摘要
针对空洞型采空区充填治理传统水泥浆泌水率高、结石率低、水料分散性大、治理成本高昂等问题,提出高浓度胶结材料充填治理技术。以风积砂为充填骨料,通过室内试验开展高浓度胶结材料强度、凝结时间、坍落度、分层度、泌水率、结实率等物理力学与流变特性测试,优选出满足强度与输送要求的材料配比;以陕北某工业广场下伏废弃小窑采空区治理为对象,通过钻探、钻孔窥视与三维激光扫描综合探查采空区,查明了采空区赋存状态及煤柱分布,定量计算出了采空区空洞与空隙体积,为采空区精准设计提供依据;根据采空区探查结果与高浓度胶结材料性能进行设计及充填治理,综合钻探取芯验证、充填结实体强度测试、场地变形监测3种手段,说明高浓度胶结材料充填达到了采空区治理设计要求,同时充填材料成本降低了32.5%,为空洞型采空区低成本、高效治理提供了新途径。
Aiming at the problems of traditional cement slurry such as high bleeding rate, low stone rate, high dispersion of water material and high treatment cost, the high concentration cementing material filling treatment technology was put forward. Aeolian sand was used as the filling aggregate, and the physical and mechanical properties of high concentration cemented materials, such as strength, setting time, slump, stratification, bleeding rate and setting rate, were tested in laboratory. The material ratio that meets the strength and transportation requirements was selected. Based on the treatment of abandoned small mine goaf under an industrial square in Northern Shaanxi, through drilling, drilling peeping and 3 D laser scanning, the occurrence state and coal pillar distribution of goaf were found out, and the volume of cavities and voids in goaf was calculated quantitatively, which provided basis for accurate design of goaf. According to the results of the goaf exploration and the performance of the high-concentration cement material, the filling design and filling treatment were carried out. The three methods of comprehensive drilling core verification, filling solid strength test and site deformation monitoring were demonstrated, indicating that the high-concentration cement material filling reached design requirements for goaf treatment, while reducing the cost of filling materials by 32.5%,providing a new way for low-cost and efficient treatment of cavitary goaf.
作者
许刚刚
王晓东
王海
邵红旗
曹祖宝
XU Gang-gang;WANG Xiao-dong;WANG Hai;SHAO Hong-qi(College of Architecture and Civil engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Xi'an Research Institute,China Coal Technology and Engineering Group,Xi'an 710077,China)
出处
《煤炭工程》
北大核心
2021年第11期73-80,共8页
Coal Engineering
基金
中煤科工集团西安研究院有限公司科技创新项目(2019XAYZD05,2019XAYMS11)。
关键词
高浓度胶结材料
空洞型采空区
三维激光扫描
充填治理
high concentration cemented material
cavitary goaf
3D laser scanning
filling treatment
