横观各向同性板岩的三轴压缩损伤本构模型  

Triaxial Compression Damage Constitutive Model of Transversely Isotropic Slate

作　　者：贾健 陶铁军 田兴朝 谢财进 李国庆 Jia Jian;Tao Tiejun;Tian Xingchao;Xie Caijin;Li Guoqing(School of Civil Engineering,Guizhou University,Guiyang 550025,China;College of Mining,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学土木工程学院,贵阳550025 [2]贵州大学矿业学院,贵阳550025

出　　处：《地下空间与工程学报》2025年第2期393-402,共10页Chinese Journal of Underground Space and Engineering

基　　金：贵州省高层次创新型人才(百层次)(黔科合平台人才-GCC[2022]004-1);贵州省创新人才团队(黔科合平台人才-CXTD[2022]010);贵州省科技厅科技支撑计划项目(黔科合支撑[2023]一般120)。

摘　　要：为探究层理板岩在三轴压缩荷载作用下的力学性能和损伤演化规律,将层理结构面显著的板岩看作由包含微观缺陷的岩块、节理面闭合元件和剪切变形元件串联而成的复合岩体。考虑层理结构面的闭合和剪切滑移变形对层理岩石试样轴向变形的影响,结合统计损伤力学理论建立三轴压缩荷载下层理板岩的损伤本构模型,并开展三轴压缩试验验证模型的准确性。结果表明:建立的损伤本构模型可以准确地描述层理板岩应力-应变曲线的压密段和弹性段;层理倾角在0°到90°变化时层理板岩的强度和变形能力整体呈现U形分布,60°时呈现最小值;随着倾角的增加其破坏类型由张剪复合破坏向剪切滑移破坏发展,90°时为劈裂张拉破坏;损伤演化曲线整体呈现S形分布规律。To explore the mechanical properties and damage evolution law of bedded slate under a triaxial compression load.The slate with apparent bedding structural plane is a composite rock mass formed by a series of connections of common plane closing element and shear deformation element of rock block containing microscopic defects.Considering the influence of closure of bedding structural plane and shear slip deformation on axial deformation of bedding rock specimen,the damage constitutive model of bedding slate under triaxial compression load is given,and the accuracy of the damage constitutive model is verified by triaxial compression test.The results show that the establishment of the damage constitutive model can accurately describe the compaction section and elastic section of the stress-strain curve of bedding slate;When the bedding dip angle changes from 0°to 90°,the strength and deformation capacity of the bedding slate show a U-shaped distribution as a whole,and the minimum value appears at 60°;With the increase of dip angle,the failure type develops from tensile-shear composite failure to shear-slip failure,and it is splitting tensile failure at 90°;The damage evolution curve shows an overall Sshaped distribution law.

关 键 词：板岩 横观各向同性 损伤本构 三轴压缩 力学性能 

分 类 号：TU458[建筑科学—岩土工程]