Landslide dynamic stability evaluation method based on strength reduction method

Abstract

The invention provides a landslide dynamic stability evaluation method based on a strength reduction method. The method comprises the following steps: establishing a generalization model according tothe water level period scheduling condition of a reservoir area where a landslide is located, calculating a mechanical analysis time scale and a fluid analysis time scale by utilizing parameter data of a landslide rock-soil body, comparing the mechanical analysis time scale with the fluid analysis time scale, and determining a fluid-solid coupling simulation method; establishing a creep constitutive model of the slip band soil, and identifying creep parameters of the slip band soil; calculating the long-term shear strength of the slip band soil; constructing a landslide model, and calculatinga stress field, a strain field and a seepage field of the landslide; calculating landslide stability coefficients. The method provided by the invention reveals landslide deformation characteristics and an evolution mechanism under a hydrodynamic condition, achieves the dynamic evaluation of the stability of the creeping landslide in the reservoir area, and provides a basis for the prediction, early warning, prevention and control of landslides of the same type.

Description

technical field [0001] The invention relates to the field of geological disaster prevention and control, in particular to a landslide dynamic stability evaluation method based on a strength reduction method. Background technique [0002] Since the implementation of a series of national hydropower development plans, a large number of water conservancy and hydropower projects have been built in Southwest China. The construction and operation of these projects have significantly changed the hydrodynamic conditions in the reservoir area, resulting in the resurrection and generation of a large number of reservoir landslides, which seriously threaten human beings. safety of life and property. At present, the most commonly used normative method for evaluating landslide stability coefficients is difficult to take into account the influence of real-time changes in water level and the constitutive relationship of landslide rock and soil mass. This static evaluation method is difficult...

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Problems solved by technology

However, most of the current analyzes use the M-C model, which does not take into account the critical strain state change and strength degradation caused by the creep characteristics of landslide rock and soil materials; at the same time, due to the low calculation efficiency of the previous version, most studies use the GEOSLOPE software The obtained seepage field is imported with the "watertable" command to simulate the groundwater level of the landslide, without real coupling

These two deficiencies have led to deviations in the current research on the evolution mechanism and stability evaluation of hydrodynamic creep landslides; at the same time, because the formula for solving the landslide stability coefficient in the standard method does not include a time index, it is difficult to evaluate the stability of landslides in different landslides. Dynamic Stability of Landslides Under Internal and External Dynamics

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