中低应变加载速率下单节理裂隙岩体的单轴动态压缩力学性能试验  

Experimental Study on Uniaxial Dynamical Compressive Mechanical Properties of Single-joint Plane Rock Mass Under Low and Moderate Strain Rates

作　　者：熊良宵 汪子华 Xiong Liangxiao;Wang Zihua(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Zhejiang Engineering Investigation Institute,Ningbo 315000,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]浙江省工程勘察院,浙江宁波315000

出　　处：《石家庄铁道大学学报（自然科学版）》2020年第2期24-32,共9页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(41541021)。

摘　　要：对人工制作的节理岩体试件进行了中低应变加载速率下的单轴压缩试验,研究了应变速率和节理面的倾角β对节理岩体的极限抗压强度、峰值应变、弹性模量和损伤变量的影响。研究结果表明:(1)当加载的应变速率相同时,当节理面的倾角β由0°增加到90°,试件的抗压强度呈逐渐减小后又逐渐增加的趋势,试件的峰值应变均呈先减小后略有增加的变化规律,试件的弹性模量整体出现逐渐增加的变化规律。(2)当试件的节理面倾角相同时,随着应变加载速率逐渐增加,试件的抗压强度呈逐渐增加的趋势,当β为60°时,试件的抗压强度对应变率敏感性最强,试件的峰值应变和弹性模量随应变加载速率的变化并没有固定明显的变化规律。(3)当应变加载速率相同且应变相同时,随着节理面的倾角由0°增加到90°,损伤变量基本都呈先逐渐增加后减小的趋势,当节理面的倾角为60°时的损伤变量最高,当节理面倾角为90°时的损伤变量最小;当试件的节理面倾角相同,应变加载速率逐渐增加时,损伤变量基本呈逐渐增加的趋势。The effects of strain rate and the inclined angle(β)of joint plane on compressive strength,peak strain,elastic modulus and damage variable of jointed rock mass specimen was studied by conducting uniaxial compression test on the artificial jointed rock mass specimen under moderate strain rates.Test results show that:(1)When the strain rate is the same and with angleβincreasing from 0°to 90°,the compressive strength of jointed rock mass specimen will decrease firstly and then increase gradually,the peak strain of jointed rock mass specimen will decrease firstly and then increase gradually,and the elastic modulus of jointed rock mass specimen will increase wholly.(2)When the angleβis the same and with strain rate increase,the compressive strength of jointed rock mass specimen will increase gradually,the compressive strength of jointed rock mass specimen when angleβis 600 is most sensitive to strain rate,and there is no obvious change law of peak strain and elastic modulus of jointed rock mass specimen.(3)When the strain rate is the same,the strain is the same and with angleβincreasing from 0°to90°,the damage variable of jointed rock mass specimen will increase firstly and then decrease gradually,the damage variable of jointed rock mass specimen when angleβis 600 is highest,and the damage variable of jointed rock mass specimen when angleβis 900 is lowest.When the angleβis the same,the damage variable of jointed rock mass specimen will increase with increase strain rate.

关 键 词：节理岩体 应变率 抗压强度 峰值应变 损伤变量 

分 类 号：TU45[建筑科学—岩土工程]