Numerical Analysis of Ground Settlement Patterns Resulting from Tunnel Excavation in Composite Strata

Applied Sciences

Zhizhen Liu¹  Huijuan Deng¹  Yinzhu Liu¹  Ping Cao¹  Weiping Xie²  Gang Meng²  Zhi Fan² 

[1] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;Sinohydro Engineering Bereau 8 Co., Ltd., Changsha 410004, China;

关键词: cross-river tunnel excavation;    composite strata;    ground settlement;    numerical modeling;   

DOI  :  10.3390/app12115479

来源: DOAJ

【 摘 要 】

Cross-river twin tunnels are prone to deformation and uneven settlement of the surrounding soil due to the complexity of the strata crossed, which has a negative impact on the tunnel structure. A numerical calculation model was established using the COMSOL Multiphysics to study the effects of twin tunnel excavation in composite strata on the ground settlement and the ground settlement pattern. The results indicated that after the construction of the twin tunnels is completed, the ground settlement above the first tunnel is slightly larger than the ground settlement above the second tunnel. The further the spacing between the two tunnels before and after excavation, the smaller the amount of ground settlement and the impact on the surrounding soil. The ground settlement value increases with the increase in burial depth, and the ground settlement curve gradually changes from a W-shaped curve to a V-shaped curve. As the distance between the two tunnels increases, the maximum settlement value of the settlement curve gradually decreases, and the ground lateral settlement curve changes from V-shaped to W-shaped. The higher the water level on the riverbed side, the greater the settlement value of the ground.

【 授权许可】

Unknown