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A hybrid contact approach for modeling soil-structure interaction using the material point method

Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1864-1882页

作者： Qinyang Sang Yonglin Xiong Rongyue Zheng Xiaohua Bao guanlin ye Feng Zhang Key Laboratory of Impact and Safety Engineering Ministry of EducationSchool of Mechanical Engineering and MechanicsNingbo UniversityNingbo315211China Institute of Geotechnical Engineering Ningbo UniversityNingbo315211China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen518060China Department of Civil Engineering Shanghai Jiao Tong UniversityShanghai200240China Department of Civil Engineering Nagoya Institute of TechnologyShowa-kuGokiso-choNagoya466-8555Japan

The grid-based multi-velocity field technique has become increasingly popular for simulating the Material Point Method(MPM)in contact problems.However,this traditional technique has some shortcomings,such as(1)early contact and contact penetration can occur when the contact conditions are unsuitable,and(2)the method is not available for contact problems involving rigid-nonrigid materials,which can cause numerical instability.This study presents a new hybrid contact approach for the MPM to address these limitations to simulate the soil and structure interactions.The approach combines the advantages of point-point and point-segment contacts to implement contact detection,satisfying the impenetrability condition and smoothing the corner contact problem.The proposed approach is first validated through a disk test on an inclined slope.Then,several typical cases,such as granular collapse,bearing capacity,and deformation of a flexible retaining wall,are simulated to demonstrate the robustness of the proposed approach compared with FEM or analytical solutions.Finally,the proposed method is used to simulate the impact of sand flow on a deformable structure.The results show that the proposed contact approach can well describe the phenomenon of soil-structure interaction problems.

关键词： Material point method Soil-structure interaction Numerical simulation Contact algorithm

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Unified description of different soils based on the superloading and subloading concepts

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 239-254页

作者： Yong Lu Yu Jiang Wenxuan Zhu Yuanfeng Bao guanlin ye Feng Zhang Department of Civil Engineering Suzhou University of Science and TechnologySuzhou215011China Department of Civil Engineering Shanghai Jiao Tong UniversityShanghai200240China Suzhou Integrated Infrastructure Technology Research Institute(SITRI) Suzhou215000China Department of Civil Engineering Nagoya Institute of TechnologyNagoya466-8555Japan

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.***.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.***.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.

关键词： Elastoplastic behavior Constitutive model Sand Clay State dependence

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A miniature triaxial apparatus for investigating the micromechanics of granular soils with in situ X-ray micro-tomography scanning

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Frontiers of Structural and Civil Engineering 2020年第2期14卷 357-373页

作者： Zhuang CHENG Jianfeng WANG Matthew Richard COOP guanlin ye Department of Architecture and Civil Engineering City University of Hong KongHong Kong 999077China Shenzhen Research Institute of City University of Hong Kong Shenzhen 518057China Department of Civil Environmental and Geomatic EngineeringUniversity College LondonLondon WC1E 6BTUK Department of Civil Engineering Shanghai Jiaotong UniversityShanghai 200240China

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.

关键词： triaxial apparatus X-ray fiCT in situ test micro-scale mechanical behavior granular soils

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冲击荷载引起的颗粒破碎对钙质砂液化特性的影响

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工程地质学报 2024年第2期32卷 410-419页

作者：叶斌毛盘叶冠林同济大学土木工程学院上海200092 上海交通大学船舶海洋与建筑工程学院上海200240

钙质砂具有孔隙率高、强度低、易破碎的特点。同时,钙质砂在波浪和地震等振动荷载的作用下,也具有发生液化的可能性。为探究钙质砂颗粒破碎与抗液化强度的关系,对南海永兴岛的钙质砂开展了三轴试验研究工作。首先,利用小型手动冲击装置... 详细信息

钙质砂具有孔隙率高、强度低、易破碎的特点。同时,钙质砂在波浪和地震等振动荷载的作用下,也具有发生液化的可能性。为探究钙质砂颗粒破碎与抗液化强度的关系,对南海永兴岛的钙质砂开展了三轴试验研究工作。首先,利用小型手动冲击装置对钙质砂进行破碎处理,获取了不同相对破碎率(Br)的试样,然后利用多功能动三轴仪分别对原始试样和不同破碎程度的试样进行了液化试验。结果表明:在相同围压和密实度条件下,钙质砂的抗液化强度(CRR)随着Br的增大而降低,但降低速率会随着Br的增大而减小。另一方面,相对密实度的增大会削弱颗粒破碎对钙质砂抗液化能力的影响。最后,为了定量评价颗粒破碎对钙质砂抗液化强度的影响,建立了Br-CRR的数学关系。

关键词：钙质砂颗粒破碎液化特性三轴试验

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Unified description of sand behavior

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Frontiers of Structural and Civil Engineering 2011年第2期5卷 121-150页

作者： Feng ZHANG Bin ye guanlin ye Department of Civil Engineering Nagoya Institute of TechnologyShowa-kuGokiso-choNagoya 466-8555Japan Department of Geotechnical Engineering Tongji UniversityShanghai 200092China Department of Civil Engineering Shanghai Jiao Tong UniversityShanghai 200240China

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.

关键词： constitutive model sand stress-induced anisotropy density structure

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固体火箭发动机粘接界面剪切蠕变特性分析与快速预测模型

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固体火箭技术 2024年第2期47卷 208-215页

作者：叶冠麟刘通申志彬吴伟静国防科技大学空天科学学院长沙410073 空天任务智能规划与仿真湖南省重点实验室长沙410073 内蒙动力机械研究所呼和浩特010010

固体火箭发动机在立式贮存期间,受自重载荷影响,在侧壁粘接界面会产生剪切蠕变行为,威胁发动机的结构安全性和贮存寿命。为研究粘接界面剪切蠕变特性,对某型发动机剪切界面试验件进行了多种温度与应力下的剪切蠕变实验,获得其剪应变-时... 详细信息

固体火箭发动机在立式贮存期间,受自重载荷影响,在侧壁粘接界面会产生剪切蠕变行为,威胁发动机的结构安全性和贮存寿命。为研究粘接界面剪切蠕变特性,对某型发动机剪切界面试验件进行了多种温度与应力下的剪切蠕变实验,获得其剪应变-时间关系,分析了粘接界面力学性能随温度与剪切蠕变载荷变化的响应和规律,最终构建了一种适用于线性粘弹性阶段的发动机粘接界面剪切蠕变快速预测模型。结果表明,该快速预测模型构建方式简单,且预测值与实验值相差低于10%,可以较好地预测线性粘弹性阶段粘接界面短期蠕变行为。

关键词：固体火箭发动机立式贮存粘接界面剪切蠕变快速预测模型

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Strength and dilatancy behaviors of deep sands in Shanghai with a focus on grain size and shape effect

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第6期12卷 1214-1225页

作者： Bandana Tiwaria guanlin ye Mingguang Li Usama Khalid Santosh Kumar Yadav Department of Civil Engineering and State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai200240China Department of Civil Engineering IOEPulchowk CampusTribhuvan UniversityLalitpur44700Nepal

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.***.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.

关键词： Deep sands in Shanghai Laboratory tests Shear strength Dilatancy Relative density

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Numerical Modeling of the Dynamic Response of an Elastoplastic Seabed Under Wave-Current Interactions

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Journal of Ocean University of China 2023年第1期22卷 43-52页

作者： SHAN Zhigang ZHU Zhipeng WANG Dong ye guanlin Zhejiang Huadong Construction Engineering Corporation Limited Hangzhou 310014China MOE Key Laboratory of Marine Environment and Ecology Ocean University of ChinaQingdao 266100China Laboratory of Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Department of Civil Engineering and State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

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.

关键词： seabed liquefaction wave current finite element methods cyclic loading

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Seismic behavior of breakwaters on complex ground by numerical tests:Liquefaction and post liquefaction ground settlements

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 325-342页

作者： Gu Linlin Zhang Feng Bao Xiaohua Shi Zhenming ye guanlin Ling Xianzhang Department of Civil Engineering Qingdao University of Technology Department of Civil Engineering Nagoya Institute of Technology Department of Civil Engineering Shenzhen University Department of Geotechnical Engineering Tongji University Department of Civil Engineering Shanghai Jiao Tong University

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.

关键词： breakwater settlement earthquake numerical test liquefaction

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Settlement mechanism of piled-raft foundation due to cyclic train loads and its countermeasure

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Earthquake Engineering and Engineering Vibration 2017年第3期16卷 499-511页

作者： Gu Linlin ye guanlin Wang Zhen Ling Xianzhang Zhang Feng Department of Civil Engineering Qingdao University of Technology Department of Civil Engineering and State key Laboratory of Ocean Engineering Shanghai Jiaotong University Department of Geotechnical Engineering Tongji University Department of Civil Engineering Nagoya Institute of Technology

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.

关键词： high-speed train piled-raft foundation FEM settlement soil-pile interaction fracturing grouting.

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