Reduce and Stop Water Accident of the Working Face by Grouting Cement Mud to the Near Fault


Xu Ping

School of Water Environment, Zhengzhou University, Zhengzhou, Henan
450001, China

Tie Ying

School of Mechanical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China



The 6# working face of one coal mine of Henan Province in China is near a large fault, its water-resisting layer of floor is thinner and groundwater is abundant, the upper pressure is lost where the coal is mined-out, then the water-resisting layer of floor is fractured at the action of the powerful water pressure, and the lower underground water break through from the floor fracture into the 6# working face. In order to exploit the 1.0 million tons of coal near the 6# working face, cement mud is designed to grout into the fault to reduce and stop water. First of all, nine measuring lines are arranged parallel or perpendicular to F20 fault in the ground surface, the line spacing distance is 50m, and electrode spacing distance is 5.0~10.0m, and the underground lithological characters and accurate position of the joint line of F20 fault and 2-1 coal bed are surveyed according to the difference of electrical resistivity, then four holes named zk1 to zk4 are drilled which are 10~30 m south to the joint line, and better grouting effects of about 99.17% are obtained and the coal of 6# working face can be exploited again . And this paper provides references for dealing with the similar project that are paused by water accident.

Keywords: High density electrical method; water accident; coal floor; grouting; cement mud

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