双线铁路隧道施工过程仿真分析

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1、/NOPR双线铁路隧道施工过程仿真分析KEYW,PR_STRUC,1!保留结构分析部分菜单/PREP7!进入前处理器ET,1,PLANE42ET,2,BEAM3KEYOPT,1,3,2!设置成平面应变模型!定义模型中的相关参数MP,EX,1,6E6!地表上MP,PRXY,1,0.26MP,DENS,1,1760MP,EX,2,10E6!土层2MP,PRXY,2,0.35MP,DENS,2,1910MP,EX,3,15E6!土层3MP,PRXY,3,0.28MP,DENS,3,2040MP,EX,4,14E6!土层4MP,PRXY,4,0.29MP,DENS,4,2075

2、MP,EX,5,30E6!土层5MP,PRXY,5,0.3MP,DENS,5,2150MP,EX,6,50E6!超前小导管加固区MP,PRXY,6,0.2MP,DENS,6,3000MP,EX,7,20E6!锚杆加固区MP,PRXY,7,0.2MP,DENS,7,1910MP,EX,8,210E9!钢支撑MP,PRXY,8,0.17MP,DENS,8,7800MP,EX,9,21E9!初期支护MP,PRXY,9,0.2MP,DENS,9,2200!定义实常数。模型中采用梁单元来模拟初期支护和临时支护，其中初期支护为C20喷射混凝土，临时支护包括中隔墙的立柱和临时仰拱，为2

3、5a号工字钢。定义其实常数的命令流如下：R,1,0.009546,0.0001005,0.25,0,0,0!工字钢实常数，按每米2根算R,2,0.35,3.573E-3,0.35!初期支护实常数!建立几何模型。由于CRD法开挖隧道的过程相当复杂，建立几何模型时通常采用自底向上的建模方法，即先根据施工设计图纸找出一些关键点，再由这些关键点生成圆弧等段线，再由这些线段生成面，最后再对这些面进行单元划分。K,1,-5.65,4.35,0!定义关键点K,2,-2.84,6.17,0K,3,0.75,6.65,0K,4,3.47,5.90,0K,5,5.65,4.35,0K,6,6

4、.24,3.66,0K,7,6.83,2.69,0K,8,-0.45,4.54,0K,9,-1.11,1.77,0K,10,-6.21,3.71,0K,11,-6.83,2.69,0K,12,-7.41,0.73,0K,13,-7.31,-1.3,0K,14,-7.16,-1.86,0K,15,-6.98,-2.37,0K,16,-6.46,-3.19,0K,17,-5.63,-3.84,0K,18,0,-5.23,0K,19,1.10,-5.18,0K,20,4.02,-4.54,0K,21,5.63,-3.84,0K,22,6.44,-3.21,0K,23,6.98,

5、-2.37,0K,24,7.17,-1.83,0K,25,7.31,-1.3,0K,26,7.41,0.72,0K,27,-1.14,0.65,0K,28,-0.6,-2.23,0K,29,-0.3,-2.98,0K,30,-5.79,4.49,0K,31,-2.92,6.35,0K,32,0.75,6.85,0K,33,3.66,6.02,0K,34,5.79,4.49,0K,35,-7.6,0.79,0K,36,-7.16,-2.44,0K,37,-6.6,-3.34,0K,38,-5.72,-4.02,0K,39,-1.84,-5.29,0K,40,1.12,-5.

6、38,0K,41,4.09,-4.73,0K,42,5.72,-4.02,0K,43,6.59,-3.34,0K,44,7.16,-2.44,0K,45,7.60,0.76,0K,501,-3.72,2.02,0K,502,2.73,1.89,0K,503,-2.9,-2.09,0K,504,3.30,-2.04,0LARC,11,1,10!由关键点生成各段圆弧LARC,1,3,2!以关键点1和3为端点，关键点2为中间点生成圆弧LARC,3,5,4LARC,5,7,6LARC,9,3,8LARC,13,11,12LARC,15,13,14LARC,17,15,16LARC

7、,19,17,18LARC,21,19,20LARC,23,21,22LARC,25,23,24LARC,7,25,26LARC,28,9,27LARC,19,28,29LARC,7,9,502LARC,9,11,501LARC,28,13,503LARC,25,28,504LARC,30,32,31LARC,32,34,33LARC,36,30,35LARC,38,36,37LARC,40,38,39LARC,42,40,41LARC,44,42,43LARC,34,44,45SAVEL,3,32!由关键点生成各段直线L,1