软土流变的物质基础及流变机制探索

›› 2009, Vol. 30 ›› Issue (7): 1915-1919.

软土流变的物质基础及流变机制探索

谷任国^{1, 2}，房营光^{1, 2}

1.华南理工大学土木与交通学院，广州 510641；2.亚热带建筑科学国家重点实验室，广州 510641

收稿日期:2008-08-29 出版日期:2009-07-10 发布日期:2011-03-10
作者简介:谷任国，男，1979年生，工学博士，助理研究员，主要从事岩土及地下结构方面的研究。
基金资助:
中国博士后科学基金资助项目（No. 20080430815）；亚热带建筑科学国家重点实验室资助项目（No. 2008ZA11）。

Exploration of substance bases and mechanism of soft soil rheology

GU Ren-guo ^{1, 2}, FANG Ying-guang ^{1, 2}

1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; 2. State Key Laboratory of Subtropical Architecture Science, Guangzhou 510641, China

Received:2008-08-29 Online:2009-07-10 Published:2011-03-10

摘要/Abstract

摘要：

采用改进的直剪蠕变仪，研究结合水对软土流变性质的影响。在相同试验条件下分别完成了含高岭土、膨润土不同重量百分比2组烘干试样和1组砂土的流变性质测试。测试结果与近期已取得的试验成果对比分析表明，结合水是产生土样流变性质的重要因素；烘干试样的黏滞系数均比与其矿物成分相同的湿土试样的黏滞系数大，砂土试样的黏滞系数比湿黏土的黏滞系数大，即烘干土样与砂土土样流变变形阻力相对湿黏土的大，流变现象相对不明显。在试验基础上，探索了控制软土流变特性的物质基础，提出了“流变物质”概念，“流变物质”与软土的流变性质互相对应，是软土产生流变的主要物质基础，并给出了与其力学性质相适应的流变机制的软土流变特性的物理描述。

关键词: 软土, 流变试验, 流变物质, 流变机制

Abstract:

By using an improved direct shear creep apparatus, exploration of effects of adsorbed water on rheological characteristics of soft soil is performed; and rheological characteristics of two groups of dried clay samples with different contents of kaoline and bentonite, respectively, and one sand sample are tested under the same test conditions. The compasions between current test results and data obtained from recently creep tests show that the adsorbed water is an important factor on rheological behavior of soil; the viscosity coefficient of dried clay is higher than that of wet clay, which compositions is the same as the dried clay; and the viscosity coefficient of sand is also higher than that of the wet clays; that is, the rheological strain resistance of the dried clays and sand is relatively greater than that of the wet clays; and the rheological phenomena of the formers are less obvious than that of the latters. Based on the data obtained from laboratory expriments, the substance bases of rheological characteristics of soft soil are explored. And the definition of “rheology substances” is proposed. The analyses of test results indicate “rheology substances” are responsible for rheological characteristics of soft soil and are the primary substance bases of soft soil rheology. The physical description of rheological mechanism of soft soil is presented, which is corresponding to the mechanical properties of “rheology substances”.

Key words: soft soil, rheology tests, rheology substance, rheological mechanism

中图分类号:

TU 411.99

谷任国，房营光. 软土流变的物质基础及流变机制探索[J]. , 2009, 30(7): 1915-1919.

GU Ren-guo, FANG Ying-guang. Exploration of substance bases and mechanism of soft soil rheology[J]. , 2009, 30(7): 1915-1919.

参考文献

相关文章 15

[1]	王国辉, 陈文化, 聂庆科, 陈军红, 范晖红, 张川, . 深厚淤泥质土中基坑开挖对基桩影响的离心模型试验研究[J]. 岩土力学, 2020, 41(2): 399-407.
[2]	贺志军, 雷皓程, 夏张琦, 赵炼恒. 多层软土地基中单桩沉降与内力位移分析[J]. 岩土力学, 2020, 41(2): 655-666.
[3]	张治国, 李胜楠, 张成平, 王志伟, . 考虑地下水位升降影响的盾构施工诱发地层变形和衬砌响应分析[J]. 岩土力学, 2019, 40(S1): 281-296.
[4]	叶观宝, 郑文强, 张振, . 大面积填土场地中摩擦型桩负摩阻力分布特性研究[J]. 岩土力学, 2019, 40(S1): 440-448.
[5]	雷华阳, 胡垚, 雷尚华, 祁子洋, 许英刚, . 增压式真空预压加固吹填超软土微观结构特征分析[J]. 岩土力学, 2019, 40(S1): 32-40.
[6]	龚文惠, 赵旭东, 邱金伟, 李逸, 杨晗. 饱和软土大应变自重固结非线性分析[J]. 岩土力学, 2019, 40(6): 2099-2107.
[7]	张奎, 赵成刚, 李伟华. 海底软土层对海洋地基场地动力响应的影响[J]. 岩土力学, 2019, 40(6): 2456-2468.
[8]	蒲诃夫, 宋丁豹, 郑俊杰, 周洋, 闫婧, 李展毅. 饱和软土大变形非线性自重固结模型[J]. 岩土力学, 2019, 40(5): 1683-1692.
[9]	杨爱武, 潘亚轩, 曹宇, 尚英杰, 吴可龙, . 吹填软土低位真空预压室内试验及其数值模拟[J]. 岩土力学, 2019, 40(2): 539-548.
[10]	周建, 蔡露, 罗凌晖, 应宏伟, . 各向异性软土基坑抗隆起稳定极限平衡分析[J]. 岩土力学, 2019, 40(12): 4848-4856.
[11]	杨鹏, 蒲诃夫, 宋丁豹. 竖井地基的大应变固结分析[J]. 岩土力学, 2019, 40(10): 4049-4056.
[12]	吴建涛, 叶霄, 李国维, 蒋超, 曹雪山, . 高路堤下PHC桩加固软土地基的承载及变形特性[J]. 岩土力学, 2018, 39(S2): 351-358.
[13]	郭红仙, 周鼎. 软土中基坑土钉支护稳定性问题探讨[J]. 岩土力学, 2018, 39(S2): 398-404.
[14]	刘泉声, 罗慈友, 陈自由, 刘鹤, 桑昊旻, 万文恺, . 现场岩体三轴流变试验设备研制[J]. 岩土力学, 2018, 39(S2): 473-479.
[15]	汪益敏，闫岑，于恒，李奇. 静载作用下土工格栅加筋拓宽路堤土中应力特征试验研究[J]. , 2018, 39(S1): 311-317.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed