Study on the Uplift Resistance of a Joint Board Cable Foundation Considering the Critical Burial Depth
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RESEARCH PAPER
Study on the Uplift Resistance of a Joint Board Cable Foundation Considering the Critical Burial Depth Yi-Ping Luo1 • Rui Bai1 • Yan-Long Li1
•
Guo-Bin Xue2
Received: 15 January 2020 / Revised: 20 July 2020 / Accepted: 2 September 2020 Ó Iran University of Science and Technology 2020
Abstract Joint board cable foundation is a kind of foundation form proposed by the author which is applied to transmission lines. In the study of pullout resistance of a joint board cable foundation, the most important factor is the critical depth of the anchor plate. Theoretical analyses, numerical simulations, and field tests were carried out to study the impact of the critical burial depth on the uplift capacity. Test results were corrected by the back-stepping cohesive force method. The theoretical analyses, numerical simulations, and field test results are consistent. It is found that the development of the plastic failure zone in the foundation is directly controlled by the shear strain. Through the field test, the pullout resistance of the anchor plate is studied, and it is found that the depth ratio has the most influence on the pullout capacity of the anchor plate. The field tests also provide valuable data for theoretical calculation, numerical simulation, and design of joint board cable foundations. The field test data analysis and numerical simulation results show that the optimal burial depth ratio of the joint board cable foundation is about 2.5–3.0. Therefore, in the design of the joint board cable foundation, 2.5 can be adopted as the critical depth ratio of the joint board cable. Keywords Joint board cable foundation Plastic failure zone Depth ratio Ultimate pullout capacity
1 Introduction Because of inherent defects, the sinking and destruction of transmission tower foundations occur frequently in loess ground. To improve the stability and safety of such foundations, the author proposed a joint board cable foundation (Fig. 1) and obtained a patent for this foundation. The
& Yan-Long Li [email protected] Yi-Ping Luo [email protected] Rui Bai [email protected] Guo-Bin Xue [email protected] 1
State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, Shanxi, People’s Republic of China
2
State Grid Gansu Electric Power Company Economic Technology Research Institute, Gansu 730050, People’s Republic of China
foundation is mainly composed of three parts: upper plate, anchor cable and lower plate. Flexibility makes it have better resistance to dynamic load. This foundation achieves the purpose of saving materials by using the mechanical properties of different materials, thereby reducing the cost. From the perspective of its construction technology, the foundation construction method is simple and has strong construction adaptability. When removing it, only the anchor cable needs to be cut off and the upper slab is dug out, which greatly reduces the workload. Under certain working condition
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