Applied Mechanics and Materials Vols. 71-78

Abstract: Cao river aqueduct was the largest aqueduct in Asia for its span,the actual stress state of aqueduct structures, and whether the effect of prestressed meet the design requirements all will directly influence the safety operation of aqueduct.Load test is an important means of testing structure design and construction quality of reinforced concrete, and stress test is one of the important methods of monitoring, which can more objectively reflect the real stress condition of structure. Therefore, impounding test of the aqueduct was carried out before formal operation, stress characteristics of the aqueduct under impounding conditions were analyzed in detail. The results analysis shows that the aqueduct were in well flexible working conditions under testing load.These show that the structure design is basically rational; design value of material strength and the actual stiffness of the aqueduct meet design requirements and have a certain degree security reserve. At same time, the test offered a foundation for its later period working.

Abstract: This paper has answered several questions on the multi-lateral horizontal well productivity formulas. Firstly, the fact that the potential at the crack equals zero, which is a key step in the process of structuring the multi-lateral horizontal well productivity formulas, has been rigorously proved through complex analysis. Secondly, the difference between the two “q” appearing in the process of structuring the multi-lateral horizontal well productivity formulas has been identified clearly. Thirdly, the transformation of the permeability from the isotropic to the anisotropic and the reason of using the equivalent well diameter have been demonstrated.

Abstract: The accurate prediction of gas well productivity is an important task in gas reservoir engineering research. According to the global optimization ability of the genetic algorithm (GA) and the superior regression performance of the support vector machine (SVM), this paper proposed a method based on GA and SVM to improve the prediction accuracy. As the proposed model can reduce the dimensionality of data space and preserve features of gas well productivity, compared with BP neural network model, the proposed GA-SVM model for gas well productivity in practical engineering has higher accuracy and speed, the maximum error is 1.5%. Thus, it provided a new method for the forecast of gas well productivity.

Abstract: In view of the wood of pine, analysis of the basic principles of pine furniture design as well as the connection patterns, furniture structural design of the basic method.

Abstract: Due to the industrial transfer in globalization and information, a new economic form—the headquarter economy gradually formed and became one of important development strategies for central city. In this paper, Jiahai enterprises headquarter park( JEHP) is as a study case, which located in development zone of Jinxia, Changsha. Based on the analysis of regional socio-economic, aiming at the sustainable development of society and create an ecological environment, the planning concept has been proposed, which is co-development of enterprises, park and social; sharing-plat of enterprises; co-create of natural environment and construction. A Paradigm has been provided in this paper, which is based on the concept of Ecology and sustainable development for the construction of headquarter economic park in new period.

Abstract: Based on Jiangxi University of Traditional Chinese Medicine survey and found that the current development of TCM University in Jiangxi stadiums management exist some basic questions, and puts forward some corresponding countermeasures to these problems, and provides referential theory basis for the development of our school stadiums.

Abstract: The project of the office building of the People’s Government of Chagan Hada was initiated by the Norwegian government for helping with energy saving reconstruction in undeveloped areas of developing countries. By reconstructing the office building’s external walls, doors, windows, roofs and heating system, the coal consumption of the office building has decreased from 50kg/m² to 23.8kg/m², saving raw coal by about 26t each year. After the reconstruction, the temperatures of various zones in the office building have risen by 13°C to 15°C respectively. The project fully adopts existing building energy saving technologies and locally produced building energy saving materials. What’s more, it introduces building energy saving ideas of Norway and has reached three achievements: First, both strict working attitude and skillful operations were ensured in construction; second, demonstration effect was emphasized; third, importance was attached to ability development.

Abstract: The carbonation resistance of ready-mixed concrete in Qinhuangdao was investigated and the predicted experimental data indicated that the carbonation resistance of concrete in Qinhuangdao was unsatisfactory. The longest predicted service period of concretes in this survey is merely 39.1 years when the carbonation depth reaches 25 mm; and the shortest is only 8.7 years. It’s awfully difficult to guarantee the durability of reinforced concrete structures for 50 years. The experiment results also shows that both the water to binder ratio and the mineral admixture mass fraction have great influence on the carbonation resistance of concrete. With the decrease of water to binder ratio and mineral admixture mass fraction, the predicted service years of ready-mixed concrete increase dramatically.

Abstract: The machnical response of the thin rock (and/or soil) pillar of a twin tunnel with super-large-span and small-spacing is described upon a model of finite characteristic ratio constitutive theory (FCRT). The analysis result is compared with the results from in situ monitoring and the D-P model of the classic plastic constitutive theory; it shows that the deformation characteristics of the middle pillar during tunnel excavation process can be reasonably described by the FCRT model, and the method of parameter determined of the FCRT model is relatively simple than the classic plastic model due to the model has a clear physical background and with little randomness.

Abstract: On the basis of old methods of how to resolve the diameter of air bubbles in stationary water, the author uses numerical value certificated that the relation between the diameter of air bubbles and the airflow velocity of aperture is hyperbola. Then the author proves the connection of the volume of air bubbles, gas flux and the diameter of aperture, which the air bubble is forming at the first stage. It is concluded that the volume of air bubbles will expand with the diameter of aperture enlarging when the gas flux is remain unchanged. Furthermore, the volume of air bubbles will expand with the gas flux enlarging when the diameter of aperture unchanged.