Experimental Research on Simulation Material for Water-Resisting Soil Layer in Mining Physical Simulation

Tao Yang,Jie Zhang

doi:10.1155/2020/3456913

Abstract

This paper focuses on the failure mechanism of a water-resisting soil layer with both coal excavation and seepage effect. Being taken the simulation principle of fluid-solid coupling as the research basis, we have established a new kind of experimental material for fluid-solid physical simulation (FPS). The material adopts river sand and clay as the aggregates, besides engine oil and low-temperature grease that are used as the gelatinizing agents. According to the relevant property testing on the experimental material, the mechanical parameters and seepage parameters of the material totally match the parameters of the soil layer, which satisfy requirements of the fluid-solid coupling experiment. Simultaneously, we have solved abundant material property problems, such as the material disintegration with water and visuality of water seepage in the simulation. Next, we have built up the FPS model to simulate coal excavation under water-bearing strata with the specific material. The results indicated that in the FPS, movement and failure mechanism of the water-resisting soil layer agree with the in-situ monitoring results. In addition, the revolution law of a mining-induced crack is also fitting the actual data. The mechanism of submarine seepage and its parameters on the material and the prototype are similar. All research results would be necessary for controlling mining-induced destroying of clay water-resisting property. Meanwhile, the model demonstrates that selection of the material and coupling parameters is valid. Finally, we can alter the material matching to obtain the layer materials with various characteristics, which would be applied in extensive experiments for studying soil layer failure and seepage simulation.

Highlights

Physical simulation as an experimental methodology combining simulation theory and dimensional analysis was put to solve mining problems by Kuznetsov innovatively
As we know that fluid-solid coupling is an interaction between fluid and solid in geotechnical engineering. e coupling effect contains deformation and failure of the rock and soil and flow characteristics from the fluid. erefore, we mainly study the evolution mechanism of mechanical behavior and seepage trait after rock and soil failure with fluid flowing [2, 3]
We studied the mechanism on fluid-solid coupling by theoretical analysis and numerical simulation

Summary

Introduction

Physical simulation as an experimental methodology combining simulation theory and dimensional analysis was put to solve mining problems by Kuznetsov (former Soviet Union) innovatively. As we know that fluid-solid coupling is an interaction between fluid (water) and solid (rock and soil) in geotechnical engineering. An accurate mechanism on fluid-solid coupling can control failure of water-resisting soil layer by mining excavation [4]. In the fluid-solid physical simulation with multifactors, we need a design fluid feature in the research course but not general simulation by only solid material. The specific experimental material would be necessary for the fluid-solid coupling simulation. A few scholars including Jacoby and Schmeling [5], Wiens et al [6], and Kincai and Olson [7] and the Yangtze River Water Resources and Hydropower Research Institute have attempted fluid-solid simulation with paraffin. Erefore, the stability and integrity of the red layer will determine the water inrush during the coal seam mining process

Simulation Principle of Fluid-Solid Coupling

Simulation Material Selection

Material Experiment Analysis

Simulation Model Analysis