Investigation of Reasonable Reserved Deformation of Deep-Buried Tunnel Excavation Based on Large Deformation Characteristics in Soft Rock

被引：0
|
作者：
Yang, Zhen [1 ]
Liu, Peisi [2 ]
Wang, Bo [3 ]
Zhao, Yiqi [3 ]
Zhang, Heng [3 ]
机构：
[1] Gansu Tianlong Railway Co Ltd, Lanzhou 730020, Peoples R China
[2] China Railway Eryuan Engn Grp Co Ltd, Chengdu 610031, Peoples R China
[3] Southwest Jiaotong Univ, Key Lab Transportat Tunnel Engn, Minist Educ, Chengdu 610031, Peoples R China
来源：
BUILDINGS | 2024年 / 14卷 / 10期
基金：
中国国家自然科学基金;
关键词：
tunnel; reserved deformation; high in situ stress; large deformation; influencing factors; MECHANICAL-BEHAVIOR; SURROUNDING ROCK; STRESS; FAILURE;
D O I：
10.3390/buildings14103159
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study studies the deformation characteristics of the diversion tunnel of Jinping II Hydropower Station in order to guarantee the safety of the excavation of a large-section soft rock tunnel with a depth of 1000 m and increased ground stress. Using field data, theoretical computations, and numerical modeling, the proper reserved deformation of a deep soft rock tunnel is investigated, taking into consideration the size, in situ stress, and grade of the surrounding rock. The study reveals that (1) The diversion tunnel's incursion limit, which is typically between 20 and 60 cm, is serious; (2) The surrounding rock level > geostress > tunnel size are the influencing parameters of reserved deformation that remain unchanged while using the numerical simulation method, which is more accurate in simulating field conditions; (3) The west end of the Jinping diversion tunnel has a 30-60 cm reserved deformation range for the chlorite schist tunnel. The deformation law of a large-section, 1000 m-deep soft rock tunnel is better understood, and it also offers important references for high-stress soft rock tunnel engineering design, construction, and safety management.
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页数：20
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