摘要
现场压水试验是揭示深部岩土工程中岩体渗透性能的可靠方法,为探究深部煤层底板岩体的渗透性,采用钻孔高压压水测试手段,对兖州矿区某矿下组煤底板三段岩体进行了现场压水试验,获得了大量压水测试数据。结合渗透系数计算公式,对试验数据进行了分析,获得了不同深度及不同岩性岩体的渗透系数值及渗透系数与压力关系的概化模式。研究结果表明:岩体发生渗流时,测试水压和流量会发生突变。岩体的渗透系数-压力关系曲线在几何形态表现出明显的分段性,即可分为突变点前的平稳段和突变点后的线性变化段。压水结束后,岩体裂隙会发生闭合,且仍具有较强的抗渗性。
Water injection experiment is a particularly useful technique to determine the permeability of rock mass in deep geotechnical engineering. To probe the permeability of lower coal seam floor, high borehole pressure water injection experiment has been carried out to analyse the three segments of rock masses in one coal mine in Yanzhou, and numerous data have been obtained. Based on the formula of permeability coefficient as well as the analysis of the data, permeability coefficients of three segments of rock masses have been determined, and a generalized model has been established to describe the relationship between permeability coefficients and pressure. The results show that the test pressure and the water discharge will suddenly change when the hydraulic fracturing occurs. The curves of permeability coefficient and pressure are provided with a significant geometric segmentation, which is stable before mutation and linear after mutation. Fissures will restore to be closed after water injection experiment, and the rock masses still have strong anti-permeability.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2015年第4期651-657,共7页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2013CB036003)
江苏省普通高校研究生科研创新计划项目(KYLX_1401)
关键词
深部岩体
压水试验
渗透系数
概化模式
deep rock mass
water injection test
permeability coefficient
generalized model
