工程高温和加载速率下花岗岩力学损伤演化研究  

Research on mechanical damage evolution of granite under engineering high temperature and loading rate

作　　者：鲍先凯 张晓凡[1] 时睦涵 于超云 王舒锐 郑文翔 BAO Xiankai;ZHANG Xiaofan;SHI Muhan;YU Chaoyun;WANG Shurui;ZHENG Wenxiang(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Autonomous Region Building Structure Disaster Prevention and Mitigation Engineering Technology Research Center,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Autonomous Region Key Laboratory of Civil Engineering Safety and Durability,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010 [2]内蒙古科技大学内蒙古自治区建筑结构防灾减灾工程技术研究中心,内蒙古包头014010 [3]内蒙古科技大学内蒙古自治区土木工程安全与耐久重点实验室,内蒙古包头014010 [4]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010

出　　处：《武汉大学学报(工学版)》2025年第4期562-573,共12页Engineering Journal of Wuhan University

基　　金：内蒙古自然科学基金项目(2020LH05018,2020BS05017);内蒙古科技大学建研所开放基金(JYSJJ-2021M1,JYSJJ-2021Q06)。

摘　　要：为探究温度与加载速率下花岗岩力学损伤演化特性,对取自西藏山南地区某隧道花岗岩进行单轴压缩试验,采用声发射设备监测岩样加载损伤破坏过程,结合声发射振铃计数、振铃能量、损伤变量和关联维数对花岗岩损伤演化特性进行研究,结果表明:1)相同加载速率、不同工程高温条件下,花岗岩峰值强度和弹性模量变化规律性不强,相同温度、不同加载速率条件下,峰值强度和弹性模量在0.010 mm/s的加载速率下变化最为显著;2)在0.010 mm/s加载速率下,不同温度的花岗岩破坏以张拉破坏为主,其振铃计数和振铃能量演化曲线均经历了平静期、增长期、快速增长期和快速衰落期,各阶段振铃计数(或能量)及累计振铃数(或累计能量)演化特征存在较大差别;3)不同阶段的损伤量占比可以定量反映出花岗岩各时期的损伤破坏情况,平静期的损伤占比基本为0,随温度的升高,增长期的损伤占比由0.78降低到0.03,快速增长期的损伤占比由0.21增长到0.86;4)不同温度下花岗岩声发射参数关联维数曲线总体经历了“上升-突降-持续下降”或者“突降-持续下降”的变化趋势,在破坏失稳前,关联维数值降到最低,关联维数持续下降是花岗岩失稳破坏的前兆,可为岩体失稳破坏的研究提供参考。To explore the mechanical damage evolution characteristics of granite under temperature and loading rate,uni-axial compression tests are carried out on granite taken from a tunnel in Shannan Prefecture,Tibet Autonomous Region.Acoustic emission equipment is used to monitor the damage and failure processes of rock samples under loading,and the damage evolution characteristics of granite are studied by combining acoustic emission ringing count,ringing energy,damage variable and correlation dimension.The results show that:1)Under the same loading rate and different engineering high temperature conditions,the regularity of granite peak strength and elastic modulus change is not obvious;under the same temperature and different loading rate conditions,the peak strength and elastic modulus change most significantly under the loading rate of 0.010 mm/s.2)Under the loading rate of 0.010 mm/s,the failure of granite samples at different temperatures is mainly tensile failure;the ringing count and ringing energy evolution curves of granite samples at different temperatures have experienced quiet period,growth period,rapid growth period and rapid declining period,and there are great differences in the evolution characteristics of ringing count(or energy)and ringing cumulative count(or cumulative energy)at each stage.3)The proportion of damage in different stages can quantitatively reflect the damage and failure conditions of granite in different periods.The proportion of damage in the quiet period is basically 0.With the increase of temperature,the proportion of damage in the growth period decreases from 0.78 to 0.03,while the proportion of damage in the rapid growth period increases from 0.21 to 0.86.4)The correlation dimension curve of AE(acoustic emission)parameters of granite under different temperatures generally experiences a trend of rising-sudden drop-continuous descending or sudden drop-continuous descending.Before the failure and instability,the correlation dimension value drops to the lowest,and the continuous decli

关 键 词：温度 加载速率 声发射 损伤变量 关联维数 

分 类 号：TD315[矿业工程—矿井建设]