三峡大学学报（自然科学版）2025，Vol.47Issue(3)：7-13,7.DOI:10.13393/j.cnki.issn.1672-948X.2025.03.002
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
摘要
Abstract
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Key words
rock mass quality evaluation/surrounding rock classification/rock mass damage/statistical damage/underground cavern/surrounding rock stability分类
水利科学引用本文复制引用
柯旭昊,孙宁,曹学兴,王如宾,刘渊泽,许晓逸,徐卫亚..基于统计损伤的大型地下洞室围岩分类研究[J].三峡大学学报（自然科学版）,2025,47(3):7-13,7.基金项目
国家自然科学基金重点项目(51939004) （51939004）
中国华能集团有限公司科技项目(HNKJ22-H109) （HNKJ22-H109）
