四川泸定地区岩土体类型与地质灾害

Rock mass types and their bearings on the geologic hazards in the Luding region,Sichuan

岩土体为地质灾害的活动主体。地质灾害的孕育、发生和成灾等,都是岩土体的不同活动形式的反映。不同岩土体具有不同的物理、力学及水理性质,其可能产生的地质环境问题也不同。在进行灾害预测评价时,必须充分考虑不同岩土体与地质灾害的关系。

The initiation, development and occurrence of geological hazards are attributed, without exception, to different types of activity of rock masses. The exposed strata in the Luding region, Sichuan may be classified, on the basis of physical properties, hardness and fithology, into three engineering geological rock associations, including friable rocks, semihard-hard rocks and hard rocks. The friable rocks are generally easy to bring about the geological hazards such as landslides, debris flows and unstable slopes. The semihard-hard rocks may be related to the geological hazards such as landslides, rock avalanches and unstable slopes. As the hard rocks, there is no possibility for the acidic rocks to result in the geological hazards; only the intermediately basic to uhrabasic rocks may be responsible for the generation of rock avalanches.