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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.
The uniaxial compressive creep experiment of the weak layer of sandy mudstone is carried out with the sandy mudstone of the Beishan open pit coal mine in Huahong Mining Co., Ltd. The creep and relaxation equations of the sandy mudstone are obtained by using the creep model of the West China Plain, Combined with Hoek-Brown criterion, the time-dependent strength parameters of thin-grained rock mass in sandy mudstone are retrieved. The dynamic stability of non-working slope in the first mining area of Beishan Coal Mine is analyzed by using FLAC3D finite difference software. The results show that, The strength parameter of weak mudstone decreases with time and the safety factor of slope decreases, which lasted for about 18 years and the slope safety factor is gradually reduced from 1.59 to 1.15, which is lower than the standard requirement.The results are as follows: Dynamic security prediction provides a theoretical basis.