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Experimental study of two saturated natural soils and their saturated remoulded soils under three consolidated undrained stress paths

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Frontiers of Structural and Civil Engineering 2011年第2期5卷 225-238页

作者： Mingjing JIANG Haijun HU Jianbing PENG Serge LEROUEIL Department of Geotechnical Engineering and Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China School of Geological Engineering and Surveying Chang’an UniversityXi’an 710054China Department of Civil Engineering Laval UniversityQuebec G1K 7P4Canada

In this paper,an experimental investigation is conducted to study the mechanical behavior of saturated natural loess,saturated natural filling in ground fissure and their corresponding saturated remoulded soils under three consolidated undrained triaxial stress tests,namely,conventional triaxial compression test(CTC),triaxial compression test(TC)and reduced triaxial compression test(RTC).The test results show that stress-strain relation,***-softening or strain-hardening,is remarkably influenced by the structure,void ratio,stress path and confining *** structure,high void ratio,TC stress path,RTC stress path and low confining pressures are favorable factors leading to *** pore pressure during shearing is significantly affected by stress *** tested soils are different from loose sand on character of strain-softening and are different from common clay on excess pore water pressure *** critical states in p′-q space in CTC,TC and RTC tests almost lie on one line,which indicates that the critical state is independent of the above stress *** for remoulded loess or remoulded filling,the critical state line(CSL)and isotropic consolidation line(ICL)in e-log p′space are almost straight,while for natural loess or natural filling,in e-log p′space there is a turning point on the CSL,which is similar to the ICL.

关键词： stress paths static liquefaction natural soil remoulded soil loess structure total strength indices excess pore pressure

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Behavior of diatomaceous soil in lacustrine deposits of Bogota, Colombia

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第2期10卷 367-379页

作者： Bernardo Caicedo Cristhian Mendoza Fernando López Arcesio Lizcano Department of Civil and Environmental Engineering Universidad de Los AndesBogotáColombia Department of Civil Engineering Universidad Nacional de Colombia Sede ManizalesManizalesColombia Ecole Centrale Paris Laboratoire MSSMat-UMR CNRS 8579ParisFrance SRK Consulting VancouverCanada

This work presents a study on the behaviors of diatomaceous soils. Although studies are rarely reported on these soils, they have been identified in Mexico City, the Sea of Japan, the northeast coast of Australia,the equatorial Pacific, and the lacustrine deposit of Bogota(Colombia), among other locations. Features of this kind of soil include high friction angle, high initial void ratio, high compressibility index, high liquid limit, and low density. Some of these features are counterintuitive from a classical soil mechanics viewpoint. To understand the geotechnical properties of the diatomaceous soil, a comprehensive experimental plan consisting of more than 2400 tests was performed, including physical tests such as grain size distribution, Atterberg limits, density of solid particles, and organic matter content; and mechanical tests such as oedometric compression tests, unconfined compression tests, and triaxial *** tests were complemented with scanning electron microscope(SEM) observations to evaluate the microstructure of the soil. The test results show that there is an increase in liquid limit with increasing diatomaceous content, and the friction angle also increases with increasing diatomaceous content. In addition, several practical correlations were proposed for this soil type for shear strength mobilization and intrinsic compression line. Finally, useful correlations were presented, such as the relationship between the state consistency and the undrained shear strength, the friction angle and the liquid limit, the void ratio at 100 kPa and the liquid limit, the plasticity index and the diatomaceous content, among others.

关键词： Diatomaceous soil Soft soils Compressibility Friction angle natural soil

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Study of cadmium(Cd)-induced oxidative stress in Eisenia fetida based on mathematical modelling

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Pedosphere 2021年第3期31卷 460-470页

作者： Yucui NING Haoran ZHOU Enze WANG Congmin JIN Ying YU Xu CAO Dongxing ZHOU College of Resources and Environmental Science Northeast Agricultural UniversityHarbin 150030China College of Horticulture Science and Engineering Shandong Agricultural UniversityTaian 271018China Department of Grain Engineering Heilongjiang Communications PolytechnicQiqihar 161002China Institute of Microbiology Heilongjiang Academy of SciencesHarbin 150030China

As a sensitive biological indicator,earthworms are widely used to monitor various pollutants of soil and provide an early warning for soil ***,because many indices are involved in the exposure-induced oxidative stress response,practical applications of these indices are quite ***,it is appropriate to investigate the key monitoring index for use in early warning and pollution *** Eisenia fetida as an experimental model in an indoor simulation experiment,the mathematical modelling of the effect on oxidative stress in earthworms under cadmium(Cd)stress was *** test lasted 40 d,with the removal of one earthworm every 10 *** Cd2+concentration gradient was set as 0,1,10,20,100,200,400,and 800 mg kg^(-1) dry *** earthworms were divided into two sections from the clitellum for the determination of total protein(TP)and peroxidase(POD),superoxide dismutase(SOD),glutathione-S-transferase(GST),glutathione peroxidase(GPX),catalase(CAT),malondialdehyde(MDA),and acetylcholinesterase(AChE)*** showed that POD was the key index of oxidative stress in head tissues after 10 d of exposure,TP was the key index at 20 d,and POD became the key index again at 30 and 40 *** contrast,in tail tissues,MDA and SOD were the key indices at an exposure time of 10 d,GPX at 20 d,CAT and TP at 30 d,and POD and MDA at 40 *** results contribute to establishing a scientific method for ecotoxicological diagnosis and revealing the mechanism of soil Cd toxicity.

关键词： biological indicator biomarker earthworm factor analysis heavy metal pollution monitoring natural soil soil pollutant TOPSIS

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