Simulation and forecast evaluation method for delaying water inrush by mine fracture structure

Abstract

The invention discloses a simulation and forecast evaluation method for delaying water inrush by a mine fracture structure, comprising the follow steps: (1) putting forward an analysis method that mechanism for delaying water inrush, inoculation process and fracture structure hydraulic properties change with the time going because of the action of mining engineering under the condition of hydrogeological parameter variation due to stress strain redistribution; according to the water-rock interaction theory, analyzing circulation process of mutual action and mutual influence among stress, strain and permeance performance of the substances in fracture zone, and the genesis mechanism for hydraulic property conversion under the disturbance of the mining engineering; (2) according to the coupling rule of the mechanics parameters and the hydraulics parameter of the rock body, putting forward a rheology-seepage coupling simulation evaluation method under the variable parameter condition. The rheology-seepage coupling simulation evaluation method under the variable parameter condition builds the variable parameter rheology stress field and the seepage field coupling model by virtue of complying with the coupling rule of the mechanics parameters and the hydraulics parameter of the rock body, considering the substances in the fracture zone as rheopectic material, and basing on the rheological model of the rock body under the variable parameter condition.

Description

technical field [0001] The invention relates to a mine fault structure water inrush simulation prediction evaluation method, in particular to a mine fault structure delayed water inrush simulation prediction evaluation method. Background technique [0002] Mine water inrush is a serious underground disaster accident, which brings great harm to the mining of mineral resources, and causes a large number of economic losses and casualties every year. According to statistics, water inrush accidents related to fault structures account for 85% of the total water inrush accidents in my country, and with the increase of mine mining depth and the mining of lower coal groups, delayed water inrush accidents in fault zones with lag characteristics in time are becoming more and more serious. more and more. Delayed water inrush in the fault zone means that no signs of water inrush are found when the mining face touches or is close to a certain fault zone, but after a period of time after t...

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Problems solved by technology

The first two methods are mainly based on the study of water inrush mechanism based on classical mechanical theory, but they have great limitations in the analysis of water inrush process and the determination of water inrush time; the latter method is based on the analysis of various water inrush It is a semi-empirical model determined by the comprehensive analysis and evaluation of risk influencing factors, which cannot even be called a mechanism study in a sense; (4) The previous understanding of water inrush in fault structures was to divide fault structures into water-conducting or water-repelling There are two types of faults, that is, if the mining face touches or approaches the water-conducting fault zone, water inrush or well flooding accidents will occur; if the mining face touches or approaches the water-resisting fault zone, no water inrush accidents will occur , the mining face can normally excavate forward

[0004] Although domestic and foreign scholars including the applicant have realized the delayed water inrush phenomenon in fault structures in recent years, and found that fluid-solid coupling plays an important role in simulating the water inrush process in fault zones, the application of this theory is limited to The elastic-plastic strain-seepage coupling simulation under the assumption that the fault zone material is an elastoplastic material and the rheology-seepage coupling simulation under the assumption that the fault zone material is a rheological material, while for considering stress-strain redistribution resulting in hydrogeological parameters The analysis of the occurrence mechanism and gestation process of delayed water inrush under changing conditions, the change of hydraulic properties of fracture structures over time due to the action of mining engineering, the evaluation of rheological-seepage coupling simulation with variable parameters, and the research on the prediction of delayed water inrush time are in the domestic market. There are few reports

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