首页|含层理加锚灰岩单轴压缩力学特性及变形全过程统计损伤模型

含层理加锚灰岩单轴压缩力学特性及变形全过程统计损伤模型

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为了探究锚固角度对含水平层理加锚灰岩单轴压缩力学特性的影响,利用WAW-3000 kN伺服万能液压试验机和PCI-2声发射采集系统,对不同锚固角度的加锚灰岩进行单轴压缩及声发射特性试验,得到了弹性模量、泊松比、抗压强度等力学指标随锚杆倾角的变化规律,并对声发射变化规律进行了分析.结果表明,加锚灰岩力学参数表现出明显的各向异性特征,且在不同的变形阶段声发射能量的变化规律也不相同.同时,综合分析了加锚灰岩空隙与骨架两部分变形之间的关系,基于声发射规律建立了考虑压密效应和弹塑性损伤演化的加锚灰岩全过程变形破坏分析方法和解析模型,其计算结果与试验曲线吻合度较高,表明所建立的模型能够很好地反映荷载作用下加锚灰岩加载初期空隙压密非线性变形和中后期累计损伤破坏的全过程.
MECHANICAL PROPERTIES AND STATISTICAL DAMAGE MODEL FOR WHOLE DEFORMATION PROCESS OF ANCHORED LAYERED LIME-STONE UNDER UNIAXIAL COMPRESSION TEST
In order to study the mechanical characteristics of the anchored layered limestone under different an-chored angles,WAW-3000kN servo universal hydraulic testing machine and the PCI-2 AE system were used to study uniaxial compression and the AE characteristics of the anchored layered limestone specimens with different anchored angles.Based on the experiments,the mechanical parameters of anchored layered limestone specimens such as elastic modulus,Poisson's ratio,peak strength,and their variation with rock bolt angle were obtained,and the variation laws of acoustic emission characteristics were also analyzed.The results show that the mechanical pa-rameters of anchored layered limestone exhibit obvious anisotropic characteristics and their variation laws of acoustic emission energy are related to different deformation stages.Furthermore,the relationship between the void and skel-eton deformation of anchored limestone is comprehensively analyzed,and the deformation analysis method for the whole process and elastic damage evolution model of anchored limestone considering the compaction effect are es-tablished based on the variation laws of acoustic emission characteristics.Comparing with the results of the mechani-cal model and the test curves,they fit well,which reveal the nonlinear deformation in the void compacting stage at the beginning of loading and the cumulative damage failure in the middle and later stages of the anchored limestone can be well reflected by this model.

Anchored limestoneAnisotropicNonlinear deformation in void compacting stageAcoustic emission(AE)Statistical damage theory

李豪逸、左双英、陈世万、杨冲、田娇

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贵州大学,喀斯特地质资源与环境教育部重点实验室,贵阳 550025,中国

贵州大学,资源与环境工程学院,贵阳 550025,中国

贵州省交通规划勘察设计研究院股份有限公司,贵阳 550081,中国

加锚灰岩 各向异性 空隙压密非线性变形 声发射 统计损伤理论

国家自然科学基金项目贵州省科学技术基金重点项目贵州省科学技术基金项目贵州省科技重大专项计划

42167025黔科合基础[2020]1Z052[2020]1Y18542167025

2024

10.13544/j.cnki.jeg.2022-0058

工程地质学报
中国科学院地质与地球物理研究所

工程地质学报

CSTPCD北大核心
影响因子：1.215
ISSN：1004-9665
年,卷(期)：2024.32(2)
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