土工合成材料在防治路面反射裂缝中的应用

概述了土工合成材料防治路面裂缝的效果,分析了土工合成材料防治路面反射裂缝的机理和影响因素,并介绍了土工合成材料沥青罩面的设计方法。     

土工合成材料在防治路面反射裂缝中的应用

概述了土工合成材料在防治路面反射裂缝中的效果 ,分析了土工合成材料防治路面反射裂缝的机理和影响因素 ,并介绍了土工合成材料沥青罩面的设计方法。     

土工合成材料在沥青路面施工和养护工程中的应用

介绍了沥青路面的优点,简述了土工合成材料的主要品种和特性,并从土工合成材料的选择、施工工序和基本要求等方面,阐述了土工合成材料在沥青路面施工中的应用,指出使用土工合成材料能有效遏制路面裂缝的产生,证明了土工合成材料在道路补强工程中的优异性能。     

土工合成材料处治老路路基拓宽的数值分析

随着交通量的日益增加，老路拓宽已经成为公路建设非常重要的～种手段。为减少老路拓宽新老路基不均匀沉降，提高路基整体稳定性，土工合成材料在新老路基结合部处治中获得很大的成功。针对老路拓宽时采用土工合成材料处治结合部的特点，将新老路基、路面结构作为整体，建立数值模型。采用FLAC进行分析，主要从路基位移、路基项面应力及土工合成材料拉力分布等方面，研究土工合成材料处治新老路基结合部的作用机制，分析不同加筋层数和不同路基填土高度下的处治效果。计算结果表明，采用土工合成材料不仅可以有效地减小路基顶面的差异沉降和水平位移，而且使得路基反射到路面的平均应力更小且分布均匀。     

城市沥青路面加铺中土工合成材料应用浅析

结合土工合成材料在路面加铺中的技术要求，物理与力学特性等特征，给出综合应用建议，指出该方法具有适应城市道路发展趋势需求的技术与经济价值，以期促进该土工合成材料的推广和应用。     

土工合成材料在公路工程中的应用

详细介绍了土工合成材料的种类及其各种性能指标 ,结合公路工程实际阐述了土工合成材料所具有的加筋、过滤、排水、防渗、路基防护和路面裂缝防治等多种功能 ,并分析了当前土工合成材料使用与开发中出现的一些问题。     

浅谈土工合成材料在路基边坡防护中的应用

实践表明,一种新型的土工合成材料主要有：土工织物、土工薄膜、复合型土工合成材料、特种土工合成材料等,在应用于竖直挡土墙及陡坡等的排水系统、加固、大坝、侵蚀控制等方面后,则明显改善了路基边坡的稳定性,提升了路面质量。     

国内岩土工程业近10年来发展成熟的技术统计(三)

15 土工合成材料应用技术 (1)主要技术内容 土工合成材料是一种新型的岩土工程材料,分为土工织物、土工膜、特种土工合成材料和复合型土工合成材料等种.     

土工合成材料在公路工程中的应用

土工合成材料是工程建设施工中常用的材料,其属于一种新型的材料,而且具有操作简单、经济节省等优点,近年来,土工合成材料在公路工程中应用越来越多,并收到了良好的效果,提高了公路工程的施工质量以及美观性,而且还延长了公路的使用年限。土工合成材料是由高分子聚合物构成的,其具有较高的防水性,应用在公路工程中,可以增加公路的防渗效果,还可以降低路面出现裂缝的概率。论文对土工合成材料在公路工程中的应用情况进行简单的分析与介绍,希望对施工单位提供一定可借鉴经验。     

土工合成材料在公路建设中的应用

概述了土工合成材料的发展，阐述了土工合成材料的特性及其在公路工程中的应用，指出了存在的问题，并提出了较为合理的预防措施，以推广土工合成材料在公路建设中的应用。     

Performance of geosynthetic-reinforced flexible pavements in full-scale field trials

The paper presents the results of a series of full-scale trials carried out in Thailand examining the performance of geosynthetics as reinforcement for flexible pavements. The geosynthetics were embedded at different pavement depths and the structural response was monitored across four test sections by means of strain gauges, pressure sensors, deflection points and deflection plates. The results show that all reinforcement configurations helped reduce the vertical static stresses developed at the base of the pavement by up to 66% and by up to 72% for dynamic stresses. The performance enhancement expected to prolong the lifespan of the base layers. The reinforcement layers closer to the base experienced the highest lateral strains of up to 0.13%, providing evidence that geosynthetics can also effectively reduce lateral spreading. All reinforcement configurations helped enhance rut resistance with maximum traffic benefit ratio (TBR) of 13.70, effectiveness ratio (EF) of 12.70 and minimum rutting reduction ratio (RRR) of 0.74. The best configuration included a geotextile within the asphalt concrete layer and a geogrid under the base layer. Non-linear finite element analyses of the test sections predicted very well the strains and stresses in the pavement. The study provides a benchmark for future studies in this field and concludes that geosynthetics can help increase maintenance periods and extend the lifetime of flexible pavements.     

土工合成材料在沥青路面施工中的应用

指出了目前沥青混凝土路面存在的突出问题以及采用改性沥青和SMA技术解决这些问题时存在的不足,介绍了采用土工合成材料引入沥青混凝土路面的优点及其在施工中的应用情况,收到了显著的经济效果。     

Geosynthetic-stabilized flexible pavements: Solution derivation and mechanistic-empirical analysis

Geosynthetics have been widely applied in flexible pavements for decades. However, the mechanistic-empirical analytical approach for geosynthetic-stabilized flexible pavements based on the elastic solution derived from the layered elastic theory has not been established. In this study, the solution for a typical three-layer geosynthetic-stabilized flexible pavement was derived according to the layered elastic theory. In the derivation, lateral restraint and tensioned membrane effect of geosynthetics quantified in terms of layer permanent deformations were considered at the interface as a continuity condition. The derived solution was then incorporated into the mechanistic-empirical approach for the calculation of pavement rutting and fatigue cracking. The result indicates that the solution derived in this study is capable of analyzing the geosynthetic-stabilized three-layer flexible pavement. The pavement elastic responses calculated using the solution obtained in this study are in line with those by the previously established solutions in the literature. The rut depths estimated using the proposed solution reasonably match those measured in the previous study. For rut reduction, the geosynthetic placed underneath the base layer is more effective. For the tensile strain relief at the bottom of the asphalt layer, the geosynthetic placed at the bottom of the asphalt shows more benefit.     

A strategic laboratory approach for the performance investigation of geogrids in flexible pavements

Nowadays, the increasing request in terms of road transport makes maintenance and rehabilitation of road infrastructures key tasks for road engineering. In recent years, numerous products/materials have been introduced on the market and can be used in combination or singly in order to extend pavement life and guarantee high performance. Among them, geosynthetics can play different roles in pavement structures, such as draining, reinforcement, filtering, separation, protection, and proofing. This research focuses on the validation of a strategic laboratory approach for the study of the mechanical performance of reinforced systems used in flexible pavements, combining repeated loading cycles in a four-point bending configuration with interlayer shear tests. This method can be used in further research analysis to compare unreinforced and reinforced double-layered systems. The results obtained in this investigation showed that the fiberglass grid used provides a relevant contribution to the performance of the asphalt concrete system studied.     

土工合成材料在城市固体垃圾填埋场中的应用

对一系列新型化工产品———土工合成材料在城市固体垃圾填埋场中的应用 ,特别对其中土工织物 (GT)、土工膜 (GM)、土工合成材料粘土垫 (GCL)、土工网 (GN)、土工复合材料 (GC)以及土工泡沫 (GF)等在填埋场衬垫、封盖系统中的应用作了全面的总结 ,详尽地分析了各种材料的主要用途     

加筋土结构中筋材拉拔力的分布规律研究

分析了加筋材料在拉拔试验条件下,筋材所受到的拉力、剪应力、应变之间的关系,利用筋土界面间存在的抗剪刚度系数G,建立起了与材料拉伸模量E_r和G有关的拉拔影响系数α,从而推导出拉力沿筋材分布的公式和各点筋土的相对位移公式。通过与已有的试验数据相对比,证实该公式的可行性。分析了拉力在筋材上的传播规律和α对筋材拉拔力分布的影响,表明用α能综合反映压应力、摩阻力、土体性质等多种因素对筋材拉力的影响。在加筋土结构中,筋材位移不是很大时,采用该公式能较好地估算筋材各处的拉力。     

Electrokinetic geosynthetics in hydraulic applications

In use most geosynthetics play a passive role. New applications for geosynthetics have been identified if they can provide an active role, initiating biological, chemical or physical change to the matrix in which it is installed as well as providing the established functions. This can be achieved by combining the electrokinetic phenomena of electro-osmosis, electrophoresis and associated electrokinetic functions such as electrolysis with the traditional functions of geosynthetics of drainage, filtration, containment and reinforcement to form electokinetic geosynthetics (EKG). Electrokinetic geosynthetics can be made singly or from combinations of woven, non-woven, needle punched knitted, extruded or laminated materials and can be formed in any 2D or 3D shape.The majority of the uses of EKG are in hydraulic applications or applications with a significant hydraulic component. These can be grouped in separate engineering categories such as civil, mining, and water engineering. The concept of electrokinetic geosynthetics is described and details of applications and case studies are provided in the paper.     

A multi-camera based photogrammetric method for three-dimensional full-field displacement measurements of geosynthetics during tensile test

Conventional methods for measuring the deformational response of geosynthetics, such as the linear variable differential transformers (LVDTs), strain gauges, and extensometers have several limitations in fully determining the complete strain distribution in geosynthetics. This paper presents a multi-camera based photogrammetric method to track the 3D full-field displacements of geosynthetics during tensile tests. The proposed method extends the conventional one-camera based photogrammetry for static object measurements to multi-camera-based photogrammetry for object measurements with continuous movements or deformations. It is non-contact, cost-effective, highly accurate, and capable of measuring the 3D full-field displacements of the geosynthetics. A tensile test on a geogrid specimen was performed to verify the effectiveness and accuracy of the proposed photogrammetric method. The results from the tensile tests using both the proposed method and conventional methods, such as machine-controlled displacement measurements and extensometer, were presented and compared. It was observed that the average absolute difference between the proposed photogrammetric method and the machine-controlled movements of the bottom clamp was 0.25%, and the average absolute error was 0.038 mm. The average difference in measurements made by the proposed method and extensometer was 0.07%. It was further found that the proposed method can provide more comprehensive input, such as the complete strain and modulus distributions in the geosynthetics, for a probability-based geosynthetics design.