地面堆载对既有隧道影响离心试验和数值分析

doi:10.16183/j.cnki.jsjtu.2020.412

摘要/Abstract

摘要：

地面堆载对地下既有隧道的安全稳定影响显著,软黏土地区相关规范对堆载引起的隧道位移限制十分严格.为了准确评估软黏土地区地面堆载对隧道位移的影响,首先通过离心模型试验研究了地面堆载对隧道位移和土体变形的影响规律,然后基于离心模型试验建立了相应的有限元模型,通过室内土工试验确定了土体本构模型的参数取值,从土体应变和剪切刚度等方面对比分析了HS模型和HSS模型在研究软黏土地层地面堆载问题中的适用性.在此基础上,综合考虑堆载规模和隧道位置等参数,进一步探讨了地面堆载对软黏土地层变形和隧道位移的影响,相关研究成果可以为工程设计提供参考.

关键词: 地面堆载, 离心模型试验, 小应变本构模型, 数值模拟

Abstract:

Surface surcharge has a significant impact on the safety and stability of existing underground tunnels, and relevant regulations in soft clay areas have very strict restrictions on the tunnel displacement caused by surface surcharge. In order to accurately assess the impact of surface surcharge on the tunnel displacement in soft clay areas, the influence of surface surcharge on tunnel displacement and soil deformation is studied by using the centrifugal model test, and a corresponding finite element model is established based on the centrifugal model test. The parameter values of the soil constitutive model are determined by indoor soil tests. From the aspects of soil strain and shear stiffness, the applicability of the HS model and the HSS model in the analysis of the soft clay surface surcharge problem is compared and analyzed. Based on the result, the influence of surface surcharge on the deformation of soft clay formation and tunnel displacement is further discussed while comprehensively considering the size of the surface surcharge and the location of the tunnel. The results can provide some reference for engineering design.

Key words: surface surcharge, centrifugal model test, small-strain constitutive model, numerical simulation

中图分类号:

U459

刘谨豪, 严远忠, 张琪, 卞荣, 贺雷, 叶冠林. 地面堆载对既有隧道影响离心试验和数值分析[J]. 上海交通大学学报, 2022, 56(7): 886-896.

LIU Jinhao, YAN Yuanzhong, ZHANG Qi, BIAN Rong, HE Lei, YE Guanlin. Centrifugal Test and Numerical Analysis of Impact of Surface Surcharge on Existing Tunnels[J]. Journal of Shanghai Jiao Tong University, 2022, 56(7): 886-896.

图/表 25

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表1

本构模型参数

地层	c/kPa	ϕ/(°)	$E o e d r e f$ /MPa	$E 50 r e f$ /MPa	$E u r r e f$ /MPa	G₀/MPa	γ_0.7×10⁴	ψ/(°)	p^ref/kPa	R_f	K₀	m	ν_ur
4-1	10	25	2.15	2.58	14.5	27.0	2.7	0	100	0.7	0.57	1	0.3

表1

表2

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