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The Stability Mechanism Research Composite Soil Nailing Structure in Deep Foundation

Author: SiZhanFeng
Tutor: GeKeShui
School: Chinese Geology University (Beijing)
Course: Underground construction
Keywords: Pit Supporting Prestressed anchor - compound soil nailing Numerical Simulation
CLC: TU753
Type: Master's thesis
Year: 2011
Downloads: 86
Quote: 2
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Abstract


With the rapid development of China's national economy, the size of the cities expanding, deep foundation works are also increasing, and the size of the project and technical requirements more and more difficult because of the inherent limitations of traditional soil nailing technology has can not meet the needs of the development of the current era. Composite soil nailing technology as a flexible new support structure, the inheritance and development of traditional soil nailing technique has broad prospects for development. However, at home and abroad for the stability analysis and mechanism of composite soil nailing technique is still not perfect. Engineering examples as background, combined with theoretical analysis and numerical simulation, analog composite soil nailing pit excavation and support of the whole process, the working mechanism of composite soil nailing and slope soil displacement ordinary soil nailing. The stress distribution Variation conducted a preliminary study. On the basis of the existing research results, the first generation of composite soil nailing technology and Research described, and pointed out that some of the problems existing in the compound soil nailing technology research on prestressed bolt composite soil nailing retaining The mechanism of action of its instability mode were discussed; FLAC3D numerical simulation methods, the choice of the Mohr-Coulomb yield criterion to study engineering examples of composite soil nailing and prestressed anchor composite soil nailing structure more the analysis of the system, and to explore the composite soil nailing mechanism pit deformation, stress change existing law. The numerical simulation studies have shown that the whole process of composite soil nailing, the the foundation slope of maximum horizontal displacement occurs in the top of the hill at the prestressed anchor can effectively control the the foundation slope of lateral deformation; levels of excavation slope displacement with the excavation depth increases with increasing, and the increase in speed of displacement with the excavation depth increments, the excavation of the subsoil have a greater impact on the upper layer has been supporting the free face; composite soil nailing structure Rally role and internal forces of the uneven distribution of soil nailing and prestressed anchor bear most of the load, so that the range of the supporting soil under low stress, and give full play to the role of stress transfer and diffusion, improved soil stress concentration; excavation foot of the slope at the stress concentration is more serious in the the actual supporting design and construction process, should be monitored closely to the foot of the slope at to non overbreak and timely support.

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CLC: > Industrial Technology > Building Science > Construction > The project and the type of work > Foundation engineering
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