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《Coal Science and Technology》 2014-07
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Study on Features of Surface Dynamic Movement and Deformation Caused by Coal Mining Under Thick Alluvium

LI De-hai;XU Guo-sheng;YU Hua-zhong;Institute of Energy Science and Engineering,Henan Polytechnic University;Institute of Safety Technology Training,Henan Polytechnic University;  
In order to protect of buildings and control the ground subsidence in the area of covering thick alluvium,based on the measured data of surface movement and deformation above No. 11011 working face of Zhaogu No. 1 Coal Mine,dynamic changes of surface subsidence curve,surface subsidence maximum velocity,surface movement and deformation duration and lagging distance of maximum subsidence velocity were analyzed with mining under thick alluvium. The results indicated that rapid changes in value of surface subsidence appeared,maximum of subsidence velocity was 24. 5 mm /d,movement was intense and range of surface subsidence increased obviously. The surface subsidence coefficient expected was more than one in case of full extraction. In the surface movement duration,active phase accounted for53. 4% the total time,while 91. 3% the total subsidence occurred in this period,and decline phase of surface subsidence lasted for a long time,but had a litter subsidence. The working surface of maximum subsidence velocity lag distance was 182 m. The above resluts showed that with the coal mining under thick alluvium,the surface had a several features,for example,subsidence was sensitive to coal caving effect,surface subsidence velocity and coefficient was large,and surface movement was serious,and decline phase of surface subsidence lasted for a long time.
【Fund】: 河南理工大学博士基金资助项目(B2014-056)
【CateGory Index】: TD325.4
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