地下气化热-力耦合作用下短壁工作面长度的确定方法  

Determining Method for Length of the Shortwall Face with Thermal-Mechanical Coupling Effects of Underground Coal Gasification

作　　者：黄温钢[1] 王作棠[2] 邬书良[1] 霍亮[1] 张修香 严荣富[1] HUANG Wengang;WANG Zuotang;WU Shuliang;HUO Liang;ZHANG Xiuxiang;YAN Rongfu(School of Earth Sciences,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]东华理工大学地球科学学院,南昌330013 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《太原理工大学学报》2019年第2期153-159,共7页Journal of Taiyuan University of Technology

基　　金：中国矿业大学煤炭资源与安全开采国家重点实验室开放研究基金资助项目(SKLCRSM19KF0001);东华理工大学博士科研启动基金项目(DHBK2015322)

摘　　要：为控制燃空区顶板稳定性,提出了煤炭地下气化短壁开采设想。针对燃空区顶板处于高温和地应力耦合环境的特点,构建了地下气化短壁工作面的合理长度确定方法,并以贵州盘江某矿地下气化工程为例,对其短壁工作面合理长度进行了计算分析。结果表明:随着火焰工作面的推进,靠近顶板下表面0～3m处岩体温度先迅速上升、后逐渐下降,而3～10m处岩体温度则缓慢上升,温度在覆岩中的传播范围约为10m;燃空区直接顶承受的载荷和热应力在稳定了一段时间之后迅速上升,抗拉强度则先下降、后上升,导致直接顶的极限跨距先小幅下降、后急剧上升;气化短壁工作面的合理长度应小于直接顶极限跨距的最小值,由此确定贵州盘江某矿气化短壁工作面的合理长度为12m.该方法可为地下气化工作面长度设计提供理论指导。To control the stability of the roof of combustion space area(CSA),the concept of underground coal gasification(UCG)with shortwall mining method was put forward in this paper.According to the characteristics of the CSA roof in the coupled environment of high temperature and ground stress,we established a determining method for reasonable length of shortwall face of UCG and took a UCG project of a mine in Panjiang Group in Guizhou province as an example to calculate and analyze its reasonable length of shortwall mining.The results show that,with the advance of the flame working face,the temperature of rock mass near the bottom area(0~3 m)of the roof rapidly rises first and then gradually decreases,while the temperature of the rock mass at 3~10 m rises slowly,and the range of temperature conduction in overlying strata is about 10 m;the load and thermal stress of immediate roof of CSA rise rapidly after a period of stability,and the tensile strength decreases first and then rises,which leads to that the limit span of immediate roof decreases slightly first and then increase sharply;the reasonable length of shortwall face of UCG should be less than the minimum value of limit span of immediate roof,from which the reasonable length of shortwall face of Panjiang UCG project in Guizhou is identified as 12 m.This method could provide a theoretical guidance for the length design of UCG working face.

关 键 词：煤炭地下气化 短壁开采 工作面长度 热-力耦合 极限跨距 

分 类 号：TD844[矿业工程—煤矿开采]