Analysis of Ground Settlement Induced by Shallow Tunnel Excavation in Composite Layered Strata

被引：0
|
作者：
Yuan R. [1 ]
Xiong W. [2 ]
He Y. [3 ]
Cui K. [2 ]
机构：
[1] Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu
[2] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[3] School of Earth Science and Environmental Engineering, Southwest Jiaotong University, Chengdu
来源：
Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University | 2022年 / 57卷 / 05期
关键词：
constitutive model; numerical simulation; shallow tunnel; surface subsidence;
D O I：
10.3969/j.issn.0258-2724.20210473
中图分类号：
学科分类号：
摘要：
In order to explore the influence of constitutive models on the surface settlement induced by shallow tunnel excavation, the surface settlement trough induced by shallow tunnel excavation in composite layered strata was analyzed considering the friction and critical state soil constitutive model. Firstly, a numerical model of shallow buried tunnel in sand clay composite stratum is constructed on the finite element platform PLAXIS 3D. Three types of constitutive models (i.e., the Mohr-Coulomb model (MC), the modified Cam-Clay model (MCC), and the hardening small strain model (HSS)) and their combinations are utilized. Secondly, the influence of the constitutive model on the width and depth of the ground settlement trough in tunnel excavation is discussed using the parameter equivalent transformation relationship. Finally, the numerical simulation and empirical calculation results of the settlement trough based on the three types of constitutive models and their combined models are compared, and the reasons for their differences are analyzed. The results show that when the HSS model is used for both the upper and lower strata, the maximum settlement and the width of settling trough obtained by numerical simulation are in good agreement with the calculated results by empirical formula, and the difference in the maximum settlement between the two approaches is less than 7.3 mm; when the MC model is used for both the upper and lower strata, an unreasonable phenomenon of surface uplift appears; when the MCC model is used for the lower stratum while the MC model and HSS model are used for the upper stratum, respectively (i.e., when the MC-MCC and HSS-MCC combined models are used), the maximum settlement predicted by numerical simulation is 24.8 mm higher than that calculated by empirical formula, while the settlement trough is "narrow and steep" compared with the empirical result. According to the parametric sensitivity analysis of the HSS model, it is found that a change of 5% in the unloading and reloading modulus and initial shear modulus will lead to a change of 1.5% and 1.0% in the maximum ground settlement, respectively. © 2022 Science Press. All rights reserved.
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页码：1063 / 1069
页数：6
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