Fine Prediction for Mine Water Inflow on Basis of Visual Modflow

Wang Guorui

doi:10.11648/j.ogce.20190702.12

Abstract

Mine water inflow refers to the influx of mine within the mine construction and production process of water per unit time. The amout of water inflow is not only an important indicator of the technical and economic evaluation of mine construction and rational development but also the main basis for coal mining production design department to develop programs to identify and develop the ability to mine dewatering and drainage measures, playing an important role in preventing the accidents of mine water inrush and flooding mine malignant as well as reducing the production costs and protecting mine safety. In this paper, the way coal mining in northeast in china for points, by means of sequence numerical simulation compared to traditional separated mining area in calculating water inflow, then matches the results to the existing mine water inflow, to validate the model accuracy, improve the accuracy of the numerical simulation, to provide security for mining coal mine safety.

Highlights

Darcy discovered groundwater flow in porous aquifers is mostly considered to be laminar and named Darcy’s law, that is, by a linear relationship between specific discharge and hydraulic gradient [1]
The numerical simulation method has been widely used in mine water inflow forecast, providing important guarantee for coal mine safety production, the software Visual Modflow is included [5, 6]
A practical hydrogeological physical model is constructed based on Visual Modflow, and the simulation results of the two methods are compared with the actual situation so as to obtain the advancement, practicability and correctness of the numerical simulation of the mining area under the interference flow field according to the mining sequence

Summary

Introduction

Darcy discovered groundwater flow in porous aquifers is mostly considered to be laminar and named Darcy’s law, that is, by a linear relationship between specific discharge and hydraulic gradient [1]. Seyf-Laye et al applied a three-dimensional groundwater flow model to evaluate groundwater potential and assess the effects of groundwater withdrawal on the regional water level and flow direction in the central Beijing area [3]. The numerical simulation method has been widely used in mine water inflow forecast, providing important guarantee for coal mine safety production, the software Visual Modflow is included [5, 6]. ZHOU et al applied the Visual Modflow into simulating and evaluating the effect of groundwater resources in coal mining, making fully use of the model–bulid and forecast function of the software. WANG et al did deep research in faults effection on numerical simulation method of gielding water in mining area exploitation, creating an ideal model of the groundwater aquifer system with tool of Visual Modflow to study and explore the impact on underground water distribution and gielding water. By means of sequence numerical simulation compared to traditional separated mining area in calculating water inflow, matches the results to the existing mine water inflow, to validate the model accuracy and practicability, improving the accuracy of the numerical simulation, to provide security for coal mine safety

Geological Model

Mathematical Model

Results and Analysis

Prediction of Water Inflow in Separated Mining Areas

Prediction of Water Inflow According to Mining Sequence

Conclusions