基于统计损伤的大型地下洞室围岩分类研究  

Study on the Classification of Surrounding Rock in Large Underground Caverns Based on Statistical Damage

作　　者：柯旭昊 孙宁 曹学兴 王如宾[1] 刘渊泽 许晓逸 徐卫亚[1] KE Xuhao;SUN Ning;CAO Xuexing;WANG Rubin;LIU Yuanze;XU Xiaoyi;XU Weiya(Geotechnical Research Institute,Hohai University,Nanjing 210098,China;PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,China;Science and Technology Department,Huaneng Lancang River Hydropower Inc.,Kunming 650214,China)

机构地区：[1]河海大学岩土工程科学研究所,南京210098 [2]中国电建中南勘察设计研究院,长沙410014 [3]华能澜沧江水电股份有限公司科技部,昆明650214

出　　处：《三峡大学学报(自然科学版)》2025年第3期7-13,共7页Journal of China Three Gorges University:Natural Sciences

基　　金：国家自然科学基金重点项目(51939004);中国华能集团有限公司科技项目(HNKJ22-H109)。

摘　　要：围岩分类在水工建筑物的勘察设计阶段有着重要的作用.澜沧江GX水电枢纽区地质条件复杂,天然状态下地应力较高,常用的水力发电系统围岩工程地质分级方法(简称HC法)以围岩的强度应力比为依据对高地应力地区的围岩进行降级.本文在工程地质勘测的基础上,开展了三轴力学实验,提出了一种基于统计损伤的围岩分类方法来量化计算高地应力条件对围岩质量的影响,即:在HC法初分类的基础之上,计算岩体的统计损伤值作为围岩评分的折减系数,从而替代HC法中直接对高地应力地区的围岩进行降级的方法.使用该方法对GX地下厂房洞室群围岩进行分类,得到了基于损伤力学的GX地下洞室围岩分类结果,并将该结果与原分类结果对比进行验证.结果表明该方法不仅能够体现出地应力增大与围岩质量劣化之间的正相关性,而且具有更高的准确性和可靠性,可以准确高效地完成高地应力地区的围岩分类工作,对高地应力地区的岩体质量评价有着重要的理论价值.The classification of surrounding rock plays a critical role in the survey and design stages of hydraulic structures.The geological conditions of the Lancang River GX Hydropower Hub area are complex and in a high in-situ stress state.The commonly used engineering geological classification method in high in-situ stress regions for hydropower systems(referred to as the HC method)degrades surrounding rock quality based on the strength-stress ratio.In this study,grounded in detailed engineering geological surveys,triaxial mechanical tests were conducted and a novel classification method based on statistical damage to quantitatively assess the impact of high in-situ stress on surrounding rock quality was proposed.The new method modified the HC classification by incorporating a statistical damage value of the rock mass as a reduction factor in the rock quality rating,replacing the direct degradation approach for high-stress conditions in the HC method.The method was applied to classify the surrounding rock in the GX underground cavern,yielding classification results based on damage mechanics.After a comparison between the new method and the original classification method,the validity of the new method was confirmed.The results indicate that the method not only reflects the positive correlation between increased in-situ stress and surrounding rock quality deterioration,but also provides enhanced accuracy and reliability.It enables efficient and precise classification of surrounding rock in high-stress regions,offering significant theoretical value for evaluating rock mass quality under high-stress conditions.

关 键 词：岩体质量评价 围岩分类 岩体损伤 统计损伤 地下洞室 围岩稳定 

分 类 号：TV223[水利工程—水工结构工程]