A kind of whole mining process and ground stability test device and method in goaf subsidence area

Abstract

The invention discloses a whole mining process and a ground stability test device and method in a goaf subsidence area. On the inner side of the frame, a height-adjustable reaction force beam is installed on the top of the support frame, and the reaction force beam is connected to a sand showering device or a loading device; a sand filling recovery device is arranged at the bottom of the model tank; Two adjacent support plates are connected together and an electric lifting rod is installed at the bottom, and the lifting and lowering of the supporting plate is controlled by the electric lifting rod to realize the simulation of foundation uplift or settlement. The invention realizes the real-time monitoring of the foundation displacement of the whole goaf and its surrounding foundation soil in the process of mineral mining and the goaf being loaded, and can realize the uneven settlement of the bottom of the goaf caused by earthquake loads and the like, and the impact on the upper subgrade soil. and experimental simulation of surface impacts.

Description

technical field [0001] The invention relates to the field of mining engineering, in particular to a whole mining process and a ground stability test device and method in a goaf subsidence area. Background technique [0002] my country is a country with large mineral resources, which are rich in variety and widely distributed. With the continuous development of the economy, the demand for mineral resources is also increasing. Except for a small number of open-pit mines, most of the mineral resources, especially coal resources with abundant reserves, are located underground, and have the characteristics of large depth range and complex geological environment. During the mining process, due to the sudden release of in-situ stress, the foundations at the top of the goaf are subsidence and deformed, especially in areas with relatively broken strata, if the support is not timely, it is easy to induce collapse accidents. In addition, after the mining of minerals, there are a larg...

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Problems solved by technology

Although the commonly used test devices for goaf research can monitor the deformation and stress of the foundation, there are still the following problems to be solved: First, most of the existing devices are aimed at the study of the stability of the foundation within the range of the goaf after mining. There are few studies on foundation deformation and stability in China; secondly, although the visual model slot combined with photographing technology is used to monitor the deformation of the goaf, it is impossible to obtain continuous deformation monitoring of the foundation soil within the entire observation window; in addition, for foundation filling During the support of the goaf during the process, rubber air cushions are often used as temporary supports for the goaf. However, since the air cushion is a flexible material, it will inevitably produce irregular deformation, which is inconsistent with the modulus of the surrounding foundation filling, making the goaf prone to occurrence. The initial deformation, and the bottom of the current test device is fixed, so it is impossible to simulate the uneven settlement of the bottom of the gob

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