粗榆金矿地下开采覆岩运移规律数值模拟

Numerical Simulation on Overlying Strata Movement Law in Underground Mining of Cuyu Gold Mine

针对粗榆金矿急倾斜极薄矿体下行充填开采过程中岩移规律开展数值模拟研究.通过现场节理调查确定节理产状与间距,利用Hoek-Brown强度准则确定数值计算参数,借助神经网络获得数值计算边界条件,结合三种不同数值计算方法开展计算分析.研究表明,矿体上盘岩层沉降明显,矿体覆岩沉降变形区域呈筒形陷落;FLAC3D和3DEC计算结果显示,粗榆金矿地表不存在沉降区域;随机介质计算结果显示,二号竖井、新建的选矿厂以及职工宿舍浴池均在岩移带之外;相对于FLAC3D,3DEC计算方法,随机介质方法更适合对急倾斜极薄矿体开采导致的岩层运移进行模拟研究.

The numerical simulation on the stratum movement law during the downward fillingmining process of steep and extremely narrow orebody in Cuyu gold mine was carried out.The joint strike and spacing is determined through on site investigation.The Hoek-Brown strength criterion was used to determine the numerical calculation parameters,and the boundary conditions of numerical calculation was obtained by the neural network.The stratum movement law during underground mining of steep and extremely narrow orebody was carried out by three different numerical calculation methods.The research showed that the settlement of the rock mass on the upper part of the orebody is obvious,and the settlement area of the overburden rock in the orebody is cylindrically collapsed.According to the calculation results of FLAC3 D and 3 DEC,there is no settlement area on the surface in Cuyu gold mine.The No.2 shaft,the newly-built concentrator and the staff dormitory bath are all located outside the rock transfer belt based on the calculation results of random medium method.Compared with FLAC3 D and 3 DEC calculation,the random medium method is more suitable for simulating the rock strata movement caused by the steep and extremely narrow orebody mining.