Geosynthetics International最新文献_第3页

Extrapolating residual GMX/GDC interface strength from direct shear tests 从直剪试验推断残余GMX/GDC界面强度

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-11-15 DOI: 10.1680/jgein.23.00111

J. Lin, T. D. Stark, A. Idries

{"title":"Extrapolating residual GMX/GDC interface strength from direct shear tests","authors":"J. Lin, T. D. Stark, A. Idries","doi":"10.1680/jgein.23.00111","DOIUrl":"https://doi.org/10.1680/jgein.23.00111","url":null,"abstract":"The residual interface strength is mobilized along sideslopes of geosynthetic lined areas, such as landfill sideslope. Unfortunately, only a large displacement (LD) interface strength is measured in frequently used direct shear tests, which overpredicts the residual interface strength by about 40% because of limited continuous shear displacement and new geomembrane being introduced during the test. Commercial laboratories usually conduct direct shear tests in accordance with ASTM D5321 or D6243, which can only measure the LD interface strength. This paper suggests a method to estimate the residual interface strength from direct shear test results, which provides a better estimate of field interface strengths. The shear stress-displacement relationship from ring shear tests fits a power function, which can be used to extrapolate direct shear test results to a residual strength. This paper shows the power function can predict reasonable residual interface strengths from the shear stress-displacement relationship measured in direct shear tests. This method allows people to estimate the residual strength data when only direct shear test results are available and prevents overprediction of the Factor of Safety (FoS) during slope stability evaluations.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"464 ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515170","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

Investigation on dynamic performance of soilbag cushion using shaking table tests 用振动台试验研究土袋垫的动力性能

2区工程技术

Geosynthetics International Pub Date : 2023-11-09 DOI: 10.1680/jgein.23.00074

B. Fang, S. Liu, Y. Lu, S. Chen, Y. Zhang, C. Zhang, C. Zhang

{"title":"Investigation on dynamic performance of soilbag cushion using shaking table tests","authors":"B. Fang, S. Liu, Y. Lu, S. Chen, Y. Zhang, C. Zhang, C. Zhang","doi":"10.1680/jgein.23.00074","DOIUrl":"https://doi.org/10.1680/jgein.23.00074","url":null,"abstract":"Soilbag cushion is one of the promising base isolation methods to reduce seismic energy transfer from ground to building structure. In this study, a series of shaking table tests were conducted comparatively on foundation models with soilbag cushion and sand cushion to evaluate their dynamic performance. The test results indicate that soilbag cushion could significantly reduce acceleration response and accumulated settlement compared to sand cushion. And the relatively smaller amplitude of dynamic lateral earth pressure measured on contact surface of soilbags within soilbag cushion also indicates its stability during oscillation. The advantages of soilbag cushion for energy dissipation and damping are more easily highlighted under the condition of high-acceleration, high-frequency or high uniformly distributed load. The dynamic performance of soilbag cushion is dependent on embedded depth and thickness. It is most effective for soilbag cushion to be arranged near the rigid footing of building structures; it is suggested that the number of layers of soilbag cushion be controlled on the premise of the designed ratio of the thickness to the width of soilbag cushion ranging from 0.125 to 0.4 for low- or middle-rise masonry buildings in practical engineering.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":" 49","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135190996","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

Durability of geogrid in a sloped reinforced soil wall after 25 years in-service 斜面加筋土墙土工格栅服役25年后耐久性分析

2区工程技术

Geosynthetics International Pub Date : 2023-10-18 DOI: 10.1680/jgein.22.00359

V. S. Quinteros, R. J. Fannin

引用次数: 0

Assessment of the stress crack resistance of multilayered textured HDPE geomembranes 多层织构HDPE土工膜抗应力开裂性能评价

2区工程技术

Geosynthetics International Pub Date : 2023-10-18 DOI: 10.1680/jgein.23.00096

F. B. Abdelaal, M. Zafari, R. K. Rowe

{"title":"Assessment of the stress crack resistance of multilayered textured HDPE geomembranes","authors":"F. B. Abdelaal, M. Zafari, R. K. Rowe","doi":"10.1680/jgein.23.00096","DOIUrl":"https://doi.org/10.1680/jgein.23.00096","url":null,"abstract":"The stress crack resistance (SCR) of different multilayered textured geomembranes (GMBs) immersed in synthetic municipal solid waste leachate at 55°C and 85°C for 50 months was assessed using their smooth edge or smooth equivalent GMBs made from the same formulation as textured GMBs. The difference between the actual thickness of the smooth edge and the nominal thickness of the GMB was shown to result in SCR values that do not reflect the true SCR of the GMB resin when assessed based on the current ASTM standard test procedure. As such, adjustments to the current test method are presented to limit its effect on SCR, especially when comparing the performance of different GMBs based on SCR. Additionally, due to variations in formulation and thickness of the textured and smooth portions of GMB rolls, a new double-notching technique was examined to assess the SCR of the textured portion. Using this technique on samples from textured and smooth portions at different incubation times showed similar initial and stabilised SCR values but different SCR degradation rates for the two different parts of the same GMB roll. Relying solely on SCR values obtained from the smooth edge/smooth equivalent GMB may thus underestimate or overestimate the degradation of multilayered textured GMBs.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824162","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

Modular polymer stormwater collection structure response to one-week design truck load 模块化聚合物雨水收集结构对一周设计卡车荷载的响应

2区工程技术

Geosynthetics International Pub Date : 2023-10-09 DOI: 10.1680/jgein.23.00095

R. W. I. Brachman, A. Zarpeima, J. M. LeBlanc

{"title":"Modular polymer stormwater collection structure response to one-week design truck load","authors":"R. W. I. Brachman, A. Zarpeima, J. M. LeBlanc","doi":"10.1680/jgein.23.00095","DOIUrl":"https://doi.org/10.1680/jgein.23.00095","url":null,"abstract":"Full-scale physical modelling is used to evaluate the response of modular polymer stormwater collection structures when subjected to design-truck loading that was sustained for one week (i.e. a parked vehicle) and when buried with minimum soil cover. Surface loading was applied on a steel load pad that simulates one-half of the AASHTO design-truck single-axle that was held constant for 1 week to assess the stability of the buried system and demand on the platen and column components of the modules to allow independent load rating of the buried structure. No collapse or limiting state occurred. The 1-week creep buckling resistance was found to be nearly 4 times the factored column demand to 1-week loading for both module types. New insight on time dependent behaviour of the soil-structure system was gained by comparing the buried response to creep tests conducted on isolated columns and platens. The response of the buried soil-structure system was less severe than unconstrained creep. Column loads were found to not increase with time. Bending deflections increased by 1.04 to 1.26 times when buried rather than by 3.0 to 3.4 times for unconstrained creep as platen creep when buried was greatly restrained by the soil.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135095191","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

Best Geosynthetics International Paper for 2022 2022年最佳国际土工合成论文奖

2区工程技术

Geosynthetics International Pub Date : 2023-10-01 DOI: 10.1680/jgein.2023.30.5.449

R. J. Bathurst

引用次数: 0

Dynamic properties of frozen rubber-reinforced expansive soils under confining pressure 围压作用下冻结橡胶加固膨胀土动力特性研究

2区工程技术

Geosynthetics International Pub Date : 2023-09-20 DOI: 10.1680/jgein.23.00044

Z. Yang, Z. Cheng, Y. Cui, X. Ling, W. Shi

{"title":"Dynamic properties of frozen rubber-reinforced expansive soils under confining pressure","authors":"Z. Yang, Z. Cheng, Y. Cui, X. Ling, W. Shi","doi":"10.1680/jgein.23.00044","DOIUrl":"https://doi.org/10.1680/jgein.23.00044","url":null,"abstract":"In recent years, waste rubber has been increasingly utilized to enhance the performance of expansive soil foundations. This study aims to investigate the influence of rubber powder on the dynamic characteristics of frozen rubber-reinforced expansive soils (RRES) in permafrost regions. Temperature-controlled dynamic triaxial tests were conducted on RRES samples, varying rubber content, freezing temperatures, and confining pressures. The key findings are as follows: (1) A modified Hardin model with freezing temperature and rubber content as correction factors was established, which was verified to be useful for describing the dynamic stress-strain relationship. (2) Under the confining pressure, the dynamic shear modulus decreases with increasing rubber content. When the rubber content changes from 5% to 10%, the dynamic shear modulus decreases by about 20 MPa; the change becomes less obvious after the content exceeds 20%, and the RRES tends to show the characteristics of rubber. (3) As the rubber content increases, the damping ratio rises and shows the phenomenon of increasing and then decreasing with increasing confining pressure, and reaching a maximum at 0.4 MPa; (4) A prediction model for the maximum dynamic shear modulus with rubber content, freezing temperature and confining pressure is proposed.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136312812","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

Probabilistic analysis for the reinforced fill over void problem 加筋填空问题的概率分析

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-09-04 DOI: 10.1680/jgein.23.00067

R. Bathurst, F. M. Naftchali

{"title":"Probabilistic analysis for the reinforced fill over void problem","authors":"R. Bathurst, F. M. Naftchali","doi":"10.1680/jgein.23.00067","DOIUrl":"https://doi.org/10.1680/jgein.23.00067","url":null,"abstract":"Analytical and numerical solutions for the problem of geosynthetic reinforced fills over a void have been the subject of investigation for the last four decades. A common feature of this prior work is that all methods have treated the analytical solutions as deterministic. While the treatment of some input parameters must be taken as deterministic, there are other parameters that have uncertainty. Furthermore, the underlying mechanistic models for load and resistance terms in the limit state equations for the reinforced fill over a void problem can be expected to have different accuracy. This paper revisits the problem of geosynthetic reinforced fills over voids from a probabilistic point of view for reinforcement tensile strain, tensile strength and geosynthetic stiffness limit states. Particular attention is paid to the method used to select the isochronous stiffness of the reinforcement and the associated uncertainty in the magnitude of that value. The paper demonstrates how the factor of safety from deterministic past practice can be linked quantitatively to reliability index used in contemporary probabilistic design. Finally, the paper demonstrates the advantage of using product-specific constant-load creep test results to maximise margins of safety for strength and stiffness limit states in both deterministic and probabilistic frameworks.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":" ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49193038","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

Filtration behaviour of staple fibre geotextiles under unequal biaxial tensile strains 短纤维土工织物在不等双轴拉伸应变下的过滤性能

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-09-04 DOI: 10.1680/jgein.23.00056

L. Tang, W. Francey, J. Zheng, X. Wang, X. Luo

{"title":"Filtration behaviour of staple fibre geotextiles under unequal biaxial tensile strains","authors":"L. Tang, W. Francey, J. Zheng, X. Wang, X. Luo","doi":"10.1680/jgein.23.00056","DOIUrl":"https://doi.org/10.1680/jgein.23.00056","url":null,"abstract":"Gradient ratio tests were conducted to investigate the filtration behaviour of staple fibre needle-punched nonwoven geotextiles subjected to unequal biaxial tensile strains. Three groups of biaxial tensile strains were designed, with the ratios of the strain in the machine direction to that in the cross-machine direction set to 1, 2, and 4, respectively. The strains in the machine direction in the three groups were the same, ranging from 10% to 30%. The tested filtration properties included the gradient ratio (GR), permeability of the soil-geotextile system, mass of soil loss, and permittivity of the pure geotextiles. Comparisons were made between the filtration properties of staple fibre (SN) geotextiles and continuous filament (CN) geotextiles. It is shown that for a certain strain ratio, the GR value at the time of test termination increases with increasing strain, and the permeability of the soil-geotextile system, soil loss, and permittivity of the pure geotextiles decrease with increasing strain. The soil loss and permittivity under equal biaxial tensile strains tend to be higher than those under unequal biaxial tensile strains. The CN geotextiles have better retention capability and more clogging potential for the tested soils than the SN geotextiles for a similar mass per unit area.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":" ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44792657","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

Modeling geogrid-stabilized aggregate base courses considering local stiffness enhancement 考虑局部刚度增强的土工格栅稳定骨料基层建模

IF 4.5 2区工程技术

Geosynthetics International Pub Date : 2023-09-01 DOI: 10.1680/jgein.23.00086

Y.-H. Byun, I. Qamhia, M. Kang, E. Tutumluer, M. H. Wayne

{"title":"Modeling geogrid-stabilized aggregate base courses considering local stiffness enhancement","authors":"Y.-H. Byun, I. Qamhia, M. Kang, E. Tutumluer, M. H. Wayne","doi":"10.1680/jgein.23.00086","DOIUrl":"https://doi.org/10.1680/jgein.23.00086","url":null,"abstract":"Lateral restraint is the primary stabilization mechanism associated with the interlocking of aggregate particles in the geogrid apertures. This paper presents findings from a laboratory study which quantifies the local stiffness enhancement of aggregates through micromechanical interlocking provided by two different types of geogrids. These findings are applied to model the resilient response characteristics of geogrid-stabilized base course composite systems. Using three pairs of bender elements as shear wave transducers, horizontal stiffness profiles were determined above mid-heights of aggregate specimens. For two types of geogrids with square- and triangular-shaped apertures, the shear modulus profiles decreased moving away from the geogrid location. Based on a relationship for aggregates, resilient modulus was estimated from the shear modulus. Considering the variations in resilient moduli with distance from the geogrid location, the local stiffness enhancements provided by the two geogrid types were assigned to modulus profiles of a geogrid-stabilized aggregate base course in flexible pavement mechanistic analysis and modeling. The modeling results demonstrate the effect of geogrid base stabilization on the computed pavement resilient responses for both geogrid types. The sublayering approach which properly considers modeling of the geogrid influence zone could be effectively used in mechanistic analysis of a geogrid-stabilized pavement system.","PeriodicalId":12616,"journal":{"name":"Geosynthetics International","volume":" ","pages":""},"PeriodicalIF":4.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43666576","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