现代交通技术2025，Vol.22Issue(3)：27-32,6.
浅埋隧道软弱破碎围岩的变形破坏规律及控制机理研究
Research on the Deformation and Failure Law and Control Mechanism of Weak and Broken Surrounding Rock in Shallow Tunnel
摘要
Abstract
To investigate the deformation and failure behavior of weak and broken surrounding rock in shallow-buried tun-nels and to assess the stabling effect of horizontal stress on the deformation of weak and broken surrounding rock,a two-dimensional numerical simulation study was carried out by using GDEM-BlockDyna software.The deformation and dis-placement of arch crown,left arch waist under different horizontal stresses of two tunnel models with 12 m and 30 m buried depth in weak surrounding rock are analyzed.The results show that the deformation of weak and broken surrounding rock presents four stages:rapid deformation,slow deformation,stabilization and stable balance,and the failure of surrounding rock presents a gradual failure process;with the increase of the buried depth of the tunnel,the speed of the whole tunnel reac-hing the equilibrium and stable state will be slowed down;the application of horizontal stress can affect the displacement value of tunnel crown settlement.With the increase of horizontal stress,the cohesion and internal friction angle of rock and soil mass change,which improves the ability of rock and soil mass to resist damage.However,when it increases to a certain extent,it will accelerate the damage of rock and soil mass.Therefore,an optimal horizontal stress value exists that results in the minimun crown settlement of the tunnel.关键词
水平应力/软弱破碎围岩/变形/GDEM-BlockDynaKey words
horizontal stress/weak and broken surrounding rock/deformation/GDEM-BlockDyna分类
交通工程引用本文复制引用
苏伟胜,杨红运,金凯新,徐龙旺,杨升,丛俊余..浅埋隧道软弱破碎围岩的变形破坏规律及控制机理研究[J].现代交通技术,2025,22(3):27-32,6.基金项目
国家自然科学基金项目(51904043、52078089、52078090、52274176) （51904043、52078089、52078090、52274176）
