三维岩样单轴压缩端面效应及破坏数值模拟

被引：8

作者：

王学滨

机构：

[1] 辽宁工程技术大学力学与工程科学系辽宁阜新

来源：

四川大学学报(工程科学版) | 2005年 / 02期

关键词：

三维岩样; 剪切破坏; 端面效应; 应变局部化; 空间剪切带; 应力分布;

D O I：

10.15961/j.jsuese.2005.02.006

中图分类号：

TU451 [];

学科分类号：

0801 ; 080104 ; 0815 ;

摘要：

采用三维拉格朗日元法,对三维岩样在单轴压缩及不同端面约束条件下,试样端面上压应力的分布及演化规律、试样的破坏过程及空间局部化区域的形态进行数值模拟研究。在峰值强度之前及之后,岩石的本构模型分别取为线弹性及莫尔库仑剪破坏与拉破坏复合的应变软化模型。数值结果表明,对于粗糙端面,由于强烈的端面约束,试样的弹性区是以两端面为底面的锥体;锥体一旦形成,随着时间步的增加,其体积基本保持不变;压应力集中于端面的四个边上。对于光滑端面,弹性区被塑性区所包围,随着时间步的增加,弹性区逐渐缩小,直到消失;压应力集中于端面的中心。在平面应力状态下,未观测到明显的局部化剪切带图案。无论粗糙还是光滑端面,三维岩样都发生了明显的剪切破坏。三维岩样内部的剪切应变局部化带有主有次,占主导地位的剪切带尺寸较大,应变率集中程度较大。

引用

页码：28 / 33

页数：6

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