3D Simulation Of Landslide Movements Based On FVM And Its Application

Lanslides are common nature disasters with the characters of widely distributed, frequencely occurrences, large damages. They will seriously threaten peoples' lives and properties, will cause serious loses once sliding. For the engineering distribution and disasters' mitigation, it has very important significance to understand the characters of landslides' movements, to estimate the extensions in advance.Landslides' movements are not absolute progresses, but tightly associated with landslides systems before sliding. So simulating the landslides' movements must be based on their system sciences. Reasonable simulation landslides' movements and predicting the disaster areas should base on the particular research of landslides' forming conditions, evolution mechanisms, stability analyse and the evolution trends of landslides. The dynamic movement model and control equations are put forward based on landslide kinematics theory. Finally the special calculation program is compiled to imitate landslides, movements adopting finite volume method and CFD technology. (1) Two existing landslide movement models including Block Model and Sassa Model are introduced and available common calculation methods are summarized. (2) The basic principles and grid structure of finite volume method (FVM) were briefly described and FVM's common-used discretization scheme and characteristics and application were introduced.(3) Based on reasonable hypothesis of landslide body, the control equations of landslide movement are given and landslide body is discretized by using FVM. A computation program has been made by Visual FORTRAN and its basic functions and using methods were introduced. (4) The sliding characteristics of Lanzhou Shixiakou landslide is emulated by using compiled special computer programs. Simulation results are compared with the actual sliding situation and found that the simulation results testify the rationality and practicability of the compiled special computer programs.(5)Study on No.1 downstream-Side landslide of Jishixia hydropower station, its movement conditions of landslide failure, landslide scale, inundated area, landslide dam, and run up height of backwater are predicted.