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基于地应力场加卸载的地下洞室稳定数值模拟研究

祝方才, 余继江, 刘丙肖, 李大建, 王勤富

祝方才, 余继江, 刘丙肖, 李大建, 王勤富. 基于地应力场加卸载的地下洞室稳定数值模拟研究[J]. 岩土工程学报, 2016, 38(9): 1578-1585. DOI: 10.11779/CJGE201609004
引用本文: 祝方才, 余继江, 刘丙肖, 李大建, 王勤富. 基于地应力场加卸载的地下洞室稳定数值模拟研究[J]. 岩土工程学报, 2016, 38(9): 1578-1585. DOI: 10.11779/CJGE201609004
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ZHU Fang-cai, YU Ji-jiang, LIU Bing-xiao, LI Da-jian, WANG Qin-fu. Numerical analysis of stability of underground openings through loading/unloading of in-situ stress fields[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(9): 1578-1585. DOI: 10.11779/CJGE201609004
Citation: ZHU Fang-cai, YU Ji-jiang, LIU Bing-xiao, LI Da-jian, WANG Qin-fu. Numerical analysis of stability of underground openings through loading/unloading of in-situ stress fields[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(9): 1578-1585. DOI: 10.11779/CJGE201609004
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基于地应力场加卸载的地下洞室稳定数值模拟研究  English Version

  • 湖南工业大学土木工程学院,湖南 株洲 412007

基金项目: 湖南省自然科学基金重点项目（13JJ2033）
详细信息
    作者简介:

    祝方才(1972- ),男,博士,教授,主要从事洞室工程和边坡稳定的教学与研究。E-mail: zhufangcai@163.com。

  • 中图分类号: TU431；O319.56

Numerical analysis of stability of underground openings through loading/unloading of in-situ stress fields

  • College of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China

摘要

    摘要
  • 摘要: 将地下洞室稳定问题看作一非线性系统,研究了加卸载响应比（LURR）理论在洞室稳定分析中的应用前景及其实现途径,提出了基于地应力加卸载的实现方法。利用RFPA2D Basic软件,结合模型试验建立了平面应变数值模型,研究了加卸载实现方法,以拱顶沉降、水平收敛和声发射作为LURR参数,分析了逐级加卸载下变化特征。研究表明,拱顶沉降和收敛在荷载不太大的情况下,围岩处于稳定状态,LURR基本在1左右变化,当洞室围岩接近破坏时,拱顶沉降和水平收敛的LURR值出现震荡,不同位置处的水平收敛LURR呈现不同幅度的震荡。声发射随着荷载的增大而增加,加载声发射事件数和能量一般大于卸载情况,但未出现明显的加卸载响应。相关参数的LURR特征可用于预测洞室渐进失稳。
    Abstract: By treating the stability of underground openings as a nonlinear system, application of loading/unloading response ratio (LURR) theory is studied, and a new loading/unloading approach is put forward through increase/reduction of in-situ stress fields. Based on the RFPA2D Basic software and physical model tests, a plane strain numerical model is established to study mechanical behavior under multistage loading/unloading, and three response parameters including crown subsidence, horizontal convergence and acoustic emission are studied. The numerical results show that LURRs of these parameters float around 1.0 under not too large load, and the surrounding rocks are stable. With the increase of load, LURRs of crown subsidence and horizontal convergence increase slowly. While the surrounding rocks are close to failure, LURRs present acute fluctuation. It should be noted that LURRs of horizontal convergence at different locations don’t present the same fluctuation amplitude. The acoustic emission doesn’t mean that the distinct change of LURR is close to failure. However, it can indicate the damage evolution of the surrounding rocks. The above-mentioned achievements can be utilized in prediction of progressive instability.
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    • 参考文献(22)
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出版历程
  • 收稿日期:  2015-07-03
  • 发布日期:  2016-09-24

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