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A platform for research: civil engineering, architecture and urbanism
Research of jacked pile penetration test based on airbag loading
https://orcid.org/0000-0002-7891-6559
Abstract In view of the problem that the model test of pile jacking cannot reproduce the soil's self-gravity and thus cannot truly reflect the pile jacking force, this paper developed an airbag loading system. The airbag is used to pressurize and simulate the overburden soil weight. The method of subsection pile jacking and coupling is ingenuously adopted to achieve long pile penetration. Because the airbag and pressure can be controlled well, it is convenient to simulate the cohesive soil foundation. The size of the model pile used in the test is larger than that of the usual centrifugal model test pile, so it belongs to large scale model test. The experimental results using this system show that the pile jacking force increases with the increase of penetration depth. The degradation of pile lateral resistance has little impact on pile jacking force. After modification based on the degradation theory of pile lateral resistance, the overall variation law of pile lateral resistance is good, and the difference value generated at the joint of pile segments is basically 0. With the increasing of pile depth, the pile lateral resistance is gradually exerted. The pile end resistance fluctuates with the depth, and accounts for a relatively high proportion of pile jacked force, which is maintained above 50%. The method of pile jacking with airbag loading in this paper provides a new idea for the study of the penetration characteristics of jacked pile.
Highlights The paper innovatively simulated the overburden of soil by using the air bag loading method, and at the same time used the large-scale model pile to simulate the pile jacking process in laboratory. A full-section earth pressure sensor was installed at the end of the model pile to obtain the accurate end resistance during pile jacking. Through section pile jacking, the pile jacking force, pile end resistance and pile lateral resistance of each section of pile jacking process are analyzed. Finally, the whole pile jacking process is realized by coupling and superposition of the three sections of pile jacking process. Based on the section pile jacking and pile lateral friction degradation theory, the degradation coefficient of pile lateral friction is deduced, and the force mechanism and influencing factors of pile lateral friction degradation are analyzed.
Research of jacked pile penetration test based on airbag loading
https://orcid.org/0000-0002-7891-6559
Abstract In view of the problem that the model test of pile jacking cannot reproduce the soil's self-gravity and thus cannot truly reflect the pile jacking force, this paper developed an airbag loading system. The airbag is used to pressurize and simulate the overburden soil weight. The method of subsection pile jacking and coupling is ingenuously adopted to achieve long pile penetration. Because the airbag and pressure can be controlled well, it is convenient to simulate the cohesive soil foundation. The size of the model pile used in the test is larger than that of the usual centrifugal model test pile, so it belongs to large scale model test. The experimental results using this system show that the pile jacking force increases with the increase of penetration depth. The degradation of pile lateral resistance has little impact on pile jacking force. After modification based on the degradation theory of pile lateral resistance, the overall variation law of pile lateral resistance is good, and the difference value generated at the joint of pile segments is basically 0. With the increasing of pile depth, the pile lateral resistance is gradually exerted. The pile end resistance fluctuates with the depth, and accounts for a relatively high proportion of pile jacked force, which is maintained above 50%. The method of pile jacking with airbag loading in this paper provides a new idea for the study of the penetration characteristics of jacked pile.
Highlights The paper innovatively simulated the overburden of soil by using the air bag loading method, and at the same time used the large-scale model pile to simulate the pile jacking process in laboratory. A full-section earth pressure sensor was installed at the end of the model pile to obtain the accurate end resistance during pile jacking. Through section pile jacking, the pile jacking force, pile end resistance and pile lateral resistance of each section of pile jacking process are analyzed. Finally, the whole pile jacking process is realized by coupling and superposition of the three sections of pile jacking process. Based on the section pile jacking and pile lateral friction degradation theory, the degradation coefficient of pile lateral friction is deduced, and the force mechanism and influencing factors of pile lateral friction degradation are analyzed.
Research of jacked pile penetration test based on airbag loading
https://orcid.org/0000-0002-7891-6559
Abstract In view of the problem that the model test of pile jacking cannot reproduce the soil's self-gravity and thus cannot truly reflect the pile jacking force, this paper developed an airbag loading system. The airbag is used to pressurize and simulate the overburden soil weight. The method of subsection pile jacking and coupling is ingenuously adopted to achieve long pile penetration. Because the airbag and pressure can be controlled well, it is convenient to simulate the cohesive soil foundation. The size of the model pile used in the test is larger than that of the usual centrifugal model test pile, so it belongs to large scale model test. The experimental results using this system show that the pile jacking force increases with the increase of penetration depth. The degradation of pile lateral resistance has little impact on pile jacking force. After modification based on the degradation theory of pile lateral resistance, the overall variation law of pile lateral resistance is good, and the difference value generated at the joint of pile segments is basically 0. With the increasing of pile depth, the pile lateral resistance is gradually exerted. The pile end resistance fluctuates with the depth, and accounts for a relatively high proportion of pile jacked force, which is maintained above 50%. The method of pile jacking with airbag loading in this paper provides a new idea for the study of the penetration characteristics of jacked pile.
Highlights The paper innovatively simulated the overburden of soil by using the air bag loading method, and at the same time used the large-scale model pile to simulate the pile jacking process in laboratory. A full-section earth pressure sensor was installed at the end of the model pile to obtain the accurate end resistance during pile jacking. Through section pile jacking, the pile jacking force, pile end resistance and pile lateral resistance of each section of pile jacking process are analyzed. Finally, the whole pile jacking process is realized by coupling and superposition of the three sections of pile jacking process. Based on the section pile jacking and pile lateral friction degradation theory, the degradation coefficient of pile lateral friction is deduced, and the force mechanism and influencing factors of pile lateral friction degradation are analyzed.
Research of jacked pile penetration test based on airbag loading
Zhang, Yamei (author) / Wang, Yonghong (author) / Liu, Xueying (author) / Sang, Songkui (author)
2022-06-16
Article (Journal)
Electronic Resource
English
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