Study on law of in movement and deformation under downward mining in contiguous coal seams
Lyu Zhaohai
Zhao Changhong
Yue Xiaojun
Li Libo
Jin Hua
Zhu Haiyu
Abstract：In order to study the formation,mnovement,and energy exchange of the broken roof in the process of mining contiguous seams,a two-dimensional physical simulation model was built.Based on integrated monitoring of total station instrument,dial gauge and thermal infrared imagine,as well as theoretical analysis the causes of broken roof structure and its characteristics of rock mass development.The results show that during downward mining in close-distance seams,the damage depth to the secondary seam is 10.05 m;mining the third coal seam will caused induced disturbance on the stability of the strata,and subsidence amount is 0.39 m;the height of broken roof seam is 21.9 m.The conclusion is made that the load of support is composed of static load and dynamic load when disturbance from broken roof structure is at present.To ensure the support strength at the working face,the support resistance of the hydraulic support and setting load should be increased.To improve the integrity and bearing capacity of broken loose layer,an artificial roof can be made by applying steelwire reinforcement,or pre-grouting to stabilize and solidify the roof.
Keywords：overlying coal seamdownward miningcontiguous seamsbreaking roof seam
Publication Date：2017-01-01
Pages：6( 18-22,32 )