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2009 International Conference on Information engineering and Computer Science, ICIECS 2009

作者： Yang, Shuai Wang, Hong Xia, Xiao-Zhou Yuan, Hong College of Civil and Transportation Engineering GDUT Guangzhou China Moe Key Lab of Disaster Forecast and Control in Engineering Institute of Applied Mechanics JNU Guangzhou China College of Civil Engineering HHU Nanjing China

ISBN: (纸本)9781424449941

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication *** hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this *** presenting author of this paper has the option to appeal this decision by contacting TPII@***.

关键词： Cracks

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Scattering of SH-wave by a shallow U-shaped tunnel

Scattering of SH-wave by a shallow U-shaped tunnel

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Joint Conference of the 2009 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications, SPAWDA 2009 and 2009 China Symposium on Frequency control Technology

作者： Chen, Zhi-Gang Key Lab. of Disaster Forecast and Control in Engineering Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9781424449507

In general, analytical solution for the scattering problem of SH plane wave by a cavity in half-space primarily focused on the circular structure case. However, the case for U-shaped cavities, which are similar to the cross-section of the tunnels, was seldom mentioned in former references. The analytical solution for U-shaped cavity in elastic half space is gained by the multi-polar coordinate system and conformal mapping method. A scattering wave function satisfying zero-stress condition on horizontal surface is constructed in the complex plane, the problem can be inverted into a set of algebraic equations to solve coefficients of the scattering wave by least square method. The numerical examples of the dynamic stress concentration around U-shaped cavities and ground motion on subsurface U-shaped cavity impacted by SH-wave are given. The influences of the incident wave number, angle and depth are discussed. The research indicates that the shallow U-shaped tunnel has significant impact on wave propagation, and interaction between the U-shaped tunnel and the horizontal surface will complicate characteristics of ground motion, and will bring about great increase on dynamic stress around cavity. In this situation, enough attention should be paid on the interaction between the subsurface cavity and the horizontal surface in the seismic design of ground and underground structures. © 2009 IEEE.

关键词： Wave propagation

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Analysis of optical transmission characteristics in the waveguide of side polished fiber

Analysis of optical transmission characteristics in the wave...

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2009 International Conference on Optical Instruments and Technology, OIT'09

作者： Zhe, Chen Zuping, He Fei, Cui Yating, Xiao Jun, Zhang Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education Jinan University 510632 China Key Lab. of Optoelectron. Info. and Sensing Technologies of Guangdong Higher Educational Institutes Jinan University Guangzhou 510632 China Department of Optoelectronic Engineering Jinan University Guangzhou510632 China

ISBN: (纸本)9780819478948

According to the experimental results of side polished fiber (SPF), a three dimensional optical waveguide model with longitudinal side polished transition zones is built. Based on the model, characteristics of optical transmission are calculated and analyzed by three dimensional finite differential beam propagation method. The model describes the optical transmission characteristics because the calculation based on the model is fitted well with the experiments. The calculation shows that the length of side polished area affects the optical attenuation of optical fiber, but the attenuation does not increased monotonically with the length when the length is less than certain value. The relationship between optical attenuation of SPF and the thickness of residual side polished cladding is not a monotonie one as well. The refractive index of overly on the side polished area has much more effect on the optical attenuation. Both width and thickness of overlay on the side polished area cause the oscillated change of optical power attenuation in the fiber core. © 2009 SPIE.

关键词： Light transmission

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Outburst orientation of sandstone under gravitational field

Beijing Keji Daxue Xuebao/Journal of University of Science a...

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Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing 2009年第12期31卷 1487-1491+1502页

作者： Guo, Chen-Ye Xian, Xue-Fu Li, Xiao-Hong Yao, Wei-Jing Jiang, Yong-Dong Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Chongqing University Chongqing 400030 China

The characters of outburst sandstone in rocks from Yongchuan Coal Mine were studied on the base of experimental investigation on its physical and mechanical properties. The outburst orientation of sandstone at the -350 m horizontal in this coal was analyzed and the criterion of outburst orientation was proposed. The results show that outburst sandstone has the physical characteristics of big porosity and big blowhole volume, and the mechanical characteristics of low Young's modulus, low strength, and not easy to produce plastic deformation. The launch process of rocks and gas outburst has uniformity with the rockburst characteristic, and the rockburst theory can be used to study the outburst orientation of sandstone, which depends on many kinds of factors. In these factors the mechanical factor is primary. The assessment method of outburst orientation of sandstone was established based on the energy criterion, strength criterion, and impact orientation criterion.

关键词： Sandstone

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Scattering of SH-wave by a shallow U-shaped tunnel

Scattering of SH-wave by a shallow U-shaped tunnel

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SPAWDA Symposium on Piezoelectricity, Acoustic Waves, and Device Applications

作者： Zhi-gang Chen Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Department of Mechanics and Civil Engineering Jinan University Guangzhou China

Summary form only given. In general, analytical solution for the scattering problem of SH plane wave by a cavity in half-space primarily focused on the circular structure case. However, the case for U-shaped cavities, which are similar to the cross-section of the tunnels, was seldom mentioned in former references. The analytical solution for U-shaped cavity in elastic half space is gained by the multi-polar coordinate system and conformal mapping method. A scattering wave function satisfying zero-stress condition on horizontal surface is constructed in the complex plane, the problem can be inverted into a set of algebraic equations to solve coefficients of the scattering wave by least square method. The numerical examples of the dynamic stress concentration around U-shaped cavities and ground motion on subsurface U-shaped cavity impacted by SH-wave are given. The influences of the incident wave number, angle and depth are discussed. The research indicates that the shallow U-shaped tunnel has significant impact on wave propagation, and interaction between the U-shaped tunnel and the horizontal surface will complicate characteristics of ground motion, and will bring about great increase on dynamic stress around cavity. In this situation, enough attention should be paid on the interaction between the subsurface cavity and the horizontal surface in the seismic design of ground and underground structures.

关键词： Scattering Stress Surface waves control engineering education Civil engineering Conformal mapping Wave functions Equations Least squares methods

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Notice of Retraction: The Numerical Simulation of Crack Propagation without Re-Meshing

Notice of Retraction: The Numerical Simulation of Crack Prop...

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International Conference on Information engineering and Computer Science (ICIECS)

作者： Shuai Yang Hong Wang Xiao-zhou Xia Hong Yuan Coll. of Civil & Transp. Eng. GDUT Guangzhou China Key Lab. of Disaster Forecast & Control in Eng. Inst. of Appl. Mech. Guangzhou China

This article has been retracted by the publisher.

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Theoretical model and numerical analysis on unsaturated expansive soil slope during digging and climate change courses (II)-numerical analysis

Theoretical model and numerical analysis on unsaturated expa...

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12th International Conference on Computer Methods and Advances in Geomechanics 2008

作者： Chen, Zheng-Han Lu, Zai-Hua Guo, Jianfeng Fang, Xiang-Wei Zhou, Hai-Qing Logistic Engineering University Chongqing China Key Lab. for the Exploitation of Southwest Resources Environment Disaster Control Engineering Ministry of Education Chongqing 1 China Navy University of Engineering Wuhan China

ISBN: (纸本)9781622761760

In order to investigate the sliding mechanism and process of expansive soil slope during digging and raining-evaporating courses, a FEM program named UESEPDC was designed based on the elasticity-plasticity-damage constitutive model and the elasticity-plasticity-damage consolidation model of unsaturated expansive soil proposed by the authors, and the numerical analysis on solid-liquid-gas tri-phases and multi-field couple problem was conducted for four stages: Raining and evaporating before digging;The moment at digging finishing;Three days after digging finishing;Multi- raining-evaporating cycles. The fields of stress, displacement, pore water pressure, pore air pressure, water content and suction in an expansive soil slope were obtained, and the pictures of crack damage evolution and plastic zone development in the same expansive soil slope for each analysis stage were shown. The research results clearly reveal the mechanism of expansive soil slope sliding progressively.

关键词： Numerical analysis

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Fracture mechanics solution for control fissures in perilous rock under seepage stress

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Chongqing Jianzhu Daxue Xuebao/Journal of Chongqing Jianzhu University 2008年第5期30卷 77-80页

作者： Chen, Hong-Kai Zhang, Yi Institute of Geotechnical Engineering Chongqing Jiaotong University Chongqing 400074 China Key Lab. for the Exploitation of Southwestern Resources and Envir. Disaster Control Eng. Min. of Ed Chongqing University Chongqing 400044 China

Crack propagation of control fissures in perilous rock under loads is a key process in the failure of perilous rock. Based on the loading mechanism, the control fissures are classified into compression-shear and tension-shear types. By introducing a model of seepage stress, the calculating principle of the stress intensity factor and the propagation orientation of control fissure under seepage stress are put forward using fracture mechanics methods. Using Shoulishan perilous rock in the Wanzhou district of Chongqing, P.R. China, as an example, the calculated results show that there is an obvious increase of the stress intensity factor. The influence of hydrostatic pressure and hydrodynamic pressure also are analyzed.

关键词： control fissure Fracture mechanics Perilous rock Rock mechanics Seepage stress Stress intensity factor

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Influence on strength characteristic of pile-soil composite with different moisture content

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Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences 2008年第SUPPL.期35卷 49-53页

作者： Liao, Hong-Jian Zhang, Xin-Shan Li, Zhen-Dong Key Lab. for Exploitation of Southwestern Resources and Environ. Disaster Control Eng. Chongqing 400044 China Dept. of Civil Engineering Xi'an Jiaotong Univ. Xi'an 710049 China China Northwest Building Design Research Institute Xi'an 710003 China

Based on the fact that the physical and mechanical parameters of soil surrounding the foundation pile will change due to compacting effect of the pile, a series of direct shear tests on composite of concrete specimen and soil with different moisture content are performed with an improved direct shear apparatus. The relations between shear stress and strain of the composite as well as the effect of soil moisture content on the strength characteristic of the composite are studied. Based on the theory of cavity expansion, the elastic-plastic stress and strain formulas of the soil surrounding the pile are derived. According to the laws of variation of strength index with moisture content, the effect of moisture content on the radius of the plastic zone and the stress state of soil surrounding the pile are analyzed, which can be referenced in the engineering practice.

关键词： Piles

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Modeling experiment on developing processes for debris flow on slope

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Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences 2008年第SUPPL.期35卷 130-134页

作者： Chen, Hong-Kai Xian, Xue-Fu Tang, Hong-Mei Wang, Quan-Cai Zhang, Yu-Ping Key Lab. For Exploitation of Southwestern Resources and Environ. Disaster Control Eng. Chongqing Univ. Chongqing 400044 China Department of Geotechnical and Geological Engineering Chongqing Jiaotong Univ. Chongqing 400074 China Chengdu Institute of Mountain Hazard and Environment Chinese Academy of Sciences Chengdu 610041 China

Based on dynamic geomorphology, general developing model for debris flow on slope was put forward. Further, in views of scale similarity, model soils and pricipitation devices, one semi-quantitative-qualitative experiment model was established, meanwhile, the experiment schedule was clarified. Precipitation durations vary 140-300 minutes, and it belongs to the previous precipitation stage from beginning to 70 minutes, rainfall velocity is below 1.5 mm/min, while the intense precipitation stage after 115 minutes, rainfall velocity is controlled in 2.5-5.0 mm/min. Experimental results identify five stages for developing processes of debris flow on slope, i.e., soil strength attenuation after sorping water, soil creep deformation, local sliding, flow and deposit. Physical behaviours every stages are discussed in detail, and some necessary mechanical principles are suggested in future mechanical analyses for every stages.

关键词： Geomorphology

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