bluuebunny/crossref_metadata_2025 huggingface dataset:
Test and Precision Analysis of Ranging of Reflectorless Total Station
Authors: Zhao Ya Hong , Xue Hai Tao , Zhang Li Hua
Published: June 2012

This paper introduces the basic features and the performance of reflectorless total station. The ranging performance of Sanding KTS750R reflectorless total station is tested through lots of experiments in many ways under the condition of reflectorless, including the reflecting targets with different material property and different color, ranging in different angle of incidence different distance but also on detail point acquisition precision was analyzed., the performance index and application of reflectorless total station was evaluated in different conditions, some useful conclusions were drawn.
A Rapid and Automatic Feature Extraction Method for Artificial Targets Used in Industrial Photogrammetry Applications
Authors: Liu Jian Wei , Jiang Zhi Qiang , Hu Hao , Yin Xin
Published: June 2012

Distributing artificial targets on the object to be measured is a reliable and common method for achieving optimum target location and accurate correspondence among multi-view images, which are universally adopted in industrial photogrammetry applications. In this paper artificial circular un-coded targets and coded targets are used as reference points, an automatic and rapid algorithm for reference point detection is proposed. Targets are extracted from the images according to their size, shape, intensity , etc. An improved method to identify the ID of the coded target is proposed. The gray scale centroid algorithm is applied to get sub-pixel locations of both un-coded and coded targets. Practical examples show that the algorithm can identify and locate artificial targets in images quickly and accurately. It is robust to the change of projection angles and noise.
Experimental Research on Technology of Medium Deep Hole Blasting in Large Inclination Rock Diphead Roadway
Authors: Meng De Jun , Yang Ren Shu
Published: June 2012

For improve the efficiency of large inclination diphead excavation, according to the actual construction of field, rock and explosives properties, parameters of smoothing blasting technology for medium deep hole blasting in large inclination rock diphead tunnel is researched, especially improved the blasting parameters of bottom hole and construction technology, present technologies of double bottom hole and casing for disblocking. Experimental study has obtained the good blasting effect, utilization ratio of blasting hole achieved 89.0% on average.
The Trial Research of Soil-Water Characteristic Curves of Unsaturated Soil and its Engineering Application
Authors: Liu Cui Ran , Guo Jin Jun
Published: June 2012

With the improved triaxial equipment, the tests of research of the relationships between matrix suction and water content are performed And based on the test data, the curves between matrix suction and water contents under different confining pressures are drawn and the change rule between them are analyzed. And then the function between them is simulated out. Through the soil-water characteristic curve, the permeability coefficient of unsaturated soil can be calculated and the shear strength of unsaturated soil can be predicted. These results are important to research the engineering properties of unsaturated soil.
Research on Fast Construction Technology of East Roadway in HuaHeng Coal Mine
Authors: Li Ting Chun , Wang Qun
Published: June 2012

By analyzing various factors which influence and constraint roadway construction speed in huaheng coal mine, some improved technical measures about fast construction are introduced, such as improve blasting technology, choose appropriate rock breaking equipment and improve the fast construction supporting facilities, select the right support patterns and scientific construction organization management. Take east roadway in huaheng coal mine as example, there are three key aspects: the method of mucking and haulage, drilling and blasting techniques and supporting technology. In solving the problem of loading and transport, some mechanized equipments such as LW150C bucket loader, SSD(B)20 shuttle mining car and CMJ17A full-hydraulic excavating jumbo are used, and the mechanized organization such as loading, transfer, transport and unloading is innovated. By improving bolt installation construction technology and optimizing construction management to achieve simultaneously operating of multiple procedure, increase drilling speed and shorten mucking time, which improved the roadway excavation speed and security significantly.
Study on Weak-Disturbance Construction Technology of Casing Bored Pile
Authors: Liu Deng Ke , Huang Yao Dong , Gong Quan Mei
Published: June 2012

Aiming at reducing the influence caused by the pile foundation construction on the existing structures nearby, this paper introduces a new technology of spinning casing bored pile, which is the optimization and combination of different construction technologies. Through the corresponding calculation and analysis, the influence scope and extent of this technology is obtained in this paper. This technology has been successfully applied in the pile foundation engineering of a passenger dedicated line close to subway shield tunnels, it can provide the similar project that needs to consider the influence on the surroundings with reference, and it is worth wide promotion and application.
Freeze-Thaw Cycle under the Conditions of Creep Tests of Plastics Geogrid
Authors: Wang En Liang , Zhang Bin , Chang Jun De
Published: June 2012

Through testing the creep characteristics of plastic geogrid under the temperature of 20°C，10°C，0°C and -20°C, we obtained the creep characteristics curve under the different temperature.In order to obtioning the creep regulations of plastic geogrid by freezing and thawing cycle , we made the plastic geogrid for10 times freezing and thawing cycle at -20°C - 20°C, the one which was tested under the temperature of 20°C until its deformation became stable. Conclusions: (1) The creep of the plastic geogrid under different temperatures is quite different, it is greatly influenced by temperature and the lower the temperature the smaller the creep value; freezing and thawing cycle have influence in creep characteristics,In the condition of freezing and thawing cycle,while the creep value get stable at the normal temperature, the creep value also increasing with the temperature getting high and decreasing with temperature getting low; (2) According to the creep regulations under low temperature and freezing and thawing cycle condition,we advance the counting method of impact factor of freezing and thawing cycle, DR and creep impact factor of low temperature FcR.
Large Cross Section of Very Loose Gravel Layer Inclined Construction Support Technology Research
Authors: Meng De Jun , Guo Dong Ming , Li Xiao , Wang Yan Bing , Xue Hua Jun
Published: June 2012

Very soft layer of gravel geological conditions in the mine construction has a serious impact on the efficient construction of the mine safety and personnel safety. Because the mining area where has no big development experience of the construction, the construction and development of mining face many difficult technical problems. For this passage we did some research by super support ,temporary support and permanent support technology for this problem, Ahead of the pipe roof support, U- shaped steel and backplane as the temporary support and reinforced concrete support as the permanent support of the roadway, the roadway can be passed the layer of the gravel easily. The construction technology can provide reference for the safe and efficient construction of the similar geological conditions.
Reasearch on Titanium Plate and Steel Plate in Explosive Welding Process Engineering
Authors: Huang Ping , Wang Ning Xiong , Zhou Lan Hua
Published: June 2012

The experiment was carried out and a good quality titanium-steel composite plate was obtained. In the experiment, the base plate made of Q235A and cladding plate made of TA2 titanium plate with thickness 2mm were used and explosive welding parameters were chose reasonably well which are the explosive welding clearance (h) is equal to between 0.4 to 0.6cm and the density of blasting agent in cladding plate (Wc) is equal to 6.2g/cm2. The designed titanium-steel composite board with 500×500×14mm can meet the demand in the requiement of ltrasonic inspection stretching inflection anti-shearing property in one type of National Standard of titanium-steel composite board (GB/T8547-2006)
Numerical Simulation Study on Hydraulic Blasting Based on LS-DYNA
Authors: Zhang Ya Bin , Chen Chao , Zhang Yun Peng
Published: June 2012

Adopting LS-DYNA finite element simulation, the simulation model of hydraulic blasting was established. Numerical simulation of hydraulic blasting was carried out. Through the simulation, the point that the structure wall was affected by four loading functions, which include the first shock wave, bottom reflex compression wave, the compression wave of opposite wall and the bubble pulse, was put forward. The four loading functions help to extend the time span of loading, and provide basis for principle of quasi static pressure function of hydraulic blasting.
Failure Law of Supporting Part of Reinforced Concrete Chimney by Blasting Demolition
Authors: Li Sheng Lin , Ling Tian Long , Cui Ying Wei , Yan Qian Qian , Liu Guo Fang
Published: June 2012

To study the mechanical evolution rule of the supporting part in the process of the reinforced concrete chimney blasting demolition, a finite element model based on a practical project is established by explicit analysis software LS-DYNA. By means of four different Angle blasting cut finite element models, the stress distribution of the supporting part and neutral axis moving rule is drawn. It will help to develop the theory of the reinforced concrete chimneys blasting demolition.
An Oriented Clonal Selection Algorithm for Associative Classification
Authors: Kang Wan Li , Wu Jing Jing , Cui Du Wu , Zhao Li
Published: June 2012

In this paper, we present an oriented clonal selection algorithm (O-CLONALG) for mining association rules effectively for classification. Different with the traditional evolutionary algorithms, O-CLONALG firstly scans dataset one time to find the frequent rules with one item. The items are used to generate new rules and the mutation operation is limited in it. When mutation operation takes place, each rule in the same generation was added a new item. The results have shown that it is efficient in dealing with the problem on the complexity of the rule search space. At the same time, good classification accuracy has been achieved
Hardware Design and Research of Intermittent Pressure Thrombotic Treatment Controller Based on Cortex M3
Authors: Wang Yu Ping , Zhu Hui Hong , Zhang Yi , Xue Pan Wei , Wang Jian , Sun Xiao Rong
Published: June 2012

Based on the master chip microcontroller ARM CortexM3, intermittent pressure thrombosis treatment instrument controller controls air pulse through the pump, thecushion is so quickly inflated.After each effective inflatable pressure, the controller makes automatically inflatable cushion air discharge, so the use of physical methods is to prevent and treat human venous thromboembolism, reduce venous stasis, and effectively prevent deep vein thrombosis formation.
Numerical Simulation of Wind Pressure on Different Types of Large-Span Roofs
Authors: Jia Ying , Meng Xi , Zhang Hai Jun
Published: June 2012

The geometric shape of buildings in wind field is an important influencing factor of wind pressure distribution on the buildings. Along with the change of roof shape, wind pressure distributions vary obviously. In this paper, the numerical simulation of the wind pressure for four types of large-span roofs is carried out, using CFX12.0 as computing platform. The characteristics of wind pressure distribution are studied by considering some parameters, such as wind direction, rise-span ratio, and terrain roughness. Wind pressure distribution is greatly affected by wind direction, and the wind pressure on large-span roofs is dominated by suction; the vortex shedding produced by airflow separation is the main factor affecting the characteristics of wind load.
The Simulation of Cutter-Rock Interaction in PFC
Authors: Zhao Duo , Liu Jian Qin , Guo Wei
Published: June 2012

TBM is a modern machine used in the underground engineering. This machine excavates tunnel with the cutters arranged on its cutter head. The research of the cutter-rock interaction is an important work in improving the machine's behaviour. A simulation of the interaction is presented in this paper. The effects of the rake angle, blade angle and cutting depth on cutter force and crack number in rock are discussed, which provide a complement to the cutter-rock interaction research.
Asynchronous Phenomenon of the Ring Truss Deployable Antenna
Authors: Wu Xin Yan , Luo An Ping
Published: June 2012

The deployable structure of the ring truss have advantage properties, which can be used as an effective supporting structure of deployable antenna. The deployable experiment of ring truss antenna showed that there was asynchronous phenomenon at the course of the deployment. Dynamics theory including constraint equations and considering friction factor are built firstly. Then simulation is studied systematically for the deployment process of ring truss deployable antenna. At last, the conclusions are obtained that the friction insulted in tensile forces of the cable drive decrease and the asynchronous phenomenon in the process of the deployment. It will give some help to the design and manufacture of the ring truss antenna.
Simulation Study of the Impact of Two-Stage Turbocharged System on Diesel Engine
Authors: Dong Da Lu , Zhao Chang Pu , Li Xiao Zhan , Zhu Yun Yao , Zhang Jun
Published: June 2012

With the increasing strictness of emission regulations, development direction of future diesel engines is toward the high thermal efficiency and low emissions. Supercharging technology is an important means for improving output power of diesel engines. This paper deals with the study of the two-stage turbocharging system of the non-road diesel engine. Based on GT-Power software code, a digital model of 6112 diesel engine was established. The supercharged model was calibrated by using the original experimental data. Then, four types of digital models with different two-stage turbocharging systems were constructed. The best two-stage turbocharging system was determined through investigating the impacts of different options on the performance of diesel engines. It was indicated through the study that two-stage turbocharging system can substantially increase the air flowing into the cylinder which increases the potential of power density. At the same time HC and NOx emissions can reduce. Through this study, a theoretical basis and an important reference for adopting the two-stage turbocharging system of the 6112 diesel engine were provided.
BIM Application Research Based on Cloud Computing
Authors: Bi Zhen Bo , Wang Hui Qin
Published: June 2012

Applications based on CC (cloud computing) has the potential efficient and low-cost advantages, while there are the lack of computing power, the limited range of applications and the higher cost of BIM (Building Information Model) applications in the traditional desktop mode. According to BIM application features and the actual situation, the paper starts from the concept of CC and discusses the advantages of BIM applications using CC. The system framework, the key technologies and the implementation methods of the BIM application platform based on CC have been put forward on the basis of the above discussion.
A Formal Representation of Collaborative Electronic Commerce Systems by Workflow Nets
Authors: Liu Wei , Du Yu Yue , Fu You , Yan Chun
Published: June 2012

Combining the advantages of logical workflow nets and colored Petri nets, logical and colored workflow nets and collaborative logical and colored workflow nets are presented to facilitate the modeling of cooperative electronic commerce systems. The formal representation presented in this paper can not only describe the data objects, but also represent passing value indeterminacy and batch processing function of cooperative electronic commerce systems.
CFD Simulation of Throat Pressure in Venturi Scrubber
Authors: Ali Majid , Yan Chang Qi , Sun Zhong Ning , Wang Jian Jun , Rasool Athar
Published: June 2012

In nuclear power plant (NPP), particulate matter and gaseous pollutant release into the environment in severe accidents. To prevent from this disaster, filtered vented containment system (FVCS) containing venturi scrubber is being installed. The present work herein is the CFD simulation of throat pressure in venturi scrubber. A commercial software ANSYS CFX tool has been selected for this research. Euler-Euler regime is used to get the picture of behavior of fluid dynamics inside the venturi scrubber. Gas and liquid interact with each other in throat section of venturi scrubber. The pressure at the throat is one of the important factors to analyze the performance of venturi scrubber. In order to verify the results, mesh independency is checked. CFX and experimental results show good agreement with each other. The results obtained from CFX simulation are useful to improve the venturi design.
Study on Highway Safety Simulation Evaluation Model and Method
Authors: Wei Yong Qiu , Li Li Ping , Yang Hong Zhi
Published: June 2012

We analyzed the characteristics of highway simulation system; established framework for a Multi-Agent based simulation system, and identified the construction framework for the highway safety simulation model. Through constructing computer simulation models – vehicle model, driver model, road model and barrier crash simulation model – to simulate vehicle operation on highway, we obtained quantitative indices such as operating speed, acceleration, and brake requirement, and evaluated highway design specifications. In consideration of specific highway project, we analyzed and evaluated the application effect of the simulation model in alignment safety evaluation and barrier setting safety evaluation, confirmed that the practicality of the simulation model. The result showed that computer simulation can help designers find design problems during the design period, make timely correction, and improve the scientificity and appropriateness.
Numerical Simulation Study on Quasi-Static Fracture Problem of Implicit Methods
Authors: Yu Qi Ming , Chen Yu Yang , Zhang Zhi
Published: June 2012

Implicit method is one of the most important ways of Finite element method. In this paper, finite element software are used for the CTOD test specimens to simulate the characteristic values, then compared with the experimental data to draw the appropriate conclusions.
Experimental Study on the Compressibility of Cement Improved Laterite Soil
Authors: Li Yao , Tan Yun Zhi , Jiang Jing , Xia Cheng Feng
Published: June 2012

In order to improve the mechanical property of the problem soil and satisfy the need of actual engineering construction. Cement-improved soil gradually becomes one kind of common fillings in subgrade construction. Under the soaking or unsoaking conditions, the natural soil and improved cement-soil with different compaction degree, study the compressibility of the Laterite soil in somewhere in Hunan. And also analyze its change rule of compressibility. It shows that the compression deformation of improved cement-soil reduce significantly when compared with natural soil sample; at the same condition, the larger compaction degree is, the smaller deformation of soil sample will be; and the deformation of the soaked soil sample will be larger than the unsoaking ones.
Research on Bursting Liability and its Preventive Measures of -906m Deep Coal and Rock in Zhuji Coal Mine
Authors: Guo Dong Ming , Xue Hua Jun , Li Li Juan , Xue Jun Long , Li Gui He
Published: June 2012

Rock burst is a common mine dynamic phenomenon in the world, and the research on bursting liability of coal and rock is the foundation of rock burst’s prevention and treatment. This paper has a research on bursting liability of coal and rock of 11-2 coal seam which is the main coal seam of Zhuji coal mine, and through the research and analysis of coal seam burst energy index(bursting energy index, elastic strain energy index, duration of dynamic fracture) and rock seam burst energy index(bending energy index), this paper given that seam and rock in deep mining section of Zhuji coal mine has bursting liability, put forward a series of countermeasures such as the previous water injection, hole-drilling method, blasting distressing to the coal seam with the impact disaster for deep mining in Zhuji coal mine.
Mechanism Analysis and Experimental Study of Soil-Compacting by Silent Piling
Authors: Li Fu Rong , Sun Hou Chao , Wang Zhao Yu
Published: June 2012

The mechanism of soil-compacting effect by silent piling is analyzed, and based on large-scale model box test, using soft clay of typical sites in Yancheng District, taking the single pile as the study objects respectively, and studying the soil compaction effects with the process of sinking into the single pile, analyzing the variation law of the soil deformation and pore water pressure while sinking into the single pile. The results shows that the greater the radial distance, the smaller of soil compaction effect, the influence scope of soil compaction effects on the displacement and pore water pressure reaches 0.6 times and 0.5 times the pile length sinking the single pile, which is accord to the actual engineering. The results could guide the pile foundation construction on soft soil.
Study of Low Strength Pile Composite Foundation Deformation & Stability Calculation Method
Authors: Guo Chao , Xiao Shi Wei , Chen Ze Lian
Published: June 2012

A group of deformation and stability calculation equations on the low strength pile (LSP) composite foundation is deduced from the LSP composite foundation deformation model. The stress-strain compatibility equations are yielded, in which the interactions among the pile, soils and cushions are considered. At the same time, the pile-soil stress ratio and the equal-settlement-surface (ESS) analytical solution are also yielded. Furthermore, the pile and its surrounding soil stress distribution regulation, compression deformation, the up- pricking-deformation of the cushion and the under-pricking-deformation of the subsoil are all obtained. Through the summary of the composite foundation subsoil settlement and the soil among piles compression deformation, the whole settlement of the composite foundation is deduced. In the above equations, the pile stability and flexibility are analyzed using elastic foundation beam theory. The methods put forward here can be a significant reference for the future research and design of the LSP composite foundation.
Hierarchical Genetic Algorithm for Soil-Nail Bracing
Authors: Zheng Shan Suo , Li Zhi Qiang , Tao Qing Lin , Han Pei Chao
Published: June 2012

Hierarchical genetic algorithm (HGA) are widely used in most engineering, this paper aims to propose an optimization model of soil-nail bracing by application the hierarchical genetic algorithm. In the process of optimization, soil nailing cost is setted as the objective function and the internal overall stability of the soil nailing is setted as primary controlling factor. Finally, an example is cited to verify the optimization model. By comparison the traditional genetic algorithm with the HGA, it is concluded that HGA optimization model of soil-nail bracing gets better economic effect.
Determination of Mechanical Parameters of Reservoir Landslide Based on Back Analysis Using Evolutionary Artificial Network
Authors: Meng Fan Zhen , Li Shao Jun , Zhang Zhen Hua
Published: June 2012

Back analysis of displacement is an effective method for parameter recognition in geotechnical engineering. As rock and soil are complex geological materials, the relationship between the mechanical parameters of slope sliding mass and its displacement is incompletely quantified and highly nonlinear, but traditional back analysis of displacement has poor adaptability for this. So in this paper an integrating method of genetic algorithm, neural network and numerical analysis (GA-NN) is presented to carry out back analysis for mechanical parameters of slope sliding mass, and procedures to perform the intelligent back analysis are described in detail. Finally, this new method is applied and verified by a practical landslide in the reservoir area of Three Gorges, the results indicate the method is efficient for determination of mechanical parameters of sliding mass.
Effect of Soil Stiffness on Bearing Characteristics of Large-Diameter and Super-Long Steel Pipe Pile Based on FLAC3D
Authors: Zhang Ming Yuan , Gao Hong Yuan , Li Yan , Song Hua Zhu , Peng Wen Tao
Published: June 2012

In recent years, more and more large-diameter and super-long steel pipe piles are widely used in bridge and port engineering. But so far, people know very little about their bearing characteristics and there is no suitable calculation method of their bearing capacity in the design specifications. In engineering design, computational theory of ordinary piles is referenced. We all know that carrying capacity of large-diameter and super-long steel pipe piles is very closely related to the surrounding soil stiffness, but we do not know how they influence each other. In the paper, the effect of soil stiffness on vertical bearing and settlement features are studied for large-diameter and super-long steel pipe pile based on the three-dimensional continuum medium fast lagrangian method (FLAC3D). The result shows that the settlement of pile top will be reduced and side friction resistance of large-diameter and super-long steel pipe pile can be increased effectively if the stiffness of soil around the piles become stronger under the unchanged load. But when the stiffness of soil exceeds a certain intensity, the rate of pile top settlement reducing decreases gradually. In other words, when the soil stiffness increases to a certain extent, continue to increase the stiffness of soil around piles can not effectively reduce the settlement of pile top. It is obvious that the stiffness of soil around pile has a direct impact on the pile settlement characteristics and bearing characteristics. The conclusion is of significance for the reasonable design of large-diameter and super-long steel pipe pile foundation in engineering applications.
Unified Solution of Coulomb’s Active Earth Pressure for Unsaturated Soils without Crack
Authors: Liang Wen Biao , Zhao Jun Hai , Li Yan , Zhang Chang Guang , Wang Su
Published: June 2012

Based on the unified solution of shear strength in terms of double stress state variables for unsaturated soils, whilst considering the effect of the intermediate principal stress rationally, the unified solution of Coulomb’s active earth pressure for unsaturated soils without cracks is developed. Comparability of the solution is analyzed and influencing characteristic of each factor is obtained. The research result indicates that: the intermediate principal stress and matric suction have obvious impacts on Coulomb’s active earth pressure for unsaturated soils; Coulomb’s active earth pressure has been decreasing until zero with the increase of unified strength theory parameter and matric suction; Coulomb’s active earth pressure increases with the increase of grading angle of retaining wall and slop angle of backfill, but decreases with the increase of matric suction, effective internal friction angle and matric suction angle, while external friction angle has no obvious influence. The proposed unified solution of Coulomb’s active earth pressure enjoys a wider application, and unified solution of Rankine’s active earth pressure is just the special case. The results are of great significance to soil pressure determination such as slope and foundation pit, and to retaining structures design.
Dynamic Compaction and Compaction Grouting for Dewatering in Pit
Authors: Wang Shu Li , Chen Dun Wu , Mu Man Gen , Zhang Yao Yu
Published: June 2012

China University of Geosciences (Beijing) has developed a dynamic compaction and compaction grouting (DCCG) method for groundwater flow control in Dalian. This method has been proven effective in dramatically reducing permeability in plain fill soil, and in granular or porous media. It has been successful used in many applications dealing with deep pit by coast. This paper presents the DCCG that has particular relevance in today’s pit construction marketplace by coast. Permeability can be improved by means of the DCCG. A brief introduction to the technique is followed by discussion of recent advances, illustrated by case studies of applications
The Application of Riprapping for Sludge Extrusion in Foundation Treatment in Reclamation and Sludge Areas
Authors: Kou Hai Lei , Zhang Ming Yi , Shan Ying Tao
Published: June 2012

This paper firstly expounds the scope and principle of riprapping for sludge extrusion, and then details of quality control standard of the construction technology and process are described according to the engineering practice. The points of subsidence, surrounding upheaval, deep horizontal displacement, and pore water pressure are also monitored respectively set in hydraulic fill mud area. The monitoring data are analyzed for conclusion to explore the feasibility and existing problems of riprapping for sludge extrusion in this experiment.
Economic and Technical Analysis of Thick Coal Seam Mining Methods
Authors: Zhao Xiang Min , Yang Peng
Published: June 2012

Common mining methods for thick coal seams or extremely thick coal seams has slice mining top coal caving mining, greater height mining, and surface mining. From the perspective of economic and technological mining method, the choice of methods should be fully taken into account the technical, economic, quality of operating personnel, equipment, geological conditions. It allows priority to open-pit mining, and then according to the thickness, coal quality, coal other factors to select the top coal caving or mining of high extraction methods which can achieve the economic, security, and efficient purposes. Conversely, if the method is poor choice, it will certainly lead to economic and time losses.
Based on the Strength Reduction Slope Stability Finite Element Analysis of Engineering Examples
Authors: Li Peng Fei , Liu Hong Bo , Zhang Yu
Published: June 2012

The strength reduction method is applied in the analysis of slope stability, strength reduction, into the finite element program for calculating, until computations convergence. Combined with the engineering example, comparison of slope stability finite element method and the traditional limit equilibrium method the results show that, based on the strength reduction finite element analysis of slope stability is feasible.
The Thermal History of the Hukeng Granite Body in Jiangxi Province, South China
Authors: Liu Jun , Guan You Fei , Zhan Yong , You Hai Jiao
Published: June 2012

The Hukeng granite body locates in southeast limb of Wugongshan compound anticline, where developed large scale tungsten deposit that is an important part of poly-metallic metallogenetic belt in South China. The thermal history of the Hukeng granite has been studied based on zircon U-Pb dating, whole rock Rb-Sr dating and K-Ar dating of muscovite from the same rock body. From the beginning of zircon crystallization to the closure of whole rock Rb-Sr system, the Hukeng granite body had a relatively fast cooling rate (65°C/Ma), and from the closure of whole rock Rb-Sr system to the closure of K-Ar system of muscovite, the granite body had a very fast cooling rate (208.3°C/Ma). The Hukeng granite body had a very short cooling period (<5Ma) and experienced a rapid cooling process.
Properties of Artificial Lightweight Aggregates (ALAs) Made of Dredged Soil Mixed with Waste Catalyst Slag
Authors: Jo Si Nae , Kim Yoo Tack , Kang Seung Gu , Kim Chang Sam
Published: June 2012

The artificial lightweight aggregates (ALAs) were manufactured using dredged soil produced at thermal power plant and waste catalyst slag by direct sintering method at 1050~1250°C for 10min. The ALAs of 100% dredged soil showed the black core phenomenon even at the low sintering temperature as 1050°C and become lightened by bloating pores in black core area with sintering temperature. On the other hand, the aggregates with 100% waste catalyst slag did not showed black coring and bloating phenomenon and had the low forming ability and many cracks inside. Adding the dredged soil to the waste catalyst slag decrease the specific gravity by promoting the black coring and bloating inside. The water absorption(%) of ALAs decreased with sintering temperature. The ALAs fabricated in this study showed the specific gravity of 0.8~2.0 and water absorption of 2~16% so it could be applied to various fields such as the lightweight concrete or the field of the porous carriers for purification of a contaminated soil or water.
Effects of Silica Fume Addition on the Spalling Phenomena of Reactive Powder Concrete
Authors: Tian Kai Pei , Ju Yang , Liu Hong Bin , Liu Jin Hui , Wang Li , Liu Peng , Zhao Xi
Published: June 2012

The explosive spalling of high-strength concrete due to fire is a problem that has garnered increasingly widespread attention, particularly the explosive spalling of reactive powder concrete (RPC). For years, based on the vapor pressure mechanism, the addition of fibers has been demonstrated to be somewhat effective in protecting against spalling. However, relevant experiments indicate that fibers are not effective for dense concrete, which is a challenge for the simple vapor pressure mechanism in providing spalling resistance for RPC. The authors found that silica fume plays an important role in the explosive spalling of RPC. Thus, four classes of RPCs with different ratios of silica fume were prepared, and the spalling phenomena and the inner temperature distribution during heating were investigated. The results show that silica fume content has a prominent effect on the spalling process of RPC.
Predication of GRT Fiber-Rubberized Haydite Concrete Bend Strength Based on Multiple Regression Analysis and BP Neural Network
Authors: Xia Bing Hua , Liu Yuan Cai , Sun Wei Wei
Published: June 2012

Experiment with intensity level for the LC30 ceramsite concrete as the research object, changing the content of cement, GRT fiber, rubber powder by the orthogonal test to configure GRT fiber—rubberized haydite concrete samples, maintenance samples 7d and 28d in standard conditions and respectively testing their bend strength. Through the analysis of the test data, using multiple regression analysis established the GRT fiber—rubberized haydite concrete 7d and 28d bend strength regression formulas.By means of BP neural network theory combine MATLAB programme established GRT fiber—rubberized haydite concrete 7d and 28d bend strength neural network model.Finally using 3 groups new test data to compare the value of multiple regression equations and BP neural network’s predicted value.The results indicate that the multiple regression equations of 28d’s and 28d’s BP neural network model are availabled.But because of the water and cement which in the GRT fiber—rubberized haydite concrete can not hydration reaction sufficiently during the 7d’s,so the multiple regression equations of 7d’s is unavailabled.
Fuzzy Matter-Element Evaluation of Wall Thermal Insulation Materials
Authors: Liu Jia You
Published: June 2012

Wall thermal insulation is one of the most effective ways for building energy-saving. Selecting suitable thermal insulation materials is important to energy-saving, economy, safety and durability, etc. The principle of fuzzy matter-element method is introduced as well as entropy method. The methods are use to evaluation wall thermal insulation materials to determine the most appropriate material. The performance indicators of wall thermal insulation materials are analyzed. An application case is studied using the methods, and Extruded Polystyrene (XPS) is selected to be the most suitable material.
Study on Vibratory Stress Relief of Cylindrical Welded Component with Energy-Saving and Environment
Authors: Dong Xue Wu , Han Jian Hui , Ren Dai , Mu Kai , Fu Zhi Min , Zhai Ya Fei
Published: June 2012

Cylindrical welded component is one of the typical components. It is necessary to do aging treatment for keeping stable dimension. Vibratory stress relief (VSR) is a new kind of technology which may eliminate the residual stress in metal component with high efficiency, energy-saving, environment protection and low cost compared with thermal stress relief (TSR). And the effect is greatly impacted by vibration parameter. Vibration modes are tested by modal analysis. Excitation frequency and point, support point and other parameter are determined by stress distribution and the fourth vibration mode of cylindrical welded component. Blind hole method is adopted to measure respectively component residual stress after welding and with 20 minutes of VSR treatment. Result shows that residual stress is reduced by 50% or so after VSR for cylindrical welded component. Therefore, vibratory parameters are determined by component residual stress distribution and its vibration mode. The best effect can be obtained for the technology of VSR.
Effect of Latent Heat to Solidification Process of Phase Change Material
Authors: Mao Jin Feng , Li Wei Hua , Li Yong , Wang Bo , Lou Dong Dong , Zi Dong Yi , Jiang Guo Zheng , Wang Li Jun , Sui Lu Yan
Published: June 2012

The heat transfer characteristics of heat storage unit are analyzed by many researchers from both theoretical and experimental in solidification heat release. Most theoretical models define the initial temperature of the phase change materials is equal to the phase transition temperature, in fact, thermal storage unit in the application, its initial temperature is not equal to the phase transition temperature. Many theoretical models have not considered the impact of latent heat of solidification. In this paper, homemade inorganic hydrated salt material is used as heat storage media, packaging with a cylindrical container. The phase change heat transfer process was analyzed both from theoretical and experimental. The effect of initial temperature and the latent heat of the heat transfer material were both considered.
The Effects of Admixtures on the Adobe Wall Materials' Durability
Authors: Liu Jun , Shi Jin Hu , Lin Fang Zhi , Sun Wen Hui
Published: June 2012

Objective:this paper would research the effects of different dosages of admixtures doped to the adobe wall materials' compressive strength, 30min soaking compressive strength loss rate, water resistance, water absorption rate and resistance drying and watering cycle can be modified by cement, stone powder and fly ash three admixtures which are single-doped into the samples. Result: The single-doped cement can enhance the durability of the adobe wall materials obviously. When the dosage of stone powder's single-doped is 0~5%, it can lower the 30min soaking compressive strength loss rate and water absorption rate. When the dosage of it's single-doped is 5~15%,it raises the 30min soaking compressive strength loss rate and water absorption rate. While the dosage of single-doped fly ash is increasing, it could lower the adobe wall materials' compressive strength, but other performance lowers after that first enhances,and the single-doped dosage of 5% is the turning point performance.Conclusion: Three kind of admixtures can modify the adobe wall materials' durability. When the dosage of stone powder and fly ash's single-doped are 5%,the sample's performance of water resistance is best.It meets the demands of the adobe wall materials' durability.
Square Steel Pipe Regeneration Block Party of a Concrete Column Nonlinear Finite Element Analysis
Authors: Li Bai Shou , Li Yue Hong , Zhang Ping
Published: June 2012

By testing the Axial compression performance of the Block of concrete short columns regenerated by No rib and steel ribbed thin-walled square and simulating the finite element program ANSYS calculation ,we are going to reveal the square steel tube regeneration block of mixed component axial compressive deformation and failure mode ,and analyze the longitudinal force and the strain relationship of the longitudinal direction and the horizontal direction as well as the effect on forcing performance and failure mode of specimen played by the combined concrete force of fresh concrete. The results showed that the main failure mode of specimen is crushed drum-type damage. In the elastic state, all the strain growth in the middle section and the corner is self and growth of longitudinal strain of the two is relatively consistent. On damaging stage, the specimen without ribs is softened, while the specimen with ribs shows a feature of stiffening. The results of finite element analysis fit the test results well.
Research on Toughness and Modification Mechanism of In Situ Toughening Mortar
Authors: Li Lin Xiang , Xie Yong Jiang , Feng Zhong Wei , Zhu Chang Hua , Li Shu Ming
Published: June 2012

Small molecular monomer and initiator were added to cement mixture, in situ polymerization had occurred under the action of initiator with the cement hydration, and polymer network was produced, and thus the toughness of cement paste was improved. The toughness of in situ toughening mortar had been measured through flexural/compressive ratio, and modification mechanism had been revealed through MIP, SEM and TG-DTG. The results show that, flexural/compressive ratio of in situ toughening mortar has been enhanced greatly compared with reference; Many polymer films are formed in hardened cement mortar, and hydrolysis product of polymer can react with cement hydration product Ca(OH)2. Physical adhesion between polymer films and cement hydration products and chemical bonding between polymer and cement hydration products are primary causes to improve toughness of cement mortar.
Effect of Poling Temperature on the Barium Ferrite Modified 0-3 Cement-Based Piezoelectric Composites
Authors: Huang Shi Feng , Li Mi Mi , Xu Dong Yu
Published: June 2012

A barium ferrite modified 0–3 cement-based piezoelectric composite was fabricated with piezoelectric ceramic [0.08Pb(Li1/4Nb3/4)O•0.47PbTiO3•0.45PbZrO3], sulphoaluminate cement and barium ferrite by compressing technique. It is well known that in the process of making piezoelectric composites，polarization is very critical, which is the process of domain structure's motion and development in a piezoelectric composites. Without the polarization, the composites will have no piezoelectric properties. So the influences of poling temperature on the piezoelectric and dielectric properties, electromechanical coupling property and acoustic impedance were investigated. And the poling temperature were selected at 30°C、50°C and 80°C. The results showed that the optimum poling temperature were 80°C.
Intensive Development and Comprehensive Utilization of Metallurgical Slag
Authors: Yang Shu Juan , Zhang Li Wei , Yu De Hu
Published: June 2012

With the rapid development of metallurgical industry, there are more and more accumulative and newly-generated solid waste caused by metallurgy, this paper analyses the necessity of metallurgical slag utilization and carries out the research on the current situation of utilization of metallurgical slag generated in the process of ferrous metallurgy, and finally it puts forward the design concept for the comprehensive utilization of metallurgical slag, so as to achieve the high efficient utilization of metallurgical slag.
Preparation of Bio-Oil-Phenol-Formaldehyde Resins from Biomass Pyrolysis Oil
Authors: Yi Jiang Ping , Zhang Ji Zong , Yao Si Xu , Chang Jian Min , Li Ben
Published: June 2012

Three kinds of bio-oil-phenol-formaldehyde (BPF) resins were prepared which contained 30 wt% replacement of phenol with bio-oil derived from poplar, larch and bamboo. Main component of different pyrolysis bio-oil, physical properties of different BPF resins and their plywood specimens were investigated. The results show that phenolics in bio-oil derived from poplar, larch and bamboo are 13.8653%, 14.7529% and 10.3987%. All the experimental BPF resins have similar physical properties, which comply with GB/T 14732-2006. The performance of the plywood specimens bonded with different BPF resins were larch-BPF > poplar-BPF > bamboo-BPF, all of which could achieve the demands of GB/T 9846-2004.
Performances of Belite-Rich Cement Concrete with Fly Ash and Phosphorous Slag Powder
Authors: Yang Hua Shan , Tu Sheng Jin , Jin Yin Long , Tao Wang
Published: June 2012

This paper presents the results of laboratory and outdoor exposure site studies on belite-rich cement concrete with phosphorous slag powder and fly ash. The parameters studied included strength, hydration heat, ultimate elongation, Young’s modulus, and adiabatic in temperature. The experimental results showed that belite-rich cement resulted in a higher rate of strength development of mortar and concrete at later ages when compared with that of moderate-heat Portland cement. And the hydration heat of belite-rich cement is lower than that of reference. This is due to the different phase composition of the two cements. Belite-rich cement contains less C3S but more C2S than moderate-heat Portland cement. In addition, belite-rich cement concrete with phosphorous slag powder and fly ash exhibited better performances than those of moderate-heat Portland cement concrete.
Effect of Ceramsite on the Dynamic Mechanical Properties of PVA Fiber Reinforced Cementitious Composite (PVA-FRCC)
Authors: Chen Zhi Tao , Yang Ying Zi , Yao Yan
Published: June 2012

The addition of ceramsite aimed to improve the toughness of high strength PVA-FRCC and reduce its weight. The quasi-static and dynamic compressive tests were carried out to obtain the compressive strength and the dynamic response of PVA-FRCC with the addition of ceramsite, respectively. The ceramsite can weaken the compressive strength of PVA-FRCC, the quasi-static compressive strength decrease with the increase of ceramsite volume fraction. With the increase of strain rate, the dynamic peak stress and critical compressive strain increase with different ceramsite volume fraction. At the same strain rate level, the dynamic compressive strength decrease with the increase of ceramsite volume fraction. The critical compressive strain of PVA-FRCC with 3% ceramsite volume fraction have the highest critical compressive strain at different strain rate.
Effect of Water-Cement Ratio on Carbonation and Steel-Corrosion Resistance of Recycled Concrete
Authors: Sun Ya Li , Zhu Jin Song
Published: June 2012

This paper studies the effects of different water-cement ratio on recycled concrete strength, anti-carbonation capability, and protecting reinforce steel bar capability. Select the water-cement ratio 0.6,0.55,0.5,0.45,0.4 five cases of the pilot study.It shows that: recycled concrete cube compressive strength, anti-carbonation capacity and protecting reinforce steel bar capability are less than ordinary concrete.
Study on the Preparation of Super-Light Aggregate with Sludge
Authors: Guo Kai , Yang Kun , Huang Shao Long , Ding Qing Jun
Published: June 2012

Effects of three factors including perlite, kaolin and sintering temperature on the cylinder compress strength and bulk density of super-light aggregate were studied by using the orthogonal experimental analysis. Results indicated that：the sequence order of the influence of three factors on the cylinder compress strength of super-light aggregate was: Kaolin>Sintering temperature>Perlite；while as for the order of influence of three factors on the bulk density was: Perlite>Kaolin>Sintering temperature. Based on the orthogonal experimental results, the super-light aggregate was prepared with the perlite dosage of 13%, kaolin dosage of 20% and the sintering temperature of 1200°C. The bulk density and cylinder compress strength was 335kg/m3 and 1.1MPa, respectively.