不同形式正断层采动应力及瓦斯赋存规律研究  

Study on Mining Stress and Gas Occurrence Law of Different Normal Faults

作　　者：周洋 舒龙勇 刘学[1,2] 崔聪 马延崑[1,2] 张蒙蒙 ZHOU Yang;SHU Longyong;LIU Xue;CUI Cong;MA Yankun;ZHANG Mengmeng(China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Miningand Clean Utilization(China Coal Research Institute),Beijing 100013,China;Jiegou Coal Mine,Suzhou Coal Power(Group)Co.,Ltd.,Suzhou 235100,China)

机构地区：[1]煤炭科学技术研究院有限公司,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院),北京100013 [3]宿州煤电(集团)有限公司界沟煤矿,安徽宿州235100

出　　处：《煤炭技术》2023年第6期179-184,共6页Coal Technology

摘　　要：为了探究不同形式正断层的采动应力及瓦斯赋存规律,以界沟煤矿为工程背景,采用FLAC3D数值模拟研究了工作面过断层时的采动应力演化规律,通过在界沟煤矿西一采区进行现场测试,得出了不同类型正断层附近的瓦斯赋存规律。研究表明:正断层随着断裂带宽度的增大,断层带的影响范围也越大;断层带的卸压程度随断层倾角的增大,而逐渐变小,随断层落差的增大,而逐渐增大;阶梯式、地堑式、地垒式断层组合中间区域呈两边低中间高的应力分布规律,并且卸压程度要强于断层组合外侧区域;当煤厚突增发生在正断层上盘应力增高区附近时应力相对于非构造区域会增大约1.22倍,受叠加应力影响会出现应力集中现象;瓦斯含量与煤层厚度呈正相关关系,正断层附近煤层厚度与瓦斯含量总体呈现逐渐减小的趋势,并且断层落差越大断层附近的瓦斯含量和K1值就越小。当工作面推进到断层附近时应注意煤层厚度变化,加强瓦斯相关参数测试,提前预测风险,有针对性地做好防治措施。In order to explore the mining stress and gas occurrence law of different forms of normal faults,FLAC3D numerical simulation was used to study the evolution law of mining stress when the working face crosses the fault,through field test in the first mining area of west Jiegou coal mine,the gas occurrence rules near diferent types of normal faults are obtained.The results show that the influence range of normal fault zone is larger with the increase of fault zone width;the degree of pressure relief decreases with the increase of fault dip angle;with the increase of fault drop,it gradually increases;the stress distribution in the middle area of step,graben and barrier fault assemblage is low on both sides and high in the middle,and the pressure relief degree is stronger than that in the lateral area of fault assemblage;when the coal thickness surge occurs near the stress increase area of the normal fault hanging wall,the stress will increase by about 1.22 times compared with the non-structural area,and the stress concentration phenomenon will occur under the influence of superimposed stress;there is a positive correlation between gas content and coal seam thickness.the thickness and gas content of coal seam near normal faults generally show a trend of gradual decrease,and the larger the fault drop,the smaller the gas content and K,value near faults.When the working face advances to the vicinity of faults,it is necessary to pay attention to the change of coal seam thickness,strengthen the test of gasrelated parameters,predict the risk in advance,and take targeted prevention and control measures.

关 键 词：正断层 不同落差 数值模拟 煤厚变化 瓦斯赋存 

分 类 号：TD713[矿业工程—矿井通风与安全]