西安建筑科技大学学报(自然科学版)

含水量对珠三角软土时效变形特性影响试验分析与模型研究

童华炜¹, 方晓填¹, 刘柱辉²,袁杰¹

(1.广州大学土木工程学院,广东广州 510006; 2.中交(广州)铁道设计研究院有限公司,广东广州 510290)

Experimental analysis and model study on the influence of water content on the aging deformation characteristics of soft soil in Pearl River delta

TONG Huawei¹, FANG Xiaotian¹, LIU Zhuhui², YUAN Jie¹

(1.School of Civil Engineering, Guangzhou University, Guangzhou 510006, China;2.CCCC(Guangzhou)Railway Consultants CO.,LTD, Guangzhou 510290, China)

Keywords：The Pearl River Delta; soft soil; time-dependent deformation; direct shear creep; water content; modelanalysis

DOI: 10.15986j.1006-7930.2019.02.003

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参考文献

软土时效变形特性对于建筑物的稳定性有着重要影响.通过室内直剪蠕变试验,在相同试验条件下完成了5组不同含水量及不同应力水平试样时效变形特性的测试,获得了试样含水量与时效变形特性的关系,研究含水量对珠三角软土时效变形特性的影响.试验结果表明,该地区软土变形时效特性明显,含水量是影响软土时效变形特性的重要因素之一.采用五元件Kelvin模型和西原正夫模型对试验曲线进行拟合分析,两个模型在不同含水量、不同应力水平组合下的拟合与试验结果都具有良好的一致性,且两个模型拟合效果具有互补性.引入邓肯-张模型非线性E-v模型,使西原正夫模型在低含水量低荷载时的拟合效果显著提高.

The time-dependent deformation characteristic of soft soil has an important influence on the stability of the building. Through direct shear creep test in laboratory, 5 groups of different water content and different stress levels of the sample time-dependent deformation characteristics were tested under the same conditions, the relationship between water content of the specimen and the time-dependent deformation characteristics was obtained, and the effect of water content on the time-depent deformation characteristics of the soft soil in the Pearl River Delta was studied. Results show that the obvious time-characteristic of the soft soil and the water content is one of the important factors affecting the time-dependent deformation characteristic of soft soil. The five component Kelvin model and Nishihara Masao model were used to analyze the experimental curves. The fitting and experimental results of the two models under different water content and different stress levels had good consistency, and the fitting effects of the two models were complementary. The nonlinear E-v model of Duncan-Chang model is introduced to improve the fitting effect of Nishihara Masao model at low water content and low load.

引言
1 萝岗软土流变试验
2 软土流变模型
3 理论模型拟合分析与评价
4 引入邓肯—张非线性模型
5 结论

图1 改进后的直剪蠕变仪<br/>Fig.1 Improved direct shear creep apparatus

图1 改进后的直剪蠕变仪
Fig.1 Improved direct shear creep apparatus

表1 土样主要物理力学性<br/>Tab.1 Physico-mechanical characteristics of soils

表1 土样主要物理力学性
Tab.1 Physico-mechanical characteristics of soils

表2 不同含水量试样的直剪蠕变试验方案<br/>Tab.2 Direct shear creep test scheme for samples with different water content

表2 不同含水量试样的直剪蠕变试验方案
Tab.2 Direct shear creep test scheme for samples with different water content

表3 不同结合水含量试样的平均粘滞系数<br/>Tab.3 Average viscosity coefficient of samples with different water content

表3 不同结合水含量试样的平均粘滞系数
Tab.3 Average viscosity coefficient of samples with different water content

图3 第一级荷载下不同含水量试样的剪应变-时间关系曲线<br/>Fig.3 Shear strain time relation curve of samples with different water content under first stage load

图3 第一级荷载下不同含水量试样的剪应变-时间关系曲线
Fig.3 Shear strain time relation curve of samples with different water content under first stage load

图4 第二级荷载下不同含水量试样的剪应变-时间关系曲线<br/>Fig.4 Shear strain time relation curve of samples with different water content under second stage load

图4 第二级荷载下不同含水量试样的剪应变-时间关系曲线
Fig.4 Shear strain time relation curve of samples with different water content under second stage load

图5 第三级荷载下不同含水量试样的剪应变—时间关系曲线<br/>Fig.5 Shear strain time relation curve of samples with different water content under third stage load

图5 第三级荷载下不同含水量试样的剪应变—时间关系曲线
Fig.5 Shear strain time relation curve of samples with different water content under third stage load

图6 第四级荷载下不同含水量试样的剪应变—时间关系曲线<br/>Fig.6 Shear strain time relation curve of samples with different water content under forth stage load

图6 第四级荷载下不同含水量试样的剪应变—时间关系曲线
Fig.6 Shear strain time relation curve of samples with different water content under forth stage load

图7 试样ZJ1的剪应力—剪应变等时曲线<br/>Fig.7 Shear stress shear strain isochronous curve of sample ZJ1

图7 试样ZJ1的剪应力—剪应变等时曲线
Fig.7 Shear stress shear strain isochronous curve of sample ZJ1

图8 试样ZJ2的剪应力—剪应变等时曲线<br/>Fig.8 Shear stress shear strain isochronous curve of sample ZJ2

图8 试样ZJ2的剪应力—剪应变等时曲线
Fig.8 Shear stress shear strain isochronous curve of sample ZJ2

图9 试样ZJ3的剪应力—剪应变等时曲线<br/>Fig.9 Shear stress shear strain isochronous curve of sample ZJ3

图9 试样ZJ3的剪应力—剪应变等时曲线
Fig.9 Shear stress shear strain isochronous curve of sample ZJ3

图10 试样ZJ4的剪应力—剪应变等时曲线<br/>Fig.10 Shear stress shear strain isochronous curve of sample ZJ4

图10 试样ZJ4的剪应力—剪应变等时曲线
Fig.10 Shear stress shear strain isochronous curve of sample ZJ4

图11 试样ZJ5的剪应力—剪应变等时曲线<br/>Fig.11 Shear stress shear strain isochronous curve of sample ZJ5

图11 试样ZJ5的剪应力—剪应变等时曲线
Fig.11 Shear stress shear strain isochronous curve of sample ZJ5

图12 平均粘滞系数与含水量的关系曲线<br/>Fig.12 The relation curve of average viscosity coefficient and water content

图12 平均粘滞系数与含水量的关系曲线
Fig.12 The relation curve of average viscosity coefficient and water content

图13 广义Kelvin模型<br/>Fig.13 Generalized Kelvin model

图13 广义Kelvin模型
Fig.13 Generalized Kelvin model

图14 西原正夫模型<br/>Fig.14 Nishihara Masao model

图14 西原正夫模型
Fig.14 Nishihara Masao model

表4 各组含水量试样的直剪蠕变试验方案<br/>Tab.4 Direct shear creep test scheme for samples with different water content

表4 各组含水量试样的直剪蠕变试验方案
Tab.4 Direct shear creep test scheme for samples with different water content

表5 五元件广义Kelvin模型中各组合对应的模型参数表<br/>Tab.5 Parameters table of each combination in the five element generalized Kelvin model

表5 五元件广义Kelvin模型中各组合对应的模型参数表
Tab.5 Parameters table of each combination in the five element generalized Kelvin model

表6 西原正夫模型中各组合对应的模型参数表<br/>Tab.6 Parameters table of each combination in the Nishihara Masao model

表6 西原正夫模型中各组合对应的模型参数表
Tab.6 Parameters table of each combination in the Nishihara Masao model

图15 第一级荷载、各含水量不同模型拟合对比<br/>Fig.15 The first load, each water content of different models fitting comparison

图15 第一级荷载、各含水量不同模型拟合对比
Fig.15 The first load, each water content of different models fitting comparison

图16 第一级荷载、各含水量不同模型拟合对比<br/>Fig.16 The first load, each water content of different models fitting comparison

图16 第一级荷载、各含水量不同模型拟合对比
Fig.16 The first load, each water content of different models fitting comparison

图17 第二级荷载、各含水量不同模型拟合对比<br/>Fig.17 The second load, each water content of different models fitting comparison

图17 第二级荷载、各含水量不同模型拟合对比
Fig.17 The second load, each water content of different models fitting comparison

图18 第二级荷载、各含水量不同模型拟合对比<br/>Fig.18 The second load, each water content of different models fitting comparison

图18 第二级荷载、各含水量不同模型拟合对比
Fig.18 The second load, each water content of different models fitting comparison

图19 第三级荷载、各含水量不同模型拟合对比<br/>Fig.19 The third load, each water content of different models fitting comparison

图19 第三级荷载、各含水量不同模型拟合对比
Fig.19 The third load, each water content of different models fitting comparison

图20 第三级荷载、各含水量不同模型拟合对比<br/>Fig.20 The third load, each water content of different models fitting comparison

图20 第三级荷载、各含水量不同模型拟合对比
Fig.20 The third load, each water content of different models fitting comparison

图21 第四级荷载、各含水量不同模型拟合对比<br/>Fig.21 The forth load, each water content of different models fitting comparison

图21 第四级荷载、各含水量不同模型拟合对比
Fig.21 The forth load, each water content of different models fitting comparison

图22 第四级荷载、各含水量不同模型拟合对比<br/>Fig.22 The forth load, each water content of different models fitting comparison

图22 第四级荷载、各含水量不同模型拟合对比
Fig.22 The forth load, each water content of different models fitting comparison

图23 线性与非线性西原正夫模型拟合对比图<br/>Fig.23 Contrast diagram of linear and nonlinear Nishihara Masao model

图23 线性与非线性西原正夫模型拟合对比图
Fig.23 Contrast diagram of linear and nonlinear Nishihara Masao model

表7 非线性西原正夫模型参数表<br/>Tab.7 Parameters table of each combination in the nonlinear Nishihara Masao model

表7 非线性西原正夫模型参数表
Tab.7 Parameters table of each combination in the nonlinear Nishihara Masao model

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期刊信息

西安建筑科技大学学报(自然科学版)
（1957年创刊双月刊）

主管单位：陕西省教育厅

主办单位：西安建筑科技大学

主　　编：刘加平（院士）

副主编：史庆轩（常务）张引科张小龙

国内刊号：CN61-1295/TU

I S S N：1006-7930

地　　址：西安市雁塔路中段13号

国内发行：西安建筑科技大学学报编辑部

国外发行：中国出版对外贸易总公司

编辑出版：西安建筑科技大学学报编辑部

备注

引言

1 萝岗软土流变试验

2 软土流变模型

3 理论模型拟合分析与评价

4 引入邓肯—张非线性模型

5 结论

期刊信息