| 静压桩承载力时间效应的研究进展 |
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| 引用本文： | 王永洪,黄永峰,张明义,李长河,苏雷,仉文岗,林沛元,崔纪飞,焉振.静压桩承载力时间效应的研究进展[J].吉林大学学报(地球科学版),2021,51(5):1490-1505. |
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| 作者姓名： | 王永洪 黄永峰 张明义 李长河 苏雷 仉文岗 林沛元 崔纪飞 焉振 |
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| 作者单位： | 1. 青岛理工大学土木工程学院, 山东 青岛 266033;2. 山东省高等学校蓝色经济区工程建设与安全协同创新中心, 山东 青岛 266033;3. 青岛理工大学机械与汽车工程学院, 山东 青岛 266520;4. 重庆大学土木工程学院, 重庆 400045;5. 中山大学土木工程学院, 广州 510275;6. 上海理工大学环境与建筑学院, 上海 200093;7. 交通运输部天津水运工程科学研究所, 天津 300000 |
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| 基金项目： | 国家自然科学基金项目（41772318，51778312，51809146） |
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| 摘 要： | 由于静压桩沉桩后桩周土重塑，静压桩承载力表现出随着休止期的延长而增长的特性。本文从静压桩沉桩后桩周土体内孔隙水消散固结的角度出发，对静压桩承载力时间效应的理论和试验分别进行归纳，结合孔隙水消散路径及固结模型，对桩周土体初始超静孔隙水压力大小及其分布特征进行总结，分析承载力各种测试方法的优缺点，对静压桩承载力的时效性进行深化研究，并探讨了不同地质条件、不同桩的类型对休止期内静压桩承载力的影响，进一步对基于实测数据得出的经验公式进行总结。讨论了基于不同本构关系模型的应力场及位移场解答和沉桩后孔隙水压力消散解答，在此基础上总结了桩基极限承载力理论公式；探讨了黏性土、砂土条件下，考虑超固结比、不排水抗剪强度和塑性指数比对桩基极限承载力系数A的影响，在此基础上归纳了桩基极限承载力经验公式。建议在经验公式基础上设置多重参数，以提升经验公式的精确度，并完善对不同桩、土类型的参数解答；利用BP神经网络，导入静压桩承载力相关参数，以得到针对不同地质条件、桩型、休止期的承载力最优解。
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| 关 键 词： | 静压桩 承载力 时间效应 经验公式 |
| 收稿时间： | 2020-07-17 |
Research Progress on Time Effect of Static Pressure Pile Bearing Capacity |
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| Wang Yonghong,Huang Yongfeng,Zhang Mingyi,Li Changhe,Su Lei,Zhang Wengang,Lin Peiyuan,Cui Jifei,Yan Zhen.Research Progress on Time Effect of Static Pressure Pile Bearing Capacity[J].Journal of Jilin Unviersity:Earth Science Edition,2021,51(5):1490-1505. |
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| Authors: | Wang Yonghong Huang Yongfeng Zhang Mingyi Li Changhe Su Lei Zhang Wengang Lin Peiyuan Cui Jifei Yan Zhen |
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| Abstract: | Due to the remodeling of the soil around the pile after the settlement of the static pressure pile, the bearing capacity of the static pressure pile shows the characteristic of increasing with the growth of the resting period. From the perspective of the dissipation and consolidation of pore water in the soil around the pile after the pile sinking, in this paper, the authors summarize the theoretical and experimental studies on the time effect of the bearing capacity of the static pressure pile. For the existing shortcomings, it is recommended to fully consider the initial excess pore water pressure of the soil around the pile and its distribution characteristics, to conduct in-depth research on the time effect of the bearing capacity of the static pressure pile combined with the pore water dissipation path and consolidation model, and to explore through experiments the influence of different geology and pile types on the bearing capacity of static pressure piles during the rest period so as to further improve the empirical formula based on the measured data. This research helps to predict the safety of buildings, thereby optimizing the design of the static pressure pile, and bringing good economic benefits to the construction party and the designer. The stress field and displacement field solutions based on different constitutive relationship models and the solution of pore water pressure dissipation after pile sinking are summarized, the theoretical formula of ultimate bearing capacity of pile foundation through effective stress principle is established, and under the condition of cohesive soil and sand with considering the influence of over-consolidation ratio and undrained shear strength and plasticity index ratio on coefficient A, the empirical formula for ultimate bearing capacity of pile foundation is improved. It is recommended that multiple parameters should be set on the basis of the empirical formula to improve the accuracy of the empirical formula and the parameter solutions for different piles and soil types, and by using the BP neural network and importing the relevant parameters of the static pressure pile bearing capacity to obtain the optimal solution for the bearing capacity of different geological conditions, pile types, and resting periods. |
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| Keywords: | static pressure pile bearing capacity time-effect empirical equation |
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