四川盆地红层水岩作用岩石弱化时效性研究  

RESEARCH ON TIME EFFECT OF ROCK WEAKENING BY WATER-ROCK INTERACTION OF REDBEDS IN SICHUAN BASIN

作　　者：王运生[1] 吴俊峰[1] 魏鹏[1] 王晓欣[1] 韩丽芳[1] 李月美[1] 马宏宇 邵虹涛[1] 徐鸿彪[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《岩石力学与工程学报》2009年第A01期3102-3108,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40672174)

摘　　要：通过对四川地区16个水库采样点现场调查及所采集的岩石样品进行室内微观分析及软化系数测定,红层岩石具有经历长时间浸泡后软化系数随年代逐渐变小的规律,这种强度的降低是水库库水变幅带的"化学风化作用"及"浸泡软化作用"共同叠加的结果。试验结果表明,红层经过30～50a水库浸泡后,泥岩的软化系数较目前设计部门给出的降低10%～20%,粉砂质泥岩浸泡后软化系数降低15%左右,低于泥岩降低幅度。Through experiments on 16 sets of samples of red beds collected from 16 reservoirs, the law that the softening coefficients of long-term water-soaked redbeds decrease is obtained. Rock weakening is the result of long-term softening and weathering co-action in lower water level of the rock in the region between the highest and lower water levels. Analytical results show that the softening coefficient of mudstone can be reduced 10% - 20% after 30 - 50 years soaking compared with that obtained in laboratory, while the softening coefficient of silty mudstone can be reduced about 15% after 30 - 50 years soaking compared with that obtained in laboratory.

关 键 词：岩石力学 红层 岩石弱化 水岩作用 时效性 四川盆地 

分 类 号：TU45[建筑科学—岩土工程]