锚杆支护方式对深埋洞室隔冲击效果影响的数值模拟研究  

Numerical simulations on influences of impact-wave shading for deep tunnel with bolt support

作　　者：王雪[1] 杨帅 史志杰 郑际镜 王艳锋 WANG Xue;YANG Shuai;SHI Zhijie;ZHENG Jijing;WANG Yanfeng(School of Mechanical Engineering,Tianjin University,300350 Tianjin,China;School of Civil Engineering and Architecture,Anyang Normal University,455000 Anyang,China;96911 Unit,100120 Beijing,China)

机构地区：[1]天津大学机械工程学院,天津300350 [2]安阳师范学院建筑工程学院,安阳455000 [3]96911部队,北京100120

出　　处：《应用力学学报》2024年第1期129-139,共11页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.11702017)。

摘　　要：与浅埋洞室相比,随着埋深增加而产生的高地应力现象使深埋洞室安全性评价更加复杂。本研究在考虑地应力平衡的前提下,采用有限元与无限元相结合的方法,对冲击荷载作用下深埋洞室的锚杆支护方式进行了设计与优化。计算结果表明:在平衡初始地应力之后,Mises应力会随着锚杆长度、疏密程度的增加略有增长。当锚杆长度和疏密程度增至某一特定值时,洞室洞壁的位移和塑性应变将达到最小值,洞室围岩将达到相对安全状态。锚杆间隔布置下,长锚杆数量的增加将提高洞室围岩的安全性。当对洞室拱脚进行重点支护时,整个洞壁的位移均有所减小。Compared with shallow buried tunnel,the high stress caused by the increase of buried depth makes the safety evaluation of deep buried tunnel more complicated.Therefore,this paper designs and optimizes the bolt support mode of deep buried tunnel under impact load with the premise of in-situ stress balance by combining the finite and infinite elements.This paper not only studies the deformation characteristics of surrounding rock under impact load,but also analyzes the influence of length,density,length interval arrangement and key support of arch foot on the safety of tunnel.The results show that the Mises stress has almost no change before and after the in-situ stress balance,but the displacement is highly affected.When impact wave is loaded,the Mises stress first increases slightly with the increase of bolt length and density.When the length and density of the bolt increase to a certain value,the Mises stress no longer increases.The displacement and plastic strain of the cavern wall reach their minimum.In this case,the surrounding rock of the tunnel reaches a relatively safe state.Regarding to the bolt spacing,reasonable arrangement of short dense bolts is beneficial to the safety of tunnel,and the increase of the number of long anchors can improve the safety of the tunnel.This is due to the wide reinforcement range of long anchor to the surrounding rock.A high strength bearing layer is formed above the tunnel.It can withstand a large load,and transfer the load to the bottom of the straight wall.When the arch foot of the cavern is mainly supported,the displacement of the arch foot as well as the whole wall is reduced.

关 键 词：深埋洞室 地应力平衡 锚杆支护 围岩应力 

分 类 号：TU457[建筑科学—岩土工程]