Study on the variation characteristics of the anchor cable prestress based on field monitoring in a foundation pit
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ORIGINAL PAPER
Study on the variation characteristics of the anchor cable prestress based on field monitoring in a foundation pit Zhongping Yang 1,2 & Shiqi Li 2 & Yu Yu 1,2 & Xinrong Liu 1,2 & Yuanxin Hu 3 Received: 24 July 2020 / Accepted: 14 November 2020 / Published online: 26 November 2020 # Saudi Society for Geosciences 2020
Abstract Field monitoring was conducted on the variation of the tension in prestressed anchor cables used in a foundation pit engineering. Based on quite a few data obtained from in-site monitoring and other literature, the variation features of anchor tension were summarized concerning the install positions on a single anchor pile, anchoring strata, and locations on the plane of the foundation pit. The tension in selected anchor cables was monitored during the whole construction process from their locking to the completion of the whole construction. The results show that the anchor tension of anchor cables shows a three-stage variation. Anchor tension in cables decreases dramatically in a short period after the locking stage. Afterward, it fluctuates during the partial construction of the foundation pit which could mainly be attributed to the excavation of the subsoil close to the cables as well as the locking of the cables underneath. Finally, it tends to be stable after the completion of the whole construction. The strata condition of the cable anchored in and the position of the cable on the plane of the foundation pit would significantly affect the final anchor tension as the cables stabilized. The better the geological conditions of the anchoring strata and the closer the anchor cable is to the middle of the foundation pit slope, the greater the final anchor tension. Keywords Foundation pit engineering . Field monitoring . Anchor tension . Different strata . Different plane locations . Variation characteristics
Introduction Responsible Editor: Zeynal Abiddin Erguler * Zhongping Yang [email protected] Shiqi Li [email protected] Yu Yu [email protected] Xinrong Liu [email protected] Yuanxin Hu [email protected] 1
Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400030, China
2
School of Civil Engineering, Chongqing University, Chongqing 400045, China
3
Extension Project Headquarters, Chongqing Airport Group Co., Ltd., Chongqing 401120, China
As there is continuous development of high-rise buildings and subway stations in urban areas, the scale of urban underground space development increases, leading to the increasing number of deep foundation pit projects as well (Li et al. 2012). Among engineering support structures, the pile-anchor retaining structure is more and more widely used due to its convenient construction and excellent supporting ability (Wang et al. 2013, 2014; Johnson and Sandeep 2016). Furthermore, prestressed anchor cable is an important part of the pile-anchor supporting system. It utilizes the self-stability of the rock and/or soil mass of the cables anchored in to share the
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