期刊论文

Hysteresis Characteristics and Damage Deformation Analysis of Fractured Rock Mass with Different Crack Opening Under Cyclic Loading and Unloading

中文

黄金科学技术

1005-2518

2021

29

03

392-400

10.11872/j.issn.1005-2518.2021.03.220

国家自然科学基金项目“水—力耦合作用下卸荷诱导的裂隙体破断实验与灾变机理研究”（编号：51704168）； 湖南省自然科学基金青年项目“渗流场长时稳定作用的裂隙体破断实验与机理研究”（编号：2019JJ50528）联合资助；

本校为第一机构

为探究张开度和不同应力等级循环加卸载复合影响下裂隙岩体的损伤特性和裂纹演化规律,利用水泥砂浆制备不同张开度单裂隙类岩石材料,基于RMT-150B岩石力学试验机对类岩石材料开展了3种等级的应力循环加载试验,分析了裂隙类岩石材料的应力—应变曲线特征、滞回环面积变化规律、动弹性模量变化规律及损伤特性。试验结果表明:类岩石材料的强度随应力循环等级的增大而出现弱化现象,同时循环过程中加卸载曲线形成的滞回环由刚开始的"密集型"转为"稀疏型";类岩石材料滞回环的面积随着循环次数的增大呈递减趋势,而滞回环面积随张开度的增大呈递增趋势;当循环应力和循环次数相同时,类岩石材料的动弹性模...

In order to explore the damage characteristics and crack evolution law of fractured rock mass under the combined influence of opening and cyclic loading and unloading of different stress levels, four kinds of single fractured rock materials with different opening(0.1,0.2,0.4,0.8 mm)were prepared by cement mortar, and three kinds of cyclic stress loading tests were carried out on rock-like materials based on RMT-150B rock mechanics testing machine. The characteristics of stress-strain curves, hysteretic loop area, dynamic elastic modulus and damage of fractured rock materials were analyzed. The...