Method for preventing well wall from crack by dynamic earth layer reinjecting water

Abstract

A method for dynamically injecting water back into stratum and preventing the cracking of shaft wall features that the water injecting well is arranged on the ground for injecting the water back into the water bearing stratum to restore its water pressure and decrease the vertical force acting on shaft wall, so preventing the cracking and deformation caused by mining. Said water may be the underground water discharged by mining coal.

Description

technical field [0001] The invention relates to a method for preventing and controlling shaft wall rupture by dynamic back-injection of stratum water, and is especially suitable for the treatment and prevention of shaft shafts in mine construction projects, and prevents shaft wall rupture caused by mining activities in deep and thick topsoil layers. Background technique [0002] In recent years, shaft wall rupture disasters in thick topsoil have occurred successively in East China, which seriously threatens the normal operation of mines. Over the years, through the vigorous work of relevant domestic research institutions, some achievements have been made in the research on the causes of shaft wall rupture and the prevention and control work. In order to prevent the shaft wall from rupture, the technical routes that can be adopted are: ① "resistance", That is, by increasing the strength of the shaft wall material and increasing the thickness of the shaft wall to enhance the b...

AI Technical Summary

Problems solved by technology

Over the years, through the vigorous work of relevant domestic research institutions, some achievements have been made in the research on the reasons for shaft wall rupture and the prevention and control work. In order to prevent shaft wall rupture, the technical routes that can be adopted are: ① "resistance", That is, by increasing the strength of the shaft wall material and increasing the thickness of the shaft wall to enhance the bearing capacity of the shaft wall and withstand the joint action of horizontal and vertical loads; Subsidence change; ③ "Reduction", fill and reinforce the aquifer, reduce or even eliminate the compression of the soil layer, thereby reducing the vertical additional force and achieving the goal of well wall safety. According to this technical route, the currently used and Mature methods are well wall breaking and grouting, surface grouting to strengthen the aquifer, etc. However, according to the actual treatment situation, although the above method greatly reduces the compression of the aquifer in the grouting curtain during mining activities, the grouting The soil layer outside the slurry curtain will also settle due to the loss of water in the aquifer, which still produces a large vertical additional force on the well wall. Therefore, it is not a cure for the symptoms, and there are still hidden dangers in mining activities.

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