天然饱和黏土地基静压桩承载力时效性研究

doi:10.16285/j.rsm.2017.09.007

›› 2017, Vol. 38 ›› Issue (9): 2515-2522.doi: 10.16285/j.rsm.2017.09.007

天然饱和黏土地基静压桩承载力时效性研究

李林^{1, 2}，李镜培^{1, 2}，孙德安³，方睿^{1, 2}

1. 同济大学岩土及地下工程教育部重点实验室，上海 200092；2. 同济大学地下建筑与工程系，上海 200092； 3. 上海大学土木工程系，上海 200072

收稿日期:2015-09-30 出版日期:2017-09-11 发布日期:2018-06-05
作者简介:李林，男，1986年生，博士研究生，主要从事桩土相互作用理论等方面的研究工作。
基金资助:
国家自然科学基金项目（No.41272288）。

Time-dependence of bearing capacity of jacked piles in natural saturated clay

LI Lin^{1, 2}, LI Jing-pei^{1, 2}, SUN De-an³, FANG Rui^{1, 2}

1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Department of Civil Engineering, Shanghai University, Shanghai 200072, China

Received:2015-09-30 Online:2017-09-11 Published:2018-06-05
Supported by:
This work was supported by the National Natural Science Foundation of China (41272288).

摘要/Abstract

摘要： 分别以柱孔和球孔扩张模拟桩身和桩端的贯入过程，采用可以考虑天然饱和黏土应力历史和应力各向异性的圆孔扩张解答描述桩周土体的应力状态，推导了饱和黏土地基中静压桩终压力的理论解，进而基于桩周孔压径向消散的固结解答，在考虑桩周土再固结过程中松弛效应的基础上，推导了沉桩结束后静压桩时变承载力的解答，建立了静压桩承载力时效性系数的理论表达式。通过离心模型和现场试验对所提的理论解答的正确性进行了验证，研究了天然饱和黏土中静压桩承载力的时效性。结果表明：沉桩结束后较短时间内静压桩承载力时效性是超孔压消散和土体触变恢复共同作用的结果，一定间歇期后超孔压消散成为承载力增长的主要原因。

关键词: 终压力, 时变承载力, 离心模型试验, 时效性系数

Abstract: Considering the stress history and initial stress anisotropy of natural saturated clay under K0-consolidated condition, a theoretical solution to the jacking force of pile was derived by modeling the pile shaft penetration process as the spherical and cylindrical cavity expansions, respectively. Then, based on the radial excess pore water dissipation after the pile installation, an analytical solution to the time-dependent bearing capacity of the jacked pile was derived by considering the relaxation effect of the soil around the pile during reconsolidation process. And the theoretical expression for the timeliness coefficient of jacked pile bearing capacity in K0-consolidated natural saturated clay was established. The validity of the present solution was verified by the centrifuge model test and field test respectively, and the time-dependent bearing capacity were discussed in detail. The results show that, the time-dependent bearing capacity within a short time after pile installation can be attributed to the combination of the excess pore water pressure dissipation and the thixotropy recovery of the surrounding soils. After a certain rest time, the dissipation of the excess pore water pressure is the main reason for the increase of the bearing capacity.

Key words: terminative jacking force, time-dependent bearing capacity, centrifuge test, timeliness coefficient ratio

中图分类号:

TU 411

李林，李镜培，孙德安，方睿, . 天然饱和黏土地基静压桩承载力时效性研究[J]. , 2017, 38(9): 2515-2522.

LI Lin, LI Jing-pei, SUN De-an, FANG Rui, . Time-dependence of bearing capacity of jacked piles in natural saturated clay[J]. , 2017, 38(9): 2515-2522.

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天然饱和黏土地基静压桩承载力时效性研究

Time-dependence of bearing capacity of jacked piles in natural saturated clay

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