基于修正莫尔-库仑准则的围岩瞬态卸荷塑性变形分析
发布时间：2018-11-01 17:44
【摘要】：将卸荷视为动态过程,采用包含拉伸截断和帽盖模型的修正莫尔-库仑准则,对不同开挖形状和应力状态条件下围岩瞬态卸荷塑性区进行了分析.研究结果表明:瞬态卸荷可导致自由面附近产生塑性变形,造成围岩损伤弱化甚至破坏;拉伸应力是造成围岩动态卸荷破坏的重要因素;塑性变形随着埋深的增加而增大;最大压应力方向易于产生塑性变形,以拉伸变形为主,当初始应力满足一定条件时,最小压应力方向将产生严重压剪塑性变形;从卸荷的角度考虑,巷道断面曲率较大为宜,尽量避免直线形边界.
[Abstract]:The unloading is regarded as a dynamic process, and the Mohr Coulomb criterion, which includes tensile truncation and cap model, is used to analyze the transient unloading plastic zone of surrounding rock under different excavation shapes and stress states. The results show that transient unloading can lead to plastic deformation near the free surface, weaken or even destroy the surrounding rock, tensile stress is an important factor of dynamic unloading failure of surrounding rock, plastic deformation increases with the increase of buried depth. The direction of the maximum compressive stress is easy to produce plastic deformation, and the tensile deformation is the main one. When the initial stress satisfies certain conditions, the direction of the minimum compressive stress will produce severe compressive and shear plastic deformation. Considering from the angle of unloading, the roadway section curvature is larger and the linear boundary is avoided as far as possible.
【作者单位】： 东北大学资源与土木工程学院;
【基金】：中央高校基本科研业务费专项资金资助项目(N140106002)
【分类号】：TU45
本文编号：2304637
[Abstract]:The unloading is regarded as a dynamic process, and the Mohr Coulomb criterion, which includes tensile truncation and cap model, is used to analyze the transient unloading plastic zone of surrounding rock under different excavation shapes and stress states. The results show that transient unloading can lead to plastic deformation near the free surface, weaken or even destroy the surrounding rock, tensile stress is an important factor of dynamic unloading failure of surrounding rock, plastic deformation increases with the increase of buried depth. The direction of the maximum compressive stress is easy to produce plastic deformation, and the tensile deformation is the main one. When the initial stress satisfies certain conditions, the direction of the minimum compressive stress will produce severe compressive and shear plastic deformation. Considering from the angle of unloading, the roadway section curvature is larger and the linear boundary is avoided as far as possible.
【作者单位】： 东北大学资源与土木工程学院;
【基金】：中央高校基本科研业务费专项资金资助项目(N140106002)
【分类号】：TU45
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