Comparation and analyses of direct shear test and pull-out test of the interface between soils and geosynthetics
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摘要: 直剪试验和拉拔试验是研究土工合成材料与土界面剪切特性的两种手段,但二者的试验机理存在明显的差异。本文根据筋土界面直剪试验和拉拔试验结果,对这两种试验方法进行了对比分析,探讨了直剪试验和拉拔试验得到的界面剪切强度之间的差别及其原因。试验结果表明:对于机织土工布来说,直剪试验的结果与拉拔试验得到的界面剪切强度相近,但峰值位移差别较大;对于玻纤格栅来说,直剪试验得到的界面剪切强度大于拉拔试验的结果。Abstract: Direct shear test and pull-out test are two means to quantify the interaction characteristics of the interface between soils and geosynthetics, but the mechanism of both is so much different.In this paper,the comparison o of the two experimental methods is carried out according to the results from direct shear test and pull-out test.It’s discussed that the differences and reasons of the interface shear strength obtained from direct shear test and pull-out test.The results of test show that: for woven geotextiles,the shear strength from direct shear test and pull-out test is more or less the same,but the peak displacement of which is so much different;as for the glass fiber grid,the shear strength of direct shear test is greater than that of pull-out test.
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Key words:
- geosynthetics /
- soil-geosynthetic interface /
- direct shear test /
- pull-out test /
- comparative
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