覆岩隔离注浆充填浆体泌水特性试验研究
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摘要
覆岩隔离注浆充填开采是建筑物下压煤开采的有效方法,充填过程中浆体在压力作用下将出现泌水,泌出水过多时不仅容易导致充填效率低,同时沁水有可能沿断层等结构面溢出,对井下安全生产造成一定影响。为了确定覆岩注浆层位内充填浆体的泌出水量,掌握充填粉煤灰浆体泌水特性与注浆压力之间的关系,采用电液伺服万能试验机和自行设计的粉煤灰浆体压缩仪开展试验研究。试验结果表明,在压力作用下,粉煤灰浆体会持续泌水,泌出速率逐渐降低,直至浆体被压实后停止;粉煤灰固水率随着压力的增加而减小,二者近似呈对数关系。基于试验结果,建立了充填浆体泌水量与注浆充填压力及充填层位深度的关系式。
Grouting filling mining with isolated overburden was an effective method for coal mining under buildings,slurry would bleed under pressure in the course of filling,and excessive bleeding water not only caused low filling efficiency,but also would overflow along the fault planes,which had influence on the safety mining.In order to determine bleeding water yield of slurry in grouting section of the overburden,and grasp the relationship between coal ash slurry bleeding properties and grouting pressure,the electro-hydraulic servo universal tester and self-designed coal ash slurry compression apparatus were used in the experimental research.The results showed that under the pressure effect,the coal ash slurry had a continuous bleeding,the bleeding rate decreased gradually and stopped until the slurry was packed down;fixed moisture rate of coal ash decreased with the increase of pressure,and the relationship between the fixed moisture rate and the pressure was found to be logarithmic.Based on the experimental results,the relation among the bleeding water yield of slurry,grouting filling pressure and the filling section depth was established.
Grouting filling mining with isolated overburden was an effective method for coal mining under buildings,slurry would bleed under pressure in the course of filling,and excessive bleeding water not only caused low filling efficiency,but also would overflow along the fault planes,which had influence on the safety mining.In order to determine bleeding water yield of slurry in grouting section of the overburden,and grasp the relationship between coal ash slurry bleeding properties and grouting pressure,the electro-hydraulic servo universal tester and self-designed coal ash slurry compression apparatus were used in the experimental research.The results showed that under the pressure effect,the coal ash slurry had a continuous bleeding,the bleeding rate decreased gradually and stopped until the slurry was packed down;fixed moisture rate of coal ash decreased with the increase of pressure,and the relationship between the fixed moisture rate and the pressure was found to be logarithmic.Based on the experimental results,the relation among the bleeding water yield of slurry,grouting filling pressure and the filling section depth was established.
引文
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[13]Xuan Dayang,Xu Jialin,Wang Binglong,et al.Borehole Investigation of the Effectiveness of Grout Injection Technology on Coal Mine Subsidence Control[J].Rock Mechanics and Rock Engineering,2015(6)
[2]许家林,轩大洋,朱卫兵等.部分充填采煤技术的研究与实践[J].煤炭学报,2015(6)
[3]许家林,轩大洋,朱卫兵.充填采煤技术现状与展望[J].采矿技术,2011(3)
[4]许家林,倪建明,轩大洋等.覆岩隔离注浆充填不迁村采煤技术[J].煤炭科学技术,2015(12)
[5]朱卫兵,赖文奇,许家林.粉煤灰与矸石粉压缩特性的实验研究[J].中国煤炭,2005(11)
[6]张庆松,高延法,田光辉.注浆减沉时浆液水的渗流规律研究[J].矿山压力与顶板管理,2002(2)
[7]Xuan Dayang,Xu Jialin,Wang Binglong,et al.Investigation of fill distribution in post-injected longwall overburden with implications for grout take estimation[J].Engineering Geology,2016(5)
[8]高延法.开采沉陷离层注浆减沉条件下的地表沉陷预计理论及方法[J].矿山测量,2002(2)
[9]乔伟,李文平,李小琴.采场顶板离层水“静水压涌突水”机理及防治[J].采矿与安全工程学报,2011(1)
[10]李凤荣,陈真富,王和志.煤层顶板离层水体分布规律及防治技术探讨[J].采矿与安全工程学报,2009(2)
[11]王成真,冯光明.超高水材料覆岩离层及冒落裂隙带注浆充填技术[J].煤炭科学技术,2011(3)
[12]魏长寿,刘文生,周宸.覆岩离层中充填体流动规律研究[J].中国科技信息,2007(23)
[13]Xuan Dayang,Xu Jialin,Wang Binglong,et al.Borehole Investigation of the Effectiveness of Grout Injection Technology on Coal Mine Subsidence Control[J].Rock Mechanics and Rock Engineering,2015(6)