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FLAC3D Simulation and Field Testing of Deep Excavation Supported by Soil Nail Walls

Author: ZhangMingMin
Tutor: WangGuiHe
School: Chinese Geology University (Beijing)
Course: Geological Engineering
Keywords: Steel pipe piles Prestressed anchor Composite soil nailing walls FLAC3D
CLC: TU476
Type: Master's thesis
Year: 2011
Downloads: 251
Quote: 1
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Abstract


Ahead of steel pipe piles prestressed bolt composite soil nailing wall supporting a new kind of technology is the use of joint support in the form of steel pipe piles, prestressed anchor and soil nailing. It can effectively control the foundation pit deformation significantly improve the stability of the excavation slope. The Combined Support small field test data is extremely scarce, finite element analysis are mostly consider the plane problem caused by the limited understanding of its force-deformation characteristics. The this paper Yuelin Building deep foundation pit ahead of steel pipe piles prestressed anchor-compound soil nailing wall engineering field test, use, create a three-dimensional numerical model based on the finite difference method FLAC 3D simulation software, calculated in accordance with the foundation pit excavation and support order, support system and construction process parameters on Pit Supporting Structure stability and deformation control, to provide a reference for the design and construction of similar projects. Content with the outcome of this paper are as follows: (1) Joint Support Mechanism elaborated. High strength and stiffness of steel pipe piles, advance support and excavation retaining dual role to play in the construction; cross-tie of anchor and soil nailing, stress transfer and diffusion, regulate soil deformation, to achieve flexible support purposes. Three through the surface layer the soil close alliance to jointly bear the load of soil weight and surface maintenance of stability and deformation of the pit. (2) engineering field test. The joint supporting role, the the pit excavation face at the top and the middle and lower parts of the horizontal displacement, approximately 10 mm. The prestressed anchor anchor head axial force at any time due to water leakage process changes have significantly raised phenomena final tension values ??stabilized at between 55 ~ 80 kN. In addition to individual soil nailing, soil nails along the length of the force showed \The test showed that the slope deformation, Combined Support stability control pit effect. (3) FLAC 3D numerical analysis. The pit excavation surface modeling calculated maximum horizontal displacement was 12.48 mm, occurs in the lower part of the slope; slope surface settlement was \Prestressed anchor force characteristics of non-anchor segment basic Hengli, anchoring segment axial force showed an attenuation trend. Soil nail axial force was like distribution Zaohe. In general, pit deformation and the support member by force with the measured results are basically the same, indicating that the FLAC 3D numerical analysis method is more reasonable. (4) foundation stability of influencing factors. The analysis showed that the increased steel pipe pile embedded depth within a certain range, pile stiffness, pile spacing, to take a step-by-step excavation to reduce ground overloading are conducive to reducing deformation of foundation pit strengthen the foundation stability. Basically rational design of the foundation pit support, optimization advice may be 3 rows anchor, 6 rows of soil nailing programs, to facilitate construction and reduce the project cost.

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