节理倾角对单节理岩样变形破坏影响的数值模拟

被引：11

作者：

王学滨

机构：

[1] 辽宁工程技术大学力学与工程科学系

来源：

四川大学学报(工程科学版) | 2006年 / 02期

关键词：

单节理岩样; 节理倾角; 应力-应变曲线; 峰值强度; 剪切带; 应变软化;

D O I：

10.15961/j.jsuese.2006.02.006

中图分类号：

TU452 [岩体力学性质及应力理论分析];

学科分类号：

0801 ; 080104 ; 0815 ;

摘要：

采用FLAC模拟了节理倾角对各向异性岩样峰值强度、力学行为及剪切带图案的影响。节理由实体单元模拟。对于节理之外的岩石,采用莫尔库仑与拉破坏复合的破坏准则,峰后本构关系选择线性应变软化模型;对于节理,采用理想弹塑性的莫尔库仑准则。结果表明,无节理密实岩石的峰值强度最高。节理岩样的剪切应变或集中在节理上,或集中在新剪切带上,峰值强度随节理倾角而改变。新剪切带启动于节理的端部,然后沿其固有方向传播。当节理倾角适中时,节理岩样的峰值强度较低,岩样的行为受控于节理。当节理倾角较高或较低时,可观测到应变软化行为。若节理倾角较低,新剪切带的长度随节理倾角的降低而增加,这导致了陡峭的峰后应力-应变曲线。若节理倾角较高,由于节理倾角对新剪切带的厚度和倾角几乎没有影响,因此,峰后斜率不依赖于节理倾角。

引用

页码：24 / 29

页数：6

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