基于软岩流变特性的边坡动态稳定性分析

以新疆华宏矿业北山露天煤矿边坡砂质泥岩为对象，对砂质泥岩弱层进行室内单轴压缩蠕变实验研究.采用西原体蠕变模型得到砂质泥岩的蠕变方程和松弛方程，结合Hoek-Brown准则反演了砂质泥岩弱层岩体的时变强度参数.应用FLAC3D有限差分模拟软件，对北山煤矿首采区非工作帮边坡进行动态稳定性分析.结果表明，由于砂质泥岩弱层强度参数随时间不断减小，边坡安全系数随之降低，历时18年左右，边坡安全系数从159逐渐降低到115，低于规范要求.研究结果为服务年限内矿山边坡动态安全预测提供了理论依据.

Slope Stability Analysis Based on Soft-Rock Rheological Characteristics

According to the results of creep testing on the sandy mudstone at Beishan open pit coal mine in Xinjiang, the creep curves were described by the visco-elastoplastic creep model and the time-varying parameters were revealed via Hoek-Brown strength criterion. The dynamic stability of the slope was analyzed using FLAC^3D numerical software. The result shows that the slope safety factor is reduced to 1.15 from 1.59 after 18 years, which is lower than the specification requirements. This work provides a theoretical basis for the assessment of the dynamic safety of this slope during its service life.