Speed equivalent characterization method for researching hydrodynamic action landslide motion mechanism

Abstract

The invention discloses a speed equivalent characterization method for researching hydrodynamic action landslide motion mechanism. The method comprises the following steps: carrying out zoning and zoning on a landslide according to engineering geological data; dividing the landslide body movement into a wading part and a non-wading part; dividing a landslide mass into a plurality of strip blocks based on a PenjiaZheng striping algorithm, establishing a block discrete element model, applying a seepage field change rule brought by hydrodynamic factors to the discrete model by utilizing an equivalent force method, and carrying out stress analysis on discrete elements forming the block; performing stress analysis on a single discrete unit, and converting underground water evolution and mechanical degradation effects caused by hydrodynamic factors into changes of the speed of the sliding body; and finally, giving a boundary condition integral to solve the sliding speed equivalence of each zoning zoning landslide mass, so that the landslide motion mechanism under the action of hydrodynamic force can be intuitively, simply and conveniently analyzed. The method can be applied to landslide numerical calculation, and can also be applied to landslide geomechanics physical model tests.

Description

technical field [0001] The invention relates to a method for analyzing the movement mechanism of a landslide, in particular to a velocity equivalent characterization method for the study of the movement mechanism of a hydrodynamic action landslide, and belongs to the fields of water conservancy engineering, rock and soil mechanics, and geological disaster prevention and control engineering. Background technique [0002] Hydrodynamic landslides refer to slope rock and soil instability disasters driven by hydrodynamic factors. The hydrodynamic effect is mainly caused by factors such as reservoir water level regulation (especially sudden drop), rainfall (torrential rain, long rain) and other factors during the reservoir operation period. Generally, the mechanisms of hydrodynamic forces acting on landslides are divided into the following three categories: [0003] (1) During large-scale rainfall, the infiltration of surface runoff causes the groundwater table to rise continuous...

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Problems solved by technology

At the same time, the pore water pressure increases, the effective stress decreases, and the shear strength decreases

Moreover, the alternation of dryness and wetness brought about by long-term reservoir water level changes promotes the development and disintegration of cracks inside the rock and soil mass, which seriously damages its integrity and is not conducive to stability;

[0004](2) When the water level of the reservoir drops sharply, the water level outside the slope drops rapidly, and the drop rate of the groundwater level inside the slope cannot keep up with the drop rate of the water level of the reservoir, forming large head difference

[0005](3) The water level of the reservoir continuously erodes the slope structure during the change process, and the rock-soil mass and water produce physical and chemical interactions, resulting in the deterioration of the physical and mechanical properties of the landslide mass. Significantly reduce the strength of rock and soil mass and structural surfaces

However, it is difficult to control the sliding process of the landslide in the test. The sliding component force is too small and the friction coefficient of the sliding surface is too large, and the landslide cannot slide or does not slide completely. The method cannot accurately control the motion form, sliding sequence and water entry speed of the sliding body during the sliding process.

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