[1]曾玲玲,陈福全,郭立群.天然沉积结构性软土的超载预压变形性状试验[J].华侨大学学报(自然科学版),2012,33(4):435-439.[doi:10.11830/ISSN.1000-5013.2012.04.0435]
　ZENG Ling-ling,CHEN Fu-quan,GUO Li-qun.Experimental Study on Deformation Behavior of Surcharge Preloading for Soft Natural Clays[J].Journal of Huaqiao University(Natural Science),2012,33(4):435-439.[doi:10.11830/ISSN.1000-5013.2012.04.0435]
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天然沉积结构性软土的超载预压变形性状试验()
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《华侨大学学报（自然科学版）》[ISSN:1000-5013/CN:35-1079/N]

卷:
第33卷
期数:
2012年第4期
页码:
435-439
栏目:
出版日期:
2012-07-20

文章信息/Info

Title:
Experimental Study on Deformation Behavior of Surcharge Preloading for Soft Natural Clays
文章编号:
1000-5013(2012)04-0435-05
作者:
曾玲玲1;  陈福全1;  郭立群2
1. 福州大学 土木工程学院, 福建 福州 350108;2. 华侨大学 土木工程学院, 福建 厦门 361012
Author(s):
ZENG Ling-ling1;  CHEN Fu-quan1;  GUO Li-qun2
1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China; 2. College of Civil Engineering, Huaqiao University, Xiamen 361021, China
关键词:
超载预压;  天然沉积土;  结构性;  压缩试验;  变形规律
Keywords:
surcharge preloading;  natural clays;  soil structure;  compression test;  deformation behavior
分类号:
TU411
DOI:
10.11830/ISSN.1000-5013.2012.04.0435
文献标志码:
A
摘要:
通过对天然沉积土进行常规一维压缩试验和不同有效超载比下的超载预压一维压缩试验,分析超载预压作用下天然沉积土压缩变形性状.研究结果表明:不同有效超载比预压作用下的竖向应变压缩历时曲线特征不同,预压过程主固结阶段的曲线斜率随着预压荷载的增大而增大,而次固结阶段的斜率却随着预压荷载的增大而减小;不同超载比预压作用后,超载作用延缓了次固结压缩变形发生的时间,超载比越大延缓的时间越长;延缓时间过后次固结压缩变形将重新发展,且随着对数时间的发展次固结系数呈先增大后趋于稳定的变化趋势.
Abstract:
In order to investigate the deformation behavior of natural clays under surcharge preloading, the one-dimensional compression tests were conducted with different surcharge pressure ratios, different preloading durations and unloading durations. The test results indicate that: the curve between vertical strain and consolidation time varies with surcharge pressure ratio; with the increase of surcharge pressure, the slope of the curve increases during primary consolidation; decreases during the secondary consolidation, the larger the surcharge pressure ratio causes the longer delayed duration; when the consolidation time exceeds the delayed duration, the secondary consolidation develops, and the coefficient of secondary consolidation increases initially and then stabilizes with time.

参考文献/References:

[1] Jr ALDRICH H P.Precompression for support of shallow foundations[J].Journal of the Soil Mechanics and Foundations,ASCE,1965,91(2):5-20.
[2] 李国维,盛维高,蒋华忠,等.超载卸荷后再压缩软土的次压缩特征及变形计算[J].岩土工程学报,2009,31(1):118-123.
[3] 殷宗泽,张海波,朱俊高,等.软土的次固结[J].岩土工程学报,2003,25(5):521-526.
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[9] LEROUEIL S,VAUGHAN P R.The general and congruent effects of structure in natural soils and weak rocks[J].Géotechnique,1990,40(3):467-488.
[10] 曾玲玲,洪振舜,刘松玉,等.天然沉积结构性土的次固结变形预测方法[J].岩土力学,2011,32(10):3136-3146.

备注/Memo

备注/Memo:
收稿日期: 2012-03-10
通信作者: 曾玲玲(1983-),女,讲师,博士,主要从事土的基本特性、土的本构关系及地基处理技术的研究.E-mail:linglz413@126.com.
基金项目: 国家自然科学基金资助项目(41102168)
更新日期/Last Update: 2012-07-20