Three-Dimensional Numerical Analysis of Soil Nailing for Deep Excavation

doi:10.16183/j.cnki.jsjtu.2011.04.019

Abstract

Abstract:

In order to investigate the deformation characteristics and load transfer mechanism of deep excavation, a numerical model considering the process of stepped excavating and soil nailing was established by FLAC 3D. The lateral displacement of excavation surface and outside soil, the shear strain increment of soil, and the axial force distribution of nail were analyzed. The results show that, the maximum lateral displacement appears close to slope toe, meanwhile, outside corner is the most disadvantageous location of deflection, and the multilevel platforms have positive effects on controlling soil deformation. Tensile failure and shear failure are the two main failure modes of excavation slope. The location of potential sliding surface can be indicated by shear strain increment contour, and the location moves toward the outside end of soil nail due to soil nail reinforcement effects. The maximum axial force of soil nail appears near the middle and the relative minimum value near the two ends, and the distribution of maximum axial force agrees well with the potential sliding surface.

Key words: deep ex cavat ion, soil nailing, fast Lagrangian analysis of continua in 3 dimensions (FLAC3D), three-dimensional nume rical analy sis, deformation, sliding surface

CLC Number:

TU473.2

DING Yong-chun, ZHOU Shun-xin, WANG Jian-hua. Three-Dimensional Numerical Analysis of Soil Nailing for Deep Excavation[J]. Journal of Shanghai Jiao Tong University, 2011, 45(04): 547-552.

Figures/Tables 10

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References 8

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土层编号	厚度/m	γ/(kN·m^-3)	E_s/MPa	E/MPa	ν	c/kPa	φ/(°)
①	4.8	17.8	9.8	45.0	0.33	8	10
②	2.0	18.3	5.2	26.0	0.35	12	14
③	1.5	17.6	4.5	22.5	0.35	13	11
④	18.0	19.1	12.4	62.0	0.35	16	21
⑤	未钻透	19.9	62.3	311.5	0.30	5	32

阶段	计算步	施工工况
初始	Stage0	计算初始地应力，位移清零
第1斜坡	Stage1	挖至-3.3 m，网喷混凝土，施工第1排土钉(-2.5 m)
?	Stage2	挖至-4.9 m，网喷混凝土，施工第2排土钉(-4.6 m)
?	Stage3	挖至-6.5 m，网喷混凝土
第2斜坡	Stage4	挖至-8.9 m，网喷混凝土，施工第3排土钉(-8.1 m)
?	Stage5	挖至-10.6 m，网喷混凝土，施工第4排土钉(-9.8 m)
?	Stage6	挖至-13 m，网喷混凝土，施工第5排土钉(-11.4 m)
第3直坡	Stage7	挖至-15 m，网喷混凝土，施工第6排土钉(-14 m)
?	Stage8	挖至-17 m，网喷混凝土，施工第7排土钉(-16 m)
第4直坡	Stage9	挖至-19 m，网喷混凝土，施工第8排土钉(-18 m)
?	Stage10	挖至-21 m，网喷混凝土，施工第9排土钉(-20 m)

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