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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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PROPERTY AND METALLOGENIC CHARACTERISTICS OF ALKALI-RICH PORPHYRY IN WESTERN MARGIN OF YANGTZE PLATFORM

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Journal of central south university 1998年第2期10卷 57-60页

作者： Hu Xiangzhao (college of Resources, Environment and civil engineering,central south university of technology, changsha 410083, china) college of Resources Environment and Civil Engineering Central South University of Technology Changsha 410083 China

Ａｌｋａｌｉ－ｒｉｃｈｐｏｒｐｈｙｒｉｅｓｏｆｔｈｅｗｅｓｔｅｒｎｍａｒｇｉｎｏｆＹａｎｇｔｚｅＰｌａｔｆｏｒｍｓｐｒｅａｄａｌｏｎｇＡｉｌａｏｓｈａｎ－Ｊｉｎ－ｓｈａｊｉａｎｇｆｒｏｍｗｅｓｔｔｏｎｏｒｔｈ；ｔｈｅ... 详细信息

Ａｌｋａｌｉ－ｒｉｃｈｐｏｒｐｈｙｒｉｅｓｏｆｔｈｅｗｅｓｔｅｒｎｍａｒｇｉｎｏｆＹａｎｇｔｚｅＰｌａｔｆｏｒｍｓｐｒｅａｄａｌｏｎｇＡｉｌａｏｓｈａｎ－Ｊｉｎ－ｓｈａｊｉａｎｇｆｒｏｍｗｅｓｔｔｏｎｏｒｔｈ；ｔｈｅｉｒａｇｅ，ｔｈｅｒｏｃｋｔｙｐｅ...

关键词： petrology geochemistry alkali rich porphyry metallogenic characteristics

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Finite Element Analysis of Die Geometry and Process Conditions Effects on Equal Channel Angular Extrusion for β-Titanium Alloy

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Journal of Iron and Steel Research(International) 2012年第10期19卷 54-58页

作者： SI Jia-yong1,2, GAO Fan3, ZHANG Ji3 (1. State Key Laboratory of Powder Metallurgy, central south university, changsha 410083, Hunan, china 2. college of Mechanical and Electrical engineering, central south university of forestry and technology, changsha 410004, Hunan, china 3. High Temperature Material Research Division, central Iron and Steel Research Institute, Beijing 100081, china) State Key Laboratory of Powder Metallurgy Central South University Changsha Hunan China college of Mechanical and Electrical engineering Central South University of Forestry and Technology Changsha Hunan China High Temperature Material Research Division Central Iron and Steel Research Institute Beijing China

The finite element analysis was applied to evaluate the respective influences of die geometry and process conditions on plastic strain distribution for β-titanium (Ti-13V11Cr3Al) alloy during the equal channel angular extrusion (ECAE). It was found that optimum equal channel angular extrusion die geometry is strongly material dependent. Optimal strain homogeneity in the Ti-13V11Cr3Al alloy may be achieved at r (inner radius)=5 mm, R (outer radius)=3 mm. The equivalent plastic strain increases with increasing friction coefficient. And the better homogeneity of the equivalent plastic strain distribution can be achieved when friction coefficient value is lower. The faster the ram speed is, the lower the homogeneity of the equivalent plastic strain distribution is and the influence is slight. The back-pressure does not help to improve the plastic strain homogeneity, and the increasing temperature has a slightly favourable effect on the plastic strain homogeneity between 400 and 600 ℃.

关键词： equal channel angular extrusion finite element analysis die geometry β-titanium

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Source and location mechanism for lode gold deposits hosted in metamorphic rocks in northeastern Hunan, china

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Journal of central south university of technology 2001年第2期8卷 108-113页

作者： LIU Liang ming,PENG Sheng lin,YANG Qun zhou (college of Resources, Environment and civil engineering, central south university, changsha 410083, china) college of Resources Environment and Civil Engineering Central South University Changsha China

For understanding the source and location mechanism of lode gold deposits hosted in metamorphic rocks in northeastern Hunan, the authors analyzed the REE (rare earth elements) in ores and their host rocks, metallogenic elements in host rocks near and distant from the ore bodies, and characteristics of ore controlling structures, and deduced their genetic implication. Their geochemical features of REE and metallogenic elements suggest that they are formed by mobilization of dispersed metallogenic materials in Lengjiaxi Group of Middle Proterozoic during deformation and metamorphism process, mainly in Wulingian period. From the attributes of ore controlling structures and regularity of location of gold metallization, it is concluded that the location of gold deposits is closely related to reverse shearing. Ore forming fluids are focused on the secondary faults and extension fractures of reverse shear zones of nearly EW strike by stress driven diffusion and seismic pumping.

关键词： lode gold deposit location fluid focus seismic pump northeastern Hunan

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Influence of vibration on granular flowability and its mechanism of aided flow

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Journal of central south university of technology 2001年第4期8卷 252-257页

作者： WU Ai xiang,SUN Ye zhi,LI Jian hua (college of Resources, Environment and civil engineering, central south university, changsha 410083, china) college of Resources Environment and Civil Engineering Central South University Changsha China

Regarding flowing granular media as weak transverse isotropic media, the phase velocity expressions of wave P, wave SH and wave SV were deduced, the propagation characteristics of waves in flowing granular media were analyzed. The experiments show that vibration has great influence on granular fluidity. The wavefront of wave P is elliptic or closely elliptic, the wavefront of wave SH is elliptic, and the wavefront of wave SV is not elliptic. Wave propagation in the granular flowing field attenuates layer after layer. The theory and experiment both substantiate that the density difference is the key factor which leads to the attenuation of vibrating energy. In terms of characteristics of wave propagation one can deduce that vibrating waves have less influence on flowability of granules when the amplitude and frequency are small. However, when the amplitude and frequency increase gradually, the eccentricity of ellipsoid, the viscosity resistance and inner friction among granules, and shear intensity of granules decrease, and the loosening coefficient of granules increases, which shows the granules have better flowability.

关键词： granula media vibrating aided flow body wave mechanism

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2. 5-D RESISTIVITY TOMOGRAPHY USINGBOUNDARY INTEGRAL EQUATIONS

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Journal of central south university 1997年第2期9卷 104-107页

作者： Mao Xianjin Bao Guangshu (college of Resource, Environment and civil engineering,central south university of technology,changsha 410083,china) college of Resource Environment and Civil Engineering Central South University of Technology Changsha 410083 China

DC Resistivity Tomography is a non-linear inversion problem. So far there are mainly two kinds of inversion methods, based on the finite-element method and alpha centers method. In this paper, the disadvantages of these two kinds of methods were analysed,and a new method of forward modeling and inversion (Tomography) based on boundary integral equations was proposed. This scheme successfuly overcomes the difficulties of the two formarly methods. It isn’t necessary to use the linearization approximation and calculate the Jacobi matrix. Numerical modeling results given in this paper showed that the computation speed of our method is fast, and there is not any special requirement for initial model, and satisfying results of tomography can be obtained in the case of great contrast of conductivity. So it has wide applications.

关键词： 2. 5-D problem boundary integral equations resistivity tomography

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Experiment and mechanism of vibration liquefaction and compacting of saturated bulk solid

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Journal of central south university of technology 2001年第1期8卷 34-39页

作者： WU Ai xiang,GU De sheng,SUN Ye zhi,HU Hua (college of Resources, Environment and civil engineering, central south university, changsha 410083, china) college of Resources Environment and Civil Engineering Central South University Changsha China

The paper studies the probability of industrial application of vibration liquefaction of bulk solid from the opposite point of view, and proposing turning its harmful effects into benefits. Utilizing a new device of vibration liquefaction and by compacting saturated bulk solid, a set of additional device for experiment was designed. These experiments examined the problems related to vibration liquefaction of fine ores and tailings on the basis of DSA 1 type direct shear apparatus, including models of straight tubes, curved tubes and a sandbox. The changing properties of tailings under vibration and the mechanism of vibration liquefaction and compacting of tailings were studied, and future application of the technique to mines has been put forward.

关键词： vibration liquefaction compacting mechanism

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Experiment study on water-rock interaction about gold activation and migration in different solutions

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Journal of central south university of technology 2001年第2期8卷 105-107页

作者： DAI Ta gen, GU Li, QIU Dong sheng, XIE Wen bing (college of Resources, Environment and civil engineering, central south university, changsha 410083, china) college of Resources Environment and Civil Engineering Central South University Changsha China

The interactions on gold active and migratory quantities and rates between tuffaceous slate and solu tions with different compositions were experimentally studied at 200 ℃, 20 MPa, in a high pressure apparatus. After reaction, tuffaceous slate became light colored and soft, and its mass density reduced. The amount of gold extracted from tuffaceous slate ranges widely, from 0 027 to 0 234 μg/g. Chlorine solution may activate appreciable amount of gold, and the gold migratory rate is high enough, from 50 70% to 92 30%, which reveals that sulphur and chlorine work together in solutions to accelerate gold activation and migration, and to realize gold mineralization in favorable places.

关键词： water rock interaction activation migration chlorine sulphur gold

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Applied technique of the cemented fill with fly ash and fine-sands

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Journal of central south university 2001年第3期13卷 189-192页

作者： WANG Xin-ming,LI Jian-xiong,FAN Ping-zhi (college of Resources, Environment and civil engineering, central south Universi ty, changsha 410083, china) college of Resources Environment and Civil Engineering Central South University Changsha China

Traditional stabilization of backfilling material is done by using Portland cement. However, the high price of cement forced mining engineer s to seek cheaper binding materials. Fly ash, which is the indus- trial wast e from thermal power plant, possess the potential activity of jellification, and can b e used in cemented fill as a partial substitute for cement to reduce the fill co s t. Tests were done during the past few years in Xinqiao Pyrite Mine and Phoenix Copper Mine to determine the technology parameters and the suitable content of f ly ash. Specimens with different cement/fly/ash tailings (sands) ratios were tes ted to obtain the strength values of the fill mass based on the analyses of both the chemical composition and physical and mechanical properties of fly ash . The compressive strength of specimens with a ratio of 1∶2∶8 (cement to fly ash to tailings ) can reach 2 MPa after 90 d curing, totally meeting the requiremen t of artificial pillar and reducing the fill cost by 20%-30%.

关键词： fly ash cementing-agent cemented fill replacement

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SCGM(1,m)_c model with time-lag and its application in deformation analysis

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Journal of central south university of technology 2001年第1期8卷 40-44页

作者： LI Zhi wei 1, LI Tao 1,ZHU Jian jun 1,WANG Ren qian 2 (1.college of Resources, Environment and civil engineering, central south university, changsha 410083, china 2.Department of civil engineering, Huaqiao university, Quanzhou 350029, china) college of Resources Environment and Civil Engineering Central South University Changsha China Department of civil engineering Huaqiao University Quanzhou China

Originated in the early 1990s, SCGM(1, m ) c model has enjoyed widespread application in the fields of urban planning, society economy prediction and modal control in recent years. However, none of these applications have taken account of time lag effects in the modeling process. Aiming at overcoming the defect, the authors introduced time lag items into SCGM(1, m ) c model and developed a SCGM(1, m ) c model with time lag, then discusses in detail some principal problems in the model, such as parameters estimation, model verifying, model prediction, etc. The model was used on a real slope monitoring project and compared with the conventional SCGM(1, m ) c model. The results show an improvement of average models precision from 1.321 to 0.238 and total average of relative prediction errors from 12.41% to 7.98% when the modeling data length ranges from 29 to 48 in the slope monitoring case.

关键词：灰系统 SCGM (1, m ) c 时间落后变丑分析

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