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Investigation on the properties of compacted silty clay subjected to electro-osmosis using bender element

Research in Cold and Arid Regions 2023年第6期15卷 253-261页

作者： KangWei Tang Chuang Lin Hao Wang WeiJun Qin DeCheng Feng Feng Zhang School of Transportation Science and Engineering Harbin Institute of Technology73 Huanghe RoadHarbinHeilongjiang 150090China Laboratoire Navier/CERMES Ecole des Ponts ParisTech6 et 8 Avenue Blaise PascalCite DescartesChamps-sur-Marne77455 Marne La Vallee Cedex 2France Key Laboratory of Transportation Industry for Highway Construction and Maintenance Technology in Seasonal Frozen Soil Areas(Changchun) 4887 Xinglong RoadChangchunJinlin 130102China

The moisture content of subgrade soil in seasonally frozen regions is often higher than its optimum value,leading to a decline in mechanical properties and a reduction in subgrade bearing capacity.Electro-osmosis has shown promise as a technology for controlling subgrade moisture,but significant heterogeneity has also been observed in treated soil.This study investigates the impact of electro-osmosis on soil stiffness through a series of bender element tests of compacted clay.The effects of dry density and supply voltage on the performance of electroosmosis treatment and the layered structure and anisotropy of the soil were analyzed.The results show that electro-osmosis treatment increased the shear wave velocity of the soil by 140% compared to untreated saturated soil and by 70% compared to soil with optimum water content.It has also been found that layered compaction of soil resulted in a layered structure,with electro-osmosis having a more prominent impact on soil near the cathode,resulting in a more pronounced layered structure.Besides,electro-osmosis was found to enhance soil anisotropy,particularly near the anode.Increasing the dry density and voltage levels can help improve soil uniformity.These findings provide insights into the potential use of electro-osmosis in improving soil stiffness,which could benefit various engineering applications.

关键词： Subgrade soil Electro-osmosis bender element Layered structure Anisotropy

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An improved specimen preparation method for marine shallow gasbearing sand sediments and its validations

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 682-693页

作者： Yong Wang Lingwei Kong Min Wang Yanli Wang Peng Cheng State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Fluid Dynamics and Solid Mechanics Theoretical DivisionLos Alamos National LaboratoryLos Alamos87545USA Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources Yangtze River Scientific Research InstituteWuhan430010China Hunan University Design Institute Co. Ltd.Changsha410082China

Instabilities of shallow gas-charged seabed are potential geological hazards in ocean engineering.In practice,the conventional field sampling techniques failed to obtain undisturbed gas-bearing sediments from the seabed for laboratory mechanical testing because of sensitive gas exsolution and escape from sediments.However,preparation of representative remoulded gas-charged specimens is a challenging issue,because it is rather difficult to quantitatively control the gas content and obtain uniform distribution of gas bubbles within the specimen.Given the above problems,this work proposes a reliable approach to reconstitute the high-saturation specimen of gas-charged sediments in the laboratory by an improved multifunction integrated triaxial apparatus(MITA).This apparatus is developed based on an advanced stress path triaxial system by introducing a temperature-controlled system and a wavemonitoring system.The temperature-controlled system is used to accurately mimic the in situ environments of sediments in the seabed.The wave-monitoring system is utilized to identify exsolution point of free gas and examine the disturbance of gas to specimens during gas exsolution.The detailed procedure of gassy specimen preparation is introduced.Then,the quality of prepared specimens using our improved apparatus is validated by the high-resolution micro-X-ray computed tomography(mCT)scanning test,from which bubble occurrence and size distribution within the gassy sand specimen can be obtained;and preliminary mechanical tests on gassy sand specimens with various initial saturation degrees are performed.The proposed specimen preparation procedure succeeds in proving the postulated occurrence state of gas bubbles in coarse-grained sediments and accurately controlling the gas content.

关键词： Shallow gas Gas-bearing sediments Bubbles Mechanical behaviour bender element

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Pre-Failure Behavior of Deep-Situated Osaka Clay

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China Ocean Engineering 1998年第4期13卷 453-465页

作者： T.HONGO M.FUKUDA T.ADACHI F.OKA Vice DirectorProfessorSchool of GraduatesKyoto UniversitySakyo-ku HonmachiKyotoJapanAcademician of Chinese Academy of EngineeringGeotechnical Engineering DepartmentNanjing Hydraulic Research Institute.Nanjing 210024P.RChina DirectorOsaka Soil Test LabItachibori 4-3-2Nishi-kuOsakaJapan.of Depart.Osaka Soil Test LabItachibori 4-3-2Nishi-kuOsakaJapan

Great interest has been aroused on deeply-situated Osaka clay since Kobe Earthquake in 1994. In this paper is presented the analysis on the results of a series of lab tests on Osaka clay situated from 100 m to 1500 m under the ground. The wave velocity method, bender element method, LDT and the formula derived by the authors are used, focus is put on the pre-failure mechanical behavior of the clay. The analysis shows that, (i) pore-pressure coefficient B is less than 1.0, (ii) the relationship between shear modulus and Poisson's ratio is not in agreement with that reported before, (iii) the modulus measured with LDT is still less than that measured with bender element method, and (iv) there are two threshold strains, within which the clay can be considered as elastic, and both of them are larger than that reported before.

关键词： pre-failure behavior natural clays wave velocity method bender element LDT

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