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《China Civil Engineering Journal》 2007-08
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An experimental study on the performance of FRP soil nails

Huang Shengwen1 Qiu Xianhui1 He Weiping2 Liu Tingwang1 (1. Changsha University of Science and Technology, Changsha 410076, China; 2.Shenzhen Oceanpower Engineering Technology Co.,Ltd., Shenzhen 518004,China)  
The main characteristics of a new type of FRP soil nail are introduced. Laboratory studies on the tensile strength and the grouted bonding strength of the FRP rod and in-situ tests on the pull-out bearing capacity of FRP soil nails are carried out. Their failure features are described and analyzed. The test results indicate that the tensile strength of FRP rod, as high as 550MPa, can be evaluated by using a formula of modified mixture rule. The rod failure appears brittle, the fibers in the rod are ruptured after the resin matrix around the fibers cracked, and the fracture assumes an irregular brush shape. The bond strength between FRP rod and mortar is determined by the shear strength of mortar, the distribution of bond stress along FRP rod is non-uniform, and the maximum bond stress is more centralized than that of steel rod. The deformation of FRP soil nails is basically elastic, the ultimate anti-pull out bearing capacity is controlled by the shear resistance between soil nail surface and soil mass for the shorter nails in the in-situ test, and the value is 10% higher than the yielding tensile resistance of HRB335 steel rod of the same diameter. Therefore, FRP soil nails can be widely applied in the retaining structures of foundation excavation and the reinforcement of slopes, especially under corrosive environments such as polluted and saline soils.
【Fund】: 湖南省自然科学基金(05JJ30188)
【CateGory Index】: TU411
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