EVALUATE THE RISK OF LAND-SLIDING BASED ON GEOPHYSICAL DATA

摘要

Currently, geophysical data are widely available in most areas. Usually, the detailed geometrical and mechanical feature of rock base is supplied by the geophysical surveying. How to use the geophysical data to evaluate the risk of land-sliding is discussed in this research. Firstly, the strain in surface layer is formulated by the rock-base deflection angular. This formulation is based the fact that the original geological structure is horizontal. The current rock-base geometrical feature is the result of geological deformation. Secondly, the stress of surface layer is formulated by the mechanical parameter from the seismic data. This stress is expressed as the function of the rock-base deflection angular. This formulation is based on the fact the surface deformation is mainly controlled by the rock base deformation. Finally, the internal stress strength is calculated and is used to evaluate the risk of land-sliding. This risk analysis formulation takes the deflection angular of rock-base formation as the principle geometrical variant quantity and the related mechanical quantities are determined by seismic surveying data.