岩溶裂隙发育地层帷幕注浆材料性能及适用性研究

针对某矿区岩溶裂隙发育地层突水灾害帷幕注浆治理工程,开展适用于岩溶裂隙发育地层帷幕注浆材料的性能及适用性研究。通过室内试验对硅酸盐水泥单液浆、水泥-粉煤灰浆液、水泥-粉煤灰-黏土浆液基本性能以及最佳配比进行研究,并根据该矿区地层性质及帷幕注浆扩散方式要求,从材料性能、技术可行性、注浆过程控制、治理效果及经济环保性等方面系统研究了注浆材料适用性,对注浆实际工程材料选择提供参考及指导。研究结果表明:浆液水固比是影响浆液结石体强度、黏度、结石率、凝结时间等基本性能指标的主控因素,粉煤灰及黏土掺量配比也会影响复合材料基本性能参数。根据提出的注浆材料适用性评价方法以及不同配比不同类型材料性能参数,确定了不同区段注浆材料及配比等注浆参数,对该矿区突涌水进行了有效封堵。

Study on performance and applicability of curtain grouting materials in karst fractured stratum

Aiming at the grouting treatment project of water inrush disaster in the karst fractured strata in a coal mine in Huaibei mining area,a study on the performance and applicability of curtain grouting material suitable for the karst fractures developed strata was carried out. By conducting laboratory tests,the fundamental characteristics of Portland cement single-portion cement slurry,cement-fly ash slurry,cement-fly ash-clay slurry and the best mix ratio of them were studied. According to the stratum properties of the coal mine and the requirements of the curtain grouting diffusion mode,the applicabilities of grouting materials were studied systematically from the aspects of material property,technical feasibility,grouting process control,treatment effectiveness and economic environmental protection. It provides reference and guidance for the selection of engineering grouting materials. The results show that the slurry water-solid ratio is the main controlling factor that affects the basic performance indicators such as strength,viscosity,calculus rate and setting time of the slurry stone. The mixing ratio of fly ash and clay will also affect the basic performance parameters of the material. According to the proposed appraisal method for the applicability of grouting materials and the performance parameters of different types of materials with different proportions,grouting parameters such as grouting materials and mixing ratios in different sections were determined,and the inrush water in the mine area was effectively blocked.