库水变动状况下危岩变形破坏机理分析  

Analysis on deformation mechanism of dangerous rock in water level change condition

作　　者：刘广宁[1] 齐信[1] 王芳婷[1] 王世昌[1] 黄波林[1] 

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205

出　　处：《桂林理工大学学报》2017年第2期293-298,共6页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(41372321);中国地质调查局灾害预警项目(12120114079301);中国地质调查局水工环地质调查项目(DD20160257)

摘　　要：为了查明大山庙危岩体宏观变形破坏特征,掌握在库水波动作用下,危岩体内部岩体劣化程度及其强度变化状况,分析其变形破坏机理,对其失稳模式进行研判,在宏观调查的基础上,进行了现场声波测试,以及室内干湿循环状况下抗压强度和耐崩解性试验测试。结果表明:危岩体变形破坏特征主要为拉裂、剪切、坠落,干湿循环对危岩体有较明显的劣化作用,其完整性、强度和耐崩解性均存在明显降低趋势。大山庙危岩体变形破坏机理为在库水波动作用下产生的结构和材料连续累进性破坏过程,其最可能的失稳模式为剪切-滑移。In order to find out the macroscopic deformation and failure characteristics of the Dashanmiao dangerous rock mass,the damage degree and strength change state of the rock mass under the fluctuation of the reservoir water level are analyzed. The deformation and failure mechanism are analyzed,and the failure mode is judged. On the basis of the macroscopic investigation,the field acoustic test was carried out,and the compressive strength and resistance to disintegration test were carried out in indoor dry and wet cycle conditions. The results show that the deformation characteristics of dangerous rock are mainly pullapart,shear and falling. Dry and wet circulation has obvious deterioration effect on dangerous rock mass. The integrity,strength and resistance to disintegration of rock mass are obviously decreasing. The deformation mechanism of Daxingmiao dangerous rock mass is the continuous progressive failure process of the structure and material under the fluctuation of reservoir water level. The most likely instability mode is shear-slip.

关 键 词：库水位 危岩 变形破坏机理 材料破坏 结构破坏 

分 类 号：P642.22[天文地球—工程地质学]