深部奥灰水特性及其浓缩后在奥灰水害防治中的应用

减少矿井水排放、降低底板注浆费用，以深部奥灰涌出水改性底板注浆材料为研究对象，测试了矿井水的常规离子、悬浮物、微量元素，研究了矿井水加热浓缩后的水质变化特征，对比测试了浓缩矿井水改性黏土浆液和水泥净浆的水理和物理力学性能，并基于改性黄土的膨胀界限抗渗强度设计实施了工作面注浆工程。研究结果表明:矿井深部奥灰水有高矿化度、富含悬浮物、其他特殊物质不超标、高永久硬度等特征，其浓缩后有利于改性浆液的钙离子、硫酸根离子、氯离子等富集，不利于浆液改性的碳酸氢根离子浓度降低，用于改性黏土浆液使得双电层结构絮凝，提高了土样抗压强度，降低了渗透性，用于改性水泥净浆，水泥初凝时间缩短，1,3,28 d强度分别提高1.7~3.3,5.3~7.7,8.3~17.1 MPa。改性后黄土膨胀界限抗渗强度提高了19.5%，应用工作面在减少16%的注浆量下安全回采了煤炭资源。

Characteristics of deep Ordovician limestone water and its concentrated application in Ordovician limestone water disaster prevention

In order to reduce mine water discharge and floor grouting cost,taking floor grouting material modified by deep Ordovician limestone gushing water as an example,the conventional ion,suspended matter and trace element in the mine water had been tested.Variation characteristic of mine water quality with heating concentration had studied,then the comparison tests on the water and mechanical properties of clay grout and cement grout modified by mine water had been conducted.And the grouting engineering of mining face had been designed and constructed by the modified loess margin of expansion.The results show that mine water in deep coal area are characterized with high salinity,rich suspended matter,limited special material and high permanent hardness.After the mine water is concentrated,it is beneficial to the enrichment of Ca2+,SO2-4,Cl-,etc.and the concentration of HCO3,which go against modified slurry,is decreasing.However,the double electrode layer of clay slurry modified by concentrated mine water flocculate,so the compressive strength of clay sample increases and the permeability of clay sample reduces.Initial setting time of cement paste modified by concentrated mine water is short,and the modified cement samples after 1d,3d,28d improve compressive strength by 1.7-3.3,5.3-7.7,8.3-17.1 MPa respectively.Modified loess margin of expansion increases 19.5%,and the applied coal working face had been mined safely with the grouting quantity reduction by 16%.