地质强度指标对白鹤滩水电站地下厂房围岩稳定性的影响研究  

Study on the Influence of Geological Strength Index on the Stability of Surrounding Rock of Baihetan Underground Cavern

作　　者：汤艳春 商妤凡[1,2] 陈建林 张传庆[4] 朱泽民[1,2] 郑玉照 TANG Yan-chun;SHANG Yu-fan;CHEN Jian-lin;ZHANG Chuan-qing;ZHU Ze-min;ZHENG Yuzhao(Key Laboratory of Geological Hazardson Three Gorges Reservoir Area,Ministry of Education,Yichang 400041 China;College of Civil Engineering and Architecture,China Three Gorges University,Yichang 40004l,China;China Hydropower Consulting Group East China Survey,Design and Research Institute,Hangzhou 31oo14,China;State Key Laboratory of Rock and Soil Mechanics and Engineering,Wuhan Institute of Rock and Soil Mechanics Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]中国水电顾问集团华东勘测设计研究院,浙江杭州310014 [4]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《水电能源科学》2022年第10期140-143,共4页Water Resources and Power

基　　金：国家自然科学基金项目(51779129)。

摘　　要：在工程实践中,由于地质强度指标的取值主观性较强,难以细化地质强度指标对大型地下洞室围岩稳定性的影响。为此,基于白鹤滩水电站地下厂房洞室群,在验证已有Hoek-Brown本构参数合理性的基础上,讨论不同地质强度指标取值对围岩稳定性的影响。结果表明,厂房与主变洞围岩的变形量和塑性区深度随着峰值地质强度指标的增大而减小,且各部位变化规律基本一致;地下厂房与主变洞围岩变形、塑性区深度的变化规律及趋势可分为基本不变(地质强度指标为90~80)、缓变(地质强度指标为80~50)、陡变(地质强度指标为50~40)3个阶段;厂房上游岩锚梁处的变形量始终大于其他部位,厂房下游岩锚梁附近与主变洞上游边墙中部围岩的塑性区变化较其他部位幅度大,围岩塑性区深度增加比较明显。该研究为类似其他大型地下洞室开挖提供了理论参考。In engineering practice, due to the strong subjectivity of the value of geological strength index, it is difficult to refine the influence of geological strength index on the stability of surrounding rock of large underground cavern. Based on underground powerhouse cavern group of Baihetan hydropower station in validation document given by the rationality of Hoek-Brown constitutive parameters, the influence of different geological strength index values on the stability of surrounding rock was discussed. The results show that the powerhouse and the main transformer hole of surrounding rock deformation and the plastic zone depth decrease with the increase of peak geological strength index, and each part has almost the same change rule;The variation law and trend of surrounding rock deformation and plastic zone depth of underground powerhouse and main transformer cave can be divided into three stages: basically constant(geological strength index is 90-80), slow change(geological strength index is 80-50), and steep change(geological strength index is 50-40). The deformation of rock anchor beam upstream of the powerhouse is always greater than that of other parts. The plastic zone of surrounding rock near the rock anchor beam downstream of the powerhouse and the middle side wall upstream of the main transformer cave have a larger variation than that of other parts, and the depth of surrounding rock plastic zone increases obviously. The study provides theoretical reference for the subsequent excavation of other large underground cavern.

关 键 词：地质强度指标(GSI) Hoek-Brown模型 地下洞室 围岩稳定性 白鹤滩水电站 

分 类 号：TV731[水利工程—水利水电工程]