摘要
公路隧道的建设经常遇到软弱围岩,为避免突水涌泥导致的围岩失稳等工程灾害,施工中采用注浆加固等措施加以控制。以公路隧道经过软弱围岩区段为背景,采用仿真模拟与监控测量等方法,探讨不同加固层厚度对隧道周围岩体变形和塑性区发展的影响规律,并结合初期支护的受力情况和安全系数,全面评估隧道的安全稳定性,以确定最佳的注浆加固层厚度,在该基础上对比验证数值模拟的可靠程度。结果表明:隧道围岩变形、塑性区与初支内力随加固圈厚度的增加均相应减小,而初支安全系数逐渐增大,集合变形、塑性区与安全系数3种角度分析得出加固圈合理厚度为3 m;实际与模拟数据的误差范围在20%以内,论证了3 m加固圈厚度满足隧道施工安全,验证了模拟具有一定可靠性。可为软弱围岩隧道注浆加固施工提供一定参考。
The construction of highway tunnels often encounters weak surrounding rocks,and in order to avoid engineering disasters such as surrounding rock destabilization caused by water gushing and mud surges,grouting reinforcement and other measures are used to control the construction.Based on the project of highway tunnel crossing soft surrounding rocks,this paper used the simulation and monitoring measurement methods to explore the effects of different reinforcement layer thickness on deformation of the rock and the development of the plastic zone around the tunnel.Combined with the force situation and safety factor of the initial support,the safety and stability of the tunnel was comprehensively assessed to determine the optimum thickness of the grouting reinforcement layer,and the reliability of the numerical simulation was verified.The results show that with the increasing thickness of the reinforcement ring,the deformation of the tunnel surrounding rock,the plastic zone,and the internal force of the initial support decreased,while the safety factor of the initial support increased gradually.In terms of the deformation,plastic zone,and safety factors,the reasonable thickness of the reinforcement ring was 3 m.The error range between the actual and simulated data was within 20%,which proved that the 3-m thickness of the reinforcement ring could meet the safety construction of the tunnel,and validated the reliability of the simulation.This paper can provide certain reference for the grouting reinforcement construction of soft surrounding rock tunnel.
作者
张大卫
ZHANG Dawei(Shanxi Transportation New Technology Development Co.,Ltd.,Taiyuan,Shanxi 030012,China)
出处
《山西交通科技》
2025年第4期124-128,共5页
Shanxi Science & Technology of Transportation
关键词
Ⅴ级围岩
注浆加固
数值分析
合理厚度
class-Ⅴsurrounding rock
grouting reinforcement
numerical analysis
reasonable thickness
