料水平间距竖向间距入射角钻孔直径长度配筋钢材牌号外径壁厚(m)(m)(°)(mm)(m)(mm)(mm)1钢管1.3001.50010.000---6.000---Q235钢48.02.82钢管1.5001.50010.000---8.000---Q235钢48.02.83钢管1.5001.30010.000---8.000---Q235钢48.02.84钢管1.5001.50010.000---8.000---Q235钢48.02.85钢管1.5001.50010.000---6.000---Q235钢48.02.86钢管1.3001.30015.000---6.000---Q235钢48.02.8锚杆道数:1序号类型水平间距竖向间距入射角总长锚固长锚固体抗拉力抗拉力(m)(m)(°)(m)(m)直径(mm)标准值(kN)设计值(kN)1锚杆1.5004.20015.00015.00012.000130110.00012.0002.6稳定计算信息圆弧滑动计算目标自动搜索最危险滑裂面圆弧滑动分析方法瑞典条分法应力状况总应力法土条宽度(m)0.400基坑下稳定计算截止深度(m)0.000基坑下稳定计算搜索步长(m)1.000搜索最不利滑裂面是否考虑加筋否土条切向分力与滑动方向反向时当下滑力对待组合作用折减系数-├土钉1.000├预应力锚杆0.500├截水帷幕---└微型桩---2.7其他信息局部抗拉考虑锚杆否整体稳定安全系数1.300作用基本组合的综合分项系数1.250土钉的工作系数ψ1.000抗隆起安全系数1.500抗隆起软弱层距离ld(m)0.000----------------------------------------------------------------------三、计算内容----------------------------------------------------------------------(1)土钉承载力验算(2)整体稳定性验算(3)土钉杆体截面积计算(4)抗隆起稳定性验算----------------------------------------------------------------------四、计算结果----------------------------------------------------------------------4.1土钉承载力验算4.1.1各工况土钉承载力详细计算过程[工况1]--------------------------------------------------------开挖深度:1.200(m)(1)土压力计算第1坡土压力katg245ak2tg24510.00020.704Eaka2m1H20.704218.2001.20029.226pmmax8Ea7H89.22671.2008.787(2)土钉承载力计算无[工况2]--------------------------------------------------------开挖深度:2.200(m)(1)土压力计算第1坡土压力katg245ak2tg24510.00020.704Eaka2m1H20.704218.2002.200231.011pmmax8Ea7H831.01172.20016.110(2)土钉承载力计算无[工况3]--------------------------------------------------------开挖深度:3.200(m)(1)土压力计算第1坡土压力katg245ak2tg24510.10020.702Eaka2m1H20.702218.2003.200265.378pmmax8Ea7H865.37873.20023.349(2)土钉承载力计算1)土钉1土钉长度:6.000(m)土钉直径:48(mm)Tjk1cosjpSxjSyjppmpq23.3490.00023.3490.552Tjk1cos10.0000.55223.3491.3003.20054.422土钉抗拔承载力:Rdjqsiklmij1.4Tjk土层号破裂面外土钉粘结强度标准值抗拔承载力累计抗拔承载力长度(m)qsik(kPa)(kN)(kN)15.64420.00017.02217.022[工况4]--------------------------------------------------------开挖深度:4.200(m)(1)土压力计算第1坡土压力katg245ak2tg24510.45720.693Eaka2m1H20.693218.2004.2002111.205pmmax8Ea7H8111.20574.20030.260(2)土钉承载力计算1)土钉1土钉长度:6.000(m)土钉直径:48(mm)Tjk1cosjpSxjSyjppmpq30.2600.00030.2600.548Tjk1cos10.0000.54830.2601.3002.25049.244土钉抗拔承载力:Rdjqsiklmij1.4Tjk土层号破裂面外土钉粘结强度标准值抗拔承载力累计抗拔承载力长度(m)qsik(kPa)(kN)(kN)15.44720.00016.42716.4272)土钉2土钉长度:8.000(m)土钉直径:48(mm)Tjk1cosjpSxjSyjppmpq30.26010.56140.8210.548Tjk1cos10.0000.54840.8211.5001.95066.431土钉抗拔承载力:Rdjqsiklmij1.4Tjk土层号破裂面外土钉粘结强度标准值抗拔承载力累计抗拔承载力长度(m)qsik(kPa)(kN)(kN)17.75450.00058.46458.464[工况5]--------------------------------------------------------开挖深度:5.200(m)(1)土压力计算第3坡土压力katg245ak2tg24510.62020.689Eaka2m1H20.689218.2004.9002150.488pmmax8Ea7H8150.48874.90035.099第2坡土压力katg245ak2tg24511.60020.665Eaka2m1H20.665218.2000.10020.061pmmax8Ea7H80.06170.1000.692第1坡土压力katg245ak2tg24511.60020.665Eaka2m1H20.665218.2000.20020.242pmmax8Ea7H80.24270.2001.384(2)土钉承载力计算1)土钉1土钉长度:6.000(m)土钉直径:48(mm)Tjk1cosjpSxjSyjppmpq35.0990.00035.0990.546Tjk1cos10.0000.54635.0991.3002.25056.872土钉抗拔承载力:Rdjqsiklmij1.4Tjk土层号破裂面外土钉粘结强度标准值抗拔承载力累计抗拔承载力长度(m)qsik(kPa)(kN)(kN)16.00020.00018.09618.0962)土钉2土钉长度:8.000(m)土钉直径:48(mm)Tjk1cosjpSxjSyjppmpq35.09910.56145.6600.546Tjk1cos10.0000.54645.6601.5002.950111.925土钉抗拔承载力:Rdjqsiklmij1.4Tjk土层号破裂面外土钉粘结强度标准值抗拔承载力累计抗拔承载力长度(m)qsik(kPa)(kN)(kN)18.00050.00060.31960.319[工况6]--------------------------------------------------------开挖深度:6.200(m)(1)土压力计算第3坡土压力katg245ak2tg24510.62020.689Eaka2m1H20.689218.2004.9002150.488pmmax8Ea7H8150.48874.90035.099第2坡土压力katg245ak2tg24511.60020.665Eaka2m1H20.665218.2000.10020.061pmmax8Ea7H80.06170.1000.692第1坡土压力katg245ak2tg24510.90020.682Eaka2m1H20.682218.2581.20028.965pmmax8Ea7H88.96571.2008.538(2)土钉承载力计算1)土钉1土钉长度:6.000(m)土钉