老矿井冲积层防水煤柱留设方法探讨

 我国华北各煤田浅部资源日渐枯竭，许多矿井经多年回采，冲积层含水层水文地质条件被充分揭露和一定程度疏干，水害威胁相对减小。在保证安全开采的前提下，合理缩小、回采原冲积层防水煤柱是延长衰老矿井寿命、提高煤炭资源回采率的重要途径。本文以开滦荆各庄矿为例，根据规范计算、现场实测和数值模拟三种方法论证了当前开采条件下导水裂隙带高度，重新计算、留设了井田冲积层防水煤柱。冲积层防水煤柱高度由原来的60m缩小变为43m，解放原煤炭资源54.172×104 t；不仅延长了矿井服务年限，而且带来了社会和经济的双重效益。

Study on the size of Water-inrush Barrier from Alluvial Aquifer for Exhausteded Mines

Shallow coal resources have gradually been decreasing in North China. After years of mining, alluvial aquifer has been fully exposed and partial dewatered, water-inrush pressure has been reduced. Types of water-inrush barrier from alluvial aquifer are rationally reduced, which is an important way to extend the life of exhausting mine and improve the recovery ratio of coal resources. In this paper, taking Jing Gezhuang coal mine, in KaiLuan as example, we came to the value of height of water flowing fractured zone through comparing the consequences, which were respectivly got by basing on criterion, field measurement and numerical simulation. The value made the size of water-inrush barrer from alluvial aquifer sucessful in the east part of mine area, where the height of coal pillars changes 60m from 53.5m and the quantity of liberated coal is 20.713×104 t. Not only will it be to extend the service life of the mine, but also to bring social and economic benefit.