Investigating pile anchor support system for deep foundation pit in a congested area of Changchun
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ORIGINAL PAPER
Investigating pile anchor support system for deep foundation pit in a congested area of Changchun Aoxue Chen 1,2 & Qing Wang 1 & Zhida Chen 3 & Jianping Chen 1 & Zhao Chen 2 & Jingang Yang 2 Received: 20 February 2020 / Accepted: 26 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Foundation pit engineering has been developing rapidly with the challenges associated with modern urbanization. As a result, deep excavations can now be performed at the heart of coastal metropolises with dense existing structures and adverse soil and hydraulic conditions. On the other hand, foundation engineering is challenged with sustainability and economic viability such that cost-effectiveness is a key factor provided that the robustness and safety requirements are fully satisfied. This paper presents the design of the retaining system for a deep foundation excavation that is located in a second-tier inland city with less crowed existing structures and good soil and hydraulic conditions. This is representative of the current trend of the suburban development of major cities and the development of below first-tier cities, as a response to the saturating of the major cities. Different designs are reviewed for this case in order to strike the balance between structural capability and cost-effectiveness. The analysis indicates that a hybrid solution is particularly suitable for such type of construction. Specifically, results show that the maximum displacement, bending moment, and shear force in the pit can be reduced by over 50%, 40%, and 30%, respectively, by the combination of soil nailing wall and pile anchor compared with a single support solution. And for the combination of non-prestressed anchor bolts and prestressed anchor cables can effectively save the cost while improving the safety factor of foundation pit during excavation. The findings are instructive to similar projects with cost-effectiveness as a major factor. Keywords Deep foundation pit . Pile anchor support . Composite soil nail wall . Elastic foundation beam . Numerical calculation . Foundation pit deformation
Introduction Modern urbanization and the growing density of buildings, tunnels, and bridges in city centers pose great challenges to foundation constructions, which often require deep excavations while causing minimal disturbance to the surrounding environment (Lim et al. 2020). Engineering failures of foundation pits are most likely catastrophic and therefore must be
* Jianping Chen [email protected] 1
College of Construction Engineering, Jilin University, Changchun 130026, China
2
Key Laboratory of Songliao Aquatic Environment of Ministry of Education, College of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China
3
Changchun Construction Engineering Surveying Co., Ltd, Changchun 130000, China
prevented. Meanwhile, controlling the displacements and ground settlements is nearly equally crucial (Rouainia et al. 2017; Tan and Lu 2017). The most important structural
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