Stress Measurement and Deformation Control of Support System in Shallow Light Railway Tunnel

Combined with the real example of monitoring pressure on the supporting system in the long span underground space of DK7+692 section at Jiao-Xin line of Chongqing light railway,it is set forth the methods about choosing the support system and its parameter,digging methods of underground space,measuring and testing methods for the stress of the support system;the testing results and variation pattern were analyzed for the stress of the initial supporting I-steel,axial stress of bolt,stress of shot-concrete,supporting pressure of temporary I-steel and stress of steel of the second lining,then,the reason for deformation of the support system induced by sharp increase of I-steel was determined.Based on this,considering the real problem,the construction plan and the support system is changed,the deformation of support system was under control and the danger was avoided,the informative construction and construction safety were realized.     

Study on the Sand Duct Pressure and Energy Dissipation for Tongkou Hydro Power Station

Tongkou power station is an all-round hydro project,where the mixed exploitation mode is adopted with mainly for power generation.Integrated with the model test result,the duct discharge capacity and flow coefficient in various discharge hole are discussed,the influence of duct shape on inlet pressure,energy dissipation and tail water is analyzed,the improvement measures on conveyer way pressure and energy dissipation are put forward too.The achievements of this study have been adopted by the designers.     

Application of Revised BP -NN Method to Landslide Stability Analysis in the Three Gorges Area

Using the revised BP-NN,this paper presented the neural network method for landslide stability analysis in the Three Gorges area.By choosing 30 typical landslides in this area as examples,the stability state estimated by the revised BP-NN method is highly consistent to that by conventional transfer coefficient method.And the method presented in this paper has following advantages:the input parameters are easily obtained and this method does not deeply rely on investigation quality and shear strength parameters of slips and is a quite simple one.The BP-NN method is a new measure to stability analysis of landslides in the Three Gorges area,which is especially suitable to the stability prediction of landslides before investigation.     

Rapid Prototyping:A New Method of Digital-Architecture Design Study

This research explores the enlightenment on the design conceptualization and visualization in digital architecture.This study uses 3D models as the main source of data,taking the process of design development as its object.A rapid prototyping(RP) technology is used for 3D color output of design models.The substantiated digital models are used as an important media in design interaction.It is found from the study that RP models were an important media in connecting the virtual world and the real world.Designers could verify their intentions and thus increase efficiency by switching between both worlds.The surface attributes of components and the characteristics of architectural spaces could be merges with images,as a way to extend the freedom in the declaration of a surface's appearance.The large amount of design information can be simplified by explicit visualizing design data.     

Increase of Wave Velocity in Precast Pile along with Time and Its Analysis

Low strain dynamic testing on actual pile was conducted to investigate if the wave velocity is varied in the installed pre-cast pile.It was found that the wave velocity of the pile is raised along with time.The analysis has been carried out through with one dimension and three dimension stress wave propagation theories.Among various factors influencing the rise of wave velocity,the factor of the side soil contribution is the chief one.The soil around the pile works jointly with the pile,as if to enlarge the section size of the pile.Both the increase of wave velocity and the bearing capacity of pile are consistent.So the time effect of wave velocity can be used to study the time effect of bearing capacity of the pile and to determine the bearing capacity of piles.     

Competitive Performance of Construction Companies Based on Analytic Hierarch Process

Competition among construction companies becomes drastic while market economy is gradually established in China.It is a problem of concern that how to rationally evaluate the competitive ability of construction companies in order to plan the competitive strategy for companies.The multi index system and comprehensive index are proposed in this paper and Analytic Hierarch Process(AHP) is applied to calculate the weights of multi index.The evaluation model of competitive performance of construction companies is presented based on AHP.An example for the evaluation model is given.The results demonstrate that the model can be used to efficiently evaluate the competitive performance of construction companies.The competitive strategy can be suggested through analyzing some factors influencing the competitive performance of construction companies.     

Research on Behavior of Elasto - Plastic Stability of Schwedler Domes

More than 400 tests for the complete-process analysis considering geometry nonlinearity and material nonlinearity of Schwedler single-layer latticed domes with various geometries have been carried out and the critical load is obtained.The effect of initial imperfection,asymmetric load distribution,especially the effect of material nonlinearity on the stability behavior of this kind of domes is considered,and the rule about the elasto-plastic stability behavior is concluded.Based on the work introduced in present paper,people can get useful information for engineering design or theoretical study.And some conclusions could be drawn:(1)To ensure security of the dome,the critical load of the dome must be confirmed by the complete-process analysis considering geometry nonlinearity and material nonlinearity;(2) Schwedler single-layer latticed domes belongs to structure of imperfection sensitivity;(3) The critical load of the dome is affected a little by the asymmetric load distribution;(4)The effect of change of supporting condition on the critical load of the dome should be considered properly in engineering design.     

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连接的三相负载断中线后其电压分配规律李健,杨孝龙安康师专物理系!陕西安康725000,安康师专物理系!陕西安康725000三相负载;;中点位移;;相量图本文通过作相量图法，归纳出三相不对称负载星形接法助中线后各相负载的电压分配规律。0安康师专学报JOURNAL OF ANKANG TEACHERS COLLEGE41-43 40TM13C042;33;H;CC042_33;李健000600130004000441-43 408253     

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