煤炭采空区对水库渗漏影响研究

Research on impact of coal goaf on reservoir leakage

结合咸阳市某拟建水库的工程地质条件及采空区赋存状况,通过现场试验,探查了采空区边缘裂隙带分布特征,在分析采动对岩体完整性及渗漏性影响的基础上,评价了采空区的稳定性及其对水库渗漏性的影响。评价结论认为,水库水体荷载不会引起采空区"活化",采空区对拟建水库渗漏影响较小。现阶段,采空区引起的水库增加的极限渗漏量为1 004.41 m3/d,约占水库设计年平均流域径流量的0.87%,随着时间推移,采空区将逐步趋于稳定,渗漏量将逐步降低。鉴于此,建议对采空区加强监测。

Combined with the engineering geological conditions of a reservoir and a coal goal occurrence conditions in Xianyang City, through field test, the distribution characteristics of fracture zone of the goaf edge was explored, and by analyzing the impact of mining on rock mass integrity and leakage, the stability of the goal and its influence on reservoir permeability was evaluated. The results showed that the load of reservoir water would not cause ＂activation＂ of the goaf; the influence of the goaf on the leakage of reservoir is small. At the current stage, the increased ultimate leakage of the reservoir caused by the goaf is 1004.41 m^3/d, accounting for 0.87% of the designed annual average runoff of the reservoir. The goal will become stable gradually, and the leakage volume will reduce with time. In view of this, it is suggested that the monitoring of mined out area should be strengthened.