落石冲击荷载下框架门式棚洞结构优化探讨  

Exploration of structural optimization for the frame-type shed-tunnel under the impact of load of rock-fall

作　　者：郭江[1,2,3] 王全才[1,2] 张群利[1,2,3] 郭绍平[1,2,3] 吴清 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [3]中国科学院大学,北京100049 [4]西安中交土木科技有限公司,陕西西安710075

出　　处：《水文地质工程地质》2014年第6期92-97,共6页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(51068006);中交股份科技研发项目(2011-ZJKJ-04)

摘　　要：采用ANSYS/LS-DYNA有限元软件建立框架门式棚洞的两种仿真模型,模拟棚洞结构在落石冲击作用下的动力响应过程,分析冲击力在棚洞结构中的传递和扩散情况,提出通过控制冲击力扩散过程的方式对结构优化。对比结构优化前后在冲击力作用下的应力和变形情况,发现通过改变结构顶板倾角能在一定程度上减小冲击作用引起的最大等效应力,降低棚洞顶板变形,提高棚洞的抗冲击性能,且门式直柱式棚洞的结构优化效果尤为明显。Simulation models of the frame-type shed-tunnel structure from two kinds of tunnel shape by the finite element program ANSYS / LS-DYNA were established to research the dynamic response process,and analyzed the transmission and dispersion characteristics of impact force in the shed-tunnel structures.Based on this,this paper presented a new method by controlling the stress process to reduce the stress and distortion,which could improve the impact resistance of the frame-type shed-tunnel structure.The results,comparing thetransmission and dispersion characteristics under the impact load before and after optimization,showed that the maximum equivalent stress and roof resistance caused by impact load could be reduced by changing the roof angle to some extent,and the optimization effect on straight column-style shed-tunnel with straight column was especially remarkable.

关 键 词：框架门式棚洞 落石冲击 数值模拟 结构优化 

分 类 号：U417.1[交通运输工程—道路与铁道工程]