文献类型：期刊文献

英文题名：Study on energy damage evolution of multi-flaw sandstone with different flaw lengths

作者：Peng, Yanyan[1,2,3];Zhou, Chong[1,2];Fu, Caifeng[4];Zhong, Zhen[1,2];Wang, Junjie[1,2]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[3]Huahui Engn Design Grp Corp Ltd, Shaoxing 312000, Peoples R China;[4]4th Engn Co LTD, Chnarailway Grp 22Bureau, Shanghai 100043, Peoples R China

年份：2024

卷号：132

外文期刊名：THEORETICAL AND APPLIED FRACTURE MECHANICS

收录：SCI-EXPANDED(收录号：WOS:001247052200001)、、EI(收录号：20242116150794)、Scopus(收录号：2-s2.0-85193905710)、WOS

基金：The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (Nos. 42277154)

语种：英文

外文关键词：Different flaw lengths; Mechanical variation characteristics; Energy dissipation; Damage constitutive model

外文摘要：Flaws are common in rock mass engineering. The length and number of flaws have a great influence on the stability of rock mass. In this paper, uniaxial compression tests were carried out on six kinds of multi-flawed sandstone with different flaw lengths. Based on damage mechanics and energy theory, the mechanical variation characteristics, total strain energy, elastic strain energy and dissipation energy evolution law of multi-flawed sandstone with different flaw lengths under uniaxial action were analyzed. Based on the energy dissipation, the damage variable is redefined, and the sandstone damage process is divided into three stages: the initial damage weakening stage I, the damage stability stage II, and the damage accelerated development stage III. Using this conclusion, considering the initial compaction weakening stage of rock samples, Duncan model is introduced to modify the constitutive model of equivalent strain hypothesis. The results show that the theoretical curve is in good agreement with the experimental curve, indicating that the damage constitutive model can accurately reflect the damage and failure process of multi-flaw rock samples with different flaw lengths.