Local filling support structure and its construction method in goaf under hard roof condition

Abstract

Disclosed are a supporting structural body for local goaf filling under hard roof conditions and a construction method therefor, belonging to the technical field of stratum movement control in coal mining. The supporting structural body comprises an inner filling body (4) located in a goaf, and a lateral supporting body and an isolation body which are located on two sides of the filling body (4), wherein the lateral supporting body comprises a concrete-filled steel tube pier (2), an anti-tilt supporting leg (3), and a flexible yielding structure (8); the concrete-filled steel tube pier (2) serves as a main supporting structure, and is made by pouring concrete grout into a seamless steel tube; the anti-tilt supporting leg (3) is arranged at the middle of the concrete filled steel tube pier (2); and the isolation body comprises a gangue bag wall (7) built between adjacent concrete filled steel tube piers (2), a flexible lateral protection steel plate (6) erected next to the concrete-filled steel tube pier (2), and a waterproof plastic curtain (5) hung on one side of the flexible lateral protection steel plate (6). By means of the supporting structural body for local filling and the construction method therefor, sufficient and long-term supporting resistance can be provided, in a goaf, for an overlying strata roof, and especially for a hard roof stratum, ensuring that a central "elastic core region" of the structure remains 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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