土工合成材料在路面病害处理中的应用

结合石安高速公路中修罩面时病害处理工程实践，介绍了无纺土工布和玻纤网两种土工合成材料的特性和施工工艺，得出了土工合成材料作为沥青面层增强材料能改变路面应力分布，防止裂缝产生，提高路面整体强度的结论。     

土工合成材料加筋的试验研究

以 6种不同种类的国产土工合成材料为加筋材料 ,即针刺无纺土工织物、涤纶纤维经编土工格栅、玻璃纤维土工格栅、单向塑料拉伸土工格栅、双向塑料拉伸土工格栅和土工网 ,进行三轴试验比较各种土工合成材料对砂的加筋效果 ;进行直剪试验和拉拔试验比较各种土工合成材料与填料 (砂和石灰粉煤灰 )的界面作用特性 ,得到一些有益的结论 ,可指导土工合成材料的优选和研究土工合成材料的加筋机理。     

土工合成材料在改造旧水泥混凝土路面中的应用研究

介绍了玻纤格栅、土工布在沥青加铺层改造旧水泥混凝土路面中的应用实例 ,进行了理论分析、疲劳试验。结果表明 ,采用土工合成材料可有效地减少由荷载、温度、地基脱空等产生的不利影响 ,延缓原有水泥混凝土路面的接、裂缝在沥青混凝土加铺层中的反射 ,减少加铺层厚度 ,节省工程造价     

浅谈土工格栅在公路工程中的应用

对塑料土工格栅、玻纤土工格栅和经编土工格栅的性能做了比较,对三种土工格栅的应用进行了总结,并对目前公路工程中的加筋选材问题提出了一些观点,以利于土工合成材料加筋技术在具体工程中的应用.     

土工合成材料的应用及市场

1 概述 土工合成材料,谷称“土工布”或“土工织物”,是应用于土木工程等行业的合成纤维织物的统称。它已超出传统的“织物”范围,出现了诸如土工膜、土工格栅、土工垫、土工板等产品。 土工合成材料大体上分为四大类型,即织造型、非织造型、合成型和复合型。它是一种多功能的材料,在工程应用中     

土工合成材料对路堤长期稳定性及工后沉降的负面影响分析

从土工合成材料作用机理着手,分析了在高速公路软基处理中使用土工合成材料会对路堤长期稳定性及工后沉降产生负面影响。土工合成材料的长期强度损失及模量的降低会降低路堤的长期稳定性。土工合成材料的长期变形和松弛对工后沉降也会产生一定的不利影响。某高速公路试验段实测资料表明,一层土工布对工后沉降的影响可忽略不计,两层土工布约增加工后沉降40～50mm。     

土工合成材料加筋砂土三轴试验研究

本文以 5种国产土工合成材料为加筋材料 ,它们分别是针刺无纺土工织物、涤纶纤维经编土工格栅、玻璃纤维土工格栅、聚丙烯双向土工格栅和聚乙烯土工网 ,用三轴试验比较各种土工合成材料对砂土的加筋效果 ,得到一些有益的结论 ,可指导土工合成材料的优选和研究加筋机理 ,同时指出部分国产土工合成材料产品的不足。     

土工合成材料在城市道路改造工程中的应用

结合工程实例介绍了两种新型土工合成材料——玻纤格栅及聚酯纤维在城市道路改造工程中的应用。详细介绍了工程中有关的设计方案、材料技术指标和施工工艺。工程效果证明了这一技术措施的优越性。     

土工合成材料在废弃物填埋场中的应用

介绍了国内外废弃物处理的现状和土工合成材料在废弃物填埋场中应用的情况。废弃物填埋场中所使用的土工合成材料包括土工膜,非织造土工织物和土工格栅,这些土工合成材料可起到密封隔离,排水,过滤,排气和加固填埋场边坡的作用,最后展望了土工合成材料在不保领域中广阔的发展前景。     

浅析土工合成材料在广西膨胀土路堤处治中的应用

由于广西所处的地理位置和气候,在广西不同地区的公路建设经常遇到膨胀土,给广西的公路建设带来诸多不便,近年来随着土工合成材料的出现,其在膨胀土中已得到广泛应用.本文主要介绍了土工膜与土工布、土工格栅在处治膨胀土路堤中的应用及施工,以供参考.     

Geotextile filtration opening size under tension and confinement

Nonwoven geotextiles have been used as filters in geotechnical and geoenvironmental works for half a century. They are easy to install and can be specified to meet the requirements for proper filter performance. There are situations where a geotextile filter may be subjected to tensile loads, which may alter relevant filter properties, such as its filtration opening size. Examples of such situations are silty fence applications, geotextile separators, geotextile tubes and geotextiles under embankments on soft soils. This paper investigates the effects of tensile strains on geotextile pore dimensions. A special equipment and testing technique allowed tests to be carried out on geotextile specimens subjected to tension and confinement. The results obtained showed that the variation in filtration opening size depends on the type of strain state the geotextile is subjected, under which the geotextile pore diameter may remain rather constant or increase significantly. However, confinement reduces the geotextile filtration opening size independent on the strain mobilised. An upper bound for the filtration opening size of strained nonwoven geotextiles is introduced and was satisfactory for the geotextile products tested.     

加荷条件下土工织物垂直渗透性能试验研究

作为反滤材料的土工织物尽管在岩土工程中使用越来越广泛 ,但决定其应用效果的渗透性能却在试验中往往不易准确测得。除了试验中的多种影响因素外 ,就常规渗透仪而论 ,漏水问题常常较难解决。本文使用改进的渗透仪对多种土工织物加荷条件下垂直渗透性能进行了试验研究 ,为三峡工程某排水管道中拟采用的土工积物反滤材料的设计提供了可行性对比和分析     

土工织物直剪摩擦试验研究

土与织物界面相互作用的机理十分复杂 ,80年代我国各大单位进行了不少这方面的试验和研究。本文主要介绍土工织物与土的直剪摩擦试验方面的研究     

水泥路面裂缝病害的调查及处治方法

目前现有的水泥混凝土路面都存在各种裂缝,这对道路的使用造成较大的威胁.根据湖北省咸宁市横路线横温段原混凝土路面的破坏状况进行裂缝病害处调查并归类,分析产生的原因,确定影响裂缝出现的因素,提出采用双向玻璃纤维土工格栅和长丝烧毛土工布对沥青加铺层的处治方法,取得较好的结果.     

耐碱玻纤网格与聚丙烯混凝土复合加固方柱的轴压试验研究及承载力计算

通过16个基于耐碱玻纤网格与聚丙烯混凝土复合加固方柱的轴压性能试验,得到了各试件的极限承载力与破坏形态,测得了各试件混凝土中部纵向压应力-应变曲线、试件压应力-耐碱玻纤网格中部应变曲线,分析了加固层混凝土中聚丙烯纤维含量、耐碱玻纤网格包裹方式等参数对试件轴压性能及破坏机理的影响。通过引入合理的基本假定和强度模型,提出了耐碱玻纤网格与聚丙烯混凝土复合加固方柱的轴压承载力计算方法,并将所提计算方法及相关文献计算方法得到的理论计算值与试验结果进行了比较。结果表明:试件主要破坏形态为纵向压劈破坏,裂缝最先出现在试件角部区域并向两端发展,部分试件出现加固层剥离现象; 相较于耐碱玻纤网格间隔包裹试件,全包试件表现出更好的抗压性能及延性; 随着加固层混凝土中聚丙烯纤维含量的增加,试件极限承载力呈先提高后降低的趋势; 采用所提计算方法得到的理论计算值与试验结果吻合较好,且理论计算值均小于试验值,说明所提公式具有一定安全储备,可供工程设计参考使用。     

Investigation of tensile strength on alkaline treated and untreated kenaf geotextile under dry and wet conditions

Geosynthetics or geotextile is used for aggregate separation, soil reinforcement, filtration, drainage and moisture or liquid barriers in geotechnical applications. Because of the environmental issues, a bio-based material is introduced as a sustainable construction material. The kenaf fibre is a bio-based material available in the tropical countries. It can be potentially used as a geotextile because of its high tensile strength. This paper presents the tensile strength characteristics of kenaf geotextile, manufactured with and without sodium hydroxide (NaOH) treatment. The tensile strength of kenaf geotextile was determined by using the wide-width strip test based on the ASTM D4595-17 standard. Because the kenaf fibre has a high water absorption capability, the effect of wet and dry conditions on tensile behaviour of kenaf textile was studied. Two patterns of woven kenaf with two different opening sizes between their yarns (0 × 0 and 2 × 2 mm)—plain and incline patterns were studied. In addition, the tensile strength of the kenaf geotextiles, buried in natural ground, was examined after a one-year period. The tensile strength of kenaf geotextiles was higher for the smaller spaces between the yarns. Furthermore, the tensile strength and elongation were lower under wet condition. The alkaline treatment (6% concentration of NaOH) significantly improved the tensile strength of the woven kenaf geotextile. The tensile strength of the treated kenaf geotextile was higher than that of the untreated one, for both short and long-term conditions, showing the advantage of NaOH treatment.     

A case study on utilizing geotextile tubes for tailings dams construction in China

This research presents a successful case, in which geotextile tubes have been used to construct a tailings dam for fine tailings disposal since 2008. Up to the end of 2016, the tailings dam raise has reached 9?m in height. The total height of the dam including the starter dike was 61?m. In order to ensure that the tailings reservoir is safe in its current condition and during future construction, the comprehensive geotechnical investigation and stability analyses of the tailings embankment are conducted in this study. The results show that the application of geotextile tubes in the construction of tailings dam is a good alternative for fine tailings disposal.     

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。     

Electro-mechanical behaviour of graphene-based geotextiles for pavement health monitoring

Smart geosynthetics have attracted significant interest for potential applications in geotechnical structures owing to their conductive properties. This paper presents an analysis of the electro-mechanical response of graphene-based geotextiles for application in pavements. Experimental and numerical studies were conducted on a commercially available graphene-coated geotextile to understand its response to induced strains. The material was subjected to tensile loading with the effect of transverse strains also being tested, utilizing Digital Image Correlation (DIC). Experimental results indicated a significant electro-mechanical behaviour in the geotextile, with the relative resistance change being non-linear with applied strain. Existing analytical solutions could not predict the observed behaviour; hence, a multi-physics numerical model was developed using concepts of piezoresistivity to capture the non-linear behaviour. The numerical model was calibrated using the experimental data and then validated with experimental data from tests conducted for different specimen sizes. The model could capture the non-linear electro-mechanical behaviour and the electrical response due to axial and transverse strains in the material. This study is expected to serve as a basis for using graphene-based geotextiles for structural health monitoring (SHM) purposes in geotechnical structures, such as in roads.     

Geotextile filtration principles, practices and problems

Geotextile filters are rapidly replacing graded granular filters as the standard of practice in geotechnical design. This paper reviews the current state of the practice in designing with geotextiles including a listing of the most widely recognized design criteria. Problems with the current practice are also recognized that present challenges to the geotextile community in order to increase the acceptance and utilization of geotextiles in this valuable application.