Deformation of a Collinear Tunnel Induced by Overlying Long-Distance Excavation

doi:10.16183/j.cnki.jsjtu.2020.026

Abstract

Abstract:

Overlying excavation will inevitably cause uplift of the existing tunnel due to the stress relief and rebound of soil, and the impact will be more significant when the long-distance is in line. Based on the Timoshenko simplified model of tunnel which considers the shearing dislocation between rings, and combining with the Winkler foundation model, an analytical model for soil-tunnel interaction analysis of overlying excavation was established. Based on the superposition principle, the model proposed was applied to a case study of tunnel deformation induced by overlying long-distance collinear excavation. By comparing the calculated results with the measured data, the accuracy of the proposed model was verified. The analysis results show that after the construction of the upper main structure, the uplift deformation of the tunnel has significantly decreased, but the local differential settlement increases, resulting in a significant increase in the internal force of the tunnel and the deformation of the annular joint. The groundwater leakage generally occurrs not at the location with the maximum uplift of tunnel, but between the location with the maximum opening of joint and the location with the maximum shearing dislocation. As a result, not only the total deformation but also the opening and dislocation deformation of joints caused by differential settlement should be concerned in practice. Although the shear deformation generally accounts for about 21.41% of tunnel deformation, the induced shearing dislocation is significant compared with the opening caused by bending, which can be more important for waterproof in joints. The analytic model should not neglect the shearing deformation of the tunnel.

Key words: excavation, tunnel, analytical model, uplift deformation, shearing dislocation

CLC Number:

TU753
U456.3

CHEN Shuan, WU Huaina, CHEN Renpeng, SHEN Shuilong, LIU Yuan. Deformation of a Collinear Tunnel Induced by Overlying Long-Distance Excavation[J]. Journal of Shanghai Jiao Tong University, 2021, 55(6): 698-706.

Figures/Tables 13

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管片参数	数值	纵向螺栓参数	数值
D_e/m	6.70	n	16
t/m	0.35	D_b/m	0.03
l_s/m	1.50	l_b/m	0.40
E_s/GPa	34.50	E_b/GPa	206
ν_s	0.20	ν_b	0.30

参数	γ_s/(kN·m^-3)	e₀	w₀/%	c₀/kPa	φ₀/(°)	E_s0/MPa
素填土	17.5	—	—	0	12	—
粗砂	20.0	—	—	0	30	30
砾质黏土	17.7	1.004	33.3	25	23.5	28
全风化花岗岩	19.5	0.865	27.6	30	28	70

工况	L_e/m	H_e/m
1-1	73~99	12.0
1-2	158~188	8.0
2-1	73~99	16.3
2-2	197~207	16.3
2-3	167~197	10.0
3-1	73~99	16.3
3-2	151~207	16.3
4-1	73~107	16.3
4-2	144~213	16.3
4-3	107~144	11.3
4-4	157~197	主体结构施工

工况	S/m	w/mm	w_s/mm	P/%
1-2	87	6.59	1.78	27.04
1-2	173	6.70	1.59	23.68
2-3	87	9.21	2.47	26.86
2-3	198	16.32	5.10	31.23
3-2	87	9.20	2.39	26.00
3-2	179	16.40	1.61	9.83
4-4	87	8.95	0.91	10.13
4-4	141	20.28	3.28	16.19
4-4	212	19.49	4.23	21.72
			平均	21.41