刘庄煤矿西一轨道石门俯角孔穿层钻孔排水技术应用

雷贺 贺正茂

摘 要：因孔底积水，下斜钻孔的孔内瓦斯不能及时被抽出，孔内瓦斯瞬间涌出并积聚。揭煤预抽期间，刘庄煤矿西一轨道石门利用抽排一体化装置，开展了抽排孔内积水和瓦斯试验，并对试验原始数据进行了记录和搜集。试验结束后，技术人员对原始数据进行了整理、分析，并与原始抽排方法进行对比，发现使用该工艺后，抽采效果得到了明显的提高。俯角穿层钻孔排水技术的应用，减少了俯角孔内积水对抽采的影响，缩短了石门揭煤预抽时间，为揭煤期间瓦斯管理奠定了安全基础。

关键词：俯角穿层钻孔;俯角孔排水;抽采

中图分类号：TD712.6文献标识码：A文章编号：1003-5168（2020）17-0082-03

The Application of Drilling and Drainage Technology of Depression Angle Hole in Stone Gate of West No. 1 Track of Liuzhuang Coal Mine

LEI He HE Zhengmao

（Liuzhuang Coal Mine， China Coal Xinji Energy Co.， Ltd.，Fuyang Anhui 232600）

Abstract： Due to water accumulation at the bottom of the hole， the gas in the hole of the downward drilling could not be drawn out in time， and the gas in the hole instantly gushed and accumulated. During the pre-extraction of coal， stone gate of west No. 1 track of Liuzhuang Coal Mine conducted an experiment on water accumulation and gas in the extraction hole by using the integrated extraction and drainage device， and recorded and collected the original data of the experiment. After the test， the technicians sorted and analyzed the original data and compared it with the original extraction method， and found that after using this process， the extraction effect was significantly improved. The application of the drainage technology of the borehole through the depression angle reduced the impact of the water accumulated in the depression hole on the extraction， shortened the pre-drainage time of the stone gate coal mining， and laid a safe foundation for gas management during coal mining.

Keywords： depression angle through-hole drilling;depression angle drainage;drainage

西一軌道石门西临西一胶带、回风二石门及F22断层，北临9煤、8煤及其他所穿煤层，南临西一11-2煤胶带石门及西一11-2煤轨道石门，东临151101胶带顺槽外段，上方为151301工作面采空区及151101工作面采空区。该巷道设计长度为1 256 m，断面设计为直墙半圆拱形，掘进宽度为5 900 mm，掘进高度为4 550 mm，S掘=23.11 m2。该巷道含多层厚细砂岩，局部赋含砂岩裂隙水，掘进过程中正常涌水量为3.2 m3/h，预计最大涌水量为7.4 m3/h。

1 概述

西一轨道石门向前施工期间将由巷道底板揭露8煤，该次揭煤为采区首次揭开8煤。预计揭煤点标高为-740 m，煤厚为3.5 m。巷道距离8煤层顶板法距10 m前测定最大瓦斯压力0.44 MPa，最大原始瓦斯含量为4.174 3 m3/t，可解吸瓦斯含量为2.947 3 m3/t。

西一轨道石门掘进至距8煤层顶板法距7 m位置停头，2017年4月14日由地勘钻机队进点，施工穿层预抽钻孔作为区域防突措施。……