Simulation test device and test method of sand inrush

Abstract

The invention relates to the technical fields of sandy soil seepage failure and mine hydrogeological test, in particular to a test device and method for monitoring of a sand inrush process induced by mining and related engineering under a simulation test condition. Based on a mine water disaster comprehensive simulation system and test method for automatic mining with high water pressure and high stress (application number: 201010285897.9), the device consists of a variable sand inrush opening and sand stop plug module, a lateral water source replenishment module, a sand inrush process monitoring module and a sand inrush collection and test module, and is characterized in that sand inrush test conditions of different vertical loads, low-seepage cover coats of different thicknesses and characteristics, different initial boundary water heads, dynamically changing cone of depression, different water-containing sand layer thicknesses and grain composition and different sand inrush fracture sizes and gradient monitoring conditions for seepage damage range, sand inrush and water inflow, water head and hydraulic power in a sand inrush process can be provided, and meanwhile sand inrush testing parameters are acquired; the test method is characterized by being an infinite boundary-based water head control and vertical load adjustment and control method, a sand inrush range recognition method and a determination method for weight and volume of the sand inrush and the actual water inflow.

Description

technical field [0001] The invention relates to the technical field of sand seepage damage and mine hydrogeological tests, in particular to a test device and method for monitoring sand break processes induced by mining and related engineering under model test conditions. Background technique [0002] The process of loose sandy soil caving down along the cracks formed by mining and related projects or being carried into the underground goaf by water flow is called sand breaking. Once it occurs, it will block the roadway, bury equipment and endanger the lives of production personnel. The sand burst disaster is mainly caused by the high-intensity mining that destroys the thin bedrock above the coal seam and the adjacent water-resisting structure, causing the upper loose layer sand to enter the deeper space along the seepage cracks under the action of its own weight or water flow. Unconsolidated aquifer mining conditions in concealed coalfields. [0003] Sand collapse disasters...

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Problems solved by technology

[0005] The problem to be solved by the present invention is: on the assembled model, under the conditions of limited lateral deformation, variable sand layer thickness, vertical load, lateral seepage, stable head water supply, and controllable mining cracks, through monitoring and identification The hydraulic gradient distribution, deformation and damage range, and deformation and damage degree in the water-bearing sand layer during the start-up of sand burst, and the dynamic change characteristics of water-sand mixed flow density and pore pressure at the sand burst outlet, sand burst volume, and water burst volume are obtained. Provide basic data for sand burst research under geological and mining combination conditions

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