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| 1 | Unified description of sand behavior显示文摘In this paper,the mechanical behavior of sand,was systematically described and modeled with a elastoplastic model proposed by Zhang et al.[1].Without losing the generality of the sand,a specific sand called as Toyoura sand,a typical clean sand found in Japan,has been discussed in detail.In the model,the results of conventional triaxial tests of the sand under different loading and drainage conditions were simulated with a fixed set of material parameters.The model only employs eight parameters among which five parameters are the same as those used in Cam-clay model.Once the parameters are determined with the conventional drained triaxial compression tests and undrained triaxial cyclic loading tests,then they are fixed to uniquely describe the overall mechanical behaviors of the Toyoura sand,without changing the values of the eight parameters irrespective of what kind of the loadings or the drainage conditions may be.The capability of the model is discussed in a theoretical way. | Feng ZHANG Bin YE Guanlin YE | 2011 | Frontiers of Structural and Civil Engineering2011，5，2： | 7 |
| 2 | Comparative study on corrosion resistance and lubrication function of lithium complex grease and polyurea grease显示文摘In this study,lithium complex grease(LCG)and polyurea grease(PUG)were synthesized using mineral oil(500 SN)and polyalphaolefin(PAO40)as base oil,adsorbed onto lithium complex soap and polyurea as thickeners,respectively.The effects of grease formulation(thickener and base oil with different amounts(80,85,and 90 wt%)on the corrosion resistance and lubrication function were investigated in detail.The results have verified that the as-prepared greases have good anti-corrosion ability,ascribed to good salt-spray resistance and sealing function.Furthermore,the increase in the amount of base oil reduces the friction of the contact interface to some extent,whereas the wear resistance of these greases is not consistent with the friction reduction,because the thickener has a significant influence on the tribological property of greases,especially load-carrying capacity.PUG displays better physicochemical performance and lubrication function than LCG under the same conditions,mainly depending on the component/structure of polyurea thickener.The polyurea grease with 90 wt%PAO displays the best wear resistance owing to the synergistic lubrication of grease-film and tribochemical film,composed of Fe_(2)O_(3),FeO(OH),and nitrogen oxide. | Guanlin REN Pengfei ZHANG Xiangyuan YE Wen LI Xiaoqiang FAN Minhao ZHU | 2021 | Friction2021，9，1： | 5 |
| 3 | Seismic behavior of breakwaters on complex ground by numerical tests:Liquefaction and post liquefaction ground settlements显示文摘A large number of breakwaters have been constructed along coasts to protect humans and infrastructures from tsunamis.There is a risk that foundation soils of these structures may liquefy,or partially liquefy during the earthquake preceding a tsunami,which would greatly reduce the structures’capacity to resist the tsunami.It is necessary to consider not only the soil’s liquefaction behavior due to earthquake motions but also its post-liquefaction behavior because this behavior will affect the breakwater’s capacity to resist an incoming tsunami.In this study,numerical tests based on a sophisticated constitutive model and a soil-water coupled finite element method are used to predict the mechanical behavior of breakwaters and the surrounding soils.Two real breakwaters subjected to two different seismic excitations are examined through numerical simulation.The simulation results show that,earthquakes affect not only the immediate behavior of breakwaters and the surrounding soils but also their long-term settlements due to post-earthquake consolidation.A soil profile with thick clayey layers beneath liquefied soil is more vulnerable to tsunami than a soil profile with only sandy layers.Therefore,quantitatively evaluating the seismic behavior of breakwaters and surrounding soils is important for the design of breakwater structures to resist tsunamis. | Gu Linlin Zhang Feng Bao Xiaohua Shi Zhenming Ye Guanlin Ling Xianzhang | 2018 | Earthquake Engineering and Engineering Vibration2018，17，2： | 3 |
| 4 | A miniature triaxial apparatus for investigating the micromechanics of granular soils with in situ X-ray micro-tomography scanning显示文摘The development of a miniature triaxial apparatus is presented.In conjunction with an X-ray microtomography(termed as X-ray fiCT hereafter)facility and advanced image processing techniques,this apparatus can be used for in situ investigation of the micro-scale mechanical behavior of granular soils under shear.The apparatus allows for triaxial testing of a miniature dry sample with a size of 8 mm x 16 mm(diameter x height).In situ triaxial testing of a 0.4-0.8 mm Leighton Buzzard sand(LBS)under a constant confining pressure of 500 kPa is presented.The evolutions of local porosities(i.e.,the porosities of regions associated with individual particles),particle kinematics(i.e.,particle translation and particle rotation)of the sample during the shear are quantitatively studied using image processing and analysis techniques.Meanwhile,a novel method is presented to quantify the volumetric strain distribution of the sample based on the results of local porosities and particle tracking.It is found that the sample,with nearly homogenous initial local porosities,starts to exhibit obvious inhomogeneity of local porosities and localization of particle kinematics and volumetric strain around the peak of deviatoric stress.In the post-peak shear stage,large local porosities and volumetric dilation mainly occur in a localized band.The developed triaxial apparatus,in its combined use of X-ray|iCT imaging techniques,is a powerful tool to investigate the micro-scale mechanical behavior of granular soils. | Zhuang CHENG Jianfeng WANG Matthew Richard COOP Guanlin YE | 2020 | Frontiers of Structural and Civil Engineering2020，14，2： | 2 |
| 5 | A pneumatic shaking table and its application to a liquefaction test on saturated sand显示文摘 | Bin Ye Guanlin Ye Weimin Ye Feng Zhang | 2013 | Natural Hazards2013，，2： | 1 |
| 6 | Numerical Modeling of the Dynamic Response of an Elastoplastic Seabed Under Wave-Current Interactions显示文摘Wave-induced liquefaction of the seabed is a geohazard frequently encountered in shallow waters.Although widely discussed,most studies paid attention to the seabed response under a single sequence of wave loading.However,the seabed suffers from repeated‘wave loading–dissipation’phases in a real ocean environment.In this study,a homogeneous sandy seabed model is established to investigate the mechanism of wave-induced liquefaction by considering the existence of currents.Finite element analyses are conducted by incorporating a kinematic hardening elastoplastic model into the commercial package Abaqus.The constitutive model is validated against centrifugal wave tests.Parametric studies are conducted to demonstrate the effects of relative densities,current,and wave-loading history on the seabed response.The predicted excess pore pressure,effective stress paths,and associated variation of relative density are discussed in detail.The results show that the densification of soils significantly enhances the resistance against liquefaction,which provides new insight into the mechanism of residual liquefaction during wave sequences. | SHAN Zhigang ZHU Zhipeng WANG Dong YE Guanlin | 2023 | Journal of Ocean University of China2023，22，1： | 1 |
| 7 | Strength and dilatancy behaviors of deep sands in Shanghai with a focus on grain size and shape effect显示文摘With rapid development of infrastructures like tunnels and open excavations in Shanghai,investigations on deeper soils have become critically important.Most of the existing laboratory works were focused on the clayey strata up to Layer 6 in Shanghai,i.e.at depth of up to 40 m.In this paper,Layers 7,9,and 11,which were mostly formed of sandy soils at depth of up to 150 m,were experimentally investigated with respect to physico-mechanical behaviors.The stressestrain behaviors were analyzed by the consolidated drained/undrained(CD/CU)triaxial tests under monotonic loading.One-dimensional(1D)oedometer tests were performed to investigate the consolidation properties of the sandy soils.Specimens were prepared at three different relative densities for each layer.Also,the micro-images and particle size analyzers were used to analyze the shape and size of the sand grains.The influences of grain size,density,and angularity on the stressestrain behaviors and compressibility were also studied.Compared to the other layers,Layer 11 had the smallest mean grain size(D50),highest compressibility,and lowest shear strength.In contrast,Layer 9 had the largest mean grain size,lowest compressibility,and highest shear strength.Layer 7 was of intermediate mean grain size,exhibiting more compressibility and less shear strength than that of Layer 9.Also,the critical state parameters and maximum dilatancy rate of different layers were discussed. | Bandana Tiwaria Guanlin Ye Mingguang Li Usama Khalid Santosh Kumar Yadav | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，6： | 1 |
| 8 | Numerical modeling of changes in anisotropy during liquefaction using a generalized constitutive model显示文摘 | Bin Ye Guanlin Ye Feng Zhang | 2011 | Computers and Geotechnics2011，，： | 1 |
| 9 | Unified description of different soils based on the superloading and subloading concepts显示文摘Geotechnical engineering often involves different types of geomaterials,such as sandy soil and clayey soil.Existing studies have confirmed that these soils have some common features,i.e.their mechanical behaviors depend not only on the inherent characteristics but also on their initial states.To describe the main mechanical behaviors of different soils within a simple and reasonable constitutive framework is of great significance for the numerical analysis on geotechnical engineering.This paper first introduces a model based on the concepts of superloading and subloading,which considers the“state dependence”(effects of overconsolidation and structure)of soil and only adds two material parameters compared with the Cam-Clay model.Secondly,conventional triaxial tests are systematically carried out on four types of soils(i.e.sand,silty clay,clay,and intermediate soil)with different initial void ratios,and the mechanical similarities and differences of these soils are discussed uniformly.After that,six material parameters of these soils are uniformly determined based on the concepts of superloading and subloading,and then used in constitutive calculations to verify the feasibility.The calculated results show a good agreement with test data,indicating that the model based on the concepts of superloading and subloading has great potential for describing the general mechanical behaviors of different soils within a unified framework.This work is expected to be applied to constitutive selection and parameter determination in the geotechnical numerical analysis of complex soil profiles. | Yong Lu Yu Jiang Wenxuan Zhu Yuanfeng Bao Guanlin Ye Feng Zhang | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，1： | 0 |
| 10 | Stereodivergent Pd/Cu Catalysis for Asymmetric Desymmetric Alkylation of Allylic Geminal Dicarboxylates显示文摘AstereodivergentPd/Cucatalyst systemforasymmetric desymmetric alkylation of allylic geminal dicarboxylates has been developed,which was successfully applied to the asymmetric synthesis of β-hydroxycarbonylmotifs bearing a versatile carbon-carbon double bond in an enantio-and diastereodivergent manner.A wide scope of substrates including challenging alkylsubstituted,2-substituted,and3,3′-disubstitutedallylic species are compatible with this catalytic system,delivering the substituted products in high to excellent yieldsandwith excellent diastereo-(upto>20:1 dr)and enantioselectivities(up to>99%ee).Furthermore,the mechanism of this dual Pd/Cu catalytic system including:(1)the desymmetrization process ofgeminal dicarboxylates;(2)the origin of regioselectivity(branched or linear);(3)the enantio-and diastereoselectivity observed by changing the combinations of two chiral metal catalysts,have been carefully investigated by theoretical calculations. | Xiaohong Huo Ling Zhao Yicong Luo Yue Wu Yuwen Sun Guanlin Li Tatiana Gridneva Jiacheng Zhang Yong Ye Wanbin Zhang | 2022 | CCS Chemistry2022，4，5： | 0 |
| 11 | Settlement mechanism of piled-raft foundation due to cyclic train loads and its countermeasure显示文摘In this paper, numerical simulation with soil-water coupling finite element-finite difference(FE-FD) analysis is conducted to investigate the settlement and the excess pore water pressure(EPWP) of a piled-raft foundation due to cyclic high-speed(speed: 300km/h) train loading. To demonstrate the performance of this numerical simulation, the settlement and EPWP in the ground under the train loading within one month was calculated and confirmed by monitoring data, which shows that the change of the settlement and EPWP can be simulated well on the whole. In order to ensure the safety of train operation, countermeasure by the fracturing grouting is proposed. Two cases are analyzed, namely, grouting in No-4 softest layer and No-9 pile bearing layer respectively. It is found that fracturing grouting in the pile bearing layer(No-9 layer) has better effect on reducing the settlement. | Gu Linlin Ye Guanlin Wang Zhen Ling Xianzhang Zhang Feng | 2017 | Earthquake Engineering and Engineering Vibration2017，16，3： | 0 |
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