Abstract
As a new type of bolt, the polycystic aeration bolt has a broad application prospect in soft soil area; however, its design and production are still in the stage of constant exploration and improvement. From the perspective of bolt material and engineering cost, the important components of the polycystic aeration bolt were analyzed by combination with the existing bolt models, and a new structural design scheme of a kind of polycystic aeration bolt which can be used in practical engineering was presented in this paper. Then, the stress and failure mode of this bolt were discussed, and the theoretical equation of the bearing capacity was derived by using the elastic-plastic theory. In addition, the assembly and fabrication technology of this bolt in practical foundation pit engineering was described in detail. Finally, the field pull-out test of the polycystic aeration bolt was carried out, and the test results were compared with those of the conventional grouting bolt, which indicated that this new bolt has a greater advantage in bearing capacity than the conventional grouting bolt, verifying the feasibility of the structural design scheme of the polycystic aeration bolt proposed in this paper.
Highlights
China has a vast territory with complex and diverse geological and geomorphic conditions [1, 2], where soft soil layers are widely distributed, such as in the areas of Shanghai, Wuhan, and Nanjing in the Yangtze River basin and Guangzhou in the Pearl River Delta [3,4,5]
By aerating the rubber film to form the expansion anchorage section, it Advances in Civil Engineering can effectively improve the bearing capacity of the bolt, control the structural deformation, and increase the shear strength of the surrounding soil, which brings a positive impact on the bolt support in soft soil area [23, 24]
Numerical simulation and laboratory test are widely used in geotechnical engineering [26,27,28,29], the research on this new bolt is still in the laboratory test stage, the field test has not been implemented [30], and the anchorage performance of the bolt in the actual foundation pit engineering in soft soil layer has not been verified yet. To apply this new bolt into practical application, give full play to its advantages different from the ordinary bolt, and provide the theoretical support and design basis, this paper proposed a new polycystic aeration bolt design by optimizing the structure size and the assembly materials of existing bolt production technology and conducted experimental studies, analyzed the corresponding mechanical model and anchorage mechanism, and compare the anchorage efficacy with grouting bolt through field pull-out tests, which verified the feasibility of the proposed bolt
Summary
Field Experiment Research of the Polycystic Aeration Bolt: Model Design and Anchorage Mechanism. From the perspective of bolt material and engineering cost, the important components of the polycystic aeration bolt were analyzed by combination with the existing bolt models, and a new structural design scheme of a kind of polycystic aeration bolt which can be used in practical engineering was presented in this paper. The field pull-out test of the polycystic aeration bolt was carried out, and the test results were compared with those of the conventional grouting bolt, which indicated that this new bolt has a greater advantage in bearing capacity than the conventional grouting bolt, verifying the feasibility of the structural design scheme of the polycystic aeration bolt proposed in this paper
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