摘要
为了研究深埋巷道顶板软弱夹层对巷道围岩稳定性的影响,采用理论分析和数值模拟的方法,对巷道顶板软弱夹层厚度、位置和数量进行系统性研究。研究结果表明:(1)将顶板简化为弹性体和西原模型构成的组合系统,可以较好地描述顶板软弱夹层变形,当软弱夹层受力大于其屈服应力时,顶板失稳;(2)顶板软弱夹层对顶板具有一定的应力弱化作用,且在软弱夹层位置存在明显的应力跳跃现象,随着夹层数量的增加,底板应力集中程度略微增加;(3)距离顶板较近的软弱夹层对巷道围岩变形量影响较大,且在软弱夹层位置存在变形突变,巷道顶板易发生离层。结合数值模拟结果,当巷道顶板存在软弱夹层时,应及时采取支护措施,防止软弱夹层超过屈服应力导致巷道失稳冒落。
In order to study the influence of weak interlayer on the stability of surrounding rock of deep roadway roof, the thickness, position and number of weak interlayer in roadway roof were systematically studied by theoretical analysis and numerical simulation. The results are concluded as follows. Firstly, the roof is simplified as a composite system composed of elastic body and Nishihara model, which can better describe the roof deformation. When the stress of weak interlayer is greater than its yield stress, the roof will lose stability. Secondly, the weak interlayer of roof has a certain stress weakening effect on the roof, and there is an obvious stress jump phenomenon at the position of the weak interlayer. With the increase of the number of interlayers, the stress concentration of the floor increases slightly. Thirdly, the weak interlayer close to the roof has a great influence on the deformation of the surrounding rock of the roadway, and there is a deformation mutation at the position of the weak interlayer, and the roof of the roadway is prone to separation. Combined with the numerical simulation results, when there is a weak interlayer in the roof of the roadway, support measures should be taken in time to prevent the instability and caving of the roadway caused by the weak interlayer exceeding the yield stress.
作者
申付新
宋彦琦
裴添翼
郑俊杰
马宏发
邵志鑫
SHEN Fuxin;SONG Yanqi;PEI Tianyi;ZHENG Junjie;MA Hongfa;SHAO Zhixin(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining&Technology(Beijing),Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第2期102-107,共6页
Mining Research and Development
基金
煤炭资源和安全开采国家重点实验室开放基金项目(SKLCRSM20KFA11)
中央高校基本科研业务费专项资金资助项目(2022YJSLJ09)
中国矿业大学(北京)大学生创新训练项目(202106068)。
关键词
软弱夹层
夹层位置
夹层数量
围岩稳定性
Weak interlayer
Interlayer position
Number of interlayers
Stability of surrounding rock
