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1. 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 |
2. 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 |
3. 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 |
4. 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 |
5. 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 |
6. The RESEARCH OF WAVELET TRANSFORAMTION USING IN THE TESTING PILE OF THE DIAMETER-EXTENDED PILES | |||
Wei ye,Youhua Fan | |||
Civil and Architectural Engineering 20 February 2006 | |||
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Abstract:Abstract: The wave impedance theory of reflection wave method and its localization were introduced. The FE models of diameter-extended piles and integrated piles with a hard soil layer surrounded were built. The wavelet transformation figures of the sampling point’s acceleration were studied when these two models were different in bug’s diameter and soil’s elastic modulus respectively. It was found that when the sampling frequency was bigger than 40 KHz, a group of wave crests in high frequency between the reflected wave of bug and the pile toe could be select to be the distinguishing character between these two models. The results can be a reference in the practice and provide a target in the inversion of the characteristic wave. | |||
TO cite this article:Wei ye,Youhua Fan. The RESEARCH OF WAVELET TRANSFORAMTION USING IN THE TESTING PILE OF THE DIAMETER-EXTENDED PILES[OL].[20 February 2006] http://en.paper.edu.cn/en_releasepaper/content/5276 |
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