Geotextiles and Geomembranes最新文献_第8页

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":"52 4","pages":"Pages 598-611"},"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":"52 4","pages":"Pages 635-653"},"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

Evaluation of arched EPS block and geocell inclusions in trench backfill for protection of buried flexible pipes 评估沟槽回填土中的拱形 EPS 块和土工格室夹杂物，以保护埋设的柔性管道

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-03-30 DOI: 10.1016/j.geotexmem.2024.03.008

S.N. Moghaddas Tafreshi , N. Joz Darabi , M. Azizian , B.C. O'Kelly , A. Faramarzi

{"title":"Evaluation of arched EPS block and geocell inclusions in trench backfill for protection of buried flexible pipes","authors":"S.N. Moghaddas Tafreshi , N. Joz Darabi , M. Azizian , B.C. O'Kelly , A. Faramarzi","doi":"10.1016/j.geotexmem.2024.03.008","DOIUrl":"10.1016/j.geotexmem.2024.03.008","url":null,"abstract":"<div><p>This paper presents an experimental investigation examining the novel idea of employing curved expanded-Polystyrene (EPS) blocks that arch around the upper section of buried flexible pipes to reduce the pressures acting on them and hence resulting deformation/deflections. Large-scale testing was performed to examine key performance indicators for reinstated trenches with buried 250-mm diameter plastic pipe (0.75-m invert depth) when subjected to cyclic surface loading simulating vehicular traffic. The real-scale model tests investigated unreinforced and geocell-reinforced trenches with conventional rectangular and differently shaped EPS block inclusions placed above the crown or fitting snugly around the upper section of the buried pipes. Compared to conventional rectangular EPS block, the curved-arched EPS block produced greater reductions in the pressures acting on the buried pipes, resulting in substantially smaller pipe deformation/deflections. The geocell layer overlying the EPS block significantly reduced the pressures bearing on the highly compressible EPS material, thereby reducing its compression and the trench surface settlement. Optimum trench reinstatements incorporated both the geocell layer and a 75-mm thick curved-arched EPS block fitted around the top section of the pipe. Doubling the EPS block thickness produced only modest reductions in the pipe deflections, but significantly increased the trench surface settlement.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"52 4","pages":"Pages 671-689"},"PeriodicalIF":5.2,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140406999","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

Introduction to a novel geotextile tube connection construction method: A case study of test site and field application 新型土工织物管连接施工方法介绍：试验场和实地应用案例研究

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-03-27 DOI: 10.1016/j.geotexmem.2024.03.005

Hyeong-Joo Kim , Myoung-Soo Won , Shamsher Sadiq , Tae-Woong Park , Hyeong-Soo Kim , Young-Soung Jeong , Jun-Yong Park , Tae-Eon Kim

引用次数: 0

Experimental investigation of the geometry of geocell on the performance of flexible pavement under repeated loading 土工格室的几何形状对重复荷载下柔性路面性能的实验研究

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-03-27 DOI: 10.1016/j.geotexmem.2024.03.007

Sayanti Banerjee, Bappaditya Manna, J.T. Shahu

{"title":"Experimental investigation of the geometry of geocell on the performance of flexible pavement under repeated loading","authors":"Sayanti Banerjee, Bappaditya Manna, J.T. Shahu","doi":"10.1016/j.geotexmem.2024.03.007","DOIUrl":"10.1016/j.geotexmem.2024.03.007","url":null,"abstract":"<div><p>To evaluate the benefit of geocells of different geometrical configurations for pavement application, full-scale instrumented model tests were performed on pavement sections reinforced with geocells of different geometrical configurations subjected to monotonic and repeated loading. The responses studied were stress distribution in different pavement layers, induced strains in geocell walls, and settlement characteristics. The reinforced sections exhibited a significant reduction in rut depth as well as localized stress concentration compared to the unreinforced section. The reduction in rut depth was found to be influenced by the geocell height as well as weld spacing. The geocell reinforcement was found to distribute the stresses in the subgrade and subbase layers more efficiently, thus reducing the stress concentration in these layers. The strain measurements were found to be higher at the bottom of the geocell walls indicating a higher confinement effect on a lower part of the geocell. In the field, mostly geocells of 356 mm weld spacing and 150 mm height (SW356-H150) are used. However, this study suggests that a geocell of 330 mm weld spacing and 100 mm height (SW330-H100) having approximately 30% lower cost compared to SW356-H150 is as effective in reducing the rut depth and localized vertical stress distribution.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"52 4","pages":"Pages 654-670"},"PeriodicalIF":5.2,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140399379","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

Seismic bearing capacity of strip footings placed on reinforced soil slopes using slip line method 采用滑移线法计算加固土坡上条形基脚的抗震承载力

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-03-15 DOI: 10.1016/j.geotexmem.2024.03.004

Majd Tarraf, Ehsan Seyedi Hosseininia

{"title":"Seismic bearing capacity of strip footings placed on reinforced soil slopes using slip line method","authors":"Majd Tarraf, Ehsan Seyedi Hosseininia","doi":"10.1016/j.geotexmem.2024.03.004","DOIUrl":"10.1016/j.geotexmem.2024.03.004","url":null,"abstract":"<div><p>This study investigates the seismic vertical bearing capacity of strip footings positioned on reinforced soil structures employing a two-phase approach and the slip line method. The investigation aims to establish a slip line field and determine the critical slip surface without any assumptions of predefined surfaces. The obtained results are compared with previous studies, demonstrating a good agreement and validating the accuracy of the proposed approach. The variation of the bearing capacity factor with the horizontal seismic coefficient, soil internal friction angle, setback distance normalized by footing width, and slope incline angle. An increase in the horizontal seismic coefficient leads to a decrease in bearing capacity factor, while an increase in the soil internal friction angle has the opposite effect. The influence of the setback distance on the bearing capacity is also examined, highlighting significant improvements with increased setback distances. Additionally, the study investigates the impact of the tensile strength ratio and setback distance on the ultimate bearing capacity factor and the bearing capacity ratio. The distribution of reinforcement forces beneath the footing is analyzed and presented through contour plots, providing valuable insights into the seismic behavior of footings on reinforced soil slopes.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"52 4","pages":"Pages 612-625"},"PeriodicalIF":5.2,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140146218","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

Experimental evaluation of geosynthetic-modular block connection loads 土工合成材料与模块砌块连接荷载的实验评估

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-03-13 DOI: 10.1016/j.geotexmem.2024.03.001

F.H.M. Portelinha , P.V.C. Figueiredo , J.G. Zornberg

{"title":"Experimental evaluation of geosynthetic-modular block connection loads","authors":"F.H.M. Portelinha , P.V.C. Figueiredo , J.G. Zornberg","doi":"10.1016/j.geotexmem.2024.03.001","DOIUrl":"10.1016/j.geotexmem.2024.03.001","url":null,"abstract":"<div><p>The design of segmental geosynthetic mechanically stabilized walls with masonry block facing is often governed by the loads that develop at the connection between the facing and geosynthetic. Yet the current understanding of the mechanisms involved in the mobilization of such connection loads is, at best, incomplete. The testing apparatus developed as part of this study facilitates simulating the transference of stresses at the face and evaluating the facing connection loads in geosynthetic-reinforced soil walls. This study assesses the connection loads between a geogrid reinforcement connected frictionally to modular concrete blocks. A comprehensive instrumentation program was implemented to capture lateral earth pressures, geosynthetic strains and loads acting at the geogrid-block connection in a geosynthetic-reinforced unit cell subjected to incremental surcharge stages. Results indicate that conventional calculations, based on earth pressure theory, may underestimate the facing connection loads, mainly when the connection loads are triggered by the differential settlement of the backfill relative to the block facing. When this mechanism dominates the mobilization at the connection, reinforcement loads increase as the differential settlement increases, developing down-drag forces at the connection between the geogrid and modular blocks.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"52 4","pages":"Pages 574-584"},"PeriodicalIF":5.2,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140146223","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

Electroosmosis of gold tailings under multiple electrokinetic geosynthetics electrodes 金尾矿在多电动力土工合成材料电极下的电渗作用

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-03-12 DOI: 10.1016/j.geotexmem.2024.03.002

Changbo Du , Ben Niu , Fu Yi , Meng Wang , Xinqi Jiang

{"title":"Electroosmosis of gold tailings under multiple electrokinetic geosynthetics electrodes","authors":"Changbo Du , Ben Niu , Fu Yi , Meng Wang , Xinqi Jiang","doi":"10.1016/j.geotexmem.2024.03.002","DOIUrl":"10.1016/j.geotexmem.2024.03.002","url":null,"abstract":"<div><p>In dry-stack tailing ponds with high fine-grained content, a high long-term saturation line can lead to dam failure. Electroosmotic consolidation is an effective method for reducing dam saturation lines. However, traditional electrodes have low corrosion resistance and poor contact, which limits the development of electroosmotic drainage technology for tailings. In this study, an electroosmotic drainage device, an electrokinetic geosynthetic (EKG) electrode, was designed. The influence law of the electrode material, potential gradient, and number of electrodes on the water drainage, current, and resistance was analyzed. The results show that the EKG electrode has excellent corrosion resistance, with its weight loss after electroosmosis, water drainage, and equivalent allowable current being 1.67%, 122%, and ∼2.3 times that of a copper electrode, respectively. Furthermore, it was found that the optimal potential gradient was 1.2 V/cm, and the water drainage cannot be improved by an exceedingly high potential gradient. The current pathway in the test box was in parallel, and the water drainage increased to 410% and the contact resistance decreased by 83% when the number of electrodes was four. These results and novel methodology provide new ideas for EKG electrode design and represent an effective method for saturation line control in gold tailing ponds.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"52 4","pages":"Pages 585-597"},"PeriodicalIF":5.2,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140146221","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

Mechanism of air-boosting and its effects on vacuum consolidation 增气机制及其对真空固结的影响

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-02-27 DOI: 10.1016/j.geotexmem.2024.02.002

Jinchun Chai , Yafei Qiao , Wenqi Ding , Hehua Zhu

引用次数: 0

Enhanced drainage performance of PVF-wicking geosynthetics: Development and experimental assessment 增强 PVF 吸水土工合成材料的排水性能：开发与实验评估

IF 5.2 1区工程技术

Geotextiles and Geomembranes Pub Date : 2024-02-24 DOI: 10.1016/j.geotexmem.2024.02.003

Xiaohui Sun , Ziyi Chen , Fan Chen , Silin Wu , Wuyu Zhang , Yuansheng Peng , Guilin Chen

{"title":"Enhanced drainage performance of PVF-wicking geosynthetics: Development and experimental assessment","authors":"Xiaohui Sun , Ziyi Chen , Fan Chen , Silin Wu , Wuyu Zhang , Yuansheng Peng , Guilin Chen","doi":"10.1016/j.geotexmem.2024.02.003","DOIUrl":"10.1016/j.geotexmem.2024.02.003","url":null,"abstract":"<div><p>An enhanced geosynthetic material, PVF-wicking geosynthetic (PWG), was developed to improve the performance of the wicking geosynthetic product family, e.g., the wicking geotextile (WG). The PWG was made by coating deep-grooved wicking yarns and reinforcement with the layered polyvinyl alcohol formaldehyde (PVF) high-absorbent materials. The drainage performance of PWG was assessed through beaker drainage tests and soil column tests. The results of the beaker drainage test and SEM images indicate that PVF does not obstruct the deep-grooved yarns. It is found that, by facilitating efficient water absorption, storage, and transfer as a transit layer between the subgrade and wicking yarns, PVF plays a crucial role in enhancing the drainage capabilities of the geosynthetic material. PWG outperforms WG in terms of drainage efficiency under both static and cyclic loading conditions. The mechanism of the drainage improvement by PWG under cyclic loading is that the excess pore pressure within the PVF layer accelerates the water transfer from the pores of the PVF into the grooves of yarns. PWG, included with reinforcement, exhibited comparable interface characteristics to WG, with the potential to meet the requirements of soil stabilization. The remarkable drainage efficiency of PWG underscores its potential for practical applications.</p></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"52 4","pages":"Pages 562-573"},"PeriodicalIF":5.2,"publicationDate":"2024-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139981399","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