大型地下洞室塑性松动区围岩变形破坏特征及测试估算方法研究  

Research on deformation and failure characteristics of surrounding rock in plastic relaxed zone of large underground cavern and its estimation method

作　　者：由静 次德多吉 罗京 张瑞 刘健 YOU Jing;CIDE Duoji;LUO Jing;ZHANG Rui;LIU Jian(PowerChina Chengdu Engineering Co.,Ltd.)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都610072 [2]雅砻江流域水电开发有限公司,四川成都610051

出　　处：《大坝与安全》2023年第1期37-43,共7页Dam & Safety

摘　　要：塑性松动区的形成与扩展是地下工程围岩稳定的关注热点。结合弹塑性理论、工程物探和监测资料,探讨了大型地下洞室塑性区围岩的应力状态和变形破坏特征,并提出了基于多点位移计监测结果的塑性松动区估算方法。研究结果表明,多点位移计变形量沿孔深的分布主要累积于塑性区,可应用孔深-位移曲线估算围岩塑性松动区界限点的深度及位移量,估算结果与弹塑性理论计算结果基本一致,说明本研究具有一定的参考价值。The formation and expansion of plastic relaxed zone is a hot issue in the research of surround⁃ing rock stability of underground engineering.Combining elastic-plastic theory,engineering geophysical prospecting and monitoring data,the stress state and the deformation and failure characteristics of sur⁃rounding rock in plastic zone of large underground cavern are discussed,and the estimation method for plastic relaxed zone based on monitoring results from multi-point displacement meters is proposed.The results show that the distribution of deformation along the hole depth mainly accumulates in plastic zone.The depth and displacement of boundary points of plastic relaxed zone can be estimated by the hole depth-displacement curve.The estimation results are basically consistent with the calculation re⁃sults of elastic-plastic theory,indicating that this study has certain reference value.

关 键 词：地下洞室 弹塑性理论 围岩变形 多点位移计 

分 类 号：TV698[水利工程—水利水电工程]