风化作用下煤系土边坡稳定性数值模拟分析

Numerical Simulation Analysis on Stability of Coal-bearing Soil Slopes under Weathering

摘要:

煤系土易受风化作用影响而发生强度劣化，引发边坡失稳。以广东某高速公路煤系土边坡为背景，基于微波模拟风化试验建立的强度劣化模型，采用有限元强度折减法，分析不同风化深度（0.5~2.0 m）边坡位移与安全系数的变化规律。结果表明：风化深度从1.0 m增至1.5 m时，安全系数降幅最大，约为18%；风化程度由E1增至E2时，安全系数降低38.2%，表明风化程度对稳定性影响更为显著。模拟结果与实际监测数据吻合，验证了模型的可靠性，为煤系土边坡防护设计提供了理论依据。

Abstract:

Coal-bearing soil is prone to strength degradation due to weathering, which can lead to slope instability. Taking a coal-bearing soil slope of an expressway in Guangdong as the background, and based on a strength deterioration model established through the microwave simulation weathering tests, the finite element strength reduction method is used to analyze the variation patterns of slope displacement and safety factor under different weathering depths (0.5~2.0 m). The results indicate that when the weathering depth increases from 1.0 m to 1.5 m, the safety factor decreases the largest by approximately 18%, and when the weathering degree increases from E1 to E2, the safety factor decreases by 38.2%, which shows that the weathering degree has a more significant impact on the stability. The simulation results agree well with actual monitoring data, verifying the reliability of the model and providing a theoretical basis for the protective design of coal-bearing soil slopes.