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首页> 外文期刊>Arabian journal of geosciences >Study on the deformation and failure modes of rock mass containing concentrated parallel joints with different spacing and number based on smooth joint model in PFC
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Study on the deformation and failure modes of rock mass containing concentrated parallel joints with different spacing and number based on smooth joint model in PFC

机译：基于PFC的光滑节理模型研究不同间距和数目的集中平行节理岩体的变形破坏模式

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Engineering mechanical properties of rock mass are largely influenced by the characteristics of weak joints. Concentrated parallel joints are well developed in a large hydropower station in southwest China, and the deformation behavior of these joint belts is a key factor affecting slope stability. Therefore, this paper performed a simulation by particle flow code (PFC) and smooth joint model (SJM) to study the deformation and failure modes of rock mass containing concentrated parallel joints with different spacing and number. The following findings were obtained. (1) Four deformation phenomena of rock mass with concentrated joints were identified by field investigation: shearing along a single joint, shearing along multiple parallel joints, shearing across joints, and shearing through multiple joints and shaping as step-path deformation. (2) With the increase of joint number, peak strength and elastic modulus of rock mass decreased and the stair-shaped phenomenon of fracture became obvious. (3) The distance between tensile cracks, which are developed between joints during deformation process, has something to do with the joint spacing. Large spacing formed large distance, and small spacing formed small distance. (4) Although the elastic modulus decreased with the increase of smooth joint (SJ) number, no matter how big or small spacing is, for the rock mass with the same number of smooth joint, the elastic moduli are very close to each other. This may be the result of behavior of hard rock material and SJM assumption. The results of this paper illustrated that fracture developed along concentrated parallel joints should consider the interaction between joints. But how to consider and deal with the concentrated parallel joints for the slope stability calculation still needs more discussion.
机译：岩体的工程力学特性在很大程度上受弱节理特征的影响。西南某大型水电站集中平行节理发育良好，这些节理带的变形行为是影响边坡稳定性的关键因素。因此，本文通过粒子流代码（PFC）和光滑节理模型（SJM）进行了模拟，以研究包含间距和数量不同的集中平行节理的岩体的变形和破坏模式。获得以下发现。 （1）通过现场调查确定了节理集中的岩体的四种变形现象：单节剪，多节平行剪，节间剪，多节剪，阶梯状变形。 （2）随着节理数的增加，岩体的峰值强度和弹性模量下降，台阶状断裂现象明显。 （3）拉伸裂纹之间的距离是在变形过程中在节点之间发展的，它与节点间距有关。大间距形成大距离，小间距形成小距离。 （4）尽管弹性模量随光滑节理数（SJ）的增加而减小，但无论间距大小，对于相同数目的光滑节理岩体，其弹性模量都非常接近。这可能是硬岩材料的行为和SJM假设的结果。本文的结果表明，沿集中的平行节理发展的裂缝应考虑节理之间的相互作用。但是如何考虑和处理集中平行节理进行边坡稳定计算还需要更多的讨论。

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