矸石散体塑性滑移的稳定性评价分析

Plastic slip stability analysis of gangue granular media

通过分析永荣韦家沟煤矸石山的堆积形态、水系地貌、自身结构等滑坡特征,研究了韦家沟煤矸石山的滑坡机制。利用塑性极限分析上限定理,以Bishop条分法为基础,建立极限状态函数,结合可靠性分析方法对韦家沟煤矸石山的安全系数及可靠度指标进行了计算。计算结果表明,塑性极限理论上限法考虑了土体内部的应力应变关系,公式推导上较为严格,且考虑矸石山固有的参数变异性,使稳定性计算结果更加合理。

This paper studies the landslide mechanism by the analysis of accumulation form, topography and geomorphology, self structure and natural river system of Weijiagou coal gangue hill. The limit state function is established based on plasticity mechanics limit analysis upper bound theorem and Bishop slices method, combining reliability theory. The safety coefficient and reliability index of Weijiagou coal gangue slope is calculated. The plasticity limit analysis upper bound theorem can consider the interior stress-strain relation of soil, so the formula derivation process is stricter. It is the consideration of the variability of gangue parameters that making the evaluation result more reasonable.