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Scale model test study on negative skin friction of piles considering the collapsibility of loess |
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| Authors: | Zhao Zhuangfu Ye Shuaihua Zhu Yanpeng Tao Hui Chen Changliu |
| Affiliation: | 1.Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, 730050, China ;2.Western Center of Disaster Mitigation in Civil Engineering, Ministry of Education, Lanzhou University of Technology, Lanzhou, 730050, China ;3.Gansu Vocational College of Architecture, Lanzhou, 730050, Gansu, China ;4.Gansu CSCEC Municipal Engineering Investigation and Design, Institute Co.Ltd., Lanzhou, 730050, Gansu, China ; |
| Abstract: | In collapsible loess area, the negative skin friction of pile foundation will cause many engineering problems such as failure of pile strength and reduction of bearing capacity of pile foundation, which will bring great harm to engineering construction. In order to study the change and distribution law of negative friction of pile foundation in collapsible loess area, the scale model test of negative friction of pile considering loess collapsibility was designed and completed. Through finite element numerical simulation, the test results are verified, and the distribution law of negative friction of pile and the number and position of neutral points are obtained. The test results show that under the condition of immersion, the loess has layered settlement, and there are both negative friction and positive friction on the pile surface, and there are two neutral points. Negative friction drags the pile downward, which makes the axial force of the pile increase obviously. The numerical simulation results verify the feasibility and validity of the test results. The research results of this paper have certain guiding significance for pile foundation design in collapsible loess area. |
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