基于UDEC模拟的弱胶结软岩巷道变形失稳规律研究

Study on Law of Deformation and Instability of Weakly Cemented Soft Rock Roadway Based on UDEC Simulation

弱胶结软岩巷道变形量大,支护成本高。结合该类岩石的物理力学性能,分析了弱胶结软岩巷道的变形破坏特征及其影响因素。借助UDEC软件,研究了埋深和侧压系数对巷道围岩变形破坏特征、塑性区分布特征的影响,从而得到弱胶结软岩巷道变形失稳规律。即随着埋深的增加,巷道围岩的位移增加量不断变大,位移增加幅度逐渐变小;当λ<1.2时,随着侧压系数的增加,巷道顶底板位移增加幅度先增加后减小,之后,随着侧压系数的增大,位移增加幅度基本不变;对于巷道帮部,位移增加幅度随着侧压系数的增大逐渐减小。

The deformation of the weakly cemented soft rock roadway is large,the maintenance is difficult,and the support cost is high.Combined with the physical and mechanical properties of this type of rock,the deformation and failure characteristics of weakly cemented soft rock roadway and its influencing factors were analyzed.UDEC software was used to study the influence of buried depth and lateral pressure coefficient on the characteristics of deformation and failure,distribution characteristics of plastic zone,thus obtaining the law of deformation and instability of weakly cemented soft rock roadway.As the buried depth increases,the increased amount of the displacement of the roadway surrounding rock will increase,and the increased range of displacement will gradually decrease.Whenλ<1.2,with the increase of the lateral pressure coefficient,the increased range of displacement of the roadway roof and floor increases first and then decreases.After that,with the increase of the lateral pressure coefficient,the increase in displacement is basically unchanged.For the roadway sides,the increase in displacement gradually decreases with the increase of the lateral pressure coefficient.