高地应力硬岩大型洞室群围岩变形破坏与岩石强度应力比关系研究
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摘要
岩石强度应力比是表征围岩稳定性的重要指标之一。研究围岩变形破坏与强度应力比的关系,揭示二者间的规律性联系,对高地应力硬岩大型地下洞室群围岩稳定性控制具有重要意义。以具典型高地应力特点的锦屏一级水电站和猴子岩水电站2个硬岩大型洞室群为研究对象,首先系统梳理了2个工程的围岩岩性、岩石强度和初始地应力等工程地质条件,并详细统计了洞室群施工期围岩破坏类型和数量;通过对地下洞室群围岩的岩石强度应力比进行分区,并结合围岩140多个破坏现象和发生部位,建立了高地应力硬岩大型洞室群围岩变形破坏与岩石强度应力比之间的联系;采用不同的初始地应力分级标准,并结合洞室群围岩破坏特征,验证了基于强度应力比修正的地应力分级标准对高地应力硬岩洞室群的适用性,揭示了围岩应力诱导型破坏随岩石强度应力比的变化规律。研究成果有助于今后高地应力条件下硬岩大型地下洞室群施工期围岩破坏类型预测,并为提出具有针对性的施工期围岩稳定控制措施提供参考。
The ratio of rock strength to geostress is a very important indicator of surrounding rock stability. Studying the relationship between the failure and strength-to-stress ratio of surrounding rock so as to reveal their characteristic connections is of great significance for the control of surrounding rock stability of large-scale underground hard rock cavern group. With the large-scale underground hard rock caverns of Jinping hydropower plant stage-I and Houziyan hydropower plant as case study,we established the relationship between failure of surrounding rock under high geostress condition and strength-to-stress ratio. Firstly the engineering geological conditions,inclusive of lithology,rock strength,and initial geostress,are summarized,and the types,quantities,and locations of failures during cavern group construction are statistically analyzed; then the surrounding rocks of underground caverns are partitioned ac-cording to strength-to-stress ratio. Moreover,in the light of the surrounding rock failure characteristics,the applicability of geostress grading standard modified based on the strength-to-stress ratio is verified,and the variation law of stress-induced failure of surrounding rock with strength-to-stress ratio is revealed. The research findings are conducive for the prediction of failure type of surrounding rocks of large-scale underground hard rock cavern group,and offer reference for targeted stability control measures.
The ratio of rock strength to geostress is a very important indicator of surrounding rock stability. Studying the relationship between the failure and strength-to-stress ratio of surrounding rock so as to reveal their characteristic connections is of great significance for the control of surrounding rock stability of large-scale underground hard rock cavern group. With the large-scale underground hard rock caverns of Jinping hydropower plant stage-I and Houziyan hydropower plant as case study,we established the relationship between failure of surrounding rock under high geostress condition and strength-to-stress ratio. Firstly the engineering geological conditions,inclusive of lithology,rock strength,and initial geostress,are summarized,and the types,quantities,and locations of failures during cavern group construction are statistically analyzed; then the surrounding rocks of underground caverns are partitioned ac-cording to strength-to-stress ratio. Moreover,in the light of the surrounding rock failure characteristics,the applicability of geostress grading standard modified based on the strength-to-stress ratio is verified,and the variation law of stress-induced failure of surrounding rock with strength-to-stress ratio is revealed. The research findings are conducive for the prediction of failure type of surrounding rocks of large-scale underground hard rock cavern group,and offer reference for targeted stability control measures.
引文
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[9]李仲奎,周钟,汤雪峰,等.锦屏一级水电站地下厂房洞室群稳定性分析与思考[J].岩石力学与工程学报,2009,28(11):2167-2175.
[10]黄书岭,王继敏,丁秀丽,等.基于层状岩体卸荷演化的锦屏I级地下厂房洞室群稳定性与调控[J].岩石力学与工程学报,2011,30(11):2203-2216.
[11]HE Gang,JIANG Chang-sen,LEI Ying-cheng,et al.Study on Unloading Relaxation Characteristics for Rock Masses under High Geostress[J].Applied Mechanics and Materials,2014,638/639/640:594-600.
[12]廖伟,何刚,许海燕,等.高地应力条件下岩体松弛时间效应检测[J].工程地球物理学报,2011,8(5):609-615.
[13]杨静熙,陈长江,刘忠绪.高地应力洞室围岩变形破坏规律研究[J].人民长江,2016,47(6):37-41.
[14]杨静熙,刘忠绪,黄书岭.高地应力条件下锦屏一级主厂房围岩松弛深度形成规律和支护时机研究[J].工程地质学报,2016,24(5):775-787.
[15]DL/T 5415-2009,水电水利工程地下建筑物工程地质勘察技术规程[S].北京:中国水利出版社,2009.
[16]GB 50287-2006,水力发电工程地质勘察规范[S].北京:中国计划出版社,2006.
[17]申艳军,徐光黎,宋胜武,等.高地应力区水电工程围岩分类法系统研究[J].岩石力学与工程学报,2014,33(11):2267-2275.
[18]黄书岭,丁秀丽,廖成刚,等.深切河谷区水电站厂址初始应力场规律研究及对地下厂房布置的思考[J].岩石力学与工程学报,2014,33(11):2210-2224.
[2]谢国权,孙文良.锦屏一级水电站地下厂房围岩松弛变形机理分析与治理[J].水利水电技术,2010,41(2):17-21.
[3]陈长江,刘忠绪,孙云.锦屏一级水电站地下厂房施工期下游拱腰部位的裂缝成因分析[J].水电站设计,2011,27(3):87-89.
[4]程丽娟,李仲奎,郭凯,等.锦屏一级水电站地下厂房洞室群围岩时效变形研究[J].岩石力学与工程学报,2011,30(增1):3081-3088.
[5]魏进兵,邓建辉,王俤剀,等.锦屏一级水电站地下厂房围岩变形与变形破坏特征分析[J].岩石力学与工程学报,2010,29(6):1198-1205.
[6]侯东奇,廖成刚,幸享林,等.锦屏一级水电站地下厂房下游拱围岩变形开裂破坏成因分析与加固措施研究[J].水力发电学报,2012,31(5):230-235.
[7]周钟,巩满福,汤雪峰,等.四川省雅砻江锦屏一级水电站地下厂房洞室群围岩变形破坏机制及加固措施研究专题报告[R].成都:中国水电工程顾问集团成都勘测设计研究院,2009.
[8]张勇,肖平西,丁秀丽,等.高地应力条件下地下厂房洞室群围岩的变形破坏特征及对策研究[J].岩石力学与工程学报,2012,31(2):228-244.
[9]李仲奎,周钟,汤雪峰,等.锦屏一级水电站地下厂房洞室群稳定性分析与思考[J].岩石力学与工程学报,2009,28(11):2167-2175.
[10]黄书岭,王继敏,丁秀丽,等.基于层状岩体卸荷演化的锦屏I级地下厂房洞室群稳定性与调控[J].岩石力学与工程学报,2011,30(11):2203-2216.
[11]HE Gang,JIANG Chang-sen,LEI Ying-cheng,et al.Study on Unloading Relaxation Characteristics for Rock Masses under High Geostress[J].Applied Mechanics and Materials,2014,638/639/640:594-600.
[12]廖伟,何刚,许海燕,等.高地应力条件下岩体松弛时间效应检测[J].工程地球物理学报,2011,8(5):609-615.
[13]杨静熙,陈长江,刘忠绪.高地应力洞室围岩变形破坏规律研究[J].人民长江,2016,47(6):37-41.
[14]杨静熙,刘忠绪,黄书岭.高地应力条件下锦屏一级主厂房围岩松弛深度形成规律和支护时机研究[J].工程地质学报,2016,24(5):775-787.
[15]DL/T 5415-2009,水电水利工程地下建筑物工程地质勘察技术规程[S].北京:中国水利出版社,2009.
[16]GB 50287-2006,水力发电工程地质勘察规范[S].北京:中国计划出版社,2006.
[17]申艳军,徐光黎,宋胜武,等.高地应力区水电工程围岩分类法系统研究[J].岩石力学与工程学报,2014,33(11):2267-2275.
[18]黄书岭,丁秀丽,廖成刚,等.深切河谷区水电站厂址初始应力场规律研究及对地下厂房布置的思考[J].岩石力学与工程学报,2014,33(11):2210-2224.