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研究深部岩溶裂隙含水介质渗透特性和富水规律对深部矿井安全开采具有重要意义.介绍了深部岩溶裂隙形成机理和裂隙岩体渗流运动的基本规律,结合不同现场多个钻孔进行了同一岩溶裂隙含水层在不同深度处的现场地面抽水试验和不同深度处岩层的地应力测试,同时在井下不同开采标高处对同一岩溶裂隙含水层进行了大量的单孔放水试验和涌水钻孔概率统计,得到了不同深度处的地应力值、渗透系数值、富水性指标(钻孔单位涌水量)、水压值、钻孔最大涌水量值和涌水钻孔概率.结果表明:水压值和地应力值都随埋深的增大而线性增加;钻孔最大涌水量和涌水孔率都随开采深度的增加而减小.岩溶裂隙含水介质的渗透系数和钻孔单位涌水量随地应力的增加都呈负指数规律减小;地应力增加导致岩溶裂隙张开度的减小,渗透系数减小,层流侵蚀水溶解石灰岩的能力减弱,进而使得深部岩溶裂隙含水介质的富水性变弱.不同地区的深部岩溶裂隙含水介质的渗透特性随地应力(垂向应力和平均水平主应力)的增加都呈负指数递减的规律.
It is of great significance to study the infiltration characteristics and water-rich law of deep karst fissure aqueous medium for safe mining of deep mines.The basic rules of deep karst fissure formation mechanism and seepage movement of fractured rock mass are introduced, and the same karst fissure Site ground pumping tests of aquifers at different depths and ground stress tests of rock formations at different depths. Meanwhile, a large number of single-hole water release tests and probability statistics of water inrush drilling have been conducted on the same karst fissure aquifer at different mining elevation levels. The values of in-situ stress, permeability coefficient, water-rich index (water inflow of drilling unit), water pressure value, the maximum water inflow value of borehole and the probability of gushing water drilling at different depths.The results show that the values of water pressure and in-situ stress Both increase linearly with the increase of burial depth.The maximum water inflow and gushing porosity decrease with the increase of mining depth.The permeability coefficient and gushing water volume of karst fissure aquifer are both negative The exponential law decreases; the increase of the in-situ stress leads to the decrease of the karst fissure opening degree and the decrease of the permeability coefficient, and the laminar flow erosion can dissolve the energy of limestone The weakened force makes the water-bearing capacity of aqueous media in deep karst fissures weakened.The permeability of deep aqueous karst fissures in different regions decreases negative exponentially with the increase of in-situ stress (vertical stress and average principal stress).