Geosynthetics International最新文献_第2页

Observations on tensile testing of intact and slitted geotextiles through image analysis 通过图像分析观察完整土工织物和缝合土工织物的拉伸试验

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2024-01-10 DOI: 10.1680/jgein.23.00113

Chetan Bambhaniya, J. Chavda, Jignesh B. Patel

{"title":"Observations on tensile testing of intact and slitted geotextiles through image analysis","authors":"Chetan Bambhaniya, J. Chavda, Jignesh B. Patel","doi":"10.1680/jgein.23.00113","DOIUrl":"https://doi.org/10.1680/jgein.23.00113","url":null,"abstract":"Geotextiles are widely used as reinforcing elements in many geotechnical engineering applications such as mechanically stabilized earth walls, reinforced soil slopes, capping of high-water content clays in landfills, reinforced embankments for railways and roadways, etc. The ultimate strength of geotextile is obtained from the load-displacement plot; however, the failure mechanism evaluation of local displacement is crucial to understand the serviceability state. In the present study, the image-based deformation measurement technique is used to evaluate the local displacement within geotextile at different locations during the wide-width tensile test. Further, the load-displacement plots are obtained for different geotextiles and a comparison is made between the measured displacements from the instruments and through an image-based deformation measurement technique. Additionally, the strength of geotextiles with imbibed defects at different orientations and corresponding failure patterns is investigated. The imbibed defect in geotextile is in the form of slits having orientations varied as vertical, horizontal, and inclined with respect to the loading direction. It has been observed that geotextile with vertical slit has the highest strength, followed by geotextile with inclined and horizontal slits. The present study results provide insight into the variation in the strength and displacement field of geotextiles having defects.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"73 8","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139440560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Influence of roots on the hydro-mechanical performance of a drainage geocomposite 根系对排水土工复合材料水力机械性能的影响

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2024-01-10 DOI: 10.1680/jgein.23.00105

A. Amato, F. Cafaro, D. Cazzuffi, P. Recalcati

{"title":"Influence of roots on the hydro-mechanical performance of a drainage geocomposite","authors":"A. Amato, F. Cafaro, D. Cazzuffi, P. Recalcati","doi":"10.1680/jgein.23.00105","DOIUrl":"https://doi.org/10.1680/jgein.23.00105","url":null,"abstract":"Geosynthetics are increasingly used in geotechnical works in association with vegetation, whose function has been typically considered as an improvement for the works themselves, especially due to the mechanical and hydraulic effects the root system provides. Within this context, the paper presents an experimental study performed to evaluate the long-term performance of geosynthetics, specifically drainage geocomposites, exposed to the influence of roots. Two species of plant were selected for their fast-growing and pervasive roots, Vetiver and Bamboo, and planted in a thin layer of growing medium, which buried the geosynthetic specimens. After a period of plant growth, the specimens affected by roots (“rooted specimens”) were exhumed, and submitted to tensile and drainage capacity laboratory tests, to determine their mechanical and hydraulic behaviour. The laboratory test results were compared with those obtained on virgin specimens of drainage geocomposite, under undisturbed conditions (“reference specimens”). The results show a decrease in drainage capacity for rooted specimens, more pronounced in the case of the highest density of roots into the drainage core. Concerning the tensile behaviour, no significant variations emerged in rooted specimens, although a slight increase in tensile strength, together with a modest decrease in elongation at maximum load, could be observed.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"55 5","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139441129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Behavior of back-to-back mechanically stabilized earth walls as railway embankments 作为铁路路堤的背靠背机械稳定土墙的特性

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2024-01-10 DOI: 10.1680/jgein.23.00126

M. Yazdandoust, F. Daftari

{"title":"Behavior of back-to-back mechanically stabilized earth walls as railway embankments","authors":"M. Yazdandoust, F. Daftari","doi":"10.1680/jgein.23.00126","DOIUrl":"https://doi.org/10.1680/jgein.23.00126","url":null,"abstract":"Twelves physical model tests were carried out to investigate the role of the type and arrangement of reinforcements on the behavior of back-to-back mechanically stabilized earth walls (BBMSEWs) supporting railway tracks. Six metal-strip reinforced BBMSEW models and six geogrid reinforced models were prepared with different reinforcement arrangements and then were vertically loaded to failure using wooden railway sleepers. The findings indicated that the reinforcement stiffness played a more prominent role in improving the bearing capacity than the pull-out capacity. The connection of two opposing walls with continuous reinforcements and the complete separation of them from each other were found to be the best and worst reinforcement arrangements. respectively, for improving the bearing capacity and reducing wall deformation in BBMSEWs. The respective use of these two arrangements mobilized the maximum and minimum forces in the reinforcements. Moreover, the creation of a proper connection between the opposing walls using continuous inextensible reinforcements or those with a sufficient overlap lengths were found to be efficient solutions to preventing the propagation of a failure plane across the back-to-back MSE walls.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"16 5","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139439118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effect of oxidative ageing on stiffness improvement factor for HDPE and PET geogrids 氧化老化对HDPE和PET土工格栅刚度提高因子的影响

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-11-22 DOI: 10.1680/jgein.23.00089

M. S. Morsy, A. M. Elhanafy, S. S. Fathelbab, S. M. Ahmed

{"title":"Effect of oxidative ageing on stiffness improvement factor for HDPE and PET geogrids","authors":"M. S. Morsy, A. M. Elhanafy, S. S. Fathelbab, S. M. Ahmed","doi":"10.1680/jgein.23.00089","DOIUrl":"https://doi.org/10.1680/jgein.23.00089","url":null,"abstract":"The effect of thermal-oxidative ageing on the in-isolation and in-soil stiffness is investigated for two high-density polyethylene (HDPE) and two polyester (PET) geogrids when incubated in an oven at 90oC. It is shown that the in-isolation and in-soil stiffness of three out of the four geogrids decreased during the 4-month ageing time with a faster degradation of the two PET geogrids. In contrast, one of the HDPE geogrids examined with thicker rib shows slower degradation compared to the PET counterparts. It is also shown that a geogrid might have a higher unaged stiffness, but less aged stiffness compared to another geogrid made of the same polymer type. It is suggested that the ageing approach used in this study could be adopted for selection of geogrids based on their long-term stiffness for structures such as reinforced embankments or mechanically stabilized earth walls that require a long service life. Moreover, results indicate that the stiffness improvement factor for the PET geogrids decreases with ageing time. On the contrary, the stiffness improvement factor of the HDPE geogrid increases with time and hypothetically might keep increasing followed by a sudden drop to zero at full degradation of the geogrid.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"577 ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Equivalent analytical models for assessment of landfill composite liners 垃圾填埋场复合衬垫的等效分析模型

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-11-21 DOI: 10.1680/jgein.23.00117

H. Xie, W. Xu, L. Wang, H. Yan, J. Wu

{"title":"Equivalent analytical models for assessment of landfill composite liners","authors":"H. Xie, W. Xu, L. Wang, H. Yan, J. Wu","doi":"10.1680/jgein.23.00117","DOIUrl":"https://doi.org/10.1680/jgein.23.00117","url":null,"abstract":"In order to efficiently estimate the properties of landfill composite liners, equivalent analytical models based on time moment are proposed. The service performance of geomembrane layer (GMBL)/geosynthetic clay layer (GCL)/attenuation layer (AL) and GMBL/compacted clay layer (CCL)/AL are equivalent analyzed. The equivalent analysis and quantitative correlation of contaminants at the bottom of GMBL/GCL/AL and GMBL/CCL/AL are considered according to relative concentration (CN), instantaneous flux (JI) and accumulative flux (JA). We showed that CN is the most conservative equivalent index. The thickness equivalent relation of AL for different composite liners is consequently obtained using the pure diffusion equivalent model and the advection-diffusion equivalent model, respectively. It is found that the pure diffusion thickness equivalent relationship was a simplified linear correlation and time independent. The quadratic polynomial equivalent equations of AL thickness for different service time are obtained by group method of data handling approach (GMDH). The results show that GCL composite liner has better environmental protection performance than CCL composite liner. When the thickness of GMBL/CCL/AL composite liner is fixed, the corresponding equivalent thickness of AL in GMBL/GCL/AL composite liner decreased with the rise of leachate head and wrinkle length for the same value of CN.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"606 ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Combined bearing capacity of footings on geogrid-reinforced granular fill over soft clay 软粘土上土工格栅加筋颗粒填料地基组合承载力研究

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-11-20 DOI: 10.1680/jgein.23.00049

M. Fatehi, B. Yaghoobi, M. Payan, I. Hosseinpour, R. Jamshidi Chenari

{"title":"Combined bearing capacity of footings on geogrid-reinforced granular fill over soft clay","authors":"M. Fatehi, B. Yaghoobi, M. Payan, I. Hosseinpour, R. Jamshidi Chenari","doi":"10.1680/jgein.23.00049","DOIUrl":"https://doi.org/10.1680/jgein.23.00049","url":null,"abstract":"The current study investigates the ultimate bearing capacity of obliquely/eccentrically loaded shallow strip foundations resting on a geogrid-reinforced granular fill with limited thickness over a very soft to soft clay layer. To this end, the lower bound theorems of the finite element limit analysis (FELA) and second-order cone programming (SOCP) are effectively exploited to simulate the underlying clay deposit, geogrid layer, and granular fill along with the inclined/eccentric loading exerted on the overlying footing. The accuracy of the adopted formulations was rigorously examined through several comparisons with the results of a well-established analytical approach in the literature. A comprehensive parametric study is then conducted to properly examine the influences of the geosynthetic layer characteristics and soft clay properties on the overall bearing capacity and failure envelope of the strip footing subjected to wide ranges of inclined and eccentric combined loadings. The results show that placement of a geogrid-reinforced granular fill layer over the soft clayey soil significantly increases the bearing capacity of the shallow foundation. The ultimate tensile strength of the reinforcement layer and the cohesion of the underlying very soft to soft clay deposit were also observed to have considerable effects on the size of failure envelopes.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"618 ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Study on performance of geocell-reinforced red clay subgrade 土工格室加筋红粘土路基性能研究

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-11-17 DOI: 10.1680/jgein.23.00068

X. W. Luo, Z. Lu, J. B. Zhang, H. L. Yao

{"title":"Study on performance of geocell-reinforced red clay subgrade","authors":"X. W. Luo, Z. Lu, J. B. Zhang, H. L. Yao","doi":"10.1680/jgein.23.00068","DOIUrl":"https://doi.org/10.1680/jgein.23.00068","url":null,"abstract":"Three comparative treatment plans are used in red clay subgrade, in order to research the effect of red clay subgrade reinforced with geocell. Multiple subgrade test methods including Benkelman beam, portable falling weight deflectometer, dynamic cone penetrometer and standard vehicle load tests are adopted in the field tests. Test results show that the application of geocell in red clay subgrade can enhance the overall stiffness and strength of the subgrade. The mechanism of geocell in the subgrade is studied. Geocell can provid added confinement on the surbgrade soil.Compared with the red clay subgrade without geocell-reinforcement, the rebound modulus of the red clay subgrade reinforced with 0.1-m-height geocell and 0.05-m-height geocell show a 65% and 33% increase, the dynamic modulus increase by 69% and 38% and the penetrations decrease by 51.7% and 40.4%, respectively. A hard shell layer is formed in the subgrade, after the surbgrade is reinforced with the geocell. Geocell reinforced layer plays mainly the role of stress diffusion. It not only can reduce the additional stress in the subgrade, but also can diminish the influence depth of the vehicle load.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"609 ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Response of sensor-enabled piezoelectric geobelt reinforced soil pullout friction signals 传感器驱动的压电带加筋土拉出摩擦信号响应

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-11-16 DOI: 10.1680/jgein.23.00108

Y. Rao, Z. Liu, G. Ding, J. Wang, H. Wang, X. Wu, Z. Gao

{"title":"Response of sensor-enabled piezoelectric geobelt reinforced soil pullout friction signals","authors":"Y. Rao, Z. Liu, G. Ding, J. Wang, H. Wang, X. Wu, Z. Gao","doi":"10.1680/jgein.23.00108","DOIUrl":"https://doi.org/10.1680/jgein.23.00108","url":null,"abstract":"Geosynthetics are widely used in soil reinforcement engineering, where the failure modes of geosynthetics are typically pullout modes. However, current research on monitoring the pullout damage experienced by reinforced soil is limited. Accordingly, this study tested the stress variation laws and signal output characteristics of a sensor-enabled piezoelectric geobelt (SPGB) that can capture the tensile vibration signals of reinforced soil under various tensile failure conditions. We observed that the SPGB captures the response signals under different soil environments, confining pressures, and shear rates. During the pullout friction process, a spike is generated, and the displacement corresponding to the position of the spike will increase with the increase of the pullout friction rate. In the clay environment, the spike voltage is related to the confining pressure, while in the sand environment, there is no obvious relationship between the spike voltage and the confining pressure. In the gravel environment, the output voltage of SPGB fluctuates greatly, due to the embedment of gravel particles, and many negative voltages with large amplitude appeared. This study verified the promising application potential of the SPGB for the integration of soil reinforcement and monitoring, which is significant for further application of SPGB in engineering.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"603 ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Semi-analytical model for axisymmetric transport of contaminant through flawed geomembrane 污染物通过有缺陷土工膜轴对称运移的半解析模型

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-11-15 DOI: 10.1680/jgein.23.00091

T. Li, D. Sun, P. Ni, Z. Chen, L. Wang

{"title":"Semi-analytical model for axisymmetric transport of contaminant through flawed geomembrane","authors":"T. Li, D. Sun, P. Ni, Z. Chen, L. Wang","doi":"10.1680/jgein.23.00091","DOIUrl":"https://doi.org/10.1680/jgein.23.00091","url":null,"abstract":"Geomembrane (GM) is a kind of cost-efficient material for pollutant barrier in landfills, while defects can occur during the installation or service periods, resulting in a mixed-type boundary condition (MTBC) at the top surface of underlying soil layer (SL). In this study, a novel boundary transform method is employed to handle the MTBC problem of axisymmetric transport of organic contaminant through defected GM, and a semi-analytical solution is derived to evaluate the concentration profiles in the spatiotemporal domain. The proposed solution is in the cylindrical coordinates that can incorporate the diffusion and dispersion processes, as well as the concentration condition in the GM defect. The discretization method, integral transforms and corresponding inverse transforms are applied to obtain the semi-analytical solution, which is demonstrated effective compared to the numerical results. The model is applied to predict the migration characteristics of organic contaminant in several cases, followed by discussions to evaluate the influencing roles of defect rate, anisotropic coefficient, and segment number. Results indicate that the existence of defects substantially reduces the barrier capacity of the GM layer, and the contaminant migration time varies in several orders of magnitude for different MTBCs.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"591 ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Evaluating stability of rigid column-supported and geosynthetic-reinforced embankments 刚性柱支土工合成筋路堤稳定性评价

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-11-15 DOI: 10.1680/jgein.23.00070

H. Liu, Q. Luo, M. H. El Naggar, K. Liu, T. Wang

{"title":"Evaluating stability of rigid column-supported and geosynthetic-reinforced embankments","authors":"H. Liu, Q. Luo, M. H. El Naggar, K. Liu, T. Wang","doi":"10.1680/jgein.23.00070","DOIUrl":"https://doi.org/10.1680/jgein.23.00070","url":null,"abstract":"Field observations and centrifuge tests indicate that progressive column bending failure accompanies most instabilities of rigid column-supported and geosynthetic-reinforced (RCGR) embankments. However, recognized guidelines specifically for evaluating the overall stability of such systems featuring bending failure remain limited. This study presents a general methodology to calculate the factor of safety (FS) for RCGR embankments using the limit equilibrium method. The focus is on deep-seated slope failures, wherein rigid columns progressively fracture due to subsoil overstressing. The Concentric Arches model, along with tensioned geosynthetic analysis, informs the determination of vertical and horizontal loads on the column heads. The column's resisting moment stems from its flexural and compression resistance. A mobilization factor for the net thrust on each column is defined to capture the progressive failure. The methodology involves an iterative computational procedure to identify the critical slip surface and the FS utilising Fellenius’ method. The solution is validated against three case studies, including both centrifuge models and field tests, as well as finite element analysis. The results indicate that the soil mass contributes the most to resisting sliding and overall stability, followed by the columns and geosynthetics. In addition, axial force mainly provides the resisting moment of columns.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"602 ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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