某高速公路隧道二次衬砌ansys应力分析 Mechanical analysis on Hiway-Tunnel Support Structural.docx

1目录一、 设计要求 ..........................................................................................................................2二、 荷载计算 ..........................................................................................................................2三、 模型建立与分析 ..............................................................................................................51. 通过 Autocad 建模查询各关键点坐标 ...........................................................................52. 分析标题、单元类型、材料属性、实常数定义、截面常数定义： ...........................53. 生成关键点： ..................................................................................................................64. 生衬砌圆弧 ......................................................................................................................65. 划分单元 ..........................................................................................................................76. 生成弹簧单元并删除外圈辅助单元和辅助线 ...............................................................87. 施加约束 ..........................................................................................................................88. 在每个单元中间生成一关键点以此查询半单元长度 ...................................................99. 计算节点上应施加的荷载 ...............................................................................................910. 荷载施加 ....................................................................................................................1011. 施加重力加速度和定义生死单元 .............................................................................1012. 求解和定义单元表 ....................................................................................................10四、 结果分析与处理 ............................................................................................................111. 查看变型图杀死受拉弹簧单元 .....................................................................................112. 最扣结果 ........................................................................................................................14a) 变形图 ....................................................................................................................14b) 弯矩图 ....................................................................................................................14c) 剪力图 ....................................................................................................................15d) 轴力图 ....................................................................................................................153. 各单元内力详见附表 ....................................................................................................152一、 设计要求某高速公路隧道，采用矿山法施工，隧道位于Ⅴ级围岩中。

其中，Ⅴ级围岩隧道埋深为 26.257m隧道内轮廓断面如下图，用 ANSYS 分析隧道二衬(二衬采用 C30 混凝土，厚度为 50cm )内力，做出内力图，列出各单元内力值材料物理力学指标如下：二、 荷载计算根据《公路隧道设计规范_JTG_D70--2004》规定如下：6．2．3 Ⅳ—Ⅵ级围岩中探埋隧道的围岩压力为松散荷载时，具垂直均布压力及水平均布压力可按下列公式计算：1 垂直均布压力按式(6．2．3)计算3附录 E 浅埋隧道荷载的计算方法E．0．1 浅埋和深埋隧道的分界，按荷载等效高度值，并结合地质条件、施工方法等因素综合判定按荷载等效高度的判定公式为故： 151(5)0.(.8).6mh=0.424209q8.96=7.kPa2.5h.1203.4sPqiBH隧道实际埋深=19+7.267=26.267m< =30.24m 故属于浅埋隧道！PH4通过 Autocad 查询得衬砌截面外边周长 c=33.8017m112tan0.246.7tan2()826.7(1)35.6821kPa0.4(5).9..83.04q35.0725dghBBe kP  o8a二衬砌荷载按计算荷载的的 30%计，并采用基本荷载组合故：11220.0.52.61.kP943a.35.3.057.20005189kddqee5三、 模型建立与分析1. 通过 Autocad 建模查询各关键点坐标2. 分析标题、单元类型、材料属性、实常数定义、截面常数定义：/prep7 /title,Mechanical analysis on Hiway-Tunnel Support Structural et,1,3 et,2,14 mp,ex,1,30e9mp,prxy,1,0.2 mp,dens,1,2500 r,1,0.5,0.0104166667,0.5r,2,100e6 SECTYPE, 1, BEAM, RECT, , 0 SECOFFSET, CENT SECDATA,1,0.5,0,0,0,0,0,0,0,063. 生成关键点：k,1,-4.81872390,-2.04053317 k,2,-5.49815868,-1.30105769 k,3,-5.65000000,0.00000000 k,4,0.00000000,5.65000000 k,5,5.65000000,0.00000000 k,6,5.49815868,-1.30105769 k,7,4.81872390,-2.04053317 k,8,-5.28122168,-2.93633418 k,9,-6.25730539,-1.96970284 k,10,-6.56000000,0.00000000 k,11,0.00000000,6.56000000 k,12,6.56000000,0.00000000 k,13,6.25730539,-1.96970284 k,14,5.28122168,-2.93633418 k,154. 生衬砌圆弧larc,1,2,15,2.52larc,2,3,15,5.65larc,3,4,15,5.65larc,4,5,15,5.65larc,5,6,15,5.65larc,6,7,15,2.52larc,7,1,15,14.25 larc,8,9,15,3.52larc,9,10,15,6.65 larc,10,11,15,6.65 larc,11,12,15,6.65 larc,12,13,15,6.65 larc,13,14,15,3.52 larc,14,8,15,15.25 75. 划分单元lsel,,,,1,7,1 LATT,1,1,1, , , , lsel,,,,1 lesize,all,,,4 lmesh,all lsel,,,,2 lesize,all,,,6 lmesh,all lsel,,,,3 lesize,all,,,34 lmesh,all lsel,,,,4 lesize,all,,,34 lmesh,all lsel,,,,5 lesize,all,,,6 lmesh,all lsel,,,,6 lesize,all,,,4 lmesh,all lsel,,,,7 lesize,all,,,36 lmesh,all lsel,,,,8 lesize,all,,,4 lmesh,all lsel,,,,9 lesize,all,,,6 lmesh,all lsel,,,,10 lesize,all,,,34 lmesh,all lsel,,,,11 lesize,all,,,34 lmesh,all lsel,,,,12 lesize,all,,,6 lmesh,all lsel,,,,13 lesize,all,,,4 lmesh,all lsel,,,,14 8lesize,all,,,36 lmesh,all6. 生成弹簧单元并删除外圈辅助单元和辅助线type,2 real,2 e,1,125 e,3,127 e,4,128 e,5,129 e,2,126 e,7,131 e,8,132 e,9,133 e,10,。