基于岩石强度应力比的大型地下洞室群布置设计方法  

METHOD OF LAYOUT DESIGN BASED ON RATIO OF ROCK STRENGTH TO IN-SITU STRESS FOR LARGE UNDERGROUND CAVERNS

作　　者：张勇[1,2] 肖平西[1,2] 程丽娟[1,2] 

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都610072 [2]国家能源水电工程技术研发中心大型地下工程分中心,四川成都610072

出　　处：《岩石力学与工程学报》2014年第11期2314-2331,共18页Chinese Journal of Rock Mechanics and Engineering

摘　　要：分析不同岩石强度应力比条件下典型水电站地下厂房洞室群围岩的破坏模式和变形特征,阐明岩石强度应力比与洞室围岩的承载能力、破坏模式、变形特征之间的关系,并根据洞室群效应及其对洞室群围岩稳定的影响、谷坡地应力场特征、地应力分级标准、大量已建水电站洞室群布置设计统计资料、数值分析成果、既有相关研究成果、工程经验,创建基于岩石强度应力比的大型地下洞室群布置设计方法,提出具体的量化指标和相关计算公式。该方法主要根据岩石强度应力比,结合场址地应力场特征、围岩结构面发育特征等进行地下洞室群的布置设计,较为全面地考虑了影响地下洞室群围岩稳定的主要因素,适用于各种地应力水平和复杂地质条件的地下洞室群布置设计。The failure patterns and deformation characteristics of surrounding rock masses in underground powerhouse caverns with different ratios of rock strength to in-situ stress（RSS） were analyzed and summarized,and the relationships between the RSS and the bearing capacity,the failure patterns and the deformation characteristics of surrounding rock masses were expounded. Based on the large amount of the statistical design data concerning the layout of caverns in hydropower stations,an innovative design method for the layout of underground caverns was proposes. The specific quantitative indicators and the related calculation formulas were presented. This method emphasized the important influence of RSS on the layout of caverns and based on the past experiences,the numerical analysis results and the recent findings in this field. The proposed method also took account into the interactions of adjacent caverns,the characteristics of in-situ stress in canyon region where caverns located,the classification of in-situ stress according to its magnitude and the distribution of weak discontinuities（e.g. joints and faults which are the main factors affecting the stability of underground caverns） etc.. It can be applied to the layout design of underground caverns under various stress levels or complex geological conditions.

关 键 词：岩石力学 地下厂房 岩石强度应力比 布置设计方法 破坏模式 地应力场特征 

分 类 号：TU45[建筑科学—岩土工程]