基于模型试验的深部煤层合理停采线结构分析

发布时间：2018-02-25 01:11

本文关键词： 采矿工程声发射合理停采线开挖影响区数字散斑应变砖　出处：《岩石力学与工程学报》2017年10期 　论文类型：期刊论文

【摘要】：为分析合理停采线的结构,以存在深部煤层回采情况的济宁三号煤矿为背景,通过模型试验的方法,监测上方工作面回采过程中,垂直于回采方向的下方巷道围岩的扰动特征。试验过程中综合运用PAC声发射仪、静态电阻应变仪、数字散斑等仪器,得到下方巷道围岩声发射事件发展、应变量以及巷道整体变形量。模型试验监测相似材料试样单轴压缩过程中的声发射特征,发现声发射结果可以反映相似材料试样的破坏规律;认为停采线结构应包括受影响巷道的开挖影响区范围l_1、工作面回采的采动超前影响区范围l_2,以及避免两区域相互影响的最小安全间距l;通过监测上方工作面回采过程中,下方巷道围岩内的应变及声发射特征得到了l,l_1和l_2的范围,并通过数字散斑监测了上方工作面回采过程中下方巷道的整体变形量。
[Abstract]:In order to analyze the structure of reasonable stoppage line, taking Jining No. 3 coal mine with deep coal seam as the background, through the method of model test, the paper monitors the mining process of the upper face. The disturbance characteristics of surrounding rock in the lower roadway perpendicular to the mining direction. The acoustic emission events in the surrounding rock of the lower roadway were developed by using PAC acoustic emission instrument, static resistance strainer, digital speckle and so on. Model tests are used to monitor the characteristics of acoustic emission in the process of uniaxial compression of samples of similar materials, and it is found that the results of acoustic emission can reflect the failure law of samples of similar materials. It is considered that the structure of stop-stoping line should include the affected area of the affected roadway (l-1), the area of mining advance affected area (l2) of the mining face, and the minimum safe distance between the two areas to avoid the interaction between the two areas, and through the monitoring of the mining process of the upper face, The strain and acoustic emission characteristics in the surrounding rock of the lower roadway have obtained the ranges of L _ (l-1) and l _ (2), and the total deformation of the lower roadway in the mining process of the upper face has been monitored by digital speckle.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室;兖矿集团济宁三号煤矿;
【基金】：国家重点基础研究发展计划(973)项目(2014CB046902) 国家自然科学基金资助项目(51427803,51404240)~~
【分类号】：TD821

【相似文献】