摘要
针对沿空掘巷围岩控制中煤体硬度指标因素,展开中硬煤层条件下沿空巷道布置及支护参数的优化设置分析与研究,通过室内不同硬度煤体σ-ε、ε-t及σ-t实验,得出对应坚硬、中硬、较软—松软四种煤体硬度的本构模型依次为近弹性本构关系(非线性)、弹塑性本构关系、流变本构关系(蠕变—松弛本构关系)。基于中硬煤体的本构关系分析,采用FLAC^(3D)数值软件进行窄煤柱合理宽度及支护参数模拟分析,选取Hoek-Brown强度准则的Strain-Softening Model本构模型,研究非线性软化材料的变形规律,得出中硬煤体条件下沿空掘巷的窄煤柱留设宽度和最佳支护参数,取得了较好的围岩控制效果。
Based on coal hardness index in gob-side entry driving,gob-side roadway layout and support parameters under medium hard coal condition,coal body ofσ-ε、ε-t andσ-t was tested to get the 4 types coal body hardness mold were non-linear,elastic-plastic,evolvement.FLAC3D was applied to simulate the reasonable coal pillar width and support parameters,Strain-Softening Mode of Hoek-Brown was adopted to study deformation law of nonlinear softening material,the reasonable reserve-width of coal pillar and optimized support parameters under medium hard coal condition in gob-side entry driving,with good surrounding rock control effect.
作者
胥辉峰
Xu Huifeng(Shanxi Coking Coal Group Zhengxing Mining Industry Company,Xinzhou 036400,China)
出处
《煤炭与化工》
CAS
2017年第12期43-46,共4页
Coal and Chemical Industry
关键词
中硬煤层
沿空掘巷
本构关系
数值模拟
围岩控制
medium hard coal seam
gob-side entry driving
constitutive relation
numerical simulation
the surrounding rock control
