长江科学院院报 ›› 2017, Vol. 34 ›› Issue (2): 41-44.DOI: 10.11988/ckyyb.20160281

• 加筋机理及加筋土结构 • 上一篇    下一篇

土工格栅与砂垫层界面力学特性试验研究

张骏1,林永亮1,张波2   

  1. 1.上海大学 土木工程系,上海 200072;
    2.上海市建工设计研究院有限公司,上海 200050
  • 收稿日期:2016-03-28 修回日期:2016-06-08 出版日期:2017-02-01 发布日期:2017-02-08
  • 通讯作者: 林永亮(1977-),男,山东烟台人,讲师,博士,主要从事土工加筋技术、土动力学研究,(电话)15821366195(电子信箱) lin_yliang@163.cm。
  • 作者简介:张 骏(1990-),男,安徽合肥人,硕士研究生,主要从事土工加筋技术研究,(电话)15618989662(电子信箱)1142182055@qq.com。
  • 基金资助:
    国家自然科学基金项目(51209132)

Experimental Investigation on Mechanical Behaviours of the Interface between Geogrid and Sand Cushion

ZHANG Jun 1, LIN Yong-liang1, ZHANG Bo2   

  1. 1.Department of Civil Engineering, Shanghai University, Shanghai 200072, China;
    2.Shanghai Construction Group, Shanghai 200050, China
  • Received:2016-03-28 Revised:2016-06-08 Online:2017-02-01 Published:2017-02-08

摘要: 筋土间相互作用是加筋土强度提高的根本原因,是土工合成材料加筋加固应用中的核心问题。通过室内拉拔试验,分析了法向应力、砂垫层厚度、土工格栅横肋间距3个因素对加筋体极限拉拔力的影响,从宏观角度揭示了筋土界面间的力学特性。结果表明:增设5 cm厚的砂垫层后,格栅的极限拉拔力得到显著提高;高法向应力下,砂垫层厚度对拉拔试验结果影响更显著;在土工格栅加筋软土体中,增大横肋间距会减小筋土界面摩擦角,但是对黏聚力影响不大;格栅网格形态是筋土界面特性的重要影响因素。

关键词: 土工格栅, 拉拔试验, 加筋砂垫层, 横肋间距, 筋土界面参数

Abstract: The interaction between soil and reinforcement is the fundamental cause of the strengthening of reinforced soil. It is also a key issue in the application of geosynthetic reinforced soils. In this article, the effects of normal stress, sand cushion thickness and spacing between transverse ribs on ultimate pullout resistance of reinforced body were analyzed through pullout test. The mechanical properties of reinforcement-soil interface were also revealed in a macro-sense. Results suggest that sand cushion of 5 cm thickness could remarkably enhance the ultimate pullout resistance of geogrid. The influence of sand cushion thickness on test result is more obvious under large normal stress. Moreover, the frictional angle of geogrid-soil interface decreases with the increasing of the spacing between transverse ribs; but the cohesion stays stable. The shape of geogrid is also an important factor affecting the properties of interface between reinforcement and soils.

Key words: geogrid, pullout test, reinforced sand cushion, spacing between transverse ribs, parameters of geogrid-soil interface

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