煤层底板突水水量预测及注浆改造技术

PREDICTION OF QUANTITY OF WATER INRUSH FROM COAL SEAM FLOOR AND ITS REINFORCEMENT TECHNIQUE BY GROUTING

以基岩裂隙水运移的基本理论Chezy定律为基础,建立承压水正常涌水量的数学模型,提出利用Lagrangian法计算涌水量,应用Bernoulli能量方程计算矿井突水量的公式。计算结果表明,计算突水量与实际突水量的相对误差仅1.04%。针对焦作矿区大部分矿井煤层底板发生突水的实际情况,提出采用底板含水层注浆改造,防止底板突水事故。注浆孔位置主要决定于裂隙的发育程度、裂隙的走向,而注浆孔间距取决于浆液的扩散半径。最后,分析注浆压力和注浆量等注浆参数,并研制高压止水器,可解决注浆钻孔提前出水止水的难题。

Based on the Chezy rule, which can describe crack water flow of bedrock, the mathematical model of confined aquifer is set up; and the formulae of water flow and water inrush according to Lagrangian method and Bernoulli energy equation are deduced. Calculating results indicate that the error of computed water inrush and actual in-situ water inrush is only 1.04%. Aiming at the situation of water from flooding to floor of coal seam at a majority of coal mines in Jiaozuo mining area, the method of reinforcement of floor aquifer by grouting to prevent water inrush disasters is put forward. The grouting holes are mainly arranged according to developing extent of fractures and its directions on the strike; and the spaces between grouting holes are determined by diffusing radius of grouting. Grouting parameters such as grouting pressure and grouting quantity are also analyzed; and high pressure water-stopping device is manufactured, which can solve the problem of water-stopping in advancing flow at grouting hole.