桃园煤矿Ⅱ4采区太原组灰岩含水层放水试验及其可疏放性评价

Dewatering Test and Discharge Ability Evaluation of Water-bearing Strata in Taiyuan Formation Limestone in Ⅱ4 Mining District of Taoyuan Coal Mine

为评价桃园煤矿Ⅱ4采区太原组灰岩含水层的可疏放性,在Ⅱ4采区井下放水试验资料基础上,采用MODFLOW软件建立了采区水文地质模型,对含水层参数进行优选,利用该模型对采区灰岩含水层的可疏放性进行评价,并与理论分析结果进行对比。研究结果表明:采区太原组灰岩平均渗透系数为2.45 m/d,储水率为2.58×10-4,太原组灰岩含水层富水性较好,数值法与理论计算结果均表明采区可疏放性较差,研究结果为采区下一步防治水方法的选择提供了依据。

In order to evaluate the discharge ability of the water -bearing strata in Taiyuan formation limestone in Ⅱ4mining district of Taoyuan Coal Mine, based on the underground dewatering test data in Ⅱ4 mining district, a hydro-geologicalmodel of the mining district was established with MODFLOW software, the parameters of the water - bearing strata wereoptimized, the discharge ability of the water-bearing strata in limestone in the mining district were evaluated with this model,and the results were compared with the theoretical analysis results. The research results showed that the average permeabilitycoefficient of Taiyuan formation limestone in the mining district was 2.45 m/ d and the specific storage was 2.58× 10^-4. Thewater abundance of the water-bearing strata in Taiyuan formation limestone was better, both the numeric and theoretical resultsshowed the discharge ability of the mining district was bad. The research results provided the basis for the selection of watercontrol methods in the mining district in the future.