Establishment and application of drilling sealing model in the spherical grouting mode based on the loosing-circle theory  

作　　者：Hao Zhiyong Lin Baiquan Gao Yabin Cheng Yanying 

机构地区：[1]State Key Laboratory of Coal Resources & Mine Safety [2]School of Safety Engineering,China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》2012年第6期882-885,共4页矿业科学技术学报（英文版）

基　　金：supports provided by the State Key Basic Research Program of China(No.2011CB201205);the National Natural Science Foundation of China(No.51074161);the independent research of the State Key Laboratory of Coal Resources & Mine Safety(No.SKLCRSM08X03);the Youth Science and Technology Fund of China University of Mining and Technology(No.JGY101605)

摘　　要：There are quite a few studies that have been done on borehole sealing theory both domestically and internationally.The existing researches usually consider drilling of the surroundings as a dense homogeneous elastic body which does not meet the characteristics of real drilling of the fractured body.Based on the loosing-circle theory and analyses of the surrounding rock stress field,cracks and seepage fields,combined with Newtonian fluid spherical grouting model,we deduced the dynamic relationship between the seepage coefficient and rock or grouting parameters of the drilling sealing fluid mode of spherical fissure grouting.In this experiment,mucus was injected in the simulated coal seam and the permeability coefficient of the sealing body was calculated by using the model.To verify the validity of the model,the calculated sealing body number was compared with the extreme negative pressure that the sealing body could withstand.The theoretical model revealed the drilling sealing fluid mechanism,provided a method for the quantitative calculation of the drilling sealing fluid effect by grouting mode and a reference for the subsequent research of sealing mechanism.There are quite a few studies that have been done on borehole sealing theory both domestically and internationally.The existing researches usually consider drilling of the surroundings as a dense homogeneous elastic body which does not meet the characteristics of real drilling of the fractured body.Based on the loosing-circle theory and analyses of the surrounding rock stress field,cracks and seepage fields,combined with Newtonian fluid spherical grouting model,we deduced the dynamic relationship between the seepage coefficient and rock or grouting parameters of the drilling sealing fluid mode of spherical fissure grouting.In this experiment,mucus was injected in the simulated coal seam and the permeability coefficient of the sealing body was calculated by using the model.To verify the validity of the model,the calculated sealing body number was compared with the extreme negative pressure that the sealing body could withstand.The theoretical model revealed the drilling sealing fluid mechanism,provided a method for the quantitative calculation of the drilling sealing fluid effect by grouting mode and a reference for the subsequent research of sealing mechanism.

关 键 词：DRILLING SEALING Loosing-circle GROUTING 

分 类 号：TD311[矿业工程—矿井建设]