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首页> 外文期刊>Computers and Geotechnics >Study on the deformation and strength characteristics of hard rock under true triaxial stress state using bonded-particle model
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Study on the deformation and strength characteristics of hard rock under true triaxial stress state using bonded-particle model

机译:结合颗粒模型研究真三轴应力状态下硬岩的变形和强度特性

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摘要

Deformation and strength characteristics of granite under true triaxial stress states (sigma(1) = sigma(2) = sigma(3)) are studied using 3D discrete element method (DEM). Lode angle theta(sigma) and the minimum principal stress sigma(3) are kept constant during each test by using distortional periodic boundary, eliminating the end effect and isolating the effect of intermediate principal stress sigma(2). Results reveal significant effect of sigma(2) on the common mechanical behavior and magnitude distribution of acoustic emission events. Based on a three-invariant strength criterion, variations of the instantaneous internal friction angle upon failure give an explanation for the sigma(2) effect on peak strength, which can be explained additionally by the energy release quantified as b-value.
机译:使用3D离散元方法(DEM)研究了真三轴应力状态(sigma(1)> = sigma(2)> = sigma(3))下花岗岩的变形和强度特性。在每次测试中,通过使用变形周期边界来消除角倾角theta(sigma)和最小主应力sigma(3),从而消除了端效应并隔离了中间主应力sigma(2)的影响。结果揭示了sigma(2)对常见的机械行为和声发射事件的大小分布的重大影响。基于三不变强度准则,失效时的瞬时内部摩擦角的变化说明了对峰强度的sigma(2)效应,这可以通过量化为b值的能量释放来解释。

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