考虑粒径分级的排土场稳定性分析

摘要

为研究粒径分级对超高台阶排土场稳定性的影响，以弓长岭独木排土场为例，建立考虑粒径分级的2种边坡模型，利用有限差分软件———FLAC分析其稳定性，并研究散体物料粒径大小对稳定性的影响。结果表明：当考虑粒径分级或增加大粒径散体物料的含量时，排土场的安全系数明显增大。以此为依据，通过增加大粒径散体物料的含量和使散体物料按粒径由大到小沿排土场高度方向分层排放2种方法，进行排土工艺的改进，但需注意消除因粒径分级引起的坡内软弱层面。研究工作提供了2种有效的超高台阶排土场稳定性分析方案，对其他类似工程的研究具有重要的参考意义。%In order to study the effect of the particle size grading on the stability of super-high bench dump,and taking Dumu Waste Dump in Gongchangling Open Pit Mine as an example,two kinds of slope models of considering size grading are set up. On this basis,the finite difference software-FLAC is used to analyze the dump stability,and study the impact of the par-ticle size on the stability. The results indicate that:the size classification or the content increase of large particle size bulk mate-rial would increase apparently the safety factor of dump. Based on this conclusion,the dumping processes are improved by two approaches of increasing the content of large particle size bulk material and discharging the rock mass along the dump height according to the particle size from large to small. But the weak layers within slopes caused by the size classification need to be paid attention and be eliminated. This study provides two kinds of effective approaches for the stability analysis of super-high bench dumping and has important reference significance for other similar projects.