基于修正硬化模型的软土深基坑变形数值分析

Abstract
Figure/Table
References (12)
Related Citation (15)

Download: PDF (1950 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract Ideal elastoplastic model used in deformation analysis induced by underground engineering excavation leads to inaccurate prediction. Based on modified hardening soil model，considering the effect of small strain condition on soil behavior，a case study of deep excavation on the deformation of diaphragm wall and settlement of ground surface is numerical analyzed. The results show：according to the movement of diaphragm wall，the prediction result by using ideal elastoplastic mode—Mohr-Coulomb(MC) model is larger than observed deformation，and especially the part below the base of excavation. The result obtained from hardening soil model is consistent with but a little larger than the observed deformation. For the prediction of surface settlement，the trough obtained from MC model is deeper and wider than that obtained from modified hardening soil model，and the settlement from hardening soil model is larger. In general，because modified hardening model can be used to simulate the variation of soil behavior such as modulus and small strain during different loading and unloading states，modified hardening model is superior to MC model and hardening soil model whether in value and regular of deformation prediction.

Key words： soil mechanics soft soil modified hardening soil model excavation deformation small-strain

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	CUI Wei
	WANG Ning
	SONG Huifang

Cite this article:

CUI Wei,WANG Ning,SONG Huifang. DEFORMATION NUMERICAL ANALYSIS OF DEEP EXCAVATION IN SOFT SOIL BASED ON MODIFIED HARDENING MODEL[J]. , 2013, 32(s2): 4041-4047.

URL:

https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/4041

[1] WHITTLE A J，HASHASH Y M A，WHITMAN R V. Analysis of deep excavation in Boston[J]. Journal of Geotechnical Engineering，1993，119(1)：69–90.

[2] NG C W W，YAN W M. A true three-dimensional numerical analysis of diaphragm walling[J]. Geotechnique，2000，49(6)：825–834.

[3] WONG K S，BROMS B B. Lateral deflection of braced excavation in clays[J]. Journal of Geotechnical Engineering，1990，115(6)：853–870.

[4] ADDENBROOKE T I，POTTS D M，PUZRIN A M. The influence of pre-failure soil stiffness on the numerical analysis of tunnel construction[J]. Geotechnique，1997，47(3)：693–712.

[5] HEJAZI Y，DIAS D，KASTNER R. Impact of constitutive models on the numerical analysis of underground constructions[J]. Acta Geotechnica，2008，3(4)：251–258.

[6] 徐中华，王卫东. 敏感环境下基坑数值分析中土体本构模型的选择[J]. 岩土力学，2010，31(1)：258–264.(XU Zhonghua，WANG Weidong. Selection of soil constitutive model for numerical analysis of deep excavations in close proximity to sensitive properties[J]. Rock and Soil Mechanics，2010，31(1)：258–264.(in chinese))

[7] BURLAND J B. Ninth laurits bjerrum memorial lecture：small is beautiful—the stiffness of soils at small strains[J]. Canadian Geotechnical Journal，1989，26(4)：499–516.

[8] KUNG G T C，OU C Y，JUANG C H. Modeling small-strain behaviour of Taipei clays for finite element analysis of braced excavations[J]. Computer and Geotechnics，2009，36(1)：304–319.

[9] SCHANZ T，VERMEER P A，BONNIER P G. Formulation and verification of the hardening-soil model[C]// Beyond 2000 in Computational Geotechnics. Rotterdam：A. A. Balkema，1999：281–290.

[10] BENZ T，VERMEER P A，SCHWAB R. A small-strain overlay model[J]. International Journal for Numerical Analytical Methods in Geomechanics，2009，33(1)：25–44.

[11] HARDIN B O，DRNEVICH V P. Shear modulus and damping in soils：design equations and curves[J]. Journal of the Soil Mechanics and Foundations Division，1972，98(7)：667–692.

[12] HSIUNG B C. Engineering performance of deep excavations in Taipei[Ph. D. Thesis][D]. Bristol，UK：University of Bristol，2002.