bluuebunny/crossref_metadata_2025 huggingface dataset:
3D Simulation of Mechanised Excavation in Brittle Rock
Authors: Zhao Kai , Janutolo Michele , Chen Guo Xing
Published: August 2013

During the excavation by TBM of the Aicha Exploratory Tunnel along the Brenner Base Tunnel in Italy, in hard brittle granitic rocks, an instability phenomenon occurred at chainage 6+151. The left-hand sidewall lining partially collapsed for a length of approximately 60m. This led to a stoppage of the TBM lasting about 4 months. With the reconstruction of the geological model, a sub-vertical fault, not forecast at the design stage, was identified parallel to the direction of the excavation. In this paper, a three-dimensional (3D) model, which simulates the complex interaction between the rock mass, the TBM and its system components, and the tunnel support, is presented. The model accounts for the main machine components: shields, cutterhead, grippers, pea gravel and lining. The brittle failure of a thin granite diaphragm between the fault zone and the tunnel wall is reproduced and the results are discussed in terms of failure zone and horizontal displacements.
Research to the Influence of Bolt Direction on the Surrounding Rock
Authors: Zhao Yu Cheng , Lu Dan Feng , Chen Yao
Published: August 2013

Bolt design has an important role to give full play to the effect of bolt support and ensure the roadway safety. Based on numerical simulation by ANSYS software, stress - strain is no longer as the analysis object in the study, but creating the paths mapped equivalent plastic strain to observe the changes in the plastic zone. This paper studies the influence of bolt direction on the surrounding rock, and proposes a reasonable range of support direction to provide a reference for the actual bolt. The result has shown that the large oblique bolt results in the equivalent plastic strain increasing and it is not conducive to control the deformation of the surrounding rock. The best supporting direction is from-30 ° to 30 °.
Numerical Investigation on Factors Influencing the Time-Dependent Stability of the Rock Slopes with Weak Structure Planes
Authors: Li Lian Chong , Li Shao Hua
Published: August 2013

Under the combined effects of various external factors, such as temperature, seepage, alternate wetting and drying and so on, the mechanical properties of rock mass are susceptible to be deteriorated, and its strength characteristics are significantly degraded with time. The mesoscopic damage accumulated inside the rock, contributing the rock slope instability with weak structure planes, generate the time-dependent deformation, and eventually lead to the slope failure. Given the time-dependent deformation of the rock, numerical simulations are conducted to investigate the key factors influencing the long-term stability of slopes. Numerical results show that the catastrophic failure time of slopes is linear to its cohesion, and the bigger cohesion and friction angle increase catastrophic failure time, i.e., the stability of rock slope increase. In addition, the configuration of the intact rock bridge can also influence the time-dependent slope stability. Slope height can significantly affect the slope stability and the maximum horizontal displacement. Differences in rock mass storage environment play an important role in the long-term stability of slopes.
Characteristics of the Train Wind and Analysis of Personnel Safety in Intercity Railway Station
Authors: Shi Cheng Hua , Liu Qiang , Peng Li Min
Published: August 2013

Based on the 3D incompressibleequations and the standardturbulent model, taking numerical calculation as the main research method, the relative motion model of station-train was established, the air flow field environment that when a train (CRH2) ran in the intercity railway tunnel at a speed of 200km per hour was simulated. The changing process of the train wind on the platform when the train passed through the platform was analyzed, the distribution characteristics of the train wind on the platform were discussed, according to the train wind reference standards, the safety avoidance distance of people on the platform had been worked out. The results show that: the gradient of the boundary layer wind speed close to the train wall is very large; the train wind near the tail of the train is the most unfavorable position; in order to keep the personal safe, protective measures should be taken when necessary.
Lateral Response of Buried Pipeline through Three-Soil Site to Random Ground Motion
Authors: Wang Dai , Wei Zhuo Bin , Liang Jian Wen
Published: August 2013

Using the pseudo-excitation method, a simple model was built to study the seismic response of buried pipeline laid through three-soil site for vertical incidence of seismic waves. Seismic ground motions are considered as stationary stochastic processes, and the cross-PSD function was established based on auto-PSD model, coherence model, and site response model. The results show that the peak bending stress depends on the properties of adjacent soils and the width of middle-soil, and appears in the pipeline near the soil interfaces.
3D Valley Site Effect on the Nonlinear Seismic Response of Earth Dam
Authors: Li Yong Qiang , Jing Li Ping , Liang Hai An , Zou Yan , Sun Wei Feng
Published: August 2013

A three dimensional numerical model for a typical earth dam and its valley site was established and the nonlinear seismic response of this model was performed. Experimental data of cyclic triaxial tests were adopted to determine the curves of modulus ratio and damping ratio that vary with dynamic strain amplitude. Free-field artificial boundary and viscous artificial boundary were employed and the input waves were the revised ground motions obtained from the station near the dam. Distributions of the PGA, displacement, residual deformation, shear strain increment and element failure state were presented. Results demonstrate that the 3D local valley site effect has a significant influence on the seismic response of earth dam.
Influence of Hydroxyl Aluminium on the Engineering Properties of Montmorillonite Clay
Authors: Sun Shi Yong , Yao Hai Lin , Cai Dong
Published: August 2013

The influence of hydroxyl aluminium on the mechanical and physical characteristics of montmorillonite clay was examined in this study. Hydroxyl aluminium-modified and unmodified montmorillonite samples were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), hydrometer analysis, unconsolidated undrained (UU) triaxial strength tests, unconfined compressive strength tests, Atterberg limit tests, swelling potential tests and other evaluation techniques. The results indicated that the hydrophilic nature and the swelling and shrinkage properties of the montmorillonite clay changed drastically as a result of modification with hydroxyl aluminium. The free swelling ratio of the clay was reduced sharply, and its particle size gradation and strength characteristics were greatly improved by modification with hydroxyl aluminium. The proportion of clay-sized particles decreased dramatically, and the proportion of silt-sized particles increased. The results of this study suggest that hydroxyl aluminium influences the mechanical and physical properties of montmorillonite clay by physicochemical interactions.
A Research of the Seismic Energy Dissipation Effect of BRB under Frequent Earthquake in High Seismic Intensity Areas
Authors: Liao Zheng Jun , Chen Chao He
Published: August 2013

The BRB has a good seismic energy dissipation effect and it has been proved and applied to many specific projects. In this research, the GH Hotel, a high-rise building in Haikou with the seismic fortification intensity of eight degrees (0.3 g) is selected as a carrier, from which two contrast models of the 40th story with and without BRB are set up respectively. By Superposition Response Spectrum Analysis and Elastic Time-history Analysis, this study explores the seismic energy dissipation effect of BRB under frequent earthquake in high seismic intensity areas and draws some conclusions.
Study on the Analysis Model of the Self-Centering Wall
Authors: Hu Xiao Bin , Li Wen Xia , Xiang Hao , He Hui Gao
Published: August 2013

The self-centering wall including both prestressed tendons and dampers is proposed in this paper, and the corresponding general finite element numerical analysis model, simplified numerical analysis model and theoretical analysis model were established respectively, focusing on how to simulate the prestressed tendons, dampers and the horizontal connection between the wall and the foundation. The numerical simulations of the self-centering wall subjected to reversal loading were performed using the above two numerical analysis models, and the results were compared to those obtained from theoretical analysis. It is indicated that the hysteresis curve of the self-centering wall under reversal loading exhibits flag shape and no residual displacement exists after the wall is unloaded completely. The numerical analysis results match well with those from theoretical analysis, which shows the two numerical analysis models proposed in this paper can be well used to capture the mechanical behavior of the self-centering wall.
Shallow Hidden Cave Seismic Wavefield Numerical Simulation Based on Gaussian Beam Method
Authors: Liu Guo Hua , Xiao Mei
Published: August 2013

Hidden cave is one of the most common geological hazards and the seismic prospecting method is an efficient tool to detect it. Numerical simulation method is the main method of geophysical forward modeling and plays a very important role in seismic prospecting. Gaussian beam forward modeling method combines the wave equation and the ray theory closely, and it has the advantages of high efficiency and high precision. We used Gaussian beam method to simulate the seismic wavefield of shallow hidden cave, and the results showed that the seismic numerical simulation can effectively help us design and optimize the geometry in actual field work. With the help of seismic numerical simulation, the efficiency and precision of shallow seismic prospecting will be improved significantly.
The Preliminary Analysis on Tower Crane by Earthquake Effect
Authors: Gu Yong Qiang , Mao Chun Feng
Published: August 2013

Earthquake damages to the tall and towering structures are usually very serious, but these dangers are often hidden. The paper uses the finite element software ANSYS to set up the overall modeling of the TC6010 tower crane which is produced by a company, and carry on the modal analysis based on it. The paper obtains the data of the displacement and the speed response of the complete machine after exerting the Ninghe Tianjin seismic wave, and has the preliminary analysis to the result. The results show that the tower crane is a low-frequency vibrating system and easy to cause the structure resonance, the crane tower may damage in the boom firstly under the action of seismic wave.
Analysis on Attenuation-Amplification Effect and Vibration Monitoring of Pier-Beam of Continuous Beam Bridge under Near Blasting
Authors: Huang Fu Wei , Liu Da Yang , Luo Hao , Liu Bo
Published: August 2013

Vibration of continuous beam bridge is caused by explosion seismic wave in influence area. In order to provide scientific basis for seismic design and security assessment for continuous beam bridge, three-direction attenuation-amplification effect of vibration of pier-beam was analyzed. Based on blast monitoring project of South Branch Approach Bridge of Xiazhang Sea-Crossing Bridge under construction, the attenuation-amplification effect of peak vibration velocity from the bottom of the pier to the top of the box girder in the different stages were analyzed. The average attenuation-amplification coefficients of peak vibration velocity in three-direction and the one synthesized by three vectors are concluded.
Ancient Commercial Buildings Seismic Performance Analysis and Study of Protection
Authors: Wang Yong , Yang Feng , Zhang Jing Lei , Zhang Yan Ni , Gao Yang
Published: August 2013

Ancient wood structure usually has good anti-seismic performance because of structural characteristics. Mortise joint and tenon joint of wood structure component parts of the node can be very good energy dissipation and mitigate the effects of earthquake damage at the time of seismic action. Column foot and foundation can effectively reduce the seismic response with friction-sliding. It can give clear status evaluation from the perspective of applicability to protecting the ancient timber structures which is of great importance to protection.
Study on Seismic Behavior of the L-Shape Steel Reinforced Concrete Short-Pier Shear Wall with Different Concrete Strength
Authors: Su Yi Sheng , Meng Er Cong , Xiao Zu Lin , Pi Yun Dong , Yang Yi Bin
Published: August 2013

In order to discuss the effect of different concrete strength on the seismic behavior of the L-shape steel reinforced concrete (SRC) short-pier shear wall , this article analyze three L-shape steel reinforced concrete short-pier shear walls of different concrete strength with the numerical simulation software ABAQUS, revealing the effects of concrete strength on the walls seismic behavior. The results of the study show that the concrete strength obviously influence the seismic performance. With the concrete strength grade rise, the bearing capacity of the shear wall becomes large, the ductility becomes low, the pinch shrinkage effect of the hysteresis loop becomes more obvious.
Experimental Study on Mechanical Properties of Jurassic Soft Rock in Shajihai Mining Area of Xinjiang
Authors: Wang Xiao Lei , Yan Shun Xi , Zhang Guang Can
Published: August 2013

According to the problemsof serious deformation of soft rock roadways and lack of system andcomprehensive study on surrounding rock characteristics and failure mechanismin Shajihai mining area, this paper carried out a series of mechanicalexperiments on the characteristics of surrounding rock in this area includinguniaxial compression test, triaxial compression test and water absorption propertiestest. Mechanical test results show that the compressive strength of surroundingrock of roadway is generally low, and mudstone compressive strength is thelargest which is 19.23 MPa, and compressive strength of the minimum is coalwhich is 11.32 MPa under natural condition. However sandstone and mudstone’sability of water absorbing is strong, and coal saturation strength issignificantly greater than that of mudstone and sandstone. Therefore, we shouldmake full use of the strength of coal in roadway layout and support design.
Seismic Risk Analysis of an Arch Dam
Authors: Zhong Hong , Li Hong Jun , Bao Yan Li
Published: August 2013

Seismic risk analysis is greatly helpful to seismic safety evaluation of dams. A preliminary study on seismic risk analysis of arch dam based on numerical simulation is presented. The numerical procedure approximately takes into account the influence of concrete heterogeneity, it can model the response of the dam from elastic vibration to ultimate failure. Five seismic damage levels including no damage, minor damage, medium damage, serious damage and collapse of dam are defined. Through Monte-Carlo analysis of nonlinear response of the dam, which considers uncertainty persistent in ground motion input as well as material properties of concrete, status of the dam after subjected to earthquakes is obtained. The final seismic risk of the dam, which conforms to the norm distribution, is reached based on data fitting. The results provide meaningful reference to seismic safety evaluation of the dam.
Instability and Failure Mechanism of Slope in the Condition of Extreme Snow Hazard
Authors: Jia Zhi Gang , Li Fu Rong , Li Ke
Published: August 2013

The function of three fields coupling of water-heat-mechanics is derived and established. The finite difference software FLAC3D is applied to simulate the affection of three fields coupling of water-heat-mechanics of the slope in the saturated state. The mechanism of instability and failure of the slope is revealed from two aspects like freezing depth and frost heaving deformation in the condition extreme snow hazard. The results show that freezing only occurs on the slope surface in the short time which makes no affection on the deep part; with the time lapsed the temperature in each depth decreases gradually and additionally with the increasing of the depth the effect of the surface temperature slows down. In the shallow part the temperature declines with the surface temperature declining and slows down with the increasing of depth. In the process of freezing the displacements occur on the surface to the direction of free boundary. In addition, the frost displacements increase with the time lapsing.
Seismic Analysis of an Intake Tunnel of Different Tunnellining Programs for a Nuclear Power Plant
Authors: Wang Gui Zhen , Li Ying Min , Lu Zhi Peng
Published: August 2013

Developing an analysis program and simulating the radiation damping effect in the infinite foundation and inputs ground motion rationally. The static and dynamic analysis of an intake tunnel for a nuclear power plant is performed with ANSYS based on some 2-D finite element models considering of structure-foundation interaction by Time-History Analysis. Aiming at different programs of two linings in tunnel, the stress and internal force distribution of the tunnel , the wall rocks and the lining is researched and analyzed, and the diagram of stress and internal force is drawn. The regularity obtained can provide the basis for the seismic response analysis and design of tunnels.
Seismic Performance Study on Buckling-Restrained Brace
Authors: Gao Er Xin , Wang Yong Gui
Published: August 2013

According to hot-rolled Q235 steel, four specimens of Buckling-restrained Brace of two sections and two composed methods were designed for Chinese steel market. The paper conducted the low-cyclical loading tests to detect the seismic performance of Buckling-restrained Brace. The force-deformation loops, the tangent stiffness and the equivalent damping ratio were studied. It is proved that the force-deformation loops of BRB are stable, plump and symmetrical. The equivalent stiffness and damping ratio are unaffected by steel variety and section form. Double angle steel core segments welded or no does not affect the interoperability, stiffness, ductility, energy consumption of BRB, and the collaborative is only associated with the relative stiffness of steel core and pipe.
Analysis of Foundation Non-Uniform Settlement for Building on Collapsible Loess
Authors: Li Yuan Xun , Zhu Yan Peng , Ye Shuai Hua , He Zhong Mao
Published: August 2013

The primary causes of non-uniform settlement for buildings on collapsible loess are large settlement of subsoil, local subsidence foundation, frost heaving of ground, infusion foundation, underground water level decrease and the influence of adjacent buildings and so on. According to the characteristics of the project, analysis the reasons of building that non-uniform settlement and fissure on the wall. Combine the method of reinforce the rectification for original building, put forward the method of reinforce the rectification which is applicable to the project. And put forward some suggestions for collapsible loess area construction, for the colleague reference.
Influence of Different Earthquake Excitations on Dynamic Stability of Single-Story Steel Frame
Authors: Liu Ying Chun , Zhang Wen Fu , Ji Jing , Du Juan , Ren Ya Wen
Published: August 2013

Dynamic stability analysis of twelve single-story steel frame structures is analyzed based upon the finite element method. The influence of different earthquake excitations on dynamic stability of single-story frame is studied. Time history curves of displacement, hysteretic curves of restoring force, phase plane trajectory curves have been obtained. The results indicate that the ultimate displacements of frames when structures collapse are almost identical and ultimate displacements are independent of earthquake excitations.
Analysis of Viscous Dampers for Continuous Bridge in Meizoseismal Area
Authors: Zhang Hang , Zhang Xie Dong , Wang Jin Tian
Published: August 2013

Continuous bridges jolted the public attention into the awareness of the seismic vulnerability due to its wide application in bridge engineering. Viscous dampers can effectively improve the seismic performance of continuous bridge. In this paper, taking the Yellow River Bridge located in seismic region with intensity VIII as an example, the influence of the damping coefficient and velocity exponent of the damper on seismic responses of the bridge are carried out in detail. The applicable model parameters are also presented.
Analysis on Seismic Behavior of Gravity Dam Based on ANSYS
Authors: Zhang Yan Bin , Liu Fu Sheng , Lin Cong , Zhang Lin
Published: August 2013

Dynamic analysis can be carried out quickly and accurately for the seismic performance of dam by using the finite element software. Added massed method is used for the dynamic water. Horizontal earthquake acceleration is 0.2G; vertical earthquake acceleration is two-third of horizontal earthquake acceleration; sub space iteration method is used for the modal analysis of the dam; Finding the maximum response-order mode shape, and then useing a combination of square and square root method to come to the conclusion of overall seismic response. The stress and strain of the dam had been analyzed and the weak link of key parts of the dam had been summarized in this article.It is concluded that seismic design requirement are satified for the dam.
Definition of Strain Amplitude for Cyclic Model to Simulate Actual Damping of Soils under Irregular Loadings
Authors: Liu Fang Cheng , Yang Jun , Zhang Wei
Published: August 2013

The determination of damping constitutes an essential part of the cyclic characterization of soils. While because of the damping of soils is nonlinear, ie., strain-dependent, the definition of shear strain amplitude under irregular loading process construct the key point of the damping based cyclic models. This paper introduces a new damping-based model (DBM) for nonlinear soil behavior simulation and discusses on the effect of shear strain amplitude definition on model behavior. Both qualitative and quantitative analysis re-sults show that the reversed hysteresis loading curve is significantly influenced by the pre-supposed loading amplitude and generally large pre-proposed shear strain amplitude will lead to low reversed loading trajectory. Analytical comparison among several definitions indicates that defining the maximum reversal point of history as the loading amplitude performs the best.
Recognition Method of Mesoscopic Medium Based on Cellular Automata Correction Method
Authors: Shi Zhong Wen , Chen Hao , Qin Zi Yi
Published: August 2013

Soil-rock mixture is a special kind of geological media,which is mixed of soil particles with weak intensity and rock blocks with strong stiffness and irregular shape. The rock blocks and soil particles cement with each other. The mechanical property of soil-rock mixture is different from rock and soil mass. This paper apply The digital image analysis technique is used to distinguish the features of rock and soil mass,and the model according to the corresponding relationship of cell and pixel is established ,then the numerical statistical laws of pixel can be obtained. As for the pixel between rock and soil mass that cant be distinguished distinctly, the cellular automata theory that with the mean function as the 2-dimensional transformation function is used to transform the image.Then the pixel of rock and soil mass can be distinguished.At the same time it can remove the effect of islanding pixels. Thus it can realize the more effective recognition for soil-rock mixture. It shows good effect through comparison.
Research of Earthquake Resistance Performance on the Mega-Sub Controlled Structure
Authors: Wei Zheng , Ye Jian Jun
Published: August 2013

This paper built the two-dimension equivalent model of mega-sub controlled structure system (MSCSS) and mega frame structure, make an analysis of elastic-plastic time history with the different seismic records of observed data. The research of displacement, acceleration and distribution of plastic hinges obtained by the test can illustrate the controlling characteristics of these two structures. The results show that within the elastic-plastic state, mega-sub controlled structural system still have good response control effect; the control effectiveness of the mega frame and sub-structures of the MSCSS is better than that of the mega frame structures.
Seven Mega Floor MSCSS Modal Analysis
Authors: Wang Jun Jun , Yi Lu Lu
Published: August 2013

Modal analysis is also known as dynamic analysis for mode-superposition method. In the seismic response analysis of linear structural systems, it is one of the most commonly used and the most effective ways. Through the modal analysis of building structure, we can get some basic performance parameters of the structure. These parameters can help us make qualitative judgments for the respond of a structure first, and can help us judge whether they meet demands for conceptual design. Modal analysis is also the basis of other dynamic response analysis, including dynamic time history analysis and response spectrum analysis.
Research on Seismic Resistance Performance of Continuous Prestressed Concrete Girder Bridge at Strong Earthquake Zone
Authors: Zhao Zhi Meng , Fan Cai Xia , Wang Zhen Ji , Li Zhi , Wang Ji Xiang , Yang Ya Juan
Published: August 2013

This study examines the dynamic performance of Yellow River Extra-large Bridge within Baotou to Shulin Ju Expressway, with measured seismic response spectrum and designed earthquake response spectra as well as dynamic time history analysis, to provide a basis for seismic design. This bridge is located at the strong earthquake zone with basic earthquake intensity of VIII degree, which has characteristics such as low pier, long span. Taking the approach spans of this bridge over the South Levee for example, research on dynamic performance of joint three-span (40m +70 m +40 m) girders for continuous prestressed concrete bridge with non-prismatic cross-section was made by using the Midas/Civil2012 finite element program to create a three-dimensional space simulation model, according to the Guidelines for Seismic Design of Highway Bridge (JTG/TB02-01-2008).
Seismic Behaviors of Prestressed Concrete Continuous-Beam Bridge Affected by Pile-Soil Action
Authors: Li Feng Lan , Song Chen Xiao , Liu Shi Ming
Published: August 2013

Combined with the typical prestressed concrete continuous-beam bridge with 17m+28m+17m span over the main channel of the Central Line of South-to-north Water Transfer Project, two finite element models of this bridge, one considering and another without considering the pile-soil action, were built by the specialist bridge analysis software MIDAS/Civil 2011. The main vibration mode and its frequency were calculated by the self-vibration analysis, and the seismic response of the bridge was given out by the SRSS method of response spectrum method. Based on the calculations, the effect of pile-soil action on the dynamic characteristics and seismic behaviors of the bridge was studied. The results show that the pile-soil action brought the bridge structure into flexible, which led to the smaller vibration frequency but had no influence on the top two vibration modes. It also led to the larger displacement at top of piers and midspan of continuous-beam and the smaller internal forces of brake pear under the seismic action.
Safety Evaluation Technology for Waste Dump Landslide of Open-Pit Mine Based on Fuzzy Mathematics
Authors: Xie Zhen Hua , Luan Ting Ting , He Na
Published: August 2013

In recent years, frequent waste dump landslides brought the huge losses. Now, there is no mature theory system about the research on waste dump stability, this paper puts forward a disaster evaluation method for waste dump landslide which bases on fuzzy mathematics principle, the evaluation method is convenient and practical. Firstly, we established evaluation indicator system on the basis of analyzing landslide influence factors; first grade evaluation indicators included engineering geology, hydrogeology, dumping process and other factors; second grade evaluation indicators included geotechnical properties, foundation soft rock, foundation slope, atmospheric precipitation, underground drainage, drainage facilities, dumping way, dumping order, propulsion speed, mining disorderly, blasting vibration and force majeure. Secondly, we used analytic hierarchy process (AHP) to determine the indicator weight. At last, combining with the actual situation of some waste dump and using fuzzy mathematical theory, we had the safety evaluation to waste dump landslides, the result is in good agreement with the actual situation and shows that the method is a scientific guidance to the safety management of the waste dump.
Analysis of Differential Settlement Influence on Internal Force of Box Culvert Structure
Authors: He Fang Ding , Cui Jin Ping , Sui Jun , Yu Yi Fan
Published: August 2013

The foundation settlement of soft soil highway engineering is too large, resulting in pavement wave-like because of differential settlement between the structure and adjacent soft soil foundation, which seriously impacts on traffic safety. Considering the soft soil foundation in the foundation treatment methods of CFG pile, sand bag well, powder spraying pile, we analyze differential settlement on the degree of influence structure internal force distribution, then provide the reference for the design and calculation.
Study on Methods of Urgent Refuge Planning Based on GIS
Authors: Wang Zheng , Wang Xiao Hong , Liu Ya Jing , Chu Jian Yu
Published: August 2013

Damage of disaster to residents can be mitigated by urgent refuge. But the old way to plan urgent refuge is not reasonable. So techniques and methods are needed. Geographic Information System (short for GIS) as a new technique and method is of some import to planning urgent refuge. Calculating the impact of factors in each raster, distribution maps of Euclidean distance is got. Then, the maps of factor which get different weight index are calculated by overlay way. The last map is as planning urgent refuge. After that, the way is used in a country as a test application. The result shows that the way based on GIS makes planning urgent refuge more scientific and more reasonable. Planning the country urgent refuge proposed is worthy to use for reference.
Research on the Disaster-Prevention Transformation Strategies for Existing Urban High-Rise Housing
Authors: Kong Wei Dong , Zeng Jian , Zhong Jing
Published: August 2013

From the perspective of architecture, this paper discusses the disaster-prevention strategies for existing urban high-rise housing. Through an analysis of architectural space, architectural structure, and building materials of existing high-rise housing, the paper puts forward disaster-prevention strategies with the purpose of reducing and alleviating casualty loss, and ensuring effective evacuation of residents.
Numerical Calculation Methods of Wind Load
Authors: Meng Xian Hong , Zhao Qiu Ying
Published: August 2013

Storm cause deformation and collapse of structure, endanger people's life and property security. In order to avoid or reduce the impact of wind load effectively, the paper mainly introduce wind tunnel test, numerical wind tunnel method, time domain analysis, frequency domain analysis and the research and application of domestic scholars.
Research on Key Technologies of Mining Accident Early Warning, Supervisory Control and Contingency Plan
Authors: Wang Qian , Li Ji Zu
Published: August 2013

Scientific accident emergency precaution can reduce the frequency and the level of mining accidents. In this paper, mine hazard sources reassessment, coal mine system reliability analysis, damage and lost estimate were proposed as basement of accident early warning, and the calculation methods were discussed furthermore. Then a three-tire architecture designed management system of accident was constructed ,which can provide reference information for supervisory control and contingency plan.
Assessment of Connection Ductility in Fire
Authors: Hu Ying , Chen Zi Xiong , Xiao Ming Kui , Li Ying Ming , Liu Yong Jun
Published: August 2013

Catenary action has been regarded as a viable load-carrying mechanism in fire for providing structural robustness to steel framed buildings, and this loading mechanism heavily relies on connection strength and ductility under exceptional loading conditions. However, the current code of practice has no detailed guidance on estimation of the connection ductility. This paper is dedicated to demonstration of how to quantify connection ductility in a fire or non-fire situation through the component-based approach. Connection ductility has been evaluated with emphasis on elongation and strength of connection components in each bolt row, and response of brittle components has been identified as an index for connection ductility and failure mechanism in a fire situation.
Structural Isolation and Mitigation Technology under Multi-Dimensional Earthquake Excitations
Authors: Lu Li Heng , Xu Zhao Dong , Zhao Shi Chun , Pan Yi
Published: August 2013

Researches on structural isolation and mitigation under multi-dimensional earthquake excitations are overviewed in terms of the analysis methods, devices and developing trend. The analysis methods for dynamic responses of building structures, long-span reticulated structures and bridges under multi-dimensional earthquake excitations, are systemically introduced. Several types of multi-dimensional earthquake isolation and mitigation devices are presented, and experimental results of a new type of device are discussed, it shows that the new device has good ability of multi-dimensional earthquake isolation and mitigation. Finally, suggestions for further study in this area are presented.
The Research of Pavement Preventive Maintenance
Authors: Song Yang , Wei Lian Yu , Liu Ping
Published: August 2013

This passage introduced techniques of preventive maintenance that using broad at present, explained the affect factors and principles, and analysis several measures of preventive maintenance and the best time of different conduct of road.
Emergency Management and Planning Framework of Transportation Evacuation for Urban Flood Calamity
Authors: Yu Hang , An Shi
Published: August 2013

Flood is a common natural disaster and has happened frequently in decade years with a huge number of fatalities and property damages. These hazards typically necessitate the evacuation of local or regional populations to safe destinations or shelters and require a cooperation and interdependent relationship of several departments and organizations. This paper proposes that an urban evacuation management system framework for a deluge catastrophe can be modeled through the relationships between five components of interest: 1) evacuation road-network service capability; 2) human risk-attitude; 3) public or private decision; 4) weather and flood disaster monitoring; 5) inter-transit between city systems. We extract data from the strategies and propose a framework for residential evacuation management. This framework model is set up to help the local government quickly model the situation of the whole evacuation procedures and progresses to choose an optimum alternative from all the solutions and by identifying potential bottlenecks on traffic evacuation network and allocating resources reasonably to evacuate residents more safely and economically.
The Method to Remove Water Vapor in InSAR - GPS Detect Method
Authors: Tu Peng Fei , Xia Lang , Li Hong Tao
Published: August 2013

With the development of InSAR technology ,many researchers begin to try to apply InSAR technology on trace deformation monitoring,In some areas of landslides, mining subsidence, city over collecting water surface subsidence, reservoir area surface subsidence and dam deformation monitoring have achieved good results. Now available satellite-borne SAR system can achieve theory monitoring accuracy in surface deformation monitoring , but because of a variety of error factors in reality , it often cant achieve the theory monitoring accuracy.This part is to introduce a way to remove the error factors-water vapor GPS detect method.
A Review of Rockfall Control Measures along Highway
Authors: Chen Yuan Chuan , Li Jia Kun , Ran Ling Gang
Published: August 2013

Rockfalls are a constant danger to motorists and to highway facilities in mountainous terrain. Rockfall disaster displays some features such as wide distribution, much quantity, sudden occurrence, randomicity and strong fatalness. Against rockfall hazard along highway, there are two types of protection: passive ones and active ones. In present paper, the authors conduct a systematically summary of rockfall control measures along highway. Seven kinds of key active methods and six kinds of vital passive technologies to prevent and cure rockfall are presented. This review is of certain reference value for road maintenance in rocky mountains.
Wind-Induced Progressive Collapsed Performance of Cup-Type Transmission Tower-Line System
Authors: Zhang Zhuo Qun , Lin You Xin , Li Hong Nan
Published: August 2013

The Cup-type transmission tower-line system was a classic representative of high voltage electric power carrier, which was an important lifeline project. However, it frequently collapsed under different environmental loadings, especially strong wind. In this work, four tower five line finite element models simulated wind-induced progressive collapse process by birth-to-death element technique in ABAQUS/Explicit. The numerical simulation results demonstrated that this application could describe the structural collapse performance clearly and effectively and transmission tower-line system collapse path depended on the number, position and last deformation of damage elements.
Study on the Seismic Performance of Rural Buildings in Beijing Area
Authors: Liu Cheng Bin , Ou Ya Ling , Dong Xing Chen , Zhang Yi Kui , Zhang Xiang Xiang , Deng Kai , Deng Li Yuan , Chen Lin , Huang Shan , Ren Mei Yan
Published: August 2013

Wenchuan earthquake caused huge losses in rural areas. The subject briefly introduced the earthquake damage characteristics of masonry structures, analyzed the earthquake damage reasons. The main purpose is to propose some measures to improve the seismic capacity of rural buildings in Beijing area. Through two seismic fortification measures, can effectively enhance the integrity of the masonry structure, reduce the seismic response, effectively improve the seismic capacity of the structure.
Kinematic Soil-Structure Interaction Effect in Layered Liquefiable Soils on Foundation Input Motion
Authors: Tian Li Hui , Sun Guang Yi , Ling Xian Zhang , Wang Zi Yu , Wan Juan
Published: August 2013

The principal objective of this study is to make use of medium and strong motion data from instrumented shaking table tests to evaluate the effects of kinematic soil-structure interaction on foundation input motion (FIM). The shaking table tests consisted of a 2×2 pile group in two-and three-layered liquefiable soils (models 1 and 2). Each test model was subjected to three realistic earthquake motions with peak accelerations ranging from 0.13g to 0.50g, and time step ranging from 0.006 to 0.02 sec. The three input earthquake motion represented the realistic earthquake motion with high frequency, low frequency and high amplitude. The foundation/free-field ground motion variations were quantified in terms of acceleration time histories and Fourier amplitude spectrum. Preliminary analysis of the data suggests that (1) regarding the input motion with high frequency, the higher peak acceleration of the foundation indicates the structure feedback and kinematic interaction between the soil and foundation during shaking; soil layering has little effect on foundation input motion, (2) regarding the input motion with low frequency, the kinematic soil-structure interaction increases the foundation response for model 2 while reduces it for model 1. The soil profile has significant effect on the predominant frequency, (3) regarding the input motion with high amplitude, the higher response of foundation in model 1 indicates the stronger kinematic SSI effect. The small deviation between the free field and foundation in model 2 indicates the coherent motion of the foundation with soil and no obvious kinematic SSI effect, (4) soil liquefaction has significant effect on the values of peak acceleration and peak Fourier amplitude.
The Designing of City Earthquake Refuge for Coastal City
Authors: Tan Wen Di , Zhu Li , Yan Te Liang
Published: August 2013

Planning of city earthquake refuge is one of the important measures for earthquake resistance and disaster mitigation. The coastal area is due to the seaside, compared to inland, will be affected by the earthquake and tsunami threats, in place of refuge in the design, not only from the earthquake perspective, but also from the design point of view the tsunami. This article through to the world many tsunami caused by the results were compared with the study, summed up the coastal refuge several design features, this article from the refuge to refuge, the elevation design, places of refuge facilities, places of refuge site safety aspects are discussed. This study is based on the coastal city, is on coastal refuge design perfect, to reduce the tsunami disaster influence is of great social significance.
Analysis and Application of the Dynamic Stability of Overlying Multilayer Spatial Structures in Deep Coal Mine
Authors: Shi Hong , Ge Yan Hui , Li Jun
Published: August 2013

With the deepening of mining, dynamic disasters appear in a large number in the coal mine, and the stress distribution and stress concentration caused by mining act as the important factors that induce the dynamic disasters. The range of overlying strata movement related to the appearing of mine press go beyond the range of traditional plane model, and influence the mining stress field as overlying strata spatial structures. The movement and distribution of overlying strata spatial structures are the theory bases of studying stress condition and dynamic condition of dynamic disaster. According to the characteristics of sediment rock and the movement of strata of overlying multilayer spatial structures in deep coal mine. By using the dynamic stability judgment rules controlled by the top coals recovery ratio, the author worked out the judgment curves of dynamic stability of overlying multilayer spatial structures and explained their application. This paper also analyzes the factors influencing the dynamic stability of overlying multilayer spatial structures. The suggested judgment rule and curve of dynamic stability have been tested by field experiments which achieved safe caving in isolated caving face by adjusting the top coals recovery ratio. The theoretical basis of designing the safe top coals recovery ratio can be provided according to different overlying strata, and the safe overlying strata controlling can be achieved in deep coal mining.
Effects of Abundant-and-Low-Flow Property of Annual Rainfall on Multi-Source Water Intake System Allocation
Authors: Lu Hang Xian , Ma Guang Wen , Wang Xiu Duo , Ping Feng , Li Fa Wen
Published: August 2013

Through analysis of the annual rainfall data from 1918 to 2005 in Tianjin, wet-dry year was determined; the abundant and low state of annual rainfall series and its durative in Meijiang lake region was studied. The results show that the occurrence of the dry year is most probable; the durative probabilities in descending order are: low, abundant and normal state; there is the highest probability of transition from low to low state, which indicates a more probable occurrence of large amount of water diversion.
Study on Model Tests of Desilting Tunnel of Longkou Power Station
Authors: Wang Min , Wu Yong Xin
Published: August 2013

The paper made a comprehensive introduction in model tests of the desilting tunnel of Longkou hydropower station, including prototype information, experimental purposes and content, then doing the comparative analysis of the theoretical calculations and data that observing by instruments. The tests results show that it is reasonable that desilting tunnel overall layout and the design type of the desilting tunnel, the various hydraulic elements that under various hydraulic conditions and the flow pattern of upstream and downstream have no serious adverse effects on desilting tunnel itself and other buildings, it play a role of support and verification to the design program.
Numerical Limit Equilibrium Analysis Method of Slope Stability Based on Particle Swarm Optimization
Authors: Wang Sheng Nian , Shi Chong , Zhang Yu Llong , Chen Kai Hua
Published: August 2013

The limit equilibrium method based on the results of numerical calculation is an important method for slope stability analysis. In this paper, PSO is used to control the locations of trailing edge and shear outlet, while the progressive approach method is used to control the radius of slope sliding surface. It achieves the location search of the potential sliding surface as well as the calculation of the corresponding safety factor. So the minimum safety factor and the location of the most dangerous potential sliding surface are determined. Taking a slope section plane of Xiluodu Hydropower Station as an example, the most dangerous sliding surface having been searched out is compared with the results of field surveys. It shows that the results of the proposed method are in good agreement with the actual engineering, and the validity and the correctness of the approach are also verified.
Comparing Simulation for Turbulent Dispersion and Coalescence of Droplets within a Spray with Two Models
Authors: Deng Shao Yun
Published: August 2013

Lagrangian and Eulerian modelling approaches are compared for simulating turbulent dispersion and coalescence of droplets within a spray. Both models predict similar droplet dispersion rates and shifts in droplet size distribution due to coalescence within the spray, over a wide range of droplet and gas flows, and for sprays with different droplet size distributions at the nozzle exit. The computer time required for simulating coalescence within a steady axisymmetric spray is of a similar order of magnitude regardless of which formulation, Eulerian or Lagrangian, is adopted. However, the Lagrangian formulation is more practical in terms of the range of applicability and ease of implementation.
Study on Warning Methods of Irrigation Reservoirs
Authors: Guo Xiao Na , Cao Sheng Le , Yu Cui Song , Zheng Cong Qi , Wang Jun , Song Shao Wen , Zhuang Hui Bo , Zha Zhi Rong
Published: August 2013

Reservoir warning is an important part of the red line of water resources development control. Based on the red line of total water in three red lines, this paper put forward firstly the quantitative method for determining water supply line and warning area of irrigation reservoirs, and presented the definition and method of irrigation reservoir warning. Taking the Douyazi reservoir in Jiaonan for example, early warning results based on warning period, which was divided into three months and non-flood season, were given. It provided technical support for implementation of the most strict resources management and sustainable development of the economic society.
The Design and Application of Permeable Groynes
Authors: Cao Yong Tao , Liu Pei Qing , Jiang En Hui
Published: August 2013

Permeable groyne is an innovative type of traditional groynes, Netherlands have accumulated some experiences on this field during the practice on the Rhine and Jamuna river (Bangladesh). This paper summarized the present study results of permeable groynes and inspired by it, proposed an supplementary alternative for the river training work in the Lower Yellow River.