A goaf local filling supporting structure under a hard roof condition and a construction method thereof

Abstract

The invention discloses a goaf local filling supporting structure body under a hard roof condition and a construction method thereof, and belongs to the technical field of rock stratum motion controlin coal mining. The supporting structure body comprises a filling body located in the goaf, lateral supporting bodies disposed on two sides of the filling body and isolation bodies. Each lateral support body comprises a concrete filled steel tube pier column, an anti-falling supporting leg and a flexible yielding component. The concrete filled steel tube pier column is a main supporting structure.The concrete-filled steel tube pier column is manufactured by pouring concrete grout into a seamless steel tube, the anti-falling supporting legs are arranged in the middle of the concrete-filled steel tube pier column, and each isolation body comprises a gangue bag wall built between the adjacent concrete-filled steel tube pier columns, a flexible side protection steel plate erected in a mannerof being tightly attached to the pier column and a waterproof plastic curtain hung on one side of the steel plate. Sufficient and long-term supporting resistance can be provided for overlying rock roofs, especially hard roofing rock stratums, in the goaf, and it is guaranteed that an elastic nuclear area exists in the center of the structure for a long time.

Description

technical field [0001] The invention belongs to the technical field of rock motion control in coal mine mining, and in particular relates to a support structure body and a construction method thereof for partial filling of a goaf under the condition of a hard roof. Background technique [0002] After the mining of coal mines, due to the subsidence of the overlying rock strata, it often causes the subsidence of the surface, forming a large-scale coal mine subsidence area, causing serious damage to the surface and groundwater resources of the mining area, the fertile land on the surface, and buildings and structures, which is not conducive to the resources of the mining area. Coordinated development with the environment. In the process of coal mining, it is inevitable that the surface subsidence is caused by adopting the total caving method to deal with the mining process of the goaf. At the same time, due to the subsidence of coal mines, the "three downs" (under buildings, u...

AI Technical Summary

Problems solved by technology

The main reasons are as follows: firstly, most of the current filling materials are mainly loose gangue or cemented gangue materials, which have relatively high compressibility and weak pressure bearing capacity; secondly, the goaf strip filling body has no lateral direction. Confining pressure support, under the greater pressure of the overlying strata, the filling body gradually fails plastically from the edge to the inside, the "elastic core area" gradually disappears, and eventually the overall instability and failure will occur. At this time, the overlying strata and even the surface will still produce Settlement deformation

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