摘要
在围岩变形分析中引入流变效应,同时考虑支护对围岩变形的影响,根据Laplace变换和逆变换,推导了支护抗力和围岩变形随时间变化的解析解,从作用机理角度分析了支护时机对支护受力和围岩变形的影响,分析了围岩应力释放随时间的变化规律。研究表明:通过与数值解进行对比,验证了解析解推导过程的合理性;支护时机与支护受力呈正相关关系,支护越早,支护受力越大,与围岩变形呈负相关关系,支护越晚,围岩变形越大,且在隧道开挖后的早期对二者的影响更大;隧道开挖后,围岩应力释放随时间呈现出短时间内快速增加然后缓慢增加最后保持不变的三阶段变化过程,该规律可为支护时机的合理选取提供一定的参考依据。
The rheological effect is introduced into the deformation analysis of surrounding rock,and the influence of support on surrounding rock deformation is considered,according to Laplace transform and inverse transform,the analytical solutions of support resistance and surrounding rock deformation with time are derived.The influence of support time on support stress and surrounding rock deformation is analyzed from the perspective of action mechanism.The variation law of surrounding rock stress release with time is analyzed.The research shows that the rationality of the derivation process of the analytical solution is verified by comparing with the numerical solution.There is a positive correlation between the support time and the support force.With the earlier support,the support force is greater,and there is a negative correlation with the surrounding rock deformation.With the later support,the surrounding rock deformation is greater,and the impact on them is greater in the early stage after tunnel excavation.After tunnel excavation,the stress release of surrounding rock increases rapidly in a short time,then increases slowly,and finally remains unchanged,this law can provide some reference for the reasonable selection of support time.
作者
朱建林
唐思聪
刘志强
曹彧
陈鹏
Zhu Jianlin;Tang Sicong;Liu Zhiqiang;Cao Yu;Chen Peng(China Railway Southwest Research Institute Co.,Ltd.,Chengdu 611731,P.R.China;China Railway Eryuan Engineering Group Co.,Ltd,Chengdu 610031,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第S02期560-565,共6页
Chinese Journal of Underground Space and Engineering
基金
中国中铁股份有限公司科技研究开发计划(CZ01-重大-01)
中铁二院科技研究开发计划(KYY2019046)
关键词
流变
围岩
支护时机
应力释放
rheology
surrounding rock
support timing
stress release
作者简介
朱建林(1993—),男,重庆长寿人,硕士,工程师,主要从事软弱围岩隧道变形控制领域的科研工作。E-mail:zhujl_93@163.com
