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1. A Simple Anisotropic Bounding Surface Model for Saturated Soft Clay Considering Degradation under Cyclic Loading | |||
YANG Zhaohuan,WANG Jianhua | |||
Civil and Architectural Engineering 10 May 2017 | |||
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Abstract:In this study, a simple elastoplastic bounding surface plasticity model accounting for the degradation of saturated soft clay under cyclic loading is developed on the base of critical state soil mechanics and the bounding surface plasticity. The associated flow rule is adopted for simplicity. A preferable rotational hardening rule proposed by Dafalias is generalized into the domain of dynamic model after comparing different kinds of rotational hardening rules to describe the development of anisotropy in soft clay. A new interpolation function of plastic modulus associated with the length of the deviatoric plastic shear strain trajectory is introduced into the model to describe cyclic degradation. Compared with the existing cyclic elastoplastic model, the amount of parameters needed in the proposed model are relative fewer. Merely 9 material parameters with robust physical meaning including 5 Modified Cam Clay model constants are required. The applicability of the constitutive to predict the saturated soft clay's response is validated by comparing the model simulation of monotonic and cyclic loading behavior under undrained conditions with experimental results. The proposed model is capable of capturing the essential features of response in saturated clay, including anisotropy and degradation. | |||
TO cite this article:YANG Zhaohuan,WANG Jianhua. A Simple Anisotropic Bounding Surface Model for Saturated Soft Clay Considering Degradation under Cyclic Loading[OL].[10 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4728921 |
2. Meso-experimental Research on the Initiation Process of Shear Band in Red Clay | |||
LiuXin,Hong Baoning | |||
Civil and Architectural Engineering 03 June 2016 | |||
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Abstract:By using reconstructed Microcosmic Test System, and via the shear experiment on red clay in different water content rate and compaction degree, study the regularity of the inside micro-structure change of red clay in the process of initiation of shear band. The study demonstrates that: the process of red clay shearing includes the initial loading stage, the local deformation development stage, and the destruction stage. The initiation and development of shear band are at the anaphase of local deformation development stage, which is toward peak of stress. The process of initiation of red clay shear band could be described through the variation of fissure area ratio(FAR), fissure distribution fractal dimension(FDFD), roundness of particles(ROP) and particle orientation degree(POD). With the axial strains increasing, the FAR gradual increased, FDFD began to fluctuate in a narrow range and then increased gradually, ROP was steady at early stage, subsequently decreased, and then stable in the later stage, POD decreased gradually. Compared with lower Moisture Content, the red clay shear band with higher moisture content postponed the initiation time, the equal axial strains corresponded lower FAR and FDFD, as well as the POD and the initial value of ROP were both smaller. Along with the compactness increasing, FAR, FDFD, and ROP changed slightly, showing that interaction force between particles did not depend exclusively on extrusion and bite forces, and further illustrated the particularity of free oxides in red clay. Under high compactness, POD increased firstly and then decreased, while when compactness was low, POD showed digressive trend. | |||
TO cite this article:LiuXin,Hong Baoning. Meso-experimental Research on the Initiation Process of Shear Band in Red Clay[OL].[ 3 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4694419 |
3. Mesoscopic Uniaxial Compression Test Research on Initiation Process of Shear Band in Cemented Soil | |||
Liu Xin,Hong Baoning | |||
Civil and Architectural Engineering 27 May 2016 | |||
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Abstract:By using reconstructed Microcosmic Test System, and via the uniaxial compression test on cemented soil in different cement content, compaction degree, and age, study the regularity of the inside micro-structure change of cemented soil in the process of initiation of shear band. The study demonstrates that: the process of cemented soil shearing includes the initial loading stage, the local deformation development stage, and the destruction stage. The initiation and development of shear band are at the anaphase of local deformation development stage, which is toward peak of stress. The process of initiation of cemented soil shear band could be described through the variation of fissure area ratio (FAR), fissure distribution fractal dimension (FDFD), particle orientation degree (POD) and particle distribution fractal dimension (PDFD). In the shear failure process of cemented soil, the change of parameters (FAR, FDFD, POD, PDFD) also could be divided into three phases on the basis of shear band's initiation, development and breakthrough. With the axial strains increasing, the FAR gradual increase, FDFD presents a slight downward trend and then increased gradually, POD decrease gradually, PDFD presents a slight upward trend, and subsequently decreased. All the parameters (FAR, FDFD, POD, PDFD) are stable in the later stage. The process of uniaxial compression test is the process of gradual consolidation, and is the process of shear band's initiation, development and breakthrough. | |||
TO cite this article:Liu Xin,Hong Baoning. Mesoscopic Uniaxial Compression Test Research on Initiation Process of Shear Band in Cemented Soil[OL].[27 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4694588 |
4. Numerical study on mechanical behavior of DRC segment for shield tunnel | |||
ZHANG Wenjun,JIN Mingming,SU Ren,KOIZUMI Atsushi | |||
Civil and Architectural Engineering 09 May 2016 | |||
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Abstract:DRC (Ductile cast iron segment and Reinforced Concrete) segment has been widely used in the projects, because it performs high capacity in the lining of underground drain shield tunnels which is subjected to high inner water pressure and is used to prevent waterlogging. Generally, combined bending, axial and shear forces will occur in the composite segment under inner water pressure. But it is difficult to clarify and understand the mechanical behaviors of DRC segment all by experiments. Therefore, the numeric calculation model of DRC segment under inner water pressure were established in this paper by using numercial method based on the existing laboratory tests. And the mechanical behaviors of DRC segment were investigated with the help of numerical simulation. Comparisons between analyzed and experimental results indicate that the proposed numerical model can effectively simulate DRC segment under inner water pressure and is suitable for general analysis of DRC segment. And the results can provide some references for the design and construction of similar composite segment. | |||
TO cite this article:ZHANG Wenjun,JIN Mingming,SU Ren, et al. Numerical study on mechanical behavior of DRC segment for shield tunnel[OL].[ 9 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4688085 |
5. Study on Mechanical Model of DRC Segment for Shield Tunnel | |||
ZHANG Wenjun,Zhang Gaole,JIN Mingming,KOIZUMI Atsushi | |||
Civil and Architectural Engineering 09 May 2016 | |||
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Abstract:The composite segment has been used in the deep, long large, and multi-cross-section shield tunnels of the subway, underground road, underground pedestrian passage and underground reservoir, etc. However, the mechanical behaviors of the composite segment are not clarified because the structural type is complicated, and the selected structure model and parameters are not reasonable. Compared with the closed-composite segment, DRC segment without top skin plate has quite different mechanical performance since the skin plate plays a significant role in closed-composite segment. Considering confined effect, interface slip and a stiffness reduction method was proposed to establish the structural model of 5-face composite segment in this paper. The proposed method can be used to solve the coupling of multi-material and multi-scale, and are suitable for a rational design of the composite segment because of improving the convergence of computations and having high precision and clear physical significance. | |||
TO cite this article:ZHANG Wenjun,Zhang Gaole,JIN Mingming, et al. Study on Mechanical Model of DRC Segment for Shield Tunnel[OL].[ 9 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4688055 |
6. Failure Behavior of Jointed Rock Mass under Shear Test | |||
LI Yong,ZHOU Hao,ZHU Weishen,LI Shucai,LIU Jian | |||
Civil and Architectural Engineering 28 November 2015 | |||
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Abstract:Large amounts of faults, joints and fissures were existed in rock mass. These structural planes, to some extent, remarkably reduce the strengths of rock mass, including the shear behavior. In this paper, the authors report a physical model test on jointed rock mass under direct shear stress state and also adopt a numerical method, Discontinuous Deformation Analysis for Rock Failure (DDARF), to simulate the shear failure process, the variation of stresses and displacements of some key monitoring points. The comparative analysis demonstrates that the numerical results are favorable with those obtained in the physical model test. Therefore, it is concluded that the method of DDARF could effectively simulate the shear behavior of jointed rock mass. | |||
TO cite this article:LI Yong,ZHOU Hao,ZHU Weishen, et al. Failure Behavior of Jointed Rock Mass under Shear Test[OL].[28 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4665176 |
7. Research on Jointed Rock Masses Influenced by Fissure Water Presure | |||
LI Yong,ZHOU Hao,ZHU Weishen,LI Shucai,LIU Jian | |||
Civil and Architectural Engineering 23 November 2015 | |||
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Abstract:Large numbers of cracks were included in rock masses. The initiation, extension, coalescence evolution behaviors of cracks in rock mass, and even fissure water pressure have significant impacts on the strength and stability of fractured rock mass in engineering projects. In this paper, we propose an elasto-brittle constitutive model considering fissure water pressure based on the computer code FLAC3D (Three dimensional Fast Lagrangian Analysis of Continua). This constitutive model is initially validated through a pre-cracked rock-like-material specimen in the laboratory experiments and then proved to actually simulate the initiation, extension and coalescence characteristics of cracks considering fissure water pressure in brittle fractured rock mass. It is concluded that fissure water pressure has obvious and significant effect on the strength and stability of fractured rock mass. | |||
TO cite this article:LI Yong,ZHOU Hao,ZHU Weishen, et al. Research on Jointed Rock Masses Influenced by Fissure Water Presure[OL].[23 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4665179 |
8. EXPERIMENTAL STUDY ON THE DAMAGE AND FAILURE PROPERTIES OF ROCK-LIKE MATERIAL WITH PRE-EXISTING DOUBLE FLAWS UNDER UNIAXIAL COMPRESSION | |||
ZHAO Cheng,BAO Chong,Matsuda Hiroshi,ZHAO Chunfeng,TIAN Jiashen | |||
Civil and Architectural Engineering 10 September 2014 | |||
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Abstract:Based on digital image correlation (DIC) method and self-developed code, the global strain field changing and failure properties of rock-like materials with pre-existing double flaws are experimentally studied under uniaxial compression. By theoretical analysis with linear elastic fracture mechanics (LEFM), strain approach proves to be practicable to investigate cracking process. Thus, two types of process zone are defined to discuss the specimen's coalescence evolution at different loading phase. Crack initiation, propagation, and coalescence is a process of process zone development and nucleation. DIC strain field results are studied on meso-level using strain approach. In shear coalescence mode, SPZ (shear process zone) in bridge area coalesces with each other, while TPZ (tensile process zone) grows independently. In general, the paper try to establish the link between microscopic mechanical mechanism and macroscopic mechanical response in flawed rock. Further research should be done to study the cracking process and its effect on rock strength in detail by DIC method. | |||
TO cite this article:ZHAO Cheng,BAO Chong,Matsuda Hiroshi, et al. EXPERIMENTAL STUDY ON THE DAMAGE AND FAILURE PROPERTIES OF ROCK-LIKE MATERIAL WITH PRE-EXISTING DOUBLE FLAWS UNDER UNIAXIAL COMPRESSION[OL].[10 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4609460 |
9. Liquefaction Hazard Zonation based on a Probabilistic Model of Lateral Spread Exceeding a Pre-defined Threshold | |||
LIU Fang,LI Zhen,LI Peizhen,JIANG Mingjing | |||
Civil and Architectural Engineering 24 February 2014 | |||
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Abstract:Lateral spreads have been extensively found near waterfronts after major earthquakes as a consequence of liquefied saturated sandy soils, and they posed significant detrimental effects on widely-spreading urban lifelines. This paper proposes a displacement-based procedure for liquefaction hazard zonation by using a newly-developed probabilistic model of liquefaction-induced lateral displacements exceeding a pre-defined threshold. The probabilistic function was formulated from a regression analysis on case histories of liquefaction by employing probit modeling. The procedure for generating the liquefaction hazard map with this proposed model was demonstrated through a selected case study. The comparison between the predicted probability and the field measurements indicates that the model can provide reasonable prediction particularly in cases of large deformations. The displacement-based procedure is promising, providing probability map that highlights the regions where relatively large deformations have been observed. | |||
TO cite this article:LIU Fang,LI Zhen,LI Peizhen, et al. Liquefaction Hazard Zonation based on a Probabilistic Model of Lateral Spread Exceeding a Pre-defined Threshold[OL].[24 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4586410 |
10. UH MODEL FOR SOILS AND ITS EXTENTION | |||
YAO Yangping | |||
Civil and Architectural Engineering 24 December 2012 | |||
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Abstract:Based on the relationship between the current yield surface and the reference yield surface, the UH mode has been proposed. The key feature of the UH model is the adoption of a unified hardening parameter that is independent of stress paths. To evaluate the potential peak stress ratio of overconsolidated clays, a parabolic Hvorslev envelope rather than a straight line is adopted to modify the UH model. This modification leads to more realistic predictions on highly overconsolidated clays than with a straight line in the original UH model, and is consistent with critical state soil mechanics wherein the higher peak stress ratio shown in overconsolidated clays is a result of dilatancy rather than cohesion. The UH model has been developed and extended to consider the influence of temperature. | |||
TO cite this article:YAO Yangping. UH MODEL FOR SOILS AND ITS EXTENTION[OL].[24 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4503597 |
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