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

TAN Yifan; SHI Yufeng; XU Changjie; ZHAN Gangyi

doi:10.11835/j.issn.2096-6717.2021.193

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

Civil Engineering | 更新时间：2022-11-07

- Experimental study on dynamic characteristics of saturated and weathered soft rock in metro tunnel basement
- Journal of Civil and Environmental Engineering Vol. 44, Issue 6, Pages: 33-41(2022)
- 作者机构：
  
  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
- 作者简介：
  
  brief:TAN Yifan (1997- ), main research interests: tunnel and underground engineering, E-mail: 452515225@qq.com.
  SHI Yufeng （corresponding author）， associate professor， E-mail： 827858500@qq.com.
- 基金信息：
  
  National and Regional Science Fund Project(51768020);Natural Science Foundation of Jiangxi Province(20192BAB206043)
- DOI：10.11835/j.issn.2096-6717.2021.193
  CLC： U451;TU458.3
- Received：31 May 2021，
  
  Published：30 December 2022
- 稿件说明：
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谈亦帆,石钰锋,徐长节等.地铁隧道基底饱水风化软岩动力特性试验研究[J].土木与环境工程学报,2022,44(06):33-41.

TAN Yifan,SHI Yufeng,XU Changjie,et al.Experimental study on dynamic characteristics of saturated and weathered soft rock in metro tunnel basement[J].Journal of Civil and Environmental Engineering,2022,44(06):33-41.
谈亦帆,石钰锋,徐长节等.地铁隧道基底饱水风化软岩动力特性试验研究[J].土木与环境工程学报,2022,44(06):33-41. DOI： 10.11835/j.issn.2096-6717.2021.193.

TAN Yifan,SHI Yufeng,XU Changjie,et al.Experimental study on dynamic characteristics of saturated and weathered soft rock in metro tunnel basement[J].Journal of Civil and Environmental Engineering,2022,44(06):33-41. DOI： 10.11835/j.issn.2096-6717.2021.193.

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1 000、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。

Abstract

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 1 000 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.

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Keywords

references

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