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首页> 外文期刊>Tunnelling and underground space technology >Mechanism of zonal disintegration around deep underground excavations under triaxial stress - Insight from numerical test
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Mechanism of zonal disintegration around deep underground excavations under triaxial stress - Insight from numerical test

机译：三轴应力作用下深部基坑周围区域破裂的机理-数值试验的启示

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The failure pattern and failure mechanism around deep underground excavations under tri-axial stress, in particular the zonal disintegration at different scales, were studied through three-dimensional numerical tests. It is found that the failure patterns of deep underground openings are obviously influenced by the triaxial stress. Zonal disintegration is a general failure mode of deep surrounding rock mass under high triaxial stress, where the alternate fracture zones and intact zones are formed by the intersection of the fully developed shear dominated fractures. The circular failure pattern of zonal disintegration is only a very specific failure pattern of zonal disintegration that is more likely to be formed when the horizontal stress in the direction of tunnel axis being the maximum principal stress. Sometimes the circular failure pattern of zonal disintegration is only the miss-judgment based on the limited borehole observations. Numerical results also denote that the heterogeneities of rock masses play a very important role on the scale of zonal disintegration. (C) 2015 Elsevier Ltd. All rights reserved.
机译：通过三维数值试验研究了三轴应力作用下深地下基坑周围的破坏模式和破坏机理，特别是不同尺度下的纬向崩解。发现地下深孔的破坏模式明显受到三轴应力的影响。带状崩解是深部围岩在高三轴应力作用下的一般破坏模式，其中交替的破裂带和完整带是由充分发育的以剪切力为主的裂缝的交点形成的。带状崩解的圆形破坏模式只是带状崩解的一种非常特殊的破坏模式，当沿隧道轴线方向的水平应力为最大主应力时，更有可能形成这种破坏模式。有时，基于有限的井眼观测，地带崩塌的圆形破坏模式只是一种误判。数值结果还表明，岩体的非均质性在区域崩解的规模上起着非常重要的作用。 （C）2015 Elsevier Ltd.保留所有权利。

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