摘要
基于现场3307厚煤层综放工作面沿空留巷的工程实际,运用理论分析和FLAC3D数值模拟的方法,对3307综放工作面回采期间沿空巷道巷旁充填体的应力分布和变形特征进行了研究,结果表明:1)经叠加连续层板模型计算得到巷旁充填体的支护阻力P=11.23MPa;2)随综放工作面推进,巷旁充填体受到的垂直应力、水平应力和剪切应力均呈现先增大后稳定的规律,且在巷道侧到采空区侧的分布范围内,垂直应力、水平应力和剪切应力均呈现出非对称的分布特点;3)随综放工作面推进,巷旁充填体垂直变形和水平变形也均呈现出先增大后稳定的规律,巷旁充填体垂直变形呈现出沿空巷道侧垂直变形小、采空区侧垂直变形大的非均匀下沉特点,而两侧的水平变形则均呈现出上部变形严重、下部变形缓和的非均匀变形特点;4)巷旁充填体的应力分布、变形特征与厚煤层综放工作面顶板的初次破断和周期破断存在一定关系。本研究可为类似条件矿井的沿空留巷工程应用提供一定的借鉴意义。
Based on the application of retained gob-side entry in fully-mechanized face 3307,the stress distribution and deformation characteristics of roadside backfill body have been studied through theoretical analysis and FLAC3 D numerical simulation during the mining of fully-mechanized caving face in thick coal seam.The results are as follows:1)the support resistance of the roadside backfill body is analyzed and calculated,and the support of roadside backfill body is obtained,P=11.23 MPa by superimposed continuous layer plate model.2)The vertical stress,horizontal stress and shear stress of the roadside backfill body are increasing and eventually maintaining constant with the continuous advance of the working face.The distribution of vertical stress,horizontal stress and shear stress are asymmetric from gob to entry.3)The subsidence of the top and the horizontal deformation of both entry side and gob side of the roadside backfill body also show a trend of increasing and eventually maintaining constant with the continuous advance of the working face.The distribution of the top subsidence of the roadside backfill body shows the characteristics of non-uniform subsidence,in which the side of roadway is small and the side of gob is large.And the horizontal deformation of the roadside backfill body beside the roadway and the gob shows the characteristics of being slow at the lower part and severe at the upper part.4)The characteristics of stress and deformation of the roadside backfill body are directly related to the primary and periodic breaking characteristics of the roof of fully-mechanized caving face in thick coal seam.This study can provide some reference for the engineering application of gob-side entry in mines with similar conditions.
作者
冯国瑞
任玉琦
王朋飞
郭军
钱瑞鹏
李松玉
孙强
郝晨良
FENG Guorui;REN Yuqi;WANG Pengfei;GUO Jun;QIAN Ruipeng;LI Songyu;SUN Qiang;HAO Chenliang(College of Mining Technology,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Research Center of Green Mining Engineering Technology in Shanxi Province,Taiyuan,Shanxi 030024,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第6期1109-1119,共11页
Journal of Mining & Safety Engineering
基金
国家自然科学基金-山西煤基低碳联合基金重点支持项目(U1710258)
国家自然科学基金面上项目(51574172)
国家自然科学基金青年科学基金项目(51804209)
山西省重点研发计划项目(201803D31044)
关键词
综放开采
沿空留巷
巷旁充填体
应力分布
变形特征
full-mechanized caving mining
gob-side entry
roadside backfill body
stress distribution
deformation characteristics
