CAJ | 학술논문

开采华北型煤田受底板承压水威胁的煤炭资源,必须对底板围岩的破坏规律有所认识.为了弄清底板岩层的活动规律,利用实验室大型非线性三维计算机数值模拟,对煤层底板应力分布特征进行了研究.发现采场底板存在跨层拱结构,并指出跨层拱是承载地应力和水压的承载结构;通过理论计算,得出了跨层拱最大主应力的计算公式,据此可以得出底板岩层裂隙产生的位置,该成果可对华北型煤田受承压水威胁矿井的回采工作面宽度设计提供参考.
개채화북형매전수저판승압수위협적매탄자원,필수대저판위암적파배규률유소인식.위료롱청저판암층적활동규률,이용실험실대형비선성삼유계산궤수치모의,대매층저판응력분포특정진행료연구.발현채장저판존재과층공결구,병지출과층공시승재지응력화수압적승재결구;통과이론계산,득출료과층공최대주응력적계산공식,거차가이득출저판암층렬극산생적위치,해성과가대화북형매전수승압수위협광정적회채공작면관도설계제공삼고.
To mine coal resources threatened by confined groundwater in seam floor in North China coal fields, it is necessary to understand the destruction regularities in surrounding rocks of the floor. In this paper, by the nonlinear three-dimensional computer laboratory simulation we studied deeply the stress distribution in seam floor and found that there is the cross-layer arc in the mining floor, pointed out that the cross-layer arc is a bearing structure of groundwater and water pressure. Through the theoretical calculation, we have obtained the biggest principal stress formula of cross-layer arch, according to the formula we got the position where the fractures occur in seam floor, providing the reference for the design of the width of coal face in coal mines threatened by the confined ground-water in North China coal fields.