软弱顶板煤巷围岩变形破坏特征数值分析

Numerical Analysis of Soft Surrounding Rock Deformation and Failure of Coal Entry

为了研究软弱围岩巷道变形破坏特征及其变化规律,借助FLAC2D软件建立数值分析模型,模拟软弱顶板巷道围岩变形破坏全过程,分析得到在巷道从开挖初期到围岩失稳及后期达到新稳定过程中围岩应力场、塑性区分布情况及破坏特征的变化规律.结果表明,解决顶板问题是维护软弱顶板巷道整体稳定性的关键,巷道底鼓与两帮收敛两者是相互关联,并同时受到顶板下沉的影响.

In order to further understand the mechanism of surrounding rock deformation and failure, the numerical analysis model was described with FLAC^2D software based on the deformation and failure rule of the soft surrounding rock. The whole procedure of surrounding rock deformation and failure was presented. And the stress field and plasticity zone distribution as well as the characteristics of failure were investigated. The variation rule of stress field of surrounding rock, the distribution of plastic zone, and the failure characteristic in the process from initial digging to the unstable period of surrounding rock till the new stable state are discussed. The results show that the stability of floor is the key factor to the whole stability of soft surrounding rock and the floor heave of the tunnel are associated with the convergence of the two sides and is influenced by the roof sinking.