Henan’an, China
Henan’an, China

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Hui G.-L.,China University of Mining and Technology | Hui G.-L.,Pingdingshan Coal Mining Group | Niu S.-J.,China University of Mining and Technology | Jing H.-W.,China University of Mining and Technology | Wang M.,LIAONING Technical University
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2010

In order to study the deformation rules of god-side roadway subjected to dynamic pressure with different support forms under a certain coal-pillar width, the newly developed comprehensive simulation test bench for underground engineering and the digital photogrammetry and correlative analysis technology are used to study the whole process of deformation-failure of surrounding rock of god-side roadway subjected to dynamic pressure under different supporting forms such as non-supporting, roof bolting with bars, wire mesh supporting, and steel shed supporting. The results indicate that the surface displacement of the solid-coal roadway without supporting includes three stages, which are accelerated deformation, slow deformation, and secondary accelerated deformation; the deformation volume of the surrounding rock in the mining stage is much larger than the deformation value in the driving stage for the god-side roadway subjected to dynamic pressure, and the bulking of coal mainly takes place in the driving stage for the zone reinforced by roof bolting, the peripheral displacement of roadway is caused by the deformation of the deep coal in the mining stage; the intensity mining stage is difficult to support. Moreover, the roof bolting with bars and wire mesh supporting technology is more suitable than the steel shed supporting.


Sun X.,China University of Mining and Technology | Lin B.-Q.,China University of Mining and Technology | Dong T.,China University of Mining and Technology | Hui G.-L.,Pingdingshan Coal Mining Group | And 3 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2010

The technique and prevention status of coal and gas outburst are summarized to put forward the theory of overall stress-relief. The technology of deep crossing-hole controlled hydraulic blasting is developed and applied in head-cutting, which combines and takes advantage of explosive power and water power. The results show that the technology can be applied to the seams with potential outburst and the risk of rockburst, which can connect with the drilling holes and the fractures, discharge the methane in coal seam, and eliminate methane pressure. Compared with the common deep-hole controlled blasting, this technology has a multiplying effect on pressure relief and enhancement of permeability under the same or similar conditions. After this technology being carried out in No. 31010 tunnel of the 15 th seam, the mining safety has been significantly improved and the tunneling speed accelerated obviously. Therefore, the application of the technology provides a new technical measure for safety mining under the condition of high gas contents, high in-situ stress, and low-permeability seams, which is significant in both economy and social effect.

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