| During about a century of development, anchoring technique has been one of the most important supporting measures in geotechnique engineering field. Anchor bold is the most important structure element of anchor system, whose physico-mechanical properties play an important role in stability and durability of rock-soil mass. The common anchor bolts are widely used because of its excellent physical mechanics, especially in the areas of excavation engineering, slop project, underground engineering, port and dam project, supporting structure, consolidation of abutment project an so on. However, through practice, found many problems in steel bolt used as permanent supporting structure, such as the great self weight, hard to transport and install, poor corrosion resistance. The defects have an influence on its usage in some areas.GFRP bolt is a kind of anchor bolt that made of new material. It has the characteristic of light in quality, high strength, good corrosion resistance, good workability and high fatigue restraint ability and so on. GFRP bolt rods used as supporting engineering instead of common steel bolt rod can overcome some disadvantages of steel anchor rods, and promote the development as well as the application of anchors technology.Nowadays, through the study of anchoring machine theory, research at this stage of fiberglass bolt anchoring mechanism, analysis of the glass fiber binding bolt stress distribution, the distribution function. Based on the research of the physical and mechanical properties of glass fiber bolt, determine the damage form of fiberglass bolt there have been many cases of successful GFRP bolt application both in China and abroad.However,only a few theoretical studies on GFRP bolts are carried out. To speed up the promotion of GFRP bolting technology, we should strengthen the research in the fields of tunnel, slop and underground engineering. The GFRP bolt theoretical study including two aspects. In macroscopic aspect, it mainly studies the carrying capacity, and the physical mechanics parameter of rock-soil body after reinforcing the anchorage system; in microscopic, it starts from the load transfer of anchorage system, which studies the stress, strain distribution and the transfer rule of the anchorage lower edge length of the load action. It focuses on the research of the bolt-rod and grouting, grouting and the physical and mechanical properties on the interface of rock-soil body. The above two interfaces are the key factors of controlling the anchorage system, which can insure the system work properly.By doing orthogonal experiment with GFRP bolts, the paper studied the anchor diameter, anchor length, anchor bolt diameter and mortar strength factors’ impact on anchoring force. The key factors for the anchorage system mechanical index are determined by range analysis and variance analysis. The paper is intended to come up with the function relationship between GFRP bolt bearing capacity, average bond stress and the key factors by doing regression analysis. The paper provides reference to important physical parameters of similar soil anchors. The paper combines the existing theoretical achievements and engineering practice to study the bolts anchoring mechanism and he failure mode of anchorage system. Using the mature software Flac3 D stimulates the double side drift method to construct. By testing the index of surrounding rocks stress, strain and displacement to evaluate the feasibility of GFRP anchors used as systematic anchors and temporary anchors. |
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