采动影响下断层稳定性的力学机理及其控制研究

Title

Study on mechanics mechanism and control of fault stabilityunder mining-induced influence
作者

林远东涂敏付宝杰李传明
Author

LIN Yuandong，TU Min，FU Baojie，LI Chuanming
单位

安徽理工大学力学与光电物理学院煤矿安全高效开采省部共建教育部重点实验室
Organization

1.School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan , China; 2.Key Laboratory of Safety and High-efficiency Coal Mining of Ministry of Education, Huainan ,China
摘要

断层受采动影响易发生活化，常引发塌方、冒顶、突水、矿震、冲击地压等事故。为了探明断层发生活化的条件，将断层带、上盘和下盘视为一个系统，采用Anderson断层模型和Mohr-Coulomb强度准则，经数理分析，研究了采动影响下断层的稳定性问题及系统参量对断层稳定性的影响。结果表明：断层处于自锁还是活化状态，取决于断层视摩擦因数k1与断层摩擦因数k之间的量值关系；当k1<k时断层处于自锁状态，当k1≥k时断层处于活化状态；视摩擦因数k1反映了断层在采动影响下地应力(包括σ1和σ3)、断层面黏聚力c及断层裂隙流体压力pi等因素共同作用的应力积累水平，其值越大断层活化的倾向性越高；摩擦因数k是由断层内摩擦角φ确定的量，反映了断层带与断层上盘和下盘在结构面处的粗糙度，结构面越粗糙断层内摩擦角φ越大，使得摩擦因数k越大；摩擦因数k越大断层的稳定性越好；系统参量(包括α、φ、c、pi、σ1和σ3等)在采动作用下发生变化后将对断层的稳定性产生影响：断层倾角α越接近于断层特征角α1，断层发生活化的倾向性越大；断层内摩擦角φ越小断层越易活化；断层面黏聚力c越小断层越易活化；断层裂隙流体压力pi越大断层越易活化；垂直应力σ1越大断层越易活化；水平应力σ3越小断层越易活化。基于系统参量对断层稳定性的影响规律，提出了控制系统稳定性的方法。研究结果对发育有断层的地下资源开采及防震减灾、隧道、地下结构等工程具有参考价值。
Abstract

Faults are prone to be activated under the influence of mining, often causing accidents such as landslides, roof collapse, water inrush, mine earthquake, rock burst and others. In order to find out the conditions for the activation of the fault, the fault zone, the upper plate and the lower plate were regarded as a system. The stability of fault under the influence of mining and the influence of system parameters on the stability of fault were studied through theoretical analysis, and Anderson fault model and Mohr-Coulomb strength criterion were used. The results show that the fault is in self-locking or activation state, depending on the relationship between the apparent friction coefficient k1 and the fault friction factor k; the fault is in self-locking state when k1
关键词

断层自锁断层活化采动摩擦因数稳定性控制
KeyWords

fault self-locking; fault activation; mining disturbance; friction factor; stability control
基金项目(Foundation)

国家自然科学基金资助项目(51574007，51504005，51674004)
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