土工织物-砂土界面的叠环式剪切试验

doi:10.16285/j.rsm.2016.1635

›› 2018, Vol. 39 ›› Issue (5): 1775-1780.doi: 10.16285/j.rsm.2016.1635

土工织物-砂土界面的叠环式剪切试验

朱顺然¹，徐超^{1, 2}，丁金华³

1. 同济大学地下建筑与工程系，上海 200092；2. 同济大学岩土工程与地下结构教育部重点实验室，上海 200092； 3. 长江科学院水利部岩土力学与工程重点实验室，湖北武汉 430010

收稿日期:2016-07-06 出版日期:2018-05-11 发布日期:2018-06-12
作者简介:朱顺然，男，1993年生，硕士研究生，主要从事加筋土-结构方面的研究
基金资助:
国家自然基金项目（No. 41772284）；科技部重点研发计划（No. 2016FYE0105800）

Laminated shear test of geotextile-sand interface

ZHU Shun-ran¹, XU Chao^{1, 2}, DING Jin-hua³

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan, Hubei 430010, China

Received:2016-07-06 Online:2018-05-11 Published:2018-06-12
Supported by:
This work was supported by National Science Foundation of China (41772284) and the Key Research and Development Project for the Ministry of Science and Technology of China (2016FYE0105800).

摘要/Abstract

摘要： 针对土工合成材料界面特性试验易受试验装置影响的特点，采用大型叠环式剪切仪进行土工织物与砂土的界面剪切试验。对比砂土本身、土工织物与砂土的两种剪切试验结果发现，土工织物-砂土剪切引起的叠环位移较小；叠环的水平位移变化规律与土体的剪胀性具有密切联系，土工织物限制了下剪切盒内土颗粒的运动，对达到峰值强度时的土体剪胀也具有抑制作用。由试验结果可知，筋-土界面的剪切带远小于剪切的影响范围，土工织物在界面剪切中的作用不能仅通过剪切带反映，还应考虑土工织物的屏蔽作用和对于土体剪切带形成的影响。

关键词: 土工合成材料, 叠环式剪切试验, 加筋影响范围, 剪切带, 剪胀性

Abstract: Considering that the measured interface properties between soils and geosynthetics are prone to being influenced by experimental apparatus, authors applied large-scale laminated shear apparatus to conduct the shear tests on interface between geotextile and sand instead of common direct shear apparatus. The comparative analysis of the results from laminated shear tests shows that the displacements of laminated rings of sand with geotextile are smaller than those in shear tests of sand. The horizontal displacement of each ring is closely related to the dilatancy of sand. The geotextile limits the movement of soil particles in lower shear box and reduces the dilatancy ratio of sand at the peak interface shear strength. It can be inferred from the experimental results that the shear band caused by the interface shear between geotextile and soil is much narrower than its influencing range. The effect of geotextile in the interface shear test cannot be reflected only by the size of shear band, but also by the shielding function of geotextile from shear and its influence on the development of shear band in soil.

Key words: geosynthetics, laminated shear test, reinforcement influencing range, shear band, dilatancy

中图分类号:

TU 411

朱顺然，徐超，丁金华，. 土工织物-砂土界面的叠环式剪切试验[J]. , 2018, 39(5): 1775-1780.

ZHU Shun-ran, XU Chao, DING Jin-hua，. Laminated shear test of geotextile-sand interface[J]. , 2018, 39(5): 1775-1780.

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土工织物-砂土界面的叠环式剪切试验

Laminated shear test of geotextile-sand interface

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