文献类型：期刊文献

英文题名：The Transient Unloading Response of a Deep-Buried Single Fracture Tunnel Based on the Particle Flow Method

作者：Liu, Xiqi[1];Wang, Gang[1,2];Wen, Zhijie[3];Wang, Dongxing[1];Song, Leibo[2];Lin, Manqing[4];Chen, Hao[2]

机构：[1]Wuhan Univ, Sch Civil Engn, Key Lab Geotech & Struct Engn Safety Hubei Prov, Wuhan 430070, Peoples R China;[2]Shaoxing Univ, Collaborat Innovat Ctr Prevent & Control Mt Geol H, Shaoxing 312000, Peoples R China;[3]Shandong Univ Sci & Technol, Minist Educ, State Key Lab Min Disaster Prevent & Control, Qingdao 266590, Peoples R China;[4]Wuhan Inst Technol, Sch Resources & Safety Engn, Wuhan 430070, Peoples R China

年份：2023

卷号：15

期号：8

外文期刊名：SUSTAINABILITY

收录：SSCI(收录号：WOS:000979425400001)、SCI-EXPANDED(收录号：WOS:000979425400001)、、Scopus(收录号：2-s2.0-85156106914)、WOS

基金：The authors acknowledge the financial support provided by the National Natural Science Foundation of China (No. 52079098), the Fundamental Research Funds for the Central Universities (No. 2042022kf1219), the Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards of Zhejiang Province (No. PCMGH-2021-03), the State Key Laboratory of Mining Disaster Prevention and Control (Shandong University of Science and Technology), Ministry of Education (No. MDPC202023), and Shaoxing Science and Technology Plan Project (No. 2022A13003).

语种：英文

外文关键词：deep-buried tunnel; fractured rock mass; transient unloading; crack propagation; energy conversion

外文摘要：Particle flow numerical simulation was used to reproduce the transient unloading process of a deep-buried single fracture tunnel. The influence of fracture characteristics on the transient unloading effect was analyzed from the aspects of stress state, deformation characteristics, fracture propagation, and energy conversion. The results shows that the surrounding rock stress field of the deep-buried tunnel is divided into four areas: weak stress area I, strong stress area II, stress adjustment area III, and initial stress area IV. The fracture has an important impact on the stress adjustment process of transient unloading of the deep-buried tunnel, and the stress concentration area will be transferred from the bottom corner of the chamber and the vault to the fracture tip. With the increase in the fracture length, the distance from the stress concentration area at the fracture tip to the free surface gradually increases, and the damage area of the surrounding rock gradually migrates to the deep area of the rock mass. At this time, the release amount of strain energy gradually decreases and tends to be stable, while the dissipation energy shows a near 'U' shape change trend of decreasing first and then increasing. Under different fracture angles, the number of mesocracks is significantly different. Among them, the number of mesocracks in the 60 degrees and 30 degrees fractured surrounding rocks is greater followed by the 0 degrees fractured surrounding rock, and the number of mesocracks in the 45 degrees and 90 degrees fractured surrounding rocks is relatively less. In addition, the proportion of compression-shear cracks shows a change trend of increasing first and then decreasing with the increase in the fracture angle, and it reaches the maximum value in the 45 degrees fractured surrounding rock.