摘要
为探究杨村煤矿下组煤带压开采底板断层阻渗性,选择10603工作面运输平巷掘进中揭露的一条典型断层为对象,采用现场压渗试验方法进行研究。通过对断层带初次压渗和2次重复压渗条件下注水水压、流量和监测水压随时间变化特征分析,获得不同压渗条件下起始导渗水压和稳态渗流水压的量化参数,发现现场压渗试验过程可分为未导渗、裂隙渗流扩展和稳态渗流3个阶段。在此基础上,概化计算该断层测试段岩体在3次压渗过程中的渗透系数,通过对比分析发现3种压渗条件下的渗透系数变化规律基本一致,多次重复压渗后平均渗透系数相对于初次压渗的增加不太明显,揭示了重复压渗导致的测试段可能没有发生明显的结构性渗透破坏。研究结果对杨村煤矿下组煤底板断层突水危险性评价具有重要参考价值。
In order to research the impermeability of the floor fault in the lower coal group in Yangcun Coal Mine by mining above confined aquifer,a typical fault was selected to carry out the permeability by field water injection test,where the fault was exposed by the transport roadway in No.10603 working face.Water injection pressure,flow rate and observation water pressure were analyzed for the fault zone under the initial field water injection test,the first and second repeated field water injection test.The quantization parameters of initial seepage water pressure and steady seepage water pressure were obtained under different field water injection test conditions.It was found that the whole test process could be roughly divided into three stages:no seepage stage,seepage development stage and seepage stability stage.Based on those three stages,the permeability coefficients of the tested fault rock mass were calculated and the variation laws of permeability coefficients were basically consistent under three different field water injection test conditions.The increasing tendency of the average permeability coefficient was not obvious after repeated water injection test compared with that of the initial water injection test.It revealed that no obvious structural seepage damage was formed in the test section by repeated water injection tests.The research results brought an important reference for water inrush risk assessment of lower coal group floor fault in Yangcun Coal Mine.
作者
曹思文
胡东祥
张民
孟凡贞
朱术云
CAO Siwen;HU Dongxiang;ZHANG Min;MENG Fanzhen;ZHU Shuyun(Yangcun Coal Mine,Yankuang Energy Group Company Limited,Jining,Shandong 272118,China;Department of Geological Survey,Yankuang Energy Group Company Limited,Zoucheng,Shandong 273500,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2023年第1期120-127,共8页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(41741020)。
关键词
下组煤
现场压渗试验
断层阻渗性
阶段性
渗透系数
lower coal group
field water injection test
impermeability of fault
stage
permeability coefficien
