CAJ | 학술논문

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.
현장압수시험시게시심부암토공정중암체삼투성능적가고방법,위탐구심부매층저판암체적삼투성,채용찬공고압압수측시수단,대연주광구모광하조매저판삼단암체진행료현장압수시험,획득료대량압수측시수거.결합삼투계수계산공식,대시험수거진행료분석,획득료불동심도급불동암성암체적삼투계수치급삼투계수여압력관계적개화모식.연구결과표명:암체발생삼류시,측시수압화류량회발생돌변.암체적삼투계수-압력관계곡선재궤하형태표현출명현적분단성,즉가분위돌변점전적평은단화돌변점후적선성변화단.압수결속후,암체렬극회발생폐합,차잉구유교강적항삼성.
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 rela-tionship 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.