摘要
基于Drucker-Prager准则,在平面应变条件下推导了不同锈蚀度下深埋圆形隧洞混凝土衬砌支承力的解析式。以香炉山深埋段隧洞为研究背景,通过解析法与数值模拟方法获取了5种不同锈蚀度下混凝土衬砌的受力状态,并将解析解与数值计算值进行了比较。结果表明:深埋条件下,衬砌拱顶内侧易产生应力集中,在施工及耐久性评价时,需对该位置加强监测;随着锈蚀度的增加,衬砌受力逐渐降低,当锈蚀度达到30%时,硬岩段与破碎岩段衬砌承受的围岩压力分别降低了7.32%和5.03%;解析法与数值模拟结果相差较小,推导的解析式结果可信,可为类似工程的耐久性设计提供参考。
Based on the Drucker-Prager criterion,the analytical formula of the concrete lining support force of deep-buried circular tunnels under different corrosion degrees was derived under plane strain conditions.Taking the deep-buried tunnel of Xianglu Mountain as the research background,the stress state of the concrete lining under five different corrosion degrees was obtained by analytical methods and numerical simulation methods.This engineering instance is introduced to compare the calculated load with numerical simulated value.The result show that:Under deep burial conditions,stress concentration is likely to occur on the inside of the apex of lining.During construction and durability evaluation,it is necessary to strengthen monitoring of this location.As the degree of corrosion increases,the stress on the lining gradually decreases.When corrosion rate reaches 30%,the rock pressure on the lining of the hard rock section and the fracture rock section decreases by 7.32%and 5.03%,respectively.The difference between the analytical method and the numerical simulation results is small,so the derived analytical formula are credible,which can provide some reference value for the durability design of similar projects.
作者
刘晓辉
桂欣
LIU Xiaohui;GUI Xin(School of Energy and Power Engineering,Xihua University,Chengdu 610039 China;Key Laboratory of Deep Earth Science and Engineering(Sichuan University),Ministry of Education,Chengdu 610065 China;Key Laboratory of Fluid and Power Machinery,Ministry of Education,Xihua University,Chengdu 610039 China)
出处
《西华大学学报（自然科学版）》
CAS
2021年第3期48-56,共9页
Journal of Xihua University:Natural Science Edition
基金
四川省教育厅重点项目(18ZA0457)
西华大学自然科学重点基金项目(Z17113)
深地科学与工程教育部重点实验室(四川大学)开放基金资助(DESE202003)。
关键词
解析法
数值模拟
锈蚀
混凝土衬砌
深埋隧洞
analytical method
numerical simulation
corrosion
concrete lining
deep buried
