基于应变软化模型的岩体单轴压缩裂隙扩展

李胡勇; 马铮铮; 张亚东; 刘红岩

基于应变软化模型的岩体单轴压缩裂隙扩展

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- 发布日期: 2018-04-19

Crack Propagation of Rock Mass Under Uniaxial Compression Based on Strain Softening Model

摘要

摘要: 分别采用FLAC^3D程序中的应变软化模型及空模型来描述岩石及裂隙的力学行为，同时采用超细单元划分法对计算模型进行剖分以模拟裂隙扩展。采用上述数值计算模型研究了单轴压缩荷载下裂隙长度、倾角和裂隙条数对裂隙扩展路径及岩体力学特性的影响。计算结果表明，试件单轴抗压峰值强度随裂隙长度增加而逐渐降低，当裂隙长度不同时，次生翼裂纹的出现位置及扩展路径也有较大差别。翼裂纹的萌生位置及扩展规律均随裂隙倾角而变化；试件峰值强度随裂隙倾角由0°增加到75°时，类抛物线规律变化，当裂隙倾角为30°时，试件峰值强度最低。裂隙条数对裂隙扩展路径及试件破坏模式有较大影响，且试件峰值强度随裂隙条数增加而逐渐减小。
- 裂隙岩体 /
- 应变软化模型 /
- 压缩应力应变曲线 /
- 裂隙扩展 /
- 数值模拟
Abstract: The strain softening model and the null model in FLAC^3D code are adopted respectively to describe the mechanical behavior of the rock and crack, and the superfine element division method is adopted to divide the calculation model to simulate the crack propagation. This numerical calculation model is adopted to study the effect of crack length, inclination, and number on the crack propagation path and rock mass mechanical behavior under uniaxial compression. The calculation results are as follows: the uniaxial compressive peak strength decreases with the increase of crack length, and the occurrence position and propagation path of the secondary wing crack vary greatly when the crack length is different. The occurrence position and propagation path of the wing crack vary with the crack inclination. The peak strength of the sample varies when the crack inclination changes from 0° to 75°, which changes according to the parabola, and it is the least when the crack inclination is 30°. The crack number has a large effect on the crack propagation path and the sample’s failure mode, and the peak strength of the samples gradually decreases with the increase of crack number.
- cracked rock mass /
- strain softening model /
- compressive stress-strain curve /
- crack propagation /
- numerical simulation

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参考文献(11)

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基于应变软化模型的岩体单轴压缩裂隙扩展

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出版历程

Crack Propagation of Rock Mass Under Uniaxial Compression Based on Strain Softening Model

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出版历程

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