Method and system for simulating instability failure of soft and hard interbedding counter-tilt slope under rainfall condition

By constructing an FDEM numerical model and simulating alternating soft and hard slopes under rainfall conditions, the problem of landslide instability of alternating soft and hard slopes in existing technologies has been solved. This has enabled refined simulation and stability assessment of slope instability and failure, and provided an accurate safety factor assessment.

CN121706500APending Publication Date: 2026-03-20DAFANG LVTANG COAL MINE CO LTD +1
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Patent Information

Application Number
CN202610040224.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-13
Publication Date
2026-03-20

AI Technical Summary

Technical Problem

Existing FDEM methods cannot effectively simulate the landslide instability mechanism of alternating soft and hard slopes under rainfall conditions, and cannot accurately predict the sliding instability disaster of alternating soft and hard slopes.

Method used

A numerical model of FDEM was constructed, boundary conditions were set and initial gravity was applied, rainfall simulation was performed, rainwater infiltration depth was calculated, and the strength deterioration of the weak layer, rock mass weight gain, pore water pressure buoyancy and slope runoff effect were simulated simultaneously to determine slope instability and failure. Gravity loading simulation was performed until failure occurred before instability occurred to determine the slope safety factor.

Benefits of technology

It enables detailed simulation of the entire process of reverse-dip slopes with alternating soft and hard layers under rainfall conditions, accurately assesses slope stability, and provides reliable technical support for slope protection design.

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Abstract

The invention discloses an instability failure simulation method for a soft and hard interbedding counter-tilt slope under a rainfall condition, and relates to the technical field of rock mechanics and rock engineering. The method comprises the following steps: constructing an FDEM numerical model of a target soft and hard interbed counter-dip slope; setting boundary conditions for the numerical model, and applying initial gravity until a stress balance state is reached; based on the numerical model of stress balance, rainfall simulation is executed; according to a rainfall simulation result, judging whether slope instability failure occurs or not; if the slope instability failure does not occur and the load increasing condition is met, executing gravity load increasing simulation until the slope instability failure occurs while the rainfall simulation is maintained; and according to the critical gravity load when the slope is unstable, determining the slope safety coefficient of the target soft and hard interbed counter-tilt slope under the rainfall condition. According to the invention, fine simulation of the whole deformation and instability process of the soft and hard interbedding counter-dip slope under the rainfall condition can be realized.
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