Research Progress on Glass Fiber Reinforced Polymer Anchors in Anti-floating Engineering of Underground Structures
ZHENG Chen1, BAI Xiaoyu1,2, ZHANG Mingyi1,2, WANG Haigang1
1 College of Civil Engineering, Qingdao University of Technology, Qingdao, Shandong 266033, China 2 Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao, Shandong 266033, China
Abstract: With the continuous development and utilization of underground space, the buried depth of underground structures is getting larger and larger, and anchoring rock and soil has become a vital part of the project. Due to the frequent occurrence of extreme climate caused by global environmental pollution, many cities often experience a phenomenon of groundwater level surge, which causes greater buoyancy and threatens the overall stability of the building structure.The anti-floating anchor has become a widely popular anti-floating measure because of its advantages such as convenient construction, low cost, short construction period, distributed stress, and good anti-floating effect.Even if the steel anchor is coated with anti-rust layer or anti-corrosion agent such as preservative in the grouting, it is easy to rust in the complex underground environment and cannot be used as a permanent anchor, which has an important impact on the service life of the building. Nowadays, the use of more durable anchors for anti-floating engineering is a hot spot in the industry. Glass fiber reinforced polymer (GFRP) anti-floating anchor has higher tensile strength, superior corrosion resistance and insulation than traditional steel anchors. GFRP anchor is less expensive and cost-effective than AFRP (aramid fiber reinforced polymer) anchor, CFRP (carbon fiber reinforced polymer) anchor, and BFRP (basalt fiber reinforced polymer) anchor. In recent years, it has been highly praised and favored in underground structure anti-floating engineering. Due to the short length of the GFRP material used as the anchor rod, the GFRP anchor rod is seldom used in the anti-floating engineering of underground structures.There is no complete stress transmission mechanism of the anchoring system and research on the bonding performance between the GFRP material and the concrete. The relevant departments have not formulated a technical specification for anti-floating anchor rods suitable for GFRP.But many projects have attempted to use GFRP anchors for anti-floating in underground structures, the trend of replacing steel anchors for geotechnical engineering is also increasing year by year. This review briefly introduces the main components and working principle of GFRP anti-floating anchor, and introduces the experimental research on the anti-floating design of GFRP anchor in underground structure engineering and the research status of numerical simulation analysis based on the test. In addition, this review analyzes and discusses the shortcomings of GFRP anchors in the research and application of anti-floa-ting engineering, and puts forward suggestions for the future development of GFRP anchors in the field of anti-floating engineering.
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2020, Vol. 34 
