Determination of Soil Parameters for Numerical Simulation of an Excavation

doi:10.16183/j.cnki.jsjtu.2016.01.001

Abstract

Abstract:

It is relatively difficlut to determine the parameters adopted in numerical simulation of excavation due to the non-uniformity and uncertainties of soil. In this paper, an inverse analysis method for deep excavation based on the Pareto multiobjective optimization was proposed. The excavation process was first simulated in ABAQUS. A multialgorithm genetically adaptive multiobjective method (AMALGAM) was then invoked by Matlab to identify the soil parameters in excavation with multiple types of field observations. The proposed method was applied to the analysis of a well-instrumented deep well to predict the wall deflection, as well as the ground surface settlement in following excavation with acceptable accuracy. In addition, the nine soil parameters obtained from the inverse analysis on Changshou Road Station excavation were presented, which probably could be uesd as reference for other excavations.

Key words: soil parameter, excavation engineering, numerical analysis, Pareto optimality, displacement prediction

CLC Number:

TU473.2

ZHAO Xiangshan, CHEN Jinjian, HUANG Zhonghui, WANG Jianhua. Determination of Soil Parameters for Numerical Simulation of an Excavation[J]. Journal of Shanghai Jiao Tong University, 2016, 50(01): 1-7.

Figures/Tables 14

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土层	深度／m	γ／（kN·m^-3）	φ／（°）	E／kPa	K₀	υ	c／kPa
①	28.4～35.4	18.7	17.0	170.3	0.5	0.3	50
⑦₂	35.4～41.5	19.1	32.5	212.3	0.5	0.3	4
⑧	41.5～70.0	18.2	19.5	218.1	0.5	0.3	23

土层	深度／m	γ／（kN·m^-3）	λ	K₀	e₀	υ	M	κ
①	0～1.7	18.8	0.1	0.5	0.86	0.3	0.6	0.012
②₁	1.7～3.3	18.8	0.1	0.5	0.93	0.3	0.6	0.010
⑥	24.2～28.4	19.8	0.1	0.5	0.83	0.3	2.0	0.006

土层	深度／m	υ	M	κ
③₂	3.3～6.2	[0.2，0.4]	[0.4，2]	[0.002，0.05]
④₁	6.2～14.0	[0.2，0.4]	[0.4，2]	[0.002，0.05]
⑤_1-1	14.0～24.2	[0.2，0.4]	[0.4，2]	[0.002，0.05]

土层	深度／m	γ／（kN·m^-3）	K₀	e₀	υ
③₂	3.3～6.2	18.3	0.5	1.38	0.3
④₁	6.2～14.0	16.9	0.5	1.06	0.3
⑤_1-1	14.0～24.2	17.9	0.5	0.68	0.3

步骤	υ₃	M₃	κ₃	υ₄	M₄	κ₄	υ₅	M₅	κ₅
2	0.295 2	0.400 0	0.002 0	0.400 0	0.754 6	0.002 0	0.390 0	1.099 7	0.002 0
3	0.200 7	0.401 4	0.002 0	0.400 0	0.718 4	0.002 3	0.369 3	1.037 8	0.002 0
4	0.200 0	0.435 7	0.002 0	0.400 0	0.414 8	0.003 2	0.376 3	0.971 5	0.002 0
5	0.200 0	0.521 6	0.002 0	0.389 7	0.400 0	0.004 0	0.370 2	0.987 9	0.002 1
6	0.200 3	0.400 9	0.002 0	0.396 5	0.434 7	0.003 7	0.361 5	0.906 4	0.002 4
平均值	0.219 2	0.431 9	0.002 0	0.397 2	0.544 5	0.003 0	0.373 5	1.000 7	0.002 1
地勘报告	--	1.134 8	0.002 5	--	0.506 3	0.008 2	--	1.005 3	0.004 1