三峡库区消落带岩体劣化特性的实验研究  

Research on the characteristics of the differential deterioration of rock in Water level-fluctuating zone

作　　者：刘广宁[1] LIU Guang-Ning(Wuhan Centre of China Geological Survey, Wuhan 430205)

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：《华南地质与矿产》2018年第4期302-308,共7页Geology and Mineral Resources of South China

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

摘　　要：为了揭示三峡库区消落带内岩体劣化特性,进而对其劣化机制进行分析,作者在宏观调查的基础上,选取西陵峡上游归州河口-泄滩河口库岸为研究对象,采集侏罗系岩体2组原位样品,运用干湿循环进行模拟,进行了岩体劣化的耐崩解、CT断面扫描及三维立体重建等实验。研究结果表明,岩体在干-湿循环条件下,其耐崩解性、内部结构均发生显著变化;随着干-湿循环次数的增加,耐崩解性呈降低趋势,岩体结构向破碎、解体的趋势发展,且劣化改造程度侏罗系遂宁组高于沙溪庙组,其劣化改造机制与水-岩物理、化学和力学作用密切相关,是长期产生的劣化效应,具有渐进性和累积性。To understand the characteristics and mechanism of rock mass deterioration of water level-fluctuating zone in the Three Gorges Reservoir area,the experiments of rock mass collapse, CT section scan and three-dimensional reconstruction were carried out. The water level-fluctuating was simulated by the dry-wet circulation and two sets of in-situ samples of Jurassic rock mass were collected on the upper reaches of the Xiling Gorge. The results show that the fracture resistance and internal structure of rock mass change significantly under dry and wet cycle conditions. With the increase in the number of dry and wet cycles, the collapse resistance is decreasing, the rock mass structure is developing toward fragmentation and disintegration, and the deterioration degree of the Suining Group is higher than that of the Shaximiao Group. Its deterioration mechanism is closely related to the physical, chemical and mechanical functions of water-rock. It is a long-term deterioration effect and has a gradual and cumulative nature.

关 键 词：三峡库区 消落带 干-湿循环 耐崩解试验 CT 机理 

分 类 号：P642.2[天文地球—工程地质学]