巷道底板承压水突水评价方法研究

发布时间：2018-03-14 23:05

本文选题：承压水　切入点：底板突水　出处：《工程科学与技术》2017年03期 　论文类型：期刊论文

【摘要】：华北石炭二叠纪聚煤区是中国最重要的煤炭生产基地,区内众多煤矿皆受煤系底部奥陶系灰岩承压水威胁。针对当前煤矿巷道底板承压水突水评价方法存在的局限和不足,探索研究巷道底板承压水突水评价方法。现行评价方法岩梁法的理论计算前提主要包括:底板隔水层简化为两端固支梁;在岩梁弯矩最大处,底板隔水岩层承受的拉应力超过抗拉强度,岩层拉裂破坏;忽略孔隙水压力对岩石破坏的影响,计算隔水层厚度时抗拉强度取底板隔水层的平均值。事故数据及研究分析表明岩梁法计算假设存在不合理之处,与实际工况有较大偏差。基于对常见矩形巷道围岩应力分布特征的分析,结合巷道实际工况,摒弃底板隔水岩层弯拉破坏模式,提出隔水岩层剪切破坏模式,建立巷道底板承压水突水破坏岩柱模型;基于所建立的岩柱模型,利用极限平衡理论,综合考虑孔隙水压力对岩石破坏的影响,推导底板隔水层承受最大水压的计算评价方法。结果表明:最大水压与隔水层厚度、隔水层平均容重、抗剪强度参数、孔隙水压力系数和巷道宽度直接相关,最大水压与隔水层厚度呈指数函数关系。文中所提评价方法的计算结果与实测吻合,证明该方法合理有效。所提方法也能为地下工程其他专业领域类似的承压水突水问题研究提供借鉴。
[Abstract]:Carboniferous Permian coal accumulation area in North China is the most important coal production base in China. Many coal mines in the area are threatened by confined water of Ordovician limestone at the bottom of coal measures. This paper explores and studies the evaluation method of water inrush from roadway floor pressure. The theoretical calculation premise of the present evaluation method is mainly as follows: the bottom water isolation layer is simplified to two ends fixed beam, where the bending moment of rock beam is maximum, The tensile stress of the bottom water-insulating rock is higher than the tensile strength, and the rock layer is cracked and destroyed, and the influence of pore water pressure on the rock failure is ignored. When calculating the thickness of the water-proof layer, the tensile strength is taken as the average value of the water-proof layer of the bottom plate. The accident data and the research and analysis show that the calculation hypothesis of the rock-beam method is unreasonable. Based on the analysis of the stress distribution characteristics of surrounding rock in common rectangular roadways, combined with the actual working conditions of roadway, the bending and tensile failure mode of floor water-isolating rock layer is abandoned, and the shear failure mode of water-proof rock stratum is put forward. Based on the rock column model and limit equilibrium theory, the influence of pore water pressure on rock failure is considered. The results show that the maximum water pressure is directly related to the thickness, the average bulk density, the shear strength parameter, the pore water pressure coefficient and the roadway width of the water barrier layer, and the maximum water pressure is directly related to the thickness of the water barrier layer, the average bulk density of the water barrier layer, the shear strength parameter, the pore water pressure coefficient and the tunnel width. The relationship between the maximum water pressure and the thickness of the water barrier is exponential. The calculated results of the evaluation method proposed in this paper are in good agreement with the measured results. It is proved that this method is reasonable and effective. The proposed method can also be used for reference in the study of water inrush under pressure in other fields of underground engineering.
【作者单位】：四川大学水利水电学院;河南工程学院安全工程学院;宁夏水利水电勘测设计研究院有限公司;
【基金】：国家自然科学基金资助项目(51369001) 河南省科技攻关计划项目资助(172102310706) 河南省高等学校重点科研项目资助(16A44001)
【分类号】：TD745.2

【相似文献】