筋土界面摩擦特性影响因素分析

凌天清; 周滨; 吴春波; 郑智能

doi:10.19818/j.cnki.1671-1637.2009.05.002

筋土界面摩擦特性影响因素分析

doi: 10.19818/j.cnki.1671-1637.2009.05.002

凌天清^1,,
周滨²,
吴春波^{1, 3},
郑智能¹

1.
重庆交通大学土木建筑学院, 重庆 400074
2.
广东佛开高速公路扩建工程管理处, 广东佛山 528231
3.
后勤工程学院军事建筑工程系, 重庆 400041

基金项目:

广东省交通科技重点项目 2005.02

详细信息

作者简介:
凌天清(1962-), 男, 四川资阳人, 重庆交通大学教授, 工学博士, 从事路基路面工程研究

中图分类号: U416.14
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- 被引次数: 0
出版历程
- 收稿日期: 2009-07-23
- 刊出日期: 2009-10-25

Study of influence factors on tendons-soil interface characteristic

1.
School of Civil Engineering and Architecture, Chongqing Jiaotong University, Chongqing 400074, China
2.
Extension Project Management Office of Guangdong Fokai Expressway, Foshan 528231, Guangdong, China
3.
Department of Architecture and Civil Engineering, Logistical Engineering University, Chongqing 400041, China

More Information

Author Bio:
LING Tian-qing(1962-), male, professor, PhD, +86-23-62652702, ilingtq@163.com

摘要

摘要: 以整体式单向聚乙烯土工格栅与钢塑复合加筋带为加筋材料, 以含细粒土砂为填料, 设计了高速公路拓宽工程加筋边坡。通过室内拉拔试验对填料在不同含水量和不同压实度条件下与土工格栅之间的摩擦特性进行分析, 并对比了原样土工格栅、去除横肋的土工格栅和土工加筋带三者之间的界面摩擦特性。分析结果表明: 在填料含水量高于填料的最佳含水量时, 筋土界面强度随着含水量增加而降低, 且变化明显, 随着填料压实度的提高而不断增强, 加筋效果也明显增强; 土工格栅的横肋对筋土界面特性影响非常明显, 贡献率高达50%以上。
- 道路工程 /
- 加筋土 /
- 拉拔试验 /
- 含水量 /
- 压实度 /
- 土工格栅横肋 /
- 界面摩擦特性
Abstract: A rib-reinforced slope in expressway's widening engineering was designed, in which holistic and unilateral polyethylene geogrid and steel-plastic composite geobelt were taken as enhancement materials and sand with fine-grained soil was taken as fill.The friction performance of tendons-soil interface was analysed by pull-out test in laboratory under different water contents and compactions.The enhancement effects of original geogrid, the one without horizontal ribs and reinforcement geobelt were compared.It is found that when the fill's water content is higher than its optimum moisture content, the tendons-soil interface strength reduces with the increase of water content, which is obvious.With the rise of the fill's compaction, the interface strength increases unceasingly and the reinforcement effect is distinct.The horizontal ribs' contribution rate to the interface characteristic of reinforcement soil is over 50%.
- road engineering /
- reinforced earth /
- pull-out test /
- water content /
- compaction /
- horizontal rib of geogrid /
- friction performance of tendons-soil interface

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图 1 拉拔试验盒

Figure 1. Pull-out test box

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图 2 试验原理

Figure 2. Test principle

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图 3 去除横肋后的土工格栅

Figure 3. Geogrid without horizontal ribs

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图 4 含水量为11.5%的拉拔力与拉拔位移曲线

Figure 4. Drawing force-drawing displacement curves under 11.5% water content

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图 5 含水量为14.5%的拉拔力与拉拔位移曲线

Figure 5. Drawing force-drawing displacement curves under 14.5% water content

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图 6 含水量为19.5%的拉拔力与拉拔位移曲线

Figure 6. Drawing force-drawing displacement curves under 19.5% water content

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图 7 不同含水量下剪切力与法向力曲线

Figure 7. Shearing force-normal force curves under different water contents

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图 8 压实度为80%的拉拔力与拉拔位移曲线

Figure 8. Drawing force-drawing displacement curves under 80% compaction

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图 9 压实度为85%的拉拔力与拉拔位移曲线

Figure 9. Drawing force-drawing displacement curves under 85% compaction

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图 10 压实度为90%的拉拔力与拉拔位移曲线

Figure 10. Drawing force-drawing displacement curves under 90% compaction

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图 11 不同压实度下剪切力与法向力曲线

Figure 11. Shearing force-normal force curves under different compactions

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图 12 基于含肋土工格栅的拉拔力与拉拔位移曲线

Figure 12. Drawing force-drawing displacement curves based on geogrid with horizontal ribs

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图 13 基于去肋土工格栅的拉拔力与拉拔位移曲线

Figure 13. Drawing force-drawing displacement curves based on geogrid without horizontal ribs

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图 14 土工格栅含肋与否的剪切力与法向力曲线

Figure 14. Shearing force-normal force curves based on geogrids with horizontal ribs or not

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表 1 不同含水量和压实度下的拉拔试验对比方案

Table 1. Comparison of pull-out test programmes under different water contents and compactions

试验组号	填料	筋材	含水量/%	压实度/%
T1	含细粒土砂	土工格栅	11.5	85
T2			14.5
T3			19.5
T4			11.5	80
T5			11.5	90

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表 2 不同加筋材料拉拔试验对比方案

Table 2. Comparison of pull-out test programmes under different tendons materails

试验组号	填料	筋材	含水量/%	压实度/%
T4	含细粒土砂	土工格栅	11.5	80
T6	含细粒土砂	拉筋带	11.5	80

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表 3 含肋与去肋土工格栅拉拔试验对比方案

Table 3. Comparison of pull-out test programmes of geogrids with horizontal ribs or not

试验组号	填料	筋材	含水量/%	压实度/%
T7	含细粒土砂	含肋土工格栅	19.5	85
T8	含细粒土砂	去肋土工格栅	19.5	85

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表 4 不同含水量下的筋土界面参数

Table 4. Tendons-soil interface parameters under different water contents

含水量/%	11.5	14.5	19.5
粘聚力/kPa	2.81	2.80	1.92
界面摩擦系数	0.43	0.34	0.24

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表 5 不同压实度下的筋土界面参数

Table 5. Tendons-soil interface parameters under different compactions

压实度/%	80	85	90
粘聚力/kPa	1.95	2.81	3.24
界面摩擦系数	0.31	0.43	0.52

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表 6 不同加筋材料下的筋土界面参数

Table 6. Tendons-soil interface parameters under different tendons materials

筋材类型	土工格栅	拉筋带
粘聚力/kPa	2.01	0.61
界面摩擦系数	0.31	0.27

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表 7 土工格栅含肋与否的筋土界面参数

Table 7. Tendons-soil interface parameters under geogrids with horizontal ribs or not

土工格栅类型	含肋格栅	去肋格栅
粘聚力/kPa	1.92	0.95
界面摩擦系数	0.24	0.12

下载: 导出CSV

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