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خانه مقالات-Article مقالات عمران-Civil Articles Experimental Investigation of Time-Dependent Effect on Shear Strength Parameters of Sand–Geotextile Interface
Experimental Investigation of Time-Dependent Effect on Shear[taliem.ir]

Experimental Investigation of Time-Dependent Effect on Shear Strength Parameters of Sand–Geotextile Interface

رایگان!

The time-dependent behavior of soils has been investigated extensively using one-dimensional and triaxial tests. The phenomena  associated with time effects in soils are creep, relaxation, strain rate and rearrangement effects. The engineering properties of soil are  often improved significantly with the time elapse. The objective of this paper is to investigate the time-dependent effect on the shear  strength parameters of sand–geosynthetic interface using large direct shear test apparatus. For this purpose, the geotextile layer has  been adhered gently on a piece of wood with a thickness such that a half of the shear test box has been occupied. The other half of  the box has been filled with the sand and the test has been performed. Three normal stresses of 30, 45, and 60 kPa have been   applied in all tests. The shear stress has subsequently been applied in different times to the failure stage. In all tests, the shearing  velocity has been kept the same. The results of these experiments show that the stiffness and friction angle of the dry sand– geotextile interface increases up to 12.6% and 3.9% at 720 minutes after the sample is poured in the mold

توضیحات محصول

ABSTRACT

The time-dependent behavior of soils has been investigated extensively using one-dimensional and triaxial tests. The phenomena  associated with time effects in soils are creep, relaxation, strain rate and rearrangement effects. The engineering properties of soil are  often improved significantly with the time elapse. The objective of this paper is to investigate the time-dependent effect on the shear  strength parameters of sand–geosynthetic interface using large direct shear test apparatus. For this purpose, the geotextile layer has  been adhered gently on a piece of wood with a thickness such that a half of the shear test box has been occupied. The other half of  the box has been filled with the sand and the test has been performed. Three normal stresses of 30, 45, and 60 kPa have been   applied in all tests. The shear stress has subsequently been applied in different times to the failure stage. In all tests, the shearing  velocity has been kept the same. The results of these experiments show that the stiffness and friction angle of the dry sand– geotextile interface increases up to 12.6% and 3.9% at 720 minutes after the sample is poured in the mold.

INTRODUCTION

For the past three decades, the use of geosynthetics to reinforce soil mass has been grown significantly. Nowadays, they are a well– accepted construction material. The use of reinforcement objects increases resisting forces in the soil mass through the tensile force  provided by reinforcement elements, and consequently reducing the horizontal deformations and increasing the overall stability of the  oil structure  Therefore, the evaluation of soil-geosynthetic interface parameters, the interface friction angle, δ, and adhesion, ca,  is important for the design of reinforced soil structures. The soil–geosynthetic interaction parameters are influenced by a) interaction   mechanism between geomaterials and geosynthetics (pull-out or direct shear), b) physical and mechanical properties of geomaterials  (density, grain shape and size, grain size distribution, water content, and plasticity of clayey soils), and c) mechanical properties (tensile  peak strength), shape and geometry of geosynthetics. Although the shear strength of soil/geosynthetic interface has been  investigated by conducting other tests, such as tilt table tests  and torsional ring shear tests , the direct shear test is still  the most common testing method.

Year: 2011

Publisher : Sixth National Congress on Civil Engineering

By :  Mahmoud Ghazavi , Javad Ghaffari

File Information: English Language/ 6 Page / size: 153 KB

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سال : 1390

ناشر : ششمین کنـگره ملی مهنـدسی عمـران

کاری از : محمود غزوی، جواد غفاری

اطلاعات فایل : زبان انگلیسی / 6 صفحه / حجم : KB 153

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