地铁隧道基底饱水风化软岩动力特性试验研究  

Experimental study on dynamic characteristics of saturated and weathered soft rock in metro tunnel basement

作　　者：谈亦帆 石钰锋[2] 徐长节[2,3] 詹刚毅[4] TAN Yifan;SHI Yufeng;XU Changjie;ZHAN Gangyi(Jiangxi Provincial Architectural Design and Research Institute Group Co,Ltd,Nanchang 330013,P.R.China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,P.R.China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,P.R.China;China Railway Shanghai Design Institute Group Co,Ltd,Shanghai 200070,P.R.China)

机构地区：[1]江西省建筑设计研究总院集团有限公司,南昌330013 [2]华东交通大学江西省岩土工程基础设施安全与控制重点实验室,南昌330013 [3]浙江大学滨海和城市岩土工程研究中心,杭州310058 [4]中铁上海设计院集团有限公司,上海200070

出　　处：《土木与环境工程学报（中英文）》2022年第6期33-41,共9页Journal of Civil and Environmental Engineering

基　　金：国家地区科学基金(51768020);江西省自然科学基金(20192BAB206043)。

摘　　要：为探究在列车长期循环荷载作用下地铁隧道基底风化软岩的累积塑性应变变化规律,以南昌地铁基底泥质粉砂岩为研究对象,开展不同风化程度饱水泥质粉砂岩在动应力比、静偏应力比、围压和频率等工况的室内动三轴试验,研究在不同影响因素下饱水风化泥质粉砂岩的动力变形特性规律。结果表明:在不同影响因素下,全、中风化泥质粉砂岩累积应变分别在加载1000、100次开始趋于稳定;全风化泥质粉砂岩的临界动应力比在0.3~0.4之间;与不同动应力比和静偏应力比情况相比,改变围压和频率对两种风化泥质粉砂岩累积应变影响不大;通过分析试验结果数据,提出考虑加载次数、动应力比等因素的累积塑性应变数学模型。In order to explore the cumulative plastic strain of weathered soft rock at the base of metro tunnels under long-term cyclic loading of trains,this paper focuses on the weathered argillaceous siltstone at the base of Nanchang Metro and develops laboratory dynamic triaxial tests of working conditions considering dynamic stress ratio,static deviator stress ratio,confining pressure and loading frequency,the dynamic deformation characteristics of saturated weathered argillaceous siltstone under different influential factors are studied.The results show that the cumulative plastic strain of fully weathered argillaceous siltstone and moderately weathered argillaceous siltstone become stable after 1000 and 100 cycles,respectively,and the critical dynamic stress ratio of fully weathered argillaceous siltstone is between 0.3 and 0.4;compared with different dynamic stress ratios and static deviator stress ratios,confining pressure and frequency have marginal effect on the cumulative strain of the two weathered argillaceous siltstones;by analyzing the test result data,a mathematical model of cumulative plastic strain considering the loading times,dynamic stress ratio and other factors is proposed.

关 键 词：地铁隧道 风化泥质粉砂岩 动三轴试验 塑性应变 非线性拟合 

分 类 号：U451[建筑科学—桥梁与隧道工程] TU458.3[交通运输工程—道路与铁道工程]