黔北煤田长兴组离层水形成机理及综合防治技术研究

Technical Study on Formation Mechanism and Comprehensive Prevention and Control of Separated Layer Water in Changxing Formation of Qianbei Coal Field

为了解决长兴组灰岩含水层离层突水问题,分析了长兴组含水层水文地质条件,计算了4#煤层顶板残余碎胀系数,确定主关键层,基于关键层理论对其离层水形成和致灾机理进行了分析,并采取了一系列防治水工程,得出以下结论:(1)4#煤层导水裂隙带发育高度25~29 m;(2)长兴组含水层主要受顶板玉龙山段灰岩含水层越流补给,径流方向为NE;(3)4#煤层离层水发育主要受长兴组含水层控制,局部受到玉龙山段含水层影响。实践证明:有针对性地采取物探、钻探和排水系统改造的方法可以有效避免长兴组含水层离层水突水事故。

In order to solve the problem of water inrush from the separated layers of the limestone aquifer in the Changxing formation,the hydrogeological conditions of the aquifer in the Changxing formation were analyzed,the residual expansion coefficient of the roof of the No.4 coal seam was calculated,the main key layer was determined,and the formation and disaster mechanism of the separated layer water were analyzed based on the key layer theory.A series of water prevention and control projects were taken,and the following conclusions were drawn:(1)The development height of the water conducting fracture zone in the No.4 coal seam is 25-29 m;(2)The Changxing formation aquifer is mainly recharged by the overflow of the limestone aquifer in the Yulongshan section of the roof,with a runoff direction of NE;(3)The development of detachment water in coal seam No.4 is mainly controlled by the Changxing formation aquifer,and is locally affected by the Yulongshan section aquifer.Practice has proven that targeted methods such as geophysical exploration,drilling,and drainage system renovation can effectively avoid water inrush accidents in the Changxing formation aquifer.