变围压循环荷载作用下超固结软黏土变形特性试验研究

黄珏皓; 王应武; 陈健; 刘府生; 侯丰; 付晓东; 马超

doi:10.11779/CJGE2021S2058

变围压循环荷载作用下超固结软黏土变形特性试验研究 English Version

黄珏皓^{1, 2, 3, 4,},
王应武⁵,
陈健^{1, 2, 3, 4, 6, 7, ,},
刘府生⁸,
侯丰⁸,
付晓东^{1, 2},
马超¹

1.
中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北　武汉　430071
2.
中国科学院大学,北京　100049
3.
湖北省环境岩土工程重点实验室,湖北　武汉　430071
4.
岩土力学与工程国家重点实验室宁波工程学院工程软土实验中心,浙江　宁波　315211
5.
云南省水利水电勘测设计研究院,云南　昆明　650021
6.
中国-巴基斯坦地球科学研究中心,伊斯兰堡,巴基斯坦
7.
水下隧道技术国家地方联合工程研究中心,湖北　武汉　430063
8.
中铁第四勘察设计院集团有限公司,湖北　武汉　430063

基金项目:

国家自然科学基金青年项目 51909259

国家自然科学基金面上项目 52079135

中国科学院青年创新促进会 2021325

详细信息

作者简介:
黄珏皓(1991— ),男,助理研究员,主要从事软土动力特性及本构模型方面的研究。E-mail：jhhuang@whrsm.ac.cn

通讯作者:
陈健, E-mail: jchen@whrsm.ac.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2021-08-14
- 网络出版日期: 2022-12-05
- 刊出日期: 2021-10-31

Experimental study on deformation behaviors of overconsolidated clay under cyclic confining pressure

HUANG Jue-hao^{1, 2, 3, 4,},
WANG Ying-wu⁵,
CHEN Jian^{1, 2, 3, 4, 6, 7, ,},
LIU Fu-sheng⁸,
HOU Feng⁸,
FU Xiao-dong^{1, 2},
MA Chao¹

1.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Hubei Key Laboratory of Geo-Environmental Engineering, Wuhan 430071, China
4.
The Soft Soil Research Center in Ningbo University of Technology, State Key Laboratory of Geomechanics and Geotechnical Engineering, Ningbo 315211, China
5.
Yunnan Institute of Water & Hydropower Engineering Investigation, Design and Research, Kunming 650021, China
6.
China-Pakistan Joint Research Center on Earth Sciences, Islamabad, Pakistan
7.
National-Local Joint Engineering Research Center of Underwater Tunneling Technology, Wuhan 430063, China
8.
China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan, Hubei 430063, China

摘要

摘要: 通常采用单一轴向循环荷载模拟交通荷载,然而,真实的交通荷载引起的应力场包含循环变化的轴向偏应力和围压。除此之外,部分下卧软黏土是超固结土,并非正常固结土,且针对交通荷载作用下超固结软黏土变形特性的研究较少。因此,通过对超固结软黏土开展一系列变围压不排水循环三轴试验,对超固结软黏土在变围压循环荷载作用下的累积轴向应变变化规律进行了研究,分析了超固结比和循环围压对累积轴向应变的影响。研究结果表明：变围压循环荷载作用下,不同循环围压幅值和超固结比条件对应的累积轴向应变与振动次数关系曲线相似。超固结比和循环围压对累积轴向应变的影响显著,循环围压和超固结比对土体累积轴向应变的发展均存在较为明显的抑制作用,具体为与恒围压循环荷载作用下土体累积轴向应变相比,当应力路径斜率η为1.00,1.50时,其对应的累积轴向应变分别减少了7.7%,15.8%；当超固结比OCR从1增至8时,超固结土和正常固结土对应累积轴向应变比从0.122减少至0.040。上述研究成果可加深对超固结土在交通荷载作用下变形规律的认识,从而为交通荷载作用下超固结土长期变形预测方法的建立奠定试验基础。
- 软黏土 /
- 循环围压 /
- 超固结比 /
- 累积轴向应变
Abstract: Traffic loading is usually simulated by single cyclic deviator stress. However, the vertical normal stress and horizontal stress acting on the soil elements are all varied cyclically under traffic loading. Nevertheless, part of the subgrade soil is overconsolidated, rather than normally-consolidated. There are few researches on the development of the accumulated axial strain of the overconsolidated soft clay under traffic loading. Recognizing this, a series of cyclic triaxial tests with cyclic confining pressures are conducted on overconsolidated clay under undrained conditions, and the effects of the cyclic confining pressures and overconsolidated ratios on the development of accumulated axial strain are investigated. It is observed that the relationship between the accumulated axial strain and the number of cycles are similar under different test conditions, in which the accumulated axial strain increases rapidly at the beginning of tests and increases with a decreasing rate to achieve a stable value. Besides that, the overconsolidated ratios and cyclic confining pressures have a significant effect on the development of the accumulated axial strain: both the cyclic confining pressure and the overconsolidation ratio inhibit the development of the accumulated axial strain. By comparing with the accumulated axial strain obtained under cyclic triaxial tests with the constant confining pressure, the accumulated axial strain decreases by 7.7% and 15.8% when the slopes of stress path are 1.0 and 1.5, respectively. Additionally, the accumulated axial strain ratio of the overconsolidated soft clay and normal consolidated clay decreases from 0.122 to 0.040 as the overconsolidated ratios increases from 1 to 8. The above research results may deepen the understanding of the deformation evolution of the overconsolidated soil under traffic loading, and provide experimental basis for the establishment of prediction formula for the deformation of the overconsolidated soil under traffic loading.
- soft clay /
- cyclic confining pressure /
- overconsolidated ratio /
- accumulated axial strain

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图 1 变围压动三轴应力路径

Figure 1. Stress paths in cyclic triaxial tests

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图 2 不同循环围压下累积轴向应变随振次变化曲线

Figure 2. Variation of accumulated axial strain with number of cycles under different cyclic confining pressures

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图 3 不同超固结土累积轴向应变随振次变化曲线

Figure 3. Relationship between accumulated axial strain and number of cycles under different overconsolidated ratios

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图 4 恒围压和变围压条件下累积轴向应变关系曲线

Figure 4. Relationship between accumulated axial strain under VCP tests and that under CCP tests

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图 5 超固结土和正常固结土累积轴向应变关系曲线

Figure 5. Relationship between accumulated axial strain of overconsolidated soil and that of normal consolidated soil

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参考文献(6)

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[2]	MONISMITH C L, OGAWA N, FREEME C R. Permanent deformation characteristics of subgrade soils due to repeated loading[J]. Transportation Research Record, 1975(537): 1-17.
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[4]	SUN L, GU C, WANG P. Effects of cyclic confining pressure on the deformation characteristics of natural soft clay[J]. Soil Dynamics and Earthquake Engineering, 2015, 78: 99-109. doi: 10.1016/j.soildyn.2015.07.010
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