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Experimental study of the effects of non-uniformly distributed fine soil on mechanical properties of Shenyang–Dandong Railway coarse-grained soil

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Research in Cold and Arid Regions 2015年第5期7卷 503-512页

作者： QianMi Yu JianKun Liu JingYu Liu DingJun Lv TengFei Wang School of Civil Engineering Beijing Jiaotong University

The stress produced by repeated train loads decreases with increasing railway subgrade bed depth, and slightly weathered coarse particles of subgrade bed fillings can be broken at different levels under continuous load. Thus, the mass of fine soil, with a diameter of not more than 0.075 mm, is different at different depths. fine soil is also sensitive to frost heave and thaw settlement. In order to study the effects of non-uniformly distributed fine soil on the mechanical properties of coarse-grained soil of the Shenyang-Dandong Railway, triaxial tests were conducted with three types of specimens, un- dergoing six freeze-thaw cycle numbers （0, 1, 3, 7, 9, 12） and three confining pressures （100, 200, 300 kPa）. The freezing temperature is -5 ~C and the thawing temperature is ＋15 ~C. The stress-strain behavior, static strength, resilient modulus, cohesive force and the angle of internal friction were measured for different tested specimens. As a result, the law of static strength and resilient modulus of different specimens following the increase of freeze-thaw cycles under three confining pressures is obtained. The changing law of cohesive force and friction angle of three specimens following the increase of freeze-thaw cycles is also calculated, and the different results of different specimens are also compared.

关键词： fine soil non-uniform distribution freeze-thaw cycles soil mechanical properties

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Removal of As and Heavy Metals （Cd, Cu and Pb） in fine soil from soil Washing Process Using Chelating Agent

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Journal of Earth Science and Engineering 2012年第10期2卷 596-601页

作者： Minah Oh So Young Moon SeungJin Oh HeeHoon Chae Jai-Young Lee Department of Environmental Engineering The University of Seoul Seou1130-743 South Korea Research and Development Division Hyundai Engineering and Construction Yongin 466-912 South Korea

fine soil generated from the soil washing process can be the second problem, as contaminants are concentrated in the fine soil, and also took the difficult forms to treat because soluble and exchangeable fractions are already removed by soil washing process; therefore, the fine soil is indicated to hazardous waste, and discarded in hazardous waste landfill. Thus, this research would be performed that arsenic and heavy metals formed difficult to remove in the fine soil were converted to more treatable fractions with chelating agents. Moreover, feasibility study to apply the second remediation targeted to the fine soil inquired. As a result, the chelating agent was decided 50 mM Na2EDTA, and it could develop the complex. In addition, the result of sequential extraction showed that Mn/Fe-oxide fraction, comprised about 28% of amount at first, was decreased about 16%, and organic fraction, consisted approximately 20%, was also decreased about 11%, while exchangeable fraction and carbonate fraction were increased. This result means that the difficult fractions removed could change fractions） by chelating agent. This research can provide the possibility hazardous waste because of difficulty to remediate. the more treatable fractions （exchangeable and carbonate to treat the fine soil, although the fine soil was regarded to

关键词： fine soil chelating agents arsenic heavy metals.

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Performance of a Nonwoven Geotextile Reinforced Wall with Unsaturated fine Backfill soil

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Journal of Civil Engineering and Architecture 2013年第10期7卷 1253-1259页

作者： Femando Henrique Martins Portelinha Benedito de Souza Bueno Jorge Gabriel Zomberg Department of Civil Engineering Federal University of Sao Carlos Sao Carlos/SP 13564-350 Brazil Sao Carlos Engineering School University of Sao Paulo Sao Carlos/SP 13566-536 Brazil Civil Engineering Department University of Texas at Austin Austin/TX 78712-0280 USA

The use of marginal backfills in GSE （geosynthetic stabilized earth） walls has not been recommended by different standards specifications. Restrictions are motivated by the poor hydraulic conductivity of fine soils that are capable of developing of water pressures. However, the use of granular materials can expend the cost of the construction. As a result, local soils, granular or not, have been increasingly used. Unsaturated conditions of fine soils may result in convenient performance even using extensible reinforcements. This paper evaluates the performance of a full scale model of a nonwoven geotextile reinforced wall constructed with fine grained soil backfill. The unsaturated condition was maintained and matric suctions, displacements and reinforcement strains were monitored during the test. Results have shown that the unsaturated condition of the backfill allowed maximum reinforcement peak strain of 0.4 %. For the case of a wrap faced wall on a firm foundation the performance and good agreement between measured strains and factors of safety from limit equilibrium analyses have shown the maintenance of unsaturated conditions as an economical alternative to the use of high quality fill.

关键词： Reinforced soil wall nonwoven geotextile fine soil unsaturated soil.

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