摘要
为了优化隧道复合式衬砌结构的支护时机,依托离隰高速陈家湾隧道,基于位移反分析法,通过监测数据反算围岩应力场及其力学参数,建立了有限元反分析模型,采用逆解法计算初期支护结构的剩余变形和应力衰减过程,结合抗剪安全系数和最大拉应力指标,分析了围岩稳定性和衬砌结构的受力特征,结果表明:衬砌施作与初支闭合的最佳间隔时间为39d,此时拉应力与抗剪安全系数均满足设计要求,可降低结构失稳风险。
In order to optimize the supporting time of tunnel composite lining structure,based on the Chenjiawan Tunnel of Lixi Expressway,a finite element back analysis model was established based on the displacement back analysis method,and the stress field and mechanical parameters of surrounding rock were calculated by monitoring data.The residual deformation and stress attenuation process of the initial support structure were calculated by the inverse method.Combined with the shear safety factor and the maximum tensile stress index,the stability of surrounding rock and the stress characteristics of lining structure were analyzed.The results show that the optimal interval time between lining construction and initial support closure is 39 days,and the tensile stress and shear safety factor meet the design requirements,which can reduce the risk of structural instability.
作者
郎宏伟
LANG Hongwei(Highway Engineering General Contracting Branch of Shanxi Road and Bridge Construction Group Co.,Ltd.,Taiyuan,Shanxi 030000,China)
出处
《黑龙江交通科技》
2025年第5期87-90,95,共5页
Communications Science and Technology Heilongjiang
关键词
隧道
位移反分析法
复合式衬砌
支护时机
tunnel
displacement back analysis method
composite lining
supporting timing
