煤与瓦斯突出过程中气压时空演化规律

doi:10.16285/j.rsm.2017.01.011

›› 2017, Vol. 38 ›› Issue (1): 81-90.doi: 10.16285/j.rsm.2017.01.011

煤与瓦斯突出过程中气压时空演化规律

张超林^{1, 2}，彭守建^{1, 2, 3}，许江^{1, 2}，耿加波^{1, 2}，杨红伟^{1, 2}，罗小航^{1, 2}

1. 重庆大学煤矿灾害动力学与控制国家重点实验室，重庆 400044；2. 重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室，重庆 400044； 3. 中煤科工集团重庆研究院有限公司，重庆 400037

收稿日期:2015-01-26 出版日期:2017-01-11 发布日期:2018-06-05
作者简介:张超林，男，1991年生，博士研究生，主要从事煤与瓦斯突出、煤层气开采等方面的研究工作。
基金资助:
重庆市基础与前沿研究计划项目(No. cstc2013jjB90001)；中国博士后科学基金资助项目(No. 2014M552323)；煤矿灾害动力学与控制国家重点实验室自主研究课题重点项目(No. 2011DA105287-ZD201203)

Temporospatial evolution of gas pressure during coal and gas outburst

ZHANG Chao-lin^{1, 2}, PENG Shou-jian^{1, 2, 3}, XU Jiang^{1, 2}, GENG Jia-bo^{1, 2}, YANG Hong-wei^{1, 2}, LUO Xiao-hang^{1, 2}

1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China; 3. Chongqing Research Institute of China Coal Technology and Engineering Group Corp., Chongqing 400037, China

Received:2015-01-26 Online:2017-01-11 Published:2018-06-05
Supported by:
This work was supported by the Chongqing Research Project of Foundations and Frontiers (cstc2013jjB90001); the China Postdoctoral Science Foundation (2014M552323) and the Independent Research Program for the State Key Laboratory of Coal Mine Disaster Dynamics and Control (2011DA105287-ZD201203).

摘要/Abstract

摘要： 煤与瓦斯突出是严重威胁煤矿安全生产的地质灾害之一。近年来，随着采掘深度不断增加，地应力与瓦斯压力不断加大，突出次数也日益频繁，同时由于煤矿井下开采活动，使煤岩体中地应力场发生变化，在掘进工作面或回采工作面前方形成由卸压区、应力集中区和原始应力区组成的三带，给煤与瓦斯突出的预防与治理带来更大的困难。以天府三汇一矿为工程背景，基于相似理论试验模拟了采动条件下的煤与瓦斯突出过程，并分析了突出过程中气压的时空演化规律。研究结果表明：突出的发展是煤体由突出启动点向周围逐渐破坏并抛出的过程，相对突出强度为8.79%，且突出过程具有阵发性，表现为煤体的间歇式多次抛出和气压的反复升降，其中突出口附近气压的升幅较大，达到69.2%，而远离突出口处气压表现为短时间内急剧下降，之后缓慢下降并逐渐趋于大气压；突出过程中气压等压面近似以突出口为中心呈球面分布，且气体解吸区域近似呈球壳状逐渐向外扩展，球壳的扩展速度约为130 mm/s，球壳附近气压梯度较大。

关键词: 煤与瓦斯突出, 瓦斯压力, 气压梯度, 时空演化, 物理模拟

Abstract: Coal and gas outburst is one of the most serious disasters in coal mining. In recent years, with the increasing of mining depth, the in-situ stress and gas pressure increase, and thus the coal and gas outbursts occur more and more frequently. At the same time, the in-situ stress in coal changes with mining activities; the “three zones” are formed, i.e, stress relaxation zone, stress concentration zone and original stress zone in the areas in front of the heading face and the working face, which brings more difficulties to the prevention and control of coal and gas outburst. Tianfu Sanhui No.1 mine is selected as an analysis example. The process of gas outburst is physically simulated according to the similarity theory, and the temporospatial evolution of gas pressure is discussed. It is shown that the development of outburst is a process of coal breakage in the cavity wall, which starts from the start part to the surrounding, with a relative intensity of 8.79%. Pulverized coals are thrown out intermittently and the gas pressure rise up and down in many times. The gas pressure close to the outburst mouth has a large change up to 69.2%, while it declines sharply with a short period at first then fall slowly to the atmospheric pressure far away from the outburst mouth. The isobaric surface distributes at the spherical center of outburst mouth during outburst. The gas desorption area expands outward with the shape of spherical shell and the expansion speed of spherical shell is about 130 mm/s, and the gas gradient nearby is greater.

Key words: coal and gas outburst, gas pressure, gas pressure gradient, temporospatial evolution, physical simulation

中图分类号:

TD 325

张超林，彭守建，许江，耿加波，杨红伟，罗小航, . 煤与瓦斯突出过程中气压时空演化规律[J]. , 2017, 38(1): 81-90.

ZHANG Chao-lin, PENG Shou-jian, XU Jiang, GENG Jia-bo, YANG Hong-wei, LUO Xiao-hang, . Temporospatial evolution of gas pressure during coal and gas outburst[J]. , 2017, 38(1): 81-90.

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煤与瓦斯突出过程中气压时空演化规律

Temporospatial evolution of gas pressure during coal and gas outburst

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