土工布与砂土界面循环剪切动力特性

王军; 刘飞禹; 王攀; 耿雪玉

土工布与砂土界面循环剪切动力特性

王军^{1, 2, 3,},
刘飞禹⁴,
王攀⁴,
耿雪玉⁵

1.
温州大学建筑工程学院, 浙江温州 325035
2.
温州大学浙江省软弱土地基与海涂围垦工程技术重点实验室, 浙江温州 325035
3.
温州大学浙江省海涂围垦及其生态保护协同创新中心, 浙江温州 325035
4.
上海大学土木工程系, 上海 200072
5.
华威大学工程学院, 华威考文垂 CV4 7AL

基金项目:

国家自然科学基金项目 51478255

国家自然科学基金项目 51678352

国家自然科学基金项目 51622810

上海市自然科学基金项目 14ZR1416100

详细信息

作者简介:
王军(1980-), 男, 辽宁盘锦人, 温州大学教授, 工学博士, 从事地基处理与土动力学研究

中图分类号: U416.1
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出版历程
- 收稿日期: 2016-08-25
- 刊出日期: 2016-12-25

Cyclic shear dynamic properties of geotextile-sandy soil interfaces

WANG Jun^{1, 2, 3
,},
LIU Fei-yu⁴,
WANG Pan⁴,
GENG Xue-yu⁵

1.
College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, Zhejiang, China
2.
The Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province, Wenzhou University, Wenzhou 325035, Zhejiang, China
3.
Collaborative Innovation Center of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou 325035, China
4.
Department of Civil Engineering, Shanghai University, Shanghai 200072, China
5.
School of Engineering, University of Warwick, Coventry UV4 7AL, Warwick, UK

More Information

Author Bio:
WANG Jun(1980-), male, professor, PhD, +86-577-86689687, sunnystar1980@163.com

摘要

摘要: 利用室内大型循环直剪仪进行了一系列筋土界面循环剪切试验, 筋材采用土工编织布和无纺土工布, 土体采用中国ISO标准砂, 在竖向应力分别为30、60、90 kPa, 剪切位移幅值分别为1、3、5 mm, 砂土密实度分别为22%、52%、75%时, 研究了竖向应力、剪切位移幅值、砂土密实度对筋土界面循环剪切特性的影响, 分析了循环剪切过程中2种土工布与砂土界面的剪切应力峰值和剪切应力-剪切位移的变化规律。研究结果表明: 2种土工布与砂土界面均会发生循环剪切软化现象, 但软化规律不同; 竖向应力从30 kPa增大到90 kPa时, 土工编织布与砂土界面循环剪切应力峰值增大了72.9%, 无纺土工布与砂土界面循环剪切应力峰值增加了167.5%, 表明竖向应力对土工编织布与砂土界面的循环剪切特性影响明显; 剪切位移幅值分别为1、3、5 mm时, 土工编织布与砂土界面剪切应力峰值分别为25.9、27.9、29.8 kPa, 无纺土工布与砂土界面剪切应力峰值分别为21.8、23.8、22.6 kPa, 表明随着剪切位移幅值增大, 土工编织布与砂土界面剪切应力峰值随之增大, 而无纺土工布与砂土界面剪切应力峰值先增大后减小; 在3种砂土密实度下, 土工编织布与砂土界面剪切应力峰值之间的最大差值不超过2 kPa, 无纺土工布与砂土界面剪切应力峰值之间的最大差值不超过3 kPa, 表明砂土密实度对2种土工布与砂土界面的循环剪切特性影响不明显。
- 筋土界面 /
- 土工布 /
- 循环剪切 /
- 剪切位移幅值 /
- 密实度
Abstract: A series of cyclic direct shear tests of soil-reinforcement interfaces were performed by using a large-scale direct shear device.Woven geotextile and nonwoven geotextile were used as reinforcement materials.Chinese ISO standard sand was used as soil mass.When the vertical stresses are 30, 60 and 90kPa respectively, the cyclic shear displacement amplitudes are 1, 3and5 mm respectively, and the sandy soil densities are 22%, 52% and 75% respectively, theirinfluences on the cyclic shear properties of soil-reinforcement interfaces were studied, and the development laws of peak shear stresses and the relationships of shear stresses and shear displacements in the processes of cyclic shear tests on two kinds of geotextile-sandy soil interfaces were analyzed.Study result indicates that the cyclic shear softening phenomena appear on woven/nonwoven geotextile-sand interfaces, and the softening laws are different.When the vertical stress increases from 30 kPa to 90 kPa, the peak shear stress of woven geotextile-sandy soil interface increases by 72.9%, and the peak shear stress of nonwoven geotextile-sand interface increases by 167.5%, so the influence of vertical stress on the cyclic shear properties of geotextile-sandy soil interface is obvious.When the shear displacement amplitudes are 1, 3and5 mm respectively, the peak shear stresses of woven geotextile-sandy soil interface are 25.9, 27.9and 29.8kPa respectively, and the peak shear stresses of nonwoven geotextile-sandy soil interface are 21.8, 23.8and 22.6kPa respectively, which shows that the peak shear stress of woven geotextile-sandy soil interface increases with the increase of shear displacement amplitude, while the peak shear stress of nonwoven geotextile-sandy soil interface firstly increases and then decreases.Under the three sandy soil densities, the differences among the peak shear stresses of woven geotextile-sandy soil interface do not exceed 2kPa, and the differences among the peak shear stresses of nonwoven geotextile-sandy soil interface do not exceed 3kPa, which shows that the sandy soil density has no significant influence on the cyclic shear properties of woven/nonwoven geotextile-sandy soil interfaces.
- soil-reinforcement interface /
- geotextile /
- cyclic shear /
- shear displacement amplitude /
- density

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图 1 大型直剪仪

Figure 1. Large-scale direct shear apparatus

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图 2 土工布样品

Figure 2. Geotextile specimens

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图 3 循环剪切波形

Figure 3. Cyclic shear waveform

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图 4 土工编织布与砂土界面的剪切应力-剪切位移关系曲线

Figure 4. Relationship curves between shear stress and shear displacement of woven geotextile-sandy soil interface

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图 5 土工编织布与砂土界面滞回圈的发展阶段划分

Figure 5. Development stage division of hysteresis loop of woven geotextile-sandy soil interface

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图 6 不同竖向应力下的土工编织布与砂土界面剪切应力-时间关系曲线

Figure 6. Relationship curves between shear stress and time of woven geotextile-sandy soil interface under different vertical stresses

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图 7 不同剪切位移幅值下的土工编织布与砂土界面的剪切应力-剪切位移关系曲线

Figure 7. Relationship curves between shear stress and shear displacement of woven geotextile-sandy soil interface under different shear displacement amplitudes

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图 8 不同剪切位移幅值下土工编织布与砂土界面的剪切应力峰值发展曲线

Figure 8. Development curves of peak shear stresses of woven geotextile-sandy soil interface under different shear displacement amplitudes

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图 9 不同砂土密实度下土工编织布与砂土界面的剪切应力峰值发展曲线

Figure 9. Development curves of peak shear stresses of woven geotextile-sandy soil interface under different sandy soil densities

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图 10 无纺土工布与砂土界面的剪切应力-剪切位移关系曲线

Figure 10. Relationship curves between shear stress and shear displacement of nonwoven geotextile-sandy soil interface

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图 11 无纺土工布与砂土界面滞回圈的发展阶段划分

Figure 11. Development stage division of hysteresis loop of nonwoven geotextile-sandy soil interface

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图 12 不同竖向应力下的无纺土工布与砂土界面剪切应力-时间关系曲线

Figure 12. Relationship curves between shear stress and time of nonwoven geotextile-sandy soil interface under different vertical stresses

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图 13 不同剪切位移幅值下的无纺土工布与砂土界面剪切应力-剪切位移关系曲线

Figure 13. Relationship curves between shear stress and shear displacement of nonwoven geotextile-sandy soil interface under different shear displacement amplitudes

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图 14 不同砂土密实度下无纺土工布与砂土界面的剪切应力峰值发展曲线

Figure 14. Development curves of peak shear stresses of nonwoven geotextile-sandy soil interface under different sandy soil densities

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表 1 土工布技术指标

Table 1. Technical indices of geotextiles

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表 2 砂土的物理性质

Table 2. Physical properties of sandy soil

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表 3 循环剪切试验方案

Table 3. Cyclic shear testing programs

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