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Measurement of geotextile deformation allows an in-depth understanding of the behavior of geotextiles. However, attaching strain gauges to geotextiles poses a challenge as geotextiles are soft and have a fibrous surface. A properly installed strain gauge must not only adhere firmly to the geotextile, but also the method of strain gauge attachment must not change the surface properties of the geotextile significantly. Two common methods of geotextile strain measurement are attaching strain gauges directly or the geotextile with an adhesive agent and mounting electronic sensors by means of two end plated fixed to the geotextiles. The first method will inherently stiffen the localized area of the geotextile due to the introduction of the adhesive agent. In the second method, the electronic sensors are generally large, bulky and expensive. Therefore, a new strain gauging method is proposed which is intended to minimize or eliminate the limitations of the present strain measurement methods. This new method makes use of the idea of attaching gauges externally to a thin plastic strip whose ends are connected to the geotextile via two end plates. hence, the geotextile region where the strain is measured remains virtually unaffected. because of the relatively low modulus of the plastic strip, its stain is nearly the same as that of the geotextile. The results show that the proposed method is able to measure the true global strain developed in the geotextile with a correction factor of about 1.1. This method allows registration of strains up to about 10% and has very little stiffening effect on the geotextile.
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One of the newer families of geosynthetic product is geotextile tube, container and bag which could be effectively used in the containment of dredged material or clayey soils. In the recent decade, geotextile tube, container and bag with various dimension and shape are widely applied for offshore protection and land reclamation project. From geotechnical engineering point of view, the estimation of the settlement and the prediction of consolidation process of clay-filled geotextile bag would be ...
Installation stress in prefabricated vertical drains
Prefabricated vertical drains (PVDs) normally consist of a core and a filter (sleeve) made with polymeric materials. Modern installation rigs are capable of installing them at considerable speed in soft soil deposits. This note reports the tension developed in a PVD filter sleeve during the installation process, which was monitored with strain gauges. A tension of about 1,000 N was measured near the shoe shortly after the commencement of mandrel withdrawal. The need to watch the stresses in PVD ...
Structural Contribution of Geosynthetic-Reinforced Working Platforms in Flexible Pavement
PUBLISHED | 2005 in Transportation Research Record [IF: 0.59]
A study was conducted in the field and with a large-scale model experiment (LSME) to evaluate the structural contribution of a 0.30-m-thick geosynthetic-reinforced granular layer used as a working platform for construction over soft subgrade. The study was conducted in the context of the 1993 AASHTO design guideline, in which the structural number (SN) of the pavement is based on layer coefficients (each defined using a resilient modulus). Working platforms reinforced with geosynthetics had smal...
Thinking outside the box: The time dependent behaviour of a reinforced embankment on soft soil
PUBLISHED | 2010 in Materials & Design [IF: 4.36]
Abstract Applications of eco-friendly geotextiles are gaining a preference over traditional polymeric geotextiles as measures to reinforce earth embankments. Understanding the behaviour of these eco-friendly geotextiles sometimes known as limited life geotextiles (LLG) is in its infancy. This paper explains the behaviour of an embankment reinforced with Sisal fibre geotextiles constructed within a box. The diminishing need for geotextile is represented by an external load ‘outside the box’ which...
Analysis of Factors Affecting Strain Distribution in Geosynthetics
Localized strains due to production defects, seams, and punctured zones significantly affect mechanical performance of geosynthetic materials. Accurate determination of localized strains becomes particularly important for quality control/quality assurance evaluation of these materials and may play a critical role in design problems. A battery of tensile tests was conducted on 12 different geosynthetics to assess the effects of seam type, puncture, and clamping techniques on strain distributions....
Deflection of prototype geosynthetic-reinforced working platforms over soft subgrade
PUBLISHED | 2006 in Transportation Research Record [IF: 0.59]
Large-scale experiments were conducted on working platforms of crushed rock (breaker run stone or Grade 2 gravel) overlying a simulated soft subgrade to mimic conditions during highway construction where a working platform is used to limit total deflections because of construction traffic. Tests were conducted with and without geosynthetic reinforcement to evaluate how deflection of the working platform is affected by the presence of reinforcement, type of reinforcement, and thickness of the wor...
Equivalency of Crushed Rock with Industrial By-Products and Geosynthetic-Reinforced Aggregates Used for Working Platforms During Pavement Construction
A study was conducted to define an equivalency criterion for five materials used for working platforms during pavement construction on a poor subgrade: conventional crushed rock (referred to as "breaker run") and four alternatives [i.e. Grade 2 granular backfill (referred to as "Grade 2"), foundry slag, bottom ash, and foundry sand]. Total deflection data for the equivalency assessment were obtained from a large-scale model experiment (LSME) simulating a prototype-scale pavement structure and in...