Geotextiles and Geomembranes最新文献_第7页

Optimum tack coat rate for different asphalt geosynthetic interlayers to achieve optimum shear bond strength 不同沥青土工合成材料夹层达到最佳剪切粘结强度的最佳粘涂率

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-26 DOI: 10.1016/j.geotexmem.2024.04.004

N.S. Correia , M.P.S. Silva , A. Shahkolahi

{"title":"Optimum tack coat rate for different asphalt geosynthetic interlayers to achieve optimum shear bond strength","authors":"N.S. Correia , M.P.S. Silva , A. Shahkolahi","doi":"10.1016/j.geotexmem.2024.04.004","DOIUrl":"https://doi.org/10.1016/j.geotexmem.2024.04.004","url":null,"abstract":"<div><p>Designing geosynthetics for asphalt overlay is challenging due to the diversity of paving composites and paving geogrids available on the market. Challenges remains on the ideal product and tack coat to avoid debonding failure and to increase bonding quality. This research evaluates interface shear strength properties of geosynthetic-asphalt concrete specimens using seven geosynthetic interlayers tested under different tack coat rates based on asphalt retention of geosynthetics. Leutner shear tests were conducted on laboratory-prepared asphalt concrete specimens under different interface combinations. Index asphalt retention of paving geosynthetics depended on various parameters including geosynthetics type, geotextile backing, thickness and coating. The study suggests 100% of asphalt retention of the composite as design tack rate for paving geocomposites and paving geogrid composites with permanent porous fabric backing, while 220% asphalt retention as tack coat rate is suggested for geogrids. The optimum tack coat for reinforcement composites with light fabric backing falls between the optimum tack coat rates for composites and grids. The study also showed that the interface shear bond is a complex property and is not necessarily related to the fabric backing being permanent or temporary, the mass of the fabric backing, and the geosynthetics coating type and bitumen content individually.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141264078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-dimensional numerical analysis of large-scale horizontal square anchors in geogrid-reinforced sand 土工格栅加固砂中大型水平方锚的三维数值分析

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-24 DOI: 10.1016/j.geotexmem.2024.04.005

Sougata Mukherjee, G.L. Sivakumar Babu

{"title":"Three-dimensional numerical analysis of large-scale horizontal square anchors in geogrid-reinforced sand","authors":"Sougata Mukherjee, G.L. Sivakumar Babu","doi":"10.1016/j.geotexmem.2024.04.005","DOIUrl":"10.1016/j.geotexmem.2024.04.005","url":null,"abstract":"<div><p>This paper presents a comprehensive three-dimensional numerical investigation of horizontal square anchors embedded in geogrid-reinforced sand. Prior experimental studies have demonstrated notable enhancements in anchor uplift capacity when placed below geogrid reinforcement in soil. However, these results are limited to small anchor plates tested in laboratory conditions with over-reinforced sand. In contrast, this study focuses on large field-scale anchors and explores the influence of anchor width, embedment depth, reinforcement size, stiffness, and tensile strength on uplift capacity. The findings reveal that the optimal size for geogrid reinforcement is three times the anchor width. A diminishing improvement in uplift capacity with increasing anchor width was observed. Additionally, deeper anchor embedment reduces the uplift capacity improvement in geogrid-reinforced sand. The geogrid reinforcement is found to be more efficient in the case of shallow anchors placed in loose sand. The major contribution of this paper lies in the response analysis of large anchors and providing a better understanding of the uplift mechanism in geogrid-reinforced sand.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140787793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transport parameters for PFOA and PFOS migration through GCL's and composite liners used in landfills 全氟辛烷磺酸和全氟辛烷磺酸通过垃圾填埋场使用的 GCL 和复合衬垫迁移的迁移参数

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-18 DOI: 10.1016/j.geotexmem.2024.04.002

Farah B. Barakat , R. Kerry Rowe , David Patch , Kela Weber

{"title":"Transport parameters for PFOA and PFOS migration through GCL's and composite liners used in landfills","authors":"Farah B. Barakat , R. Kerry Rowe , David Patch , Kela Weber","doi":"10.1016/j.geotexmem.2024.04.002","DOIUrl":"10.1016/j.geotexmem.2024.04.002","url":null,"abstract":"<div><p>The effect of applied stress (20, 60, and 150 kPa) on the diffusion of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) through a geosynthetic clay liner (GCL) is examined. The diffusion coefficients deduced from GCL diffusion tests for PFOA and PFOS decrease linearly with decreasing final bulk GCL void ratio (increasing applied stresses). The different components of the same GCL are also tested for PFOA and PFOS sorption. No statistically significant sorption of PFOA is observed for any of the components of the GCL. However, some sorption of PFOS onto the cover and carrier geotextiles of the GCL is observed with in an average distribution coefficient, <em>K</em><sub><em>d</em></sub> ∼2.22 ml/g for the GCL. Permeants containing different PFAS compounds are tested to assess their impact on the Geomembrane (GMB) - GCL interface transmissivity in composite liners. Results show PFAS concentrations up to 20 ppm had negligible impact on the GMB-GCL interface transmissivity. Lastly, the GCL specimens extracted from the diffusion tests are tested for hydraulic conductivity. No impact of PFAS is seen on the hydraulic conductivity of GCLs subjected to high applied loads, but a small increase is seen on the GCLs subjected to relatively low applied stresses.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140761464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

2D failure mechanisms and failure modes of a new type of geotextile tubes used for river dikes 用于河堤的新型土工织物管的二维破坏机理和破坏模式

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-16 DOI: 10.1016/j.geotexmem.2024.03.009

Berit Finklenburg, Elena-Maria Klopries, Holger Schüttrumpf

{"title":"2D failure mechanisms and failure modes of a new type of geotextile tubes used for river dikes","authors":"Berit Finklenburg, Elena-Maria Klopries, Holger Schüttrumpf","doi":"10.1016/j.geotexmem.2024.03.009","DOIUrl":"10.1016/j.geotexmem.2024.03.009","url":null,"abstract":"<div><p>A new type of small, dry-filled geotextile tubes is introduced, that, in a stacked formation, can be used as dike cores. Dikes made out of these tubes consist of great potential regarding more resilient flood protection. The geotextile protects the fill from erosion, enabling steeper slopes along with reduced material and less land consumption. The behavior and potential failure mechanisms of such dikes were investigated first by literature research and second by full-scale hydraulic model tests under systematic variation of tube number, number of textile layers, filling ratio, and fill material. The tubes were exposed to the loads of seepage and overflow. Most relevant failure mechanisms were seepage-induced sagging, lateral displacement, and overturning of the upper tube due to overflow. During seepage, the tube height was reduced by up to 22.8 % due to sagging. Overflow led to a lateral displacement of up to 13 cm and, at overflow heights of 23.1 cm and 26.8 cm, to overturning of the upper tube. The present results give new insights into the behavior of innovatively constructed geotextile tubes under hydraulic loads and serve as basis for the development of design rules.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S026611442400030X/pdfft?md5=29646a3a99b5ea30a6176299bc6ec294&pid=1-s2.0-S026611442400030X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140778336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on the static performance of geogrid reinforced aeolian sand railway embankment: Field test and discrete element simulation 土工格栅加固风化砂铁路路堤静态性能研究：现场试验和离散元模拟

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-12 DOI: 10.1016/j.geotexmem.2024.03.012

Wei Du , Rusong Nie , Yanlu Qi , Bo Ruan , Fan Mo

{"title":"Investigation on the static performance of geogrid reinforced aeolian sand railway embankment: Field test and discrete element simulation","authors":"Wei Du , Rusong Nie , Yanlu Qi , Bo Ruan , Fan Mo","doi":"10.1016/j.geotexmem.2024.03.012","DOIUrl":"10.1016/j.geotexmem.2024.03.012","url":null,"abstract":"<div><p>To enhance the mechanical properties and stability of desert railway embankments, the utilization of geogrids has proven to be an effective measure. The article conducted field tests and discrete element simulations to thoroughly examine the static performance of embankments reinforced with geogrids. The study systematically explored the macroscopic and microscopic characteristics of the geogrid-reinforced embankment under static loading. Various factors were investigated, including the horizontal laying arrangements and depth to the top layer of the geogrid, as well as key design parameters such as the number of geogrid layers, geogrid width, and vertical spacing between geogrid layers. The findings indicate a progressive enhancement in the ultimate bearing capacity of the embankment with an increase in both the number of geogrid layers and the geogrid width. Conversely, there is a decrease in ultimate bearing capacity as the depth to the top layer increases. In comparison to unreinforced embankments, reinforced embankments exhibit a reduced contact anisotropy, signifying that the geogrid effectively disperses static loads, resulting in a more uniform contact distribution. The geogrid restrains both displacement and rotation of the aeolian sand, and this restraining effect progressively strengthens with an increase in the number of geogrid layers or the geogrid width. The research findings can serve as a reference for the design and application of aeolian sand railway embankments.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140795922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective stiffness matrix calculation of geocell layer and reinforcement mechanism analysis of geocell reinforced embankment 土工格室层有效刚度矩阵计算及土工格室加固路堤的加固机理分析

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-09 DOI: 10.1016/j.geotexmem.2024.03.010

Changjun Yin , Jingjing He , Ahmed Adam Khalifa Gowi , Zhuo Li , Chenhang Zhou

引用次数: 0

Experimental study on the improvement of sludge by vacuum preloading-stepped electroosmosis method with prefabricated horizontal drain 利用预制水平排水沟的真空预加载步进式电渗法改良污泥的实验研究

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-09 DOI: 10.1016/j.geotexmem.2024.04.001

Xiaoya Bian , Haodong Yang , Hui Liu , Zhiyao Xu , Rongjun Zhang

{"title":"Experimental study on the improvement of sludge by vacuum preloading-stepped electroosmosis method with prefabricated horizontal drain","authors":"Xiaoya Bian , Haodong Yang , Hui Liu , Zhiyao Xu , Rongjun Zhang","doi":"10.1016/j.geotexmem.2024.04.001","DOIUrl":"10.1016/j.geotexmem.2024.04.001","url":null,"abstract":"<div><p>To improve the defects of low electroosmosis efficiency in the later stage and high energy consumption of conventional vacuum preloading combined with electroosmosis, the vacuum preloading-stepped electroosmosis method (VP-SEO) with prefabricated horizontal drain (PHD) was proposed for dredged sludge in this paper. In the test, waste concrete fine aggregate was used as the horizontal drainage cushion to alleviate the clogging of the PHD. The results showed that compared to vacuum preloading combined with electroosmosis (VP-EO), more drainage channels throughout the soil were produced after VP-SEO treatment, and VP-SEO could maintain a higher drainage efficiency in the later stage of treatment with improved final drainage and consolidation. The sludge treated by VP-SEO showed a significant increase in vane shear strength and a reduction in water content. Furthermore, the water loss and shrinkage of the soil surface after VP-SEO treatment were more uniform than that of VP-EO treatment, and the electroosmotic energy consumption and anode erosion were also lower. This study provides an effective improvement scheme for solidifying sludge with a high water content by conventional vacuum preloading combined with electroosmosis method.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140781076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New simple method for calculating large-strain consolidation settlement of layered soft soils with horizontal drains and vacuum preloading with comparison to test data 计算带水平排水沟和真空预加载的层状软土大应变固结沉降的新简易方法及与试验数据的比较

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-05 DOI: 10.1016/j.geotexmem.2024.03.011

Ze-jian Chen , Peng-lin Li , An Li , Jian-hua Yin , Ding-bao Song

{"title":"New simple method for calculating large-strain consolidation settlement of layered soft soils with horizontal drains and vacuum preloading with comparison to test data","authors":"Ze-jian Chen , Peng-lin Li , An Li , Jian-hua Yin , Ding-bao Song","doi":"10.1016/j.geotexmem.2024.03.011","DOIUrl":"10.1016/j.geotexmem.2024.03.011","url":null,"abstract":"<div><p>Prefabricated horizontal drains and vacuum preloading have advantages in the consolidation of ultra-soft dredged sludge and soils for maintenance dredging, reclamation, and ground improvement in coastal regions. While laboratory tests and field trial projects have been reported, a convenient analysis and design method is still unavailable. This study proposes a new simple method for the settlement analysis of soft soils considering horizontal drains, vacuum preloading, creep, and large-strain effects. A unified equation is constructed to account for various layouts of horizontal drains in consolidation. A new explicit method is developed to consider the large-strain deformation with the nonlinear evolution of permeability and compressibility of ultra-soft soils under vacuum preloading. The viscous compression is taken into account using a simplified Hypothesis B method. The proposed solution also facilitates convenient consideration of multiple layers of soils and drains subjected to staged loading. The proposed method is examined by a series of physical model tests with different horizontal drain dimensions. Finally, the method is applied in the analysis of two well-documented field cases in Hong Kong and Japan, which confirms its effectiveness and accuracy.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140790498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using strain hardening to predict the stress crack resistance of unaged and aged smooth black HDPE geomembranes 利用应变硬化预测未老化和老化黑色光滑高密度聚乙烯土工膜的抗应力开裂性能

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-04 DOI: 10.1016/j.geotexmem.2024.03.003

M. Ali, R. Kerry Rowe, F.B. Abdelaal

{"title":"Using strain hardening to predict the stress crack resistance of unaged and aged smooth black HDPE geomembranes","authors":"M. Ali, R. Kerry Rowe, F.B. Abdelaal","doi":"10.1016/j.geotexmem.2024.03.003","DOIUrl":"10.1016/j.geotexmem.2024.03.003","url":null,"abstract":"<div><p>The correlation between the single-point notched constant tensile load-stress crack resistance (SP-NCTL SCR) Test (ASTM D5397; Appendix) of smooth high density polyethylene (HDPE) geomembranes and their strain hardening modulus is investigated for both unaged and aged specimens. The strain hardening modulus was calculated based on the (force-elongation) raw data from the tensile strength test conducted at room temperature using Type IV and/or Type V specimens (as described in ASTM D638) at a test speed of 7 mm/min. Three different approaches are used to define the strain hardening modulus and to compare the representative strain hardening modulus with the SP-NCTL SCR. It is shown that the high test speed of 7 mm/min performed at room temperature provides a good correlation with the SP-NCTL SCR of different smooth black HDPE geomembranes. Additionally, the proposed method using Type V specimens predicts the SCR values during oxidative degradation close to those observed using the SP-NCTL SCR test. For the resins and conditions examined, the proposed method provides a quick assessment of the SP-NCTL SCR of unaged geomembranes when the SP-NCTL SCR takes long testing times (e.g., >1000 h) or in jurisdictions in which the use of surfactants becomes prohibited to allow conducting the SP-NCTL SCR tests.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140770376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical modelling of reinforced fill over a void considering rate-dependent stiffness of the reinforcement 考虑到钢筋的刚度随速率变化，对空隙上的加固填料进行数值模拟

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-04-02 DOI: 10.1016/j.geotexmem.2024.03.006

Fahimeh M. Naftchali , Richard J. Bathurst

{"title":"Numerical modelling of reinforced fill over a void considering rate-dependent stiffness of the reinforcement","authors":"Fahimeh M. Naftchali , Richard J. Bathurst","doi":"10.1016/j.geotexmem.2024.03.006","DOIUrl":"10.1016/j.geotexmem.2024.03.006","url":null,"abstract":"<div><p>The problem of a reinforced fill over a void has been the subject of much research in the geosynthetics literature. Previous studies have mainly focused on finding closed-form solutions to predict the tensile loads and strains in the reinforcement layer once a void develops below the fill. In this paper, a 2D finite difference (FLAC) model that implements the hyperbolic isochronous load-strain model for the reinforcement by Bathurst and Naftchali (2021) is used to investigate the influence of the rate-dependent properties of polymeric geosynthetic reinforcement materials on reinforcement tensile strains and load, and overall system performance including vertical deformation at the reinforcement elevation and at the fill surface. The paper also investigates the influence of fill soil properties and constitutive model type, foundation condition, void geometry and fill height on system performance. The results of numerical modelling are compared to predictions made using the closed-form solution of Giroud et al. (1990) and in the BSI 8006-1 (2010) design code. The results of numerical modelling demonstrate that the choice of fill height to void width and the stiffness of the rate-dependent geosynthetic reinforcement layer are important to ensure that the maximum reinforcement strain, allowable strength and fill surface settlement criteria are not exceeded.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":null,"pages":null},"PeriodicalIF":5.2,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140775585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0