Design of the yielding support used highly deformable elements for a tunnel excavated in squeezing rock  

作　　者：TIAN Hong-ming TIAN Yun CHEN Wei-zhong TAN Xian-jun SHU Xiao-yun LIU Xia-lin 

机构地区：[1]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China [2]Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,School of Civil Engineering,Shaoxing University,Shaoxing 312000,China [3]College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China [4]China communications second highway survey and design institute Co.,Ltd.,Wuhan 430058,China

出　　处：《Journal of Mountain Science》2023年第5期1458-1468,共11页山地科学学报（英文）

基　　金：the support of the National Natural Science Foundation of China(Grant Nos.52179113,51991392 and 52279119);the Second Comprehensive Scientific Expedition on the Tibetan Plateau(No.2019QZKK0904)。

摘　　要：Yielding support is often used in the squeezing tunnel to prevent damage to the lining induced by large deformation of the surrounding rock.Highly Deformable Elements(HDE)which is often installed along the circumferential direction of the shotcrete lining is a common type of yielding support.To determine the yield parameters of HDE,the support characteristic of the lining using HDE and the ground pressure considering strain-softening of soft rock were analyzed by an analytical method.The analytical solution showed that when considering the strain-softening of squeezing ground,the ground pressure has a non-zero minimum value.The minimum value of ground stress can be used to determine the constant yield stress of the HDE,and the corresponding deformation of the minimum ground pressure can be used to determine the deformation capacity of the HDE.Based on the variation in the design constant yield stress and yield displacement of HDE with the in-situ stress and the mechanical parameters of the soft rock,equations were proposed for determining of the yield parameters of the HDE.

关 键 词：Highly deformable elements Squeezing tunnel Yielding support Strain-softening behavior 

分 类 号：U455.7[建筑科学—桥梁与隧道工程]