摘要
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。
In order to study the mechanical characteristics of the anchored layered limestone under different anchored angles,WAW-3000 kN 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 parameters 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 skeleton 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 established based on the variation laws of acoustic emission characteristics.Comparing with the results of the mechanical 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.
作者
李豪逸
左双英
陈世万
杨冲
田娇
LI Haoyi;ZUO Shuangying;CHEN Shiwan;YANG Chong;TIAN Jiao(Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;College of Resources and Environment Engineering,Guizhou University,Guiyang 550025,China;Guizhou Provincial Transportation Planning Survey and Design Research Institute Co.,Ltd.,Guiyang 550081,China)
出处
《工程地质学报》
CSCD
北大核心
2024年第2期481-491,共11页
Journal of Engineering Geology
基金
国家自然科学基金项目(资助号:42167025)
贵州省科学技术基金重点项目(资助号:黔科合基础[2020]1Z052)
贵州省科学技术基金项目(资助号:[2020]1Y185)
贵州省科技重大专项计划(黔科合重大专项字资助号:[2018]3011)。
关键词
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
Anchored limestone
Anisotropic
Nonlinear deformation in void compacting stage
Acoustic emission(AE)
Statistical damage theory
