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。
Abstract
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 geo-stress 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 according 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.
关键词
大型地下洞室群 /
高地应力 /
硬岩强度 /
围岩破坏类型 /
岩石强度应力比
Key words
large-scale underground cavern group /
high geo-stress /
hard rock strength /
failure type of surrounding rock /
ratio of rock strength to geostress
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基金
国家重点研发计划项目(2016YFC0401804);国家自然科学基金项目(51779018,51539002);中央级公益性科研院所基本科研业务费项目(CKSF2017030/YT, CKSF2017054/YT)
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