基于钻孔压水试验的岩层阻渗能力研究  

STUDY OF IMPERMEABILITY OF ROCK STRATUM BASED ON WATER INJECTIION TEST

作　　者：黄震[1] 姜振泉[1] 曹丁涛[2] 李廷[3] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]兖州煤业股份有限公司,山东邹城273500 [3]兖州煤业股份有限公司鲍店煤矿,山东邹城272100

出　　处：《岩石力学与工程学报》2014年第A02期3573-3580,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2013CB036003)

摘　　要：现场压水试验是揭示岩层阻渗能力的可靠方法,以鲍店矿为背景,采用钻孔高压压水测试手段,对下组煤底板隔水层进行压水测试,获得底板3段岩层的压水测试数据并计算出底板岩体渗透系数。经过分析结果表明:不同岩性的渗透系数和压力的关系曲线均表现出明显的分段性,具有劈裂压力前的稳定性及劈裂压力后的线性变化性;渗透系数与压水流量具有较好的线性关系,继续增大流量,渗透系数有增大的趋势;可根据临界抗渗强度来评价底板岩层阻渗能力的高低,经计算得到底板岩体阻渗能力从高到低顺序为泥岩,粉细砂岩,细砂岩,灰岩。研究方法和结果可为矿区下组煤工作面的安全开采提供重要的参考依据。Water injection test is a particularly useful technique to determine the impermeability of rock stratum. Based on Baodian coal mine,the data of water injection test were obtained and permeability coefficient of floor rock were deduced through high pressure water injection test. Based on the analysis of data,the results show that the curves of permeability coefficient and pressure are provided with a significant segmentation,which is stable before fracturing pressure and shows linear relationship with high regression coefficient after fracturing pressure. The relationship between permeability coefficient and water discharge is close to linear. Results show that if water discharge continue to rise,the permeability coefficient tends to increase;the impermeability of floor rock stratum can be judged by the calculated results of the critical impermeability strength. The result of the impermeability from highest to lowest is mudstone,siltstone,fine sandstone,limestone. The results make a important reference for safety-mining of follow-up working face.

关 键 词：采矿工程 煤层底板 压水试验 阻渗能力 渗透系数 临界抗渗强度 

分 类 号：TD745[矿业工程—矿井通风与安全]