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geotextile protection of glacier:Observed and simulated impacts on energy and mass balance

Advances in Climate Change Research 2023年第6期14卷 963-975页

作者： Fei-Teng WANG Shuang-Shuang LIU Xing WANG Hui-Lin LI Chun-Hai XU Lin WANG Yu-Ang XUE Xiao-Ying YUE State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

The detailed physical processes involved in slowing glacier ablation by material cover remain poorly understood so *** the present study,using the snow cover model SNOWPACK,the effect of geotextile cover on the energy and mass balance at the tongue of the Urumqi Glacier No.1(Chinese Tien Shan)was simulated between July 12,2022 and August 31,*** mass changes and the energy fluxes with and without material cover were *** results indicated that the geotextile covering reduced glacier ablation by approximately 68%compared to the ablation in the uncovered *** high solar reflectivity of the geotextile reduced the net short-wave radiation energy available for the melt by 45%.Thermal insulation of the geotextile reduced the sensible heat flux by 15%.In addition,the wet geotextile exerted a cooling effect through long-wave radiation and negative latent heat *** cooling effect reduced the energy available for ablation by 20%.Consequently,only 37%of the energy was used for melting compared to that used in the uncovered regions(67%).Sensitivity experiments revealed that the geotextile cover used at a thickness range of 0.045-0.090 m reduced the ice loss by approximately 68%-72%,and a further increase in the thickness of the geotextile cover led to little improvements.A higher temperature and greater wind speed increased glacier ablation,although their effects were *** the precipitation was set to zero,it led to a significantly increased ***,the geotextile effectively protected the glacier tongue from rapid melting,and the observed results have provided inspiration for developing an effective and sustainable approach to protect the glaciers using geotextile cover.

关键词： Artificial melt reduction SNOWPACK geotextile Energy and mass balance Urumqi glacier No.1 Chinese Tien Shan

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Numerical evaluation of sample size effect on the stress-strain behavior of geotextile-reinforced sand

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第8期11卷 555-562页

作者： I.HOSSEINPOUR S.H.MIRMORADI A.BARARI M.OMIDVAR Department of Civil Engineering University of Mazandaran Department of Civil Engineering Aalborg University Engineering Faculty Golestan University

This paper studies the effect of sample size on the stress-strain behavior and strength characteristics of geotextile reinforced sand using the finite element numerical analysis. The effect of sample size was investigated by studying the effects of varying the number of geotextile layers, the confining pressure and the type of geotextile. Modeling was performed on samples with five different diameters: 38, 100, 200, 500 and 600 mm. The elastic-plastic Mohr-Coulomb model was used to simulate sand behavior. Results showed that small-sized samples show higher values of peak strength and higher axial strain at failure in comparison with large-sized samples. The size effect on the behavior of samples became further apparent when the number of geotextile layers was increased or the confining pressure was decreased. In addition, the results indicated that the magnitude of the size effect on the mechanical behavior of reinforced sand decreases with an increase in the sample size.

关键词： Reinforced sand geotextile Peak strength Mohr-Coulomb Size effect

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Reinforcement of Soft Foundation with geotextile and Observation for Sea Dike Project of Zhapu Port

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海洋工程：英文版 2003年第2期17卷 295-306页

作者：章香雅郑祖祯 Design Institute of Bureau of Qiantang River in Zhejiang Province

The design method of reinforcement of soft foundation with geotextile for the sea dike of the Zhapu Port is discussed in this paper. The prototype behaviours such as pore water pressure, settlement and so on were observed. The degree of consolidation is found out from observed pore water pressure and observed settlement respectively, then the strength increment of soil is calculated and compared with that obtained from vane shear tests. For the use of observed pore water pressure, the consolidation coefficient of soil is deduced approximately with a method named experimental exponential interpolation. The degree of consolidation of the ground is deduced theoretically from the dissipation of pore water pressure. Besides, the logarithmic curve and hyperbola are used to fit the observed time-settlement curve, and the degree of consolidation of soil is obtained according to the definition of the consolidation degree. After preliminary verification with observed prototype data, the method to reinforce the low dike with geotextile is considered to be simple and rational, and it can also reduce the construction cost.

关键词： geotextile reinforcement soft foundation design prototype observation analysis

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Laboratory Study of geotextiles Performance on Reinforced Sandy Soil

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Journal of Earth Science 2016年第6期27卷 1060-1070页

作者： Brahim Abdelkader Arab Ahmed Belkhatir Mostefa Shahrour Isam Laboratory of Materials Sciences and Environment Civil Engineering Department Hassiba Ben Bouali University of ChiefChief 02000Algeria Laboratory of Civil Engineering and Geo-Environment(LGCGE) University of Lille 1Villeneuve d'Ascq 59650France

This paper presents the results of triaxial tests conducted for the investigation of the influence of geotextiles on stress-strain and volumetric change behaviour of reinforced sandy soil. Tests were carried out on loose sandy soil. The experimental program includes drained compression tests on samples reinforced with different values of both geotextiles layers （Ng） and confining pressure （σ′c）. Two methods of preparation were used： air pluviation （AP） and moist tamping （MT）. Test results show that the geotextiles induce a quasi-linear increase in the stress deviator （q） and volume contraction in the reinforced sand. Method of preparation significantly affects the shear strength; samples prepared by the air pluviation method and mobilized deviator stresses are significantly higher than those prepared by moist tamping method. geotextiles restrict the dilation of reinforced sandy soil and consequently the contraction increases. The mobilized friction angle increases with increasing number of layers and decreases with increasing initial confining pressure. Samples prepared by moist tamping present mobilized friction angles significantly lower than those prepared by air pluviation method. For samples prepared by the air pluviation method, the secant modulus at ε1=1% and 5% decreases with increasing geotextile layers; those prepared by the moist tamping method, secant modulus at ε1=1% and 5% increases with increasing number of geotextile layer sand confining pressure. From 10% axial strain, secant modulus increases with increasing inclusions of geotextile layers.

关键词： sand triaxial geotextile drained method of preparation strength.

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Comparison of geotextiles by Aeration Vacuum Rapid Dewatering Technique on Dredged Sludge

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Journal of Harbin Institute of Technology(New Series) 2016年第4期23卷 22-26页

作者： Yuan Zhou Jie Bian Hui Tao Jingming Xu Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China Geotechnical Research Institute Hohai UniversityNanjing 21098China Shanghai Municipal Engineering Design Institute (Set) Co. Ltd.Shanghai 200092China College of Mathematics Physics and Information EngineeringAnhui Science and Technology UniversityChuzhou 233100China

In order to accelerate the consolidation of the dredged sludge and look for an effective material for mud-water separation,the study on the comparison of geotextiles is carried on. It is based on the laboratory model test of aeration vacuum rapid mud- water separating( AVMWS) technique and evaluated by the cumulative weight of pumping water,the decrease of moisture content and the stable pumping speed. The results show that woven fabric is the best anti- clogging aeration vacuum material,followed by machine-woven fabric and non-woven fabric is the worst. The analysis has been proposed from two aspects of geotextile weaving technology and aeration vacuum condition.

关键词： aeration vacuum geotextile mud-water separation comparison

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A STUDY OF THE SPECIMEN SIZE OF STRIP TENSILE TEST FOR NEEDLE-PUNCHED NON-WOVEN geotextileS

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Journal of China Textile University(English Edition) 1993年第1期10卷 33-39页

作者：储才元 Dept.of Textile Engineering

In this paper,the failure features of strip tensile specimen were observed and analysed for need-le-punched non-woven geotextiles.A mechanical model which expresses the relation between thetensile modulus,the strip specimen size,contraction factor and the tensile strength of non-wovenfabric was *** theoretical prediction showed that the main factor influencing tensilestrength of non-woven geotextile specimens with different size is the contraction factor of specimenor the specimen aspect ratio(width/length).The larger the aspect ratio,the higher the tensilestrength test value of geotextiles,but the experiments showed that the specimen tensile strength isnot increased with increasing the width of *** reason was discussed and it seemed thatthe deviation could be served as an indication of the degree of imperfectness of the non-wovenstructure.

关键词： tensile strength non-woven fabrics specimens aspect ratio failure mechanical model geotextile contraction factor

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Processing Methods and Properties of Two Composite geotextiles

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Journal of China Textile University(English Edition) 2000年第3期17卷 84-86页

作者：钱强储才元

In order to develope new composite geotextiles with good comprehensive properties,the needle-punched composite geotextiles and adhesive bonded composite geotextiles were made in the factory and laboratory *** two processing methods were studied and the mechanical and hydraulic properties of the two kinds of products were tested and *** experimental resultsshow that the breaking strength of needle-punched composite geotextiles is much lower than that of adhesive bonded composite geotextiles and the latter also have better hydraulic properties than the former which used

关键词： composite geotextile adhesive permeability breaking strength peeling strength .

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Novel experimental techniques to assess the time-dependent deformations of geosynthetics under soil confinement

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第2期13卷 410-419页

作者： Carina Maia Lins Costa Jorge Gabriel Zornberg Department of Civil Engineering Federal University of Rio Grande do NorteAv.Senador Salgado Filho 3000NatalRio Grande do Norte59078-970Brazil Department of Civil Architectural and Environmental Engineering The University of Texas at Austin301 E.Dean KeetonAustinTX78712-0280USA

A new experimental approach to assess the impact of soil confinement on the long-term behavior of geosynthetics is presented in this *** experimental technique described herein includes a novel laboratory apparatus and the use of different types of tests that allow generation of experimental data suitable for evaluation of the time-dependent behavior of geosynthetics under soil *** soil-geosynthetic interaction equipment involves a rigid box capable of accommodating a cubic soil mass under plane strain conditions.A geosynthetic specimen placed horizontally at the mid-height of the soil mass is subjected to sustained vertical pressures that,in turn,induce reinforcement axial loads applied from the soil to the *** previously reported studies on geosynthetic behavior under soil confinement,the equipment was found to be particularly *** minor setup modifications,not only interaction tests but also in-isolation geosynthetic stress relaxation tests and soil-only tests under a constant strain rate can be conducted using the same ***,the time histories of the reinforcement loads and corresponding strains are generated throughout the *** from typical tests conducted using sand and a polypropylene woven geotextile are presented to illustrate the proposed experimental *** testing procedure was found to provide adequate measurements during tests,including good repeatability of test *** soilegeosynthetic interaction tests were found to lead to increasing geotextile strains with time and decreasing reinforcement tension with *** test results highlighted the importance of measuring not only the time history of displacements but also that of reinforcement loads during *** approach of using different types of tests to analyze the soilegeosynthetic interaction behavior is an innovation that provides relevant insight into the impact of soil confinement on the time-dependent deformations of geos

关键词： Geosynthetics geotextile Creep Stress relaxation Reinforced soil Long-term deformation

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Investigation on Porosity and In-plane Water Permeability of Nonwoven geotextiles

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Journal of China Textile University(English Edition) 1998年第2期15卷 51-54页

作者：魏取福贺福敏迟景魁

Nonwoven geotextiles have been widely used as drains orfilters in many civil *** hydraulic charac-teristics of geotextiles are the basic function in these *** in-plane permeability of nonwoven geo-textiles was discuss... 详细信息

关键词： geotextile nonwoven geotextile in - plane per-meability.

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Impact of repeated loading on mechanical response of a reinforced sand

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第4期11卷 804-814页

作者： Aida Mehrpazhouh Seyed Naser Moghadas Tafreshi Mehdi Mirzababaei Department of Civil Engineering K.N. Toosi University of TechnologyTehranIran School of Engineering and Technology Central Queensland University120 Spencer StreetMelbourneVictoria3000Australia

Pavements constructed over loosely compacted subgrades may not possess adequate California bearing ratio (CBR) to meet the requirements of pavement design codes,which may lead to a thicker pavement design for addressing the required *** have been proven to be effective for mitigating the adverse mechanical behaviors of weak soils as integrated constituents of base and sub-base layers in road *** study investigated the behaviors of unreinforced and reinforced sand with nonwoven geotextile using repeated CBR loading test (followed by unloading and reloading).The depth and number of geotextile reinforcement layers,as well as the compaction ratio of the soil above and below the reinforcement layer(s) and the compaction ratio of the sand bed,were set as variables in this *** layers were placed at upper thickness ratios of 0.3,0.6 and 0.9 and the lower thickness ratio of *** compaction ratios of the upper layer and the sand bed varied between 85% and 97% to simulate a dense layer on a medium dense sand bed for all unreinforced and reinforced testing *** CBR loading tests were conducted to the target loads of 100 kgf,150 kgf,200 kgf and 400 kgf,respectively (1 kgf=9.8 N).The results indicated that placing one layer of reinforcement with an upper thickness ratio of 0.3 and compacting the soil above the reinforcement to compaction ratio of 97% significantly reduced the penetration of the CBR piston for all target repeated load ***,using two layers of reinforcement sandwiched between two dense soil layers with a compaction ratio of 97% with upper and lower thickness ratios of 0.3 resulted in the lowest penetration.

关键词： Geosynthetics geotextile Reinforced soil California bearing ratio (CBR) Elastic behavior Repeated loading Dense sand Medium dense sand

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