Mechanism Analysis of Influence of Deep Excavation on Deformation of Nearby Cut-and-cover Tunnel

doi:10.16183/j.cnki.jsjtu.2018.11.004

Abstract

Abstract:

A practical numerical example is used to simulate the excavation process of a deep foundation pit in Shanghai, and the rationality of the model is verified by comparing with the measured data. The cross wall between tunnel and diaphragm wall is studied and the influence of cross wall is discussed. By analyzing the vertical displacement of adjacent walls and the displacement of soil on both sides of diaphragm walls, the interaction principle between diaphragm wall and tunnel or diaphragm wall and soil is obtained. The force distribution of the wall in the excavation process is used to reveal the influence principle of adjacent deep excavation on underground structure (cut-and-cover tunnel). The results show that the uplift of the tunnel is mainly caused by the uplift of the nearby diaphragm wall. The influence of the diaphragm wall on the cut-and-cover tunnel is obviously greater than that of the surrounding soil. Under the influence of deep excavation, the reason for the diaphragm wall uplifting is that the friction force in the foundation pit is larger than that of outside the pit.

Key words: foundation pit, tunnel, diaphragm wall, vertical displacement, axial force, friction

CLC Number:

TU473

XIAO Xiao, LI Mingguang, XIA Xiaohe, WANG Jianhua. Mechanism Analysis of Influence of Deep Excavation on Deformation of Nearby Cut-and-cover Tunnel[J]. Journal of Shanghai Jiao Tong University, 2018, 52(11): 1437-1443.

Figures/Tables 12

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References 12

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层号	名称	w／％	γ／（kN·m³）	e	c／kPa	φ／（°）	E／MPa
①	填土	?	?	?	?	?	20.0
②	粉质黏土	27.4	18.0	0.94	17	24.0	38.5
③	粉质黏土	34.7	17.2	1.18	17	24.0	40.0
④	淤泥质粘土	48.6	17.0	1.43	14	12.5	71.0
⑤	粉质黏土	34.2	18.2	1.03	17	18.5	99.0
⑥	粉质黏土	22.5	19.9	0.71	57	17.5	139.0
⑦₁	粉细沙	29.9	18.9	0.84	0	35.5	203.0
⑦₂	粉细沙	27.1	19.1	0.76	25	37.5	282.0
⑨₁	粉细沙	25.9	19.7	0.68	25	37.5	357.0

模型	开挖层	竖向位移／mm
模型	开挖层	隧道	墙2
1	1	1.25	1.70
?	2	2.95	3.20
?	3	3.96	4.50
?	4	6.10	6.40
?	5	6.60	6.92
2	1	1.00	1.30
?	2	2.45	2.60
?	3	3.30	3.70
?	4	5.20	5.70
?	5	5.60	6.13

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