Issue 45

X. Z. Wang, Frattura ed Integrità Strutturale, 45 (2018) 100-107; DOI: 10.3221/IGF-ESIS.45.08 100 Research on anchor service life base on grey prediction model Xinzheng Wang Academy of Civil Engineering and Architecture, Nanyang Normal University, Nanyang 473061, China wxz791023@126.com A BSTRACT . With the wide application of anchored structures in various engi- neering, their durability and service life have become an important issue in the development of anchoring technique. According to the corrosion experiment results on different working conditions (close and damp, permanently soaked in water, wet and dry alternately, weak acidity aqueous soaking), and on the basis of determining the loss rate threshold of anchor steel reinforcement bearing capacity, this paper first test the experiment data and then predict the service life of anchor steel on four different working conditions by adopting GM (1,1) model. The results indicate that the grey prediction has high accura- cy. K EYWORDS . Anchor; Service life; Grey prediction; GM (1,1) . Citation: Wang, X.Z., Research on anchor service life base on grey prediction model, Frattura ed Integrità Strutturale, 45 (2018) 100-107. Received: 29.03.2018 Accepted: 11.06.2018 Published: 01.07.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION he bolt and cable supporting is convenient and fast in construction, low in cost and adaptable to engineering [1-3]. It is widely used in rock and soil slope supporting engineering in water conservancy and hydropower, railway, highway, construction and other industries. In the course of using the anchor structure, how long their residual life is, and whether they will suddenly failure one day has become a common concern. Therefore, it is of great importance significance to study the durability and service life of the anchor. By combining the indoor experiment with theoretical analysis, this paper analyzes the experimental result indoors through the use of Grey Theory, and based on the experi- mental result of limit tension anchor rod on site, studies the durability and service life of anchored structures. According to the corrosion experiment results on different work condition (close and damp, permanently soaked in water, wet and dry alternately, weak acidity aqueous soaking)) and on the base of determining the critical breakage of carrying capacity loss rate, this paper first examines the experiment data and then predict the service life of anchor rod on 4 different work conditions by adopting GM(1,1) model. At last, the predicting result is compared with the testing result of the anchor rod. The results indicate that the grey prediction has high accuracy. O VERVIEW OF GREY SYSTEM THEORY The concept of grey prediction he Grey Theory studies few data and indetermination. It understands and knows the world by creating and open- ing out the “part” known information, and then it can correctly hold and depict the functional behavior and evo- lutive rules of the system. It can successfully solve many practical problems in production, life and scientific re- T T