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Research on Soil Plug and Its Contribution to Axial Capacity of Large-diameter Tubular Pile

Author: LiJianQiang
Tutor: WenXiaoGui
School: Zhejiang University
Course: Geotechnical Engineering
Keywords: Large-diameter thin-walled tubular pile Soil core plugging Influencing factors Capacity Calculation
CLC: TU473.11
Type: Master's thesis
Year: 2010
Downloads: 42
Quote: 0
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Abstract


Large-diameter thin-walled tubular pile soil core contribution to the bearing capacity of the pile vertical , which is the pile is different from the other pile is an important feature . Opening pile bearing capacity study of the soil core knowledge and research is still very superficial, the calculated results with the measured difference carry out soil core traits and very important study on vertical bearing capacity contribution , which is reasonable tubular pile design theoretical basis. Start from the soil core occlusion defined research the soil core occlusion impact factors to calculate the new method proposed the tubular pile vertical bearing capacity of the soil core contribution of this paper research : 1 ) comparative analysis of existing domestic and foreign soil core plugging defined found that the various definitions is very confusing , considerations have focused on . The research the starting from soil cores static equilibrium conditions given soil core plugging definition applies to hydrostatic openings pile and pile diameter is not great ; 2) caused by the large diameter opening pile piling soil core inertial force can not be ignored , larger pile diameter the soil core plugging piling height of the larger , and the height is closely related to the piling acceleration . Concrete cylindrical piles with large diameter steel pipe piles , piling soil core plugging up the possibility of much larger ; 3 ) Soil core static load and occlusive impact factors studies have shown that the larger the pile diameter soil core less easy occlusion ; same pile diameter , wall thickness of the larger , more easily occlusion soil core ; nature and distribution of the soil very large impact on soil core plugging soil strength is lower , the less likely occlusion ; greater the depth of penetration , soil properties affect the more large ; 4 ) existing opening pile calculation can not be accurately estimated the opening piling around the pile lateral friction change , and soil core plugging caused by the tip resistance increased , so the results are not ideal . In comparison , ICP (Imperialco1lege pile) method to facilitate the calculation results are accurate ; 5) Based on ICP calculation idea , put forward a new method of the tubular pile vertical bearing capacity of the soil core contribution calculated and engineering example . The method takes into account the characteristics of the soil of the southeast coast of China , the ICP method is simple , practical , better forecasts .

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile > The ultimate bearing capacity
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