3-D FEM Back-Analysis of an Over Size and Deep Excavation

doi:10.16183/j.cnki.jsjtu.2012.01.010

Abstract

Abstract:

The three dimensional finite element model was built up to simulate an over size and deep excavation traversing shield tunnels, and the effects on surroundings and tunnel heave due to excavation were analyzed. From monitored retaining wall horizontal displacements and tunnel heave, a simplex method was employed for back- analysis of soil parameters. According to the back-analysis program based on simplex method, optimized soil parameters were attained after finite element analysis. The final tunnel heave was predicted by the optimized soil parameters. The results show that the predicted tunnel heave is close to monitored data, which guarantees the effectiveness of back analysis by this paper.

Key words: metro tunnel, excavation, simplex method, heave, back-analysis

CLC Number:

U456

ZHANG Jun-feng, WANG Jian-hua, CHEN Jin-jian, HOU Yong-mao. 3-D FEM Back-Analysis of an Over Size and Deep Excavation[J]. Journal of Shanghai Jiao Tong University, 2012, 46(01): 42-46,52.

Figures/Tables 10

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References 10

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土层	含水量/%	重度/(kN·m^-3)	孔隙比	压缩模量/MPa
③	40.3	17.6	1.127	3.77
③_T	30.2	18.6	0.862	10.13
④	48.6	16.9	1.371	2.46
⑤	34.4	18.1	0.987	4.37
⑥	23.2	19.7	0.674	6.80
⑦₁	30.0	18.6	0.844	11.03
⑦₂	26.9	19.0	0.760	13.30

土层	名称	E_min/MPa	E_max/MPa	E/_MPa
③	淤泥质粉质黏土	3.77	11.31	3.77
③_T	黏质粉土	10.10	30.39	10.10
④	淤泥质黏土	7.30	21.90	7.30
⑤	粉质黏土	13.50	81.00	20.00
⑥	粉质黏土	20.00	120.00	50.00
⑦₁	砂质粉土	35.00	350.00	260.00
⑦₂	粉砂	50.00	500.00	375.00
SMW1	加固土	30.00	120.00	30.00
SMW2	加固土	60.00	300.00	300.00

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