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Peitao Wang,Meifeng Cai,Fenhua Ren,Changhong Li,Tianhong Yang 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.2
Anisotropy is one of the most distinct features of stratified rock mass and it must be considered in engineering design and stability analysis. On the basis of linear elastic theory and displacements equivalence, a computational model considering elastic anisotropy was established. The equivalent elastic modulus and equivalent Poisson’s ratio of the stratified rock perpendicular and parallel to the loading direction were discussed. The relations of material properties and geometry parameters with the equivalent elastic modulus and equivalent Poisson’s ratio in two directions were studied. Uniaxial compressive test was conducted and the elastic modulus and Poisson’s ratio in the proposed model agreed well with experimental results. The comparison between a comprehensive set of experimental data and theoretical analysis data proves that the proposed constitutive model can effectively characteristic the mechanical behavior of stratified rocks. The proposed model can consider the effects of material parameters and geometry parameters of rock and joints on the mechanical behavior of stratified rock mass. Moreover, the elastic anisotropy was considered in the model. Thus, the model can supply some valuable reference in studying deformation of stratified rock mass and engineering design.
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Peitao Wang,Tianhong Yang,Tao Xu,Meifeng Cai,Changhong Li 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.4
It is of great importance to study the failure process and scale effect of jointed rock mass in the field of rock mechanics and mining engineering. In the present paper, initially the uniaxial compression test on granite was performed and acoustic emission (AE) sequence was acquired during the compression process in laboratory. Results from numerical simulations using the particle flow code in two dimensions (PFC2D) were presented, and compared with experimental measurements. It was observed that the approach was reasonably good in predicting the real response of granite rock samples. The mechanical parameter of joint model was then calibrated based on PFC2D model with experimental results. Finally the mechanical properties of complex rocks with discrete fracture network (DFN) were studied and scale effects on the elasticity and strength were then investigated. The result showed that the failure pattern was similar when the ratio of joint contact bond strength (both shear and normal) to rock contact bond strength was in the range of 3~9%. The elastic modulus and strength parameters were changed with the sizes of rock sample for DFN models. Moreover, the variation of rock failure pattern under different sizes was also studied and finally the representative elementary volume (REV) size of the considered rock mass was estimated to be 9 × 9 m. It is suggested that the failure pattern analysis should be considered in the REV study of jointed rock mass.
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DI DI,PEITAO DONG,XUEZHONG WU,CHAOGUANG WANG,JIAN CHEN,HAOXU WANG,SHENGYI LI,JUNFENG WANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.4
High-ordered particle-in-bowl (PIB) arrays are developed in this paper for surface enhancedRaman spectroscopy (SERS). A heterogeneous shadow mask, composing of the chrome (Cr) layerand colloid residues, is used to fabricate the silicon (Si) template from where the PIB arrays¯nally lift-o®. The ¯nite di®erence time domain (FDTD) method is employed to investigate theRaman enhancement mechanism of this PIB architecture. The electromagnetic (EM) ¯eld tendsto concentrate in the gap between the bowl and the particle forming the \hot spots". Theenhancement factor (EF) of the EM ¯eld is about 70 with an excitation wavelength of 785 nm. The Raman measurements validate the EM calculation of the PIB arrays. The EF is about1 : 12 ? 10 7 using Rodamine 6G (R6G) as probe molecule. The proposed PIB array is high-orderedin morphology and ultra-sensitive in Raman measurement, providing an ideal substrate forSERS-based bio-chemical sensing, disease diagnosis and analytical chemistry.
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Jian Chen,Peitao Dong,Chaoguang Wang,Chenyu Zhang,Junfeng Wang,Xuezhong Wu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.11
A simple method for improving surface-enhanced Raman scattering (SERS) performance of aligned silver nanorod (Ag NR) array was investigated. This method was to construct a kind of hybrid substrate by grafting Au@Ag core–shell nanoparticles (NPs) into Ag NR array using poly(2-vinylphridine) (P2VPy) as a bridging agent. The hybrid substrate yielded excellent SERS performance as its detection limit improved from 10 -6 M to 10 -8 M using trans-1,2-bis(4-pyridyl)ethylene (BPE) as probe molecule, which was increased by two orders of magnitude compared with Ag NR array substrate. The significant improvement of SERS performance of Ag NR arrays was attributed to the addition of Au@Ag core–shell NPs. As a result of surface plasmon resonance generated by the interaction of electromagnetic (EM) (IAEM) filed between NP and NR structures, increasing hotspots were found at the connections of NPs and NRs, the gaps of adjacent rods, and the gaps of two particles consequently. These results were validated by the finite difference time domain (FDTD) calculation. Besides, hybrid substrate shows good performance in stability and reproducibility. The proposed method was simple and robust, which promoted SERS performance of Ag NR array effectively, showing great potential in the application of SERS substrate fabrication and SERS-based bio-chemical sensing.
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