DISCUSSION ON EVOLUTION PROCESS OF FLAT ROCK LANDSLIDE AND ITS IDENTIFICATION IN RED STRATA AT EASTERN SICHUAN

Through the typical case investigation, this paper proposes evolutionary theory for gently inclined bedding rock landslide at east Sichuan. It further proposed the identification for different stages of evolution characteristics. The main findings are as follows. The first is the initial short-distance start-up phase. Deep fissures are mainly showed after the ramp edge. The second is the medium-term troughs expansion phase. Trench and groove (or depression pull ramp of catchment aggregation and occurrence of drama slippery topographical features) are mainly showed after ramp edge. They include chair-like terrain, three-channel surround or homologous Shuang'gou terrain, as well as terrain trailing edge of depression. Thirdly, large to extra-large rock bedded slope landslide is mostly the result of twice or even three times of starting to sliding in slope. Identification of the ancient (old) delineation of a large landslide is one of the important ways large rock bedded landslide. Fourthly, in the detailed investigation of the geological survey, the survey on slope micro-topography and tensile failure area is focused specially. The investigation is focused on the early short-range and medium-term pull-start groove troughs expansion phase of the insidious slope.