|Table of Contents|

Cyclic shear dynamic properties of geotextile-sandy soil interfaces(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年06期
Page:
12-20
Research Field:
道路与铁道工程
Publishing date:
2016-12-20

Info

Title:
Cyclic shear dynamic properties of geotextile-sandy soil interfaces
Author(s):
WANG Jun1; 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;
Keywords:
soil-reinforcement interface;  geotextile;  cyclic shear;  shear displacement amplitude;  density
PACS:
U416.1
DOI:
-
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 90 kPa respectively, the cyclic shear displacement amplitudes are 1, 3 and 5 mm respectively, and the sandy soil densities are 22%, 52% and 75% respectively, their influences 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, 3 and 5 mm respectively, the peak shear stresses of woven geotextile-sandy soil interface are 25.9, 27.9 and 29.8 kPa respectively, and the peak shear stresses of nonwoven geotextile-sandy soil interface are 21.8, 23.8 and 22.6 kPa 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 2 kPa, and the differences among the peak shear stresses of nonwoven geotextile-sandy soil interface do not exceed 3 kPa, which shows that the sandy soil density has no significant influence on the cyclic shear properties of woven/nonwoven geotextile-sandy soil interfaces. 3 tabs, 14 figs, 25 refs.

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Last Update: 2016-12-20