MECHANISM AND STABILITY OF HUASHIBAN LANDSLIDE ON THE DOWN TIGER-LEAP-GOEGE ALONG JINSHA RIVER

Huashiban landslide is located at the down Tiger-Leap-Gorge along the left bank of Jinshajiang river. It has caught wide attention because it obstructed the Jinshajiang river and destroyed the road on Oct. 28, 1996. The field work revealed that the landslide is a typical consequent rock landslide. The thick stratified limestone in the slope was cut into different diamond blocks by bedding plane and two steep sets joints. The original safe state of diamond blocks were transformed into unsafe state as suspended blocks due to many factors such as weathering, gravity, rainfall and road construction. Furthermore, the rock blocks present as step-like suspended blocks for the sidelong relation of the strikes of slope and strata. At the more outside of the slope, the blocks are more unstable. Therefore, the landslide is characterized by collapses of rock blocks with different sizes and can occur from time to time.