文献类型：期刊文献

英文题名：Mechanical Properties and Damage Evolution Characteristics of Thermal Damage Basalt Under Triaxial Loading

作者：Wang, Gang[1,2,4];Song, Leibo[1,2];Liu, Xiqi[3];Ma, Xiaoming[4];Qiao, Jiaxing[1,2];Chen, Hao[1,2];Wu, Longke[5]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Shaoxing Univ, Collaborat Innovat Ctr Prevent & Control Mt Geol H, Shaoxing 312000, Zhejiang, Peoples R China;[3]Pearl River Water Resources Res Inst, Hydraul Engn Res Calculat, Guangzhou 510611, Guangdong, Peoples R China;[4]Huahui Engn Design Grp Co Ltd, Shaoxing 312000, Zhejiang, Peoples R China;[5]Guangxi Commun Design Grp Co Ltd, Nanning 530029, Guangxi, Peoples R China

年份：2023

外文期刊名：ROCK MECHANICS AND ROCK ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001095207200001)、、EI(收录号：20234415004581)、Scopus(收录号：2-s2.0-85175372530)、WOS

基金：The project was supported by the National Natural Science Foundation of China (No. 42002275), Natural Science Foundation of Zhejiang province (No. LQ21D020001), China Postdoctoral Science Foundation (No. 2021M692319; 2023M732689), Shaoxing Science and Technology Plan Project(No.2022A13003).

语种：英文

外文关键词：Rock mechanics; High temperature effect; Basalt; Mechanical behavior; Damage characteristics

外文摘要：To explore the mechanical properties and damage characteristics of basalt under high temperature and high pressure, triaxial compression tests are conducted on thermal damage rock samples, and the evolution process from progressive damage to macroscopic failure of rock is tracked and quantified by CT image reconstruction and acoustic emission technology. The results show that: (1) the ability of basalt to resist load and deformation changes from slight enhancement to rapid deterioration with the increase of temperature, and 600 celcius is its threshold. The failure mode of rock gradually changes from brittleness to plasticity with the increase of temperature, and its post-peak stress gradually presents certain plastic flow characteristics. (2) With the increase of temperature, the initial damage variable D0 of basalt presents a stage feature of changing from low-speed development to rapid growth. When the temperature exceeds 400 celcius, the total damage variable D will have obvious precursor characteristic of small increase before the drastic change, and this characteristic will become more obvious with the increase of temperature. (3) The main mineral types of basalt hardly change with the increasing temperature, while the temperature has a certain influence on the proportion of some components. The proportion of anorthite and enstatite shows the changing trend of first decreasing and then increasing, while the evolution of andesine is opposite, and the proportion of other mineral components is basically unchanged. (4) The main reason for the improvement of mechanical properties of basalt within the temperature threshold is that the expansion of mineral particles and the constraint of confining pressure promote the closure of internal primary cracks and increase the compactness. However, when the heat treatment temperature of basalt exceeds the threshold value, the structural deterioration caused by heat treatment is gradually prominent, and the defects generated play a leading role in the mechanical properties of rock. The mechanical properties of thermal damage basalt under triaxial loading were clarified and its temperature threshold was obtainedThe evolution process from progressive damage to macroscopic failure of basalt was tracked and quantifiedThe microscopic failure mechanism of thermal damage basalt was revealedThe number of tensile cracks of saturated coal increased with the cyclic loading frequency due to the prominent lag effect of strain behind stress.