[1]朱小军,李文帅,龚维明,等.砂土中筒型基础静压下沉试验及受力特性[J].东南大学学报(自然科学版),2018,48(3):512-518.[doi:10.3969/j.issn.1001-0505.2018.03.020]
 Zhu Xiaojun,Li Wenshuai,Gong Weiming,et al.Static pressure penetration test and mechanical characteristics of bucket foundation in sand[J].Journal of Southeast University (Natural Science Edition),2018,48(3):512-518.[doi:10.3969/j.issn.1001-0505.2018.03.020]
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砂土中筒型基础静压下沉试验及受力特性()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
48
期数:
2018年第3期
页码:
512-518
栏目:
土木工程
出版日期:
2018-05-20

文章信息/Info

Title:
Static pressure penetration test and mechanical characteristics of bucket foundation in sand
作者:
朱小军12李文帅2龚维明1费康2
1东南大学土木工程学院, 南京 210096; 2扬州大学建筑科学与工程学院, 扬州 225127
Author(s):
Zhu Xiaojun12 Li Wenshuai2 Gong Weiming1 Fei Kang2
1School of Civil Engineering, Southeast University, Nanjing 210096, China
2College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China
关键词:
筒型基础 静压下沉 土塞效应 贯入力 模型试验
Keywords:
bucket foundation static pressure penetration soil plugging effect tip resistance model test
分类号:
TU443
DOI:
10.3969/j.issn.1001-0505.2018.03.020
摘要:
为了探究筒型基础静压下沉过程中筒-土之间的阻力特性,开展了3种不同口径的筒型基础在砂土中静压下的沉模型试验,测量了下沉过程中筒壁内外及筒端土压力与总的下沉阻力.基于土拱效应理论推导出筒体内壁土压力计算公式,建立了考虑筒内土塞作用的贯入力预测计算方法.研究表明, 在沉贯深度达约1倍口径时开始出现土塞效应,在沉贯过程中,筒内土塞闭塞程度随口径的增大而降低,沉贯结束时各工况土塞增长率分别为65%,70%,80%.筒体内壁土压力呈双折线形式,计算值与实测值吻合较好;外壁土压力成线性增大,可用折减的被动土压力进行计算;土拱阻力占贯入总阻力比例高达70%,考虑筒内土塞作用的贯入力计算方法能够对此进行较好地预测.
Abstract:
To reveal the resistance characteristic between soil and bucket during the static pressure penetration process. Three different caliber bucket foundations were penetrated in sand by static pressure. Earth pressures inside and outside the bucket wall, as well as the tip resistance and total penetration resistance were measured in the experiments. Based on the soil arching effect theory, a calculation formula of the internal earth pressure was derived. And the predictor calculation method for the bucket tip resistance was established by considering the soil plug resistance in bucket. Study results show that the soil plugging effect appears when the penetration depth reaches about 1 times in the diameter, the extent of soil plug alleviated as the diameter of bucket increases in the process of the penetration, and the incremental filling ratios of each bucket are 65%, 70% and 80%, at the end of penetration. The inner pressure of the bucket is in the form of the double broken line, and the calculated values are in well agreement with the measured ones. When the outer pressure increases linearly, it can be calculated by the method for reducing the passive soil pressure. The ratio of soil arching resistance to total penetration resistance during penetration is up to 70%, thus it can be predicted by the calculation method for the bucket tip resistance.

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备注/Memo

备注/Memo:
收稿日期: 2017-11-05.
作者简介: 朱小军(1987—),男,博士,讲师,zhuxiaojun@yzu.edu.cn.
基金项目: 国家自然科学基金面上资助项目(51478109, 51678145)、江苏省自然科学基金青年基金资助项目(BK20170509).
引用本文: 朱小军,李文帅,龚维明,等.砂土中筒型基础静压下沉试验及受力特性[J].东南大学学报(自然科学版),2018,48(3):512-518. DOI:10.3969/j.issn.1001-0505.2018.03.020.
更新日期/Last Update: 2018-05-20