矿井突水模型试验顶板离层破断数值模拟研究  

Study on the numerical method simulating roof separation in a coal mine water inrush model test

作　　者：冯现大[1] 李树忱[1] 李术才[1] 李利平[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《湖南科技大学学报（自然科学版）》2011年第2期47-53,共7页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：973计划项目(2007CB209407;2010CB732002);国家自然科学基金设备专项(50727904);交通部西部交通建设科技项目(2009318000008);山东省自然科学基金资助项目(2009ZRB02285);国家自然科学基金资助项目(51009085)

摘　　要：针对矿井突水模型试验中的顶板离层破坏,用有限差分程序(FLAC)中的interface单元模拟层理面,开展流-固耦合模拟研究.实现了对矿井突水模型试验中顶板离层破坏和突水全过程的模拟,模拟结果较好地刻画出煤层开采后顶板岩层从沉降、离层直至垮塌突水的整个过程,能有效反应出矿井突水前顶板围岩位移急剧增大,渗压先增大后迅速降低的过程.同时将计算结果与试验监测数据进行了对比,二者吻合较好,表明所用的方法能够正确模拟矿井突水和顶板破断过程,该方法可以为矿井顶板离层破断突水等问题提供数值基础和相关前兆参数.Aiming to model roof separation and collapse in a coal mine water inrush model test,interfaces in FLAC are used to simulate bedding planes and fluid-solid coupling calculation was carried out.The whole process after progressive mining,including roof subsidence,bed separation,the sudden collapse and water inrush,was captured,which indicates that there is a sharp increase of the vertical displacement and the seepage pressure increases first,and then rapidly vanishes before water inrush.The numerical modeling results are also compared with monitoring data of the model test.The good agreement between them shows that the method used is correct and suited for modeling water inrush and roof collapse in coal mines.It offers not only numerical foundation for solving problems,such as roof separation and collapse,but also precursory parameters of water inrush.

关 键 词：顶板离层 矿井突水 有限差分程序 

分 类 号：TU458[建筑科学—岩土工程]