条带矿柱破裂区宽度影响因素敏感性正交方差分析

为研究矿柱破裂区宽度影响因素的敏感性,以上横山矿床V3矿体为研究对象,基于正交试验原理,选取采深、采厚、条带采宽、矿体力学参数以及矿体倾角等为主控因素,设计21个不同的模拟试验方案,根据相应的模拟试验方案建立矿床数值模型并对矿床进行模拟开采;运用FALC3D自带的fish语言编写莫尔库仑屈服接近度(YAIm-c)函数来模拟计算矿柱的破裂区宽度;对破裂区宽度模拟结果进行正交方差分析得到:采深对破裂区宽度的影响显著,条带采宽、采厚对破裂区宽度影响不显著;矿体抗拉强度对破裂区宽度的影响显著,抗拉强度、黏聚力、内摩擦角对破裂区宽度的敏感性主次顺序为抗拉强度内摩擦角黏聚力。研究结果表明:采深越大,矿柱破裂区宽度越大;矿柱破裂区宽度与抗拉强度呈反相关。研究结果对估算矿柱破裂区宽度及安全评价矿柱稳定性具有重要的工程意义。

Orthogonal Test and Variance Analysis for Sensitivity of Factors Influencing the Width of Fractured Zone of Strip Pillar

In order to study the sensitivity of factors influencing the width of fractured zone of strip pillar,and regarding the V3 ore body as an object of investigation in Shanghengshan Mine,there are some these that are selected as main controlling factors,such as the mining depth,seam thickness,strip mining width,mechanics parameters of ore body and dip angle of ore body. 21 different simulation test plans were designed. Many a different numerical model was built with kinds of simulation test plans,and extracted the deposit models. The Mohr Coulomb yield approach index( YAIm-c ) function was written by fish lan-guage in FLAC3D ,which was applied to calculate the width of fractured zone of strip pillar. The rupture zone width of calculated results were dealt with orthogonal analysis of variance show that the mining depth has a significant influence and strip mining width,seam thickness have non-significant influence on the width of fractured zone. In rock mass mechanics parameters,tensile strength displays significantly,and cohesion,internal friction angle show not. The results show that the sensitivity sequence of influencing factors is as follows:tensile strength,internal friction angle and cohesion. The study shows that mining depth has the direct influence and tensile strength has the inverse influence on the width of fractured zone. The results of the study have im-portant engineering significance to estimate the width of fractured zone and safely evaluate pillar stability.