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Preliminary study on interaction between plant frictional root and rock-soil mass

Science china(Technological Sciences) 2010年第7期53卷 1938-1942页

作者： YAN ZhiXin1’2, SONG Yun3, JIANG Ping1’2 & WANG HouYu4 1 Key Laboratory of Mechanics on Disaster and Environment in Western china (Lanzhou University), Ministry of Education, Lanzhou 730000, china 2 school of civil engineering and Mechanics, Lanzhou University, Lanzhou 730000, china 3 College of civil engineering and Mechanics, Central South University of Forestry and technology, Changsha 410004, china 4 Air Force engineering Design & Research Bureau, Beijing 100077, china Key Laboratory of Mechanics on Disaster and Environment in Western china (Lanzhou University) Ministry of Education Lanzhou China school of civil engineering and Mechanics Lanzhou University Lanzhou China College of civil engineering and Mechanics Central South University of Forestry and Technology Changsha China Air Force engineering Design & Research Bureau Beijing China

The interaction between lateral root system of woody plant and soil mass is similar to the one between shrub, herbage and soil mass, and has the effect of frictional reinforcement on slope soil. It plays an important role in reinforcing soil strength in shallow slope. Therefore, slope soil mass can be considered as a composite of soil and plant roots and the soil strength and stability of shallow slope soil mass are improved. However, current researches still remain on the level of qualitatively analyzing the relation between root and soil mass. In this paper, some exploratory researches on quantitative analysis of the interaction mechanism between root and soil mass are conducted. With the study of interaction between herbage root system (lateral root system of woody plants) and soil mass, the mechanical model of interaction between frictional root and soil mass is established. The accuracy of the model is verified by field experiments of Pinus Yunnanensis. The mechanical model provides a crucial theoretical guidance to quantitatively analyzing the interaction between plant root and soil mass; it also has certain values in application.

关键词： plant slope protection vegetation for slope protection mechanical model frictional root

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Spinning Deformation Criteria of Thin-walled Tubular Part with Longitudinal Inner Ribs

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Journal of Wuhan University of technology(Materials Science) 2006年第4期21卷 169-172页

作者：江树勇 engineering Training Center Harbin Engineering University Harbin 150001China

As a successive and local plastic deformation process, backward ball spinning was applied for the purpose of prodacing thin-walled tubular parts with longitudinal inner ribs. According to the local plastic deformation theoo,, the application of yield criterion to the spinning process and the influence of the radial spinning force component on the formability of inner ribs were analyzed. Based on yield criterion and plastic mechanics, the stable flow rule of metal material and forming criteria of the inner ribs were obtained aad conformed to the experimental results so as to contribute greatly to improving the ball spinning process and optimizing the process variables, such as the diameter of ball, the reduction in a pass and the wall thickness of tubular blank, which have a significant influenee on the formability of the inner ribs. The knowledge of the influence of the process variables such as the diameter of ball, the reduction in a pass and the wall thickness of tubular blank on the spinning process is essential to preventing the quality defects of the spun parts and obtaining the desired spun parts.

关键词： ball spinning power spinning spinning force criterion

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Thermal Insulation and Strength of Autoclaved Light Concrete

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Journal of Wuhan University of technology(Materials Science) 2011年第1期26卷 132-136页

作者：杨若冲吴智深 school of Transportation Southeast University institute of Urban engineering Science & technology Southeast University

The primary objective of this study was to develop an autoclaved light concrete （ALC） material with ultra-thermal insulation property and to investigate the relationship between its physical characteristics and mechanical properties. Through tests of dry bulk density and compressive strength, relationship of physical characteristics and mechanical properties of samples were studied, resulting in a material with ultra-thermal insulation property. Scanning electron microscope （SEM） and energy-dispersive X-ray spectroscopy （EDX） were applied to analyze the micro-morphology and elemental composition of samples. To identify the product phases, X-ray diffraction （XRD） was engaged. The test results showed that compressive strength and thermal coefficient were reduced with the increasing of aluminum powder within the mixtures. As a result the optimal thermal coefficient and compressive strength of samples were improved to 0.061 W/（m·k） and 1.2 MPa, respectively. SEM, EDX and XRD analyses showed that calcium silicate hydrate and tobermorite crystal were main resultant phases.

关键词： autoclaved light concrete ultra-thermal insulation microscopic appearance and phase analysis tobermorite crystal

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Asbestos Tailings as Aggregates for Asphalt Mixture

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Journal of Wuhan University of technology(Materials Science) 2011年第2期26卷 336-339页

作者：刘小明 school of civil engineering and architecture Central South University

To use many asbestos tailings collected in Ya-Lu highway,and to explore the feasibility of using asbestos tailings as aggregates in common asphalt mixtures,and properties of some asphalt mixtures were evaluated as well.X-ray diffraction （XRD）,X-ray fluorescent （XRF）,and atomic absorption spectrophotometry （AAS） were employed to determine the solid waste content of copper,zinc,lead,and *** properties and pavement performances of AC-25 asphalt mixture with asbestos tailings were also evaluated compared with those with basalt as *** and XRF measurement results infer that asbestos tailing is an excellent road *** properties of AC-25 asphalt mixture with asbestos tailings satisfied the related *** heavy metals and toxic pollution were detected in AAS test and the value of pH test is 8.23,which is help to the adhesion with asphalt in the asphalt *** compared with basalt,high temperature property and the resistance to low temperature cracking of AC-25 asphalt mixture was improved by using asbestos tailings as ***-service AC-25 asphalt pavement with asbestos tailings also presented excellent performance and British Pendulum Number （BPN） coefficient of surface.

关键词： asbestos tailings aggregate recycling and use asphalt mixture pavement performances

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Experimental study on the compressive behaviors of CFRP tube-encased concrete columns

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Theoretical & Applied Mechanics Letters 2011年第2期1卷 29-32页

作者： Wenbin Sun~(a) school of civil engineering,Huaiyin institute of technology,89 Beijing North Road,Jiangsu,223001,china school of civil engineering Huaiyin Institute of Technology 89 Beijing North Road Jiangsu 223001 China

Nine square concrete columns including 6 CFRP/ECCs and 3 concrete columns are prepared,which have cross-section of 200 mm×200 mm and height of 600 *** CFRP tubes with fibers oriented at hoop direction were manufactured to have 3 or 5 layers of CFRP with 10 mm, 20 mm,or 40 mm rounding corner radii at vertical edges.A 100 mm overlap in the direction of fibers was provided to ensure proper *** compression tests were conducted to investigate the compressive *** is evident that the CFRP tube confinement can improve the behavior of concrete core,in terms of axial compressive strength or axial *** results show that the stress-strain behavior of CFRP/ECCs vary with different confinement parameters,such as the number of confinement layers and the rounding corner radius.

关键词： concrete column encasement confinement compressive behavior

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Research on resolution between multi-component LFM signals in the fractional Fourier domain

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Science china(Information Sciences) 2012年第6期55卷 1301-1312页

作者： LIU Feng 1,XU HuiFa 1,2,TAO Ran 3 & WANG Yue 3 1 Department of Electronic and Information engineering,Naval Aeronautical engineering institute,Yantai 264001,china 2 The 94362 th Unit of People's Liberation Army,Qingdao 266111,china 3 school of Information Science and technology,Beijing institute of technology,Beijing 100081,china Department of Electronic and Information engineering Naval Aeronautical Engineering Institute Yantai China The 94362th Unit of People’s Liberation Army Qingdao China school of Information Science and technology Beijing Institute of Technology Beijing China

When the initial frequencies and chirp rates of multi-component linear frequency modulation (LFM or chirp) signals are close,the signals may not be distinguished in the fractional Fourier domain (FRFD).Consequently,some signals cannot be *** this paper,first,the spectral distribution characteristics of a continuous LFM signal in the FRFD are analyzed,and then the spectral distribution characteristics of a LFM signal in the discrete FRFD are ***,the critical resolution distance between the peaks of two LFM signals in the FRFD is deduced,and the relationship between the dimensional normalization parameter and the distance between two LFM signals in the FRFD is also *** is discovered that selecting a proper dimensional normalization parameter can increase the ***,a method to select the parameter is proposed,which can improve the resolution ability of the fractional Fourier transform (FRFT).Its effectiveness is verified by simulation results.

关键词： fractional Fourier transform LFM signal signal resolution

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Internet-based collaborative pseudo-dynamic testing of multi-span bridge structure

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Progress in Natural Science:Materials International 2009年第5期19卷 623-633页

作者： Dapeng Wang a, Shizhu Tiana, Xinjiang Caia, Yunlei Fan b, Yan Xiaob,c a school of civil engineering, Harbin institute of technology, Harbin 150090, china b school of civil engineering, Hunan University, Changsha 410082, china c Department of civil engineering, University of Southern California, Los Angeles, CA 90089, USA school of civil engineering Harbin Institute of Technology Harbin 150090 China school of civil engineering Hunan University Changsha 410082 China Department of civil engineering University of Southern California Los Angeles CA 90089 USA

In this paper, the first Internet-based collaborative pseudo-dynamic testing of a multi-span bridge system in china’s mainland is presented in detail, which has been carried out by the collaboration of Hunan University (HNU), Harbin institute of technology (HIT) and Tsinghua University (TU) in china’s mainland, and the University of Southern California (USC) in the USA. The prototype system of Russion River Bridge at Southern California in America is illustrated. Different testing specimens, testing equipments and substructure boundary conditions at HNU and HIT laboratories are described. A network protocol platform for collaborative pseudo-dynamic testing, called NetSLab, and some function modules developed on the use of its standardized interface are introduced. Aiming at the MTS system widely used in structural testing, two approaches are presented to implement the communication interface between NetSLab and testing equipment, respectively, studied by HNU and HIT. The integrated networked testing system and collaborative testing procedures are presented. The testing results manifest that the networked collaborative testing system with powerful capability provides a testing platform with good coordination for complex models or actual structures, and achieves remote sharing of testing equipments.

关键词： Internet-based collaborative pseudo-dynamic testing Multi-span bridge structure Network protocol platform Communication interface Remote sharing of testing equipment

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Experimental Study of Bowed-twisted Stators in an Axial Transonic Fan Stage

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Chinese Journal of Aeronautics 2009年第4期22卷 364-370页

作者： Chen Fu,Li Shaobin,Su Jiexian,Wang Zhongqi school of Energy Science and engineering,Harbin institute of technology,Harbin 150001,china school of Energy Science and engineering Harbin Institute of Technology Harbin 150001 China

Bowed-twisted stators with large camber angles have been developed to replace the conventional tandem stators in an axial transonic fan stage working at high subsonic speeds. Experimental study is carried out on both stages with tandem stators and with bowed-twisted stators. Compared to the tandem stators, the bowed-twisted stators change the distribution of the low-energy fluid and the potential high-energy fluid at the compressor outlets, reduce the endwall loss significantly, improve the aerody- namic matching of rotors and stators, and eventually increase the fan stage performances. The aerodynamic performances of the fan stage at different operating points are compared and contrasted. The results show that the transonic fan stage with bowed-twisted stators has better aerodynamic performances. It is thus suggested that the bowed-twisted stators with large camber angles be popularized into the high-loaded transonic fan designs.

关键词： large camber angle bowed-twisted stator aerodynamic performance transonic fan stage

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Quasi-nano wear mechanism under repeated impact contact loading

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Science china(Technological Sciences) 2010年第6期53卷 1583-1589页

作者： ZHU JinHua1,REN XiangHong1,2,ZHANG JianJun1,3,XU YunHua1,3 & LU ZhengXin1,4 1 State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,china 2 Xi’an Research institute of High-tech,Xi’an 710025,china 3 school of Materials Science and engineering,Xi’an University of architecture and technology,Xi’an 710055,china 4 school of Materials Science and engineering,Xi’an University of technology,Xi’an 710049,china State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an China Xi’an Research institute of High-tech Xi’an China school of Materials Science and engineering Xi’an University of Architecture and Technology Xi’an China school of Materials Science and engineering Xi’an University of Technology Xi’an China

A new quasi-nano wear mechanism (QNWM) has been proposed in this paper based on the facts of wear curve turning under high energy impact contact *** characteristic is that the wear rate of QNWM is only 1/10-1/3 that of delamination mechanism at the same energy *** diameters of wear debris and pits on the worn surfaces fall into the quasi-nanometer scale (about 50-120 nm).The necessary and sufficient conditions,which bring about the QNWM,are:(i) the nano-structure (nano-crystalline + amorphous phase) in impact contact surface layer has formed by the intensive impact strain;(ii) the delamination wear cracking in sub-surface layer must be restrained;(iii) the microcracks of QNWM are produced in amorphous phase of surface nano-structure layer rather than in nano-crystalline.

关键词： impact wear quasi-nano wear mechanism delamination wear mechanism nano-structure

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Mechanism of zonal disintegration in surrounding rock mass around deep rock engineering and its application

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Science china(Technological Sciences) 2011年第S1期54卷 221-227页

作者： ZHANG YongXing & ZHANG BoHu school of civil engineering,Chongqing University,Chongqing 400045,china school of civil engineering Chongqing University Chongqing China

The mechanical behaviors of deep rock mass are different from those of shallow rock *** cases of Jinping II Hydropower Station,the special phenomenon of zonal disintegration in the surrounding rock mass around the diversion tunnels,is *** the basis of fracture mechanics,a new strength criterion for deep rock mass is *** new nonlinear strength criterion that is relative to the rock mass rating classification can be applied to the study of the tensile failure of deep rock ***,zonal disintegration model is established,and the radius of fractured zone and none-fractured zone of deep surrounding rock mass around cylindrical tunnel are obtained,their exact positions and the evolution law of zonal disintegration of surrounding rock mass is *** validate the present model,comparison between calculation results and the experiment observation on facture and failure around underground openings is carried *** is found that the numerical simulation result is in good agreement with the experimental one on failure modes around the *** sensitivity analysis,the effects of stress condition,cohesion and the angle of internal friction on the phenomenon of zonal disintegration are ***,the present model is adopted in the analysis of the zonal disintegration in the surrounding rock mass around the diversion tunnels in Jinping II Hydropower ***,the magnitude and distributions of fractured zones are determined by numerical simulation.

关键词： deep rock mass zonal disintegration strength criteria of deep rock mass numerical simulation

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