钠盐改性铝基高固水材料在矿山老巷充填治理中的适应性研究

Study on the Adaptability of Sodium Salt Modified Aluminum-Based High Solid Water Material in the Filling Treatment of Abandoned Mine Roadway

针对工作面推采过老巷过程中面临的冲击地压、顶板管理等难题,研发了钠盐改性铝基高固水材料,可用于矿山井下老巷(空区)的充填治理。为探究该材料在矿山老巷原位充填治理中的适应性,采用室内试验、数值模拟、工程验证等方法,分析了该材料在老巷治理中的优势,给出了老巷在不同充填条件下围岩应力特征及变形破坏规律。研究表明:该材料单浆不凝固,混合料浆在4~15 min内初凝,1 d充填体强度可超过最终强度的70%,早强性明显、流动性好、密闭状态下充填体稳定性高、具有较高的固水性能;对老巷进行充填后,帮部煤体内应力峰值较未充填时降低,峰值位置向浅部转移,塑性区范围和围岩变形量减小;工程现场按水灰比8∶1进行充填,料浆输送距离超过1100 m,速凝性、早强性明显,充实率和接顶率高,冲击地压等各类灾害均得到有效控制,证明该材料可较好地适应于矿山废弃巷道治理。

Aiming at many problems such as rock burst and roof management in the process of working face mining through abandoned roadway,a sodium salt modified aluminum-based high solid water material was developed,which can be used for filling treatment of abandoned roadway(goaf)in underground mine.In order to explore the adaptability of this material in the in-situ filling treatment of abandoned mine roadways,the advantages of this material in the treatment of abandoned roadways were analyzed by means of indoor tests,numerical simulation and engineering verification.The stress characteristics and deformation and failure laws of surrounding rocks under different filling conditions were given.The research results are concluded as follows.Firstly,the single slurry of the material is not solidified,and the mixed slurry is initially solidified within 4-15 min.The strength of the filling body at 1 d can exceed 70%of the final strength.It has the characteristics of obvious early strength,good fluidity,high stability of filling body in closed state,and high water retention performance.Secondly,after filling the abandoned roadway,the peak stress in the surrounding rock is lower than that without filling,the peak position is shifted to the shallow part,and the plastic range and the deformation of the surrounding rock are reduced.Thirdly,the project site is filled with the water-cement ratio of 8∶1,and the slurry transportation distance is more than 1100 m.The quick setting and early strength are obvious,and the filling rate and roof-contacted filling rate are high.Disasters such as rock burst have been effectively controlled.It proves that the material can be well adapted to the treatment of abandoned mine roadways.