Applied Mechanics and Materials Vols. 548-549

Abstract: The mining induced cracks in aquiclude are major factor of water resisting property and mining safety under water. The aquiclude is composed by loess layer and red clay layer in Yushuwan coal mine. The water reaction property of clay and loess of aquiclude is tested by soil mechanics method. The permeability coefficient of loess will be 0.856 m/d and clay will be 0.434 m/d in Yushuwan mining condition. The dilatability coefficient of loess is 16.1% and the clay is 14.6%. Through physical solid-liquid simulation with whole stress-stain similarity for Yushuwan shallow coal seam mining, the distribution of “downward crack zone” and “upward crack zone” is found to be the major factors of aquiclude stability and the “downward crack” is the main channel of the subsurface ground water flowing down. Furthermore, the downward crack closing in wet clay is revealed and the closing length is about 30% of the downward crack length. The expanding of clay and loess with water are principal factors of downward crack closing. This work will provide the theoretical base for aquiclude stability research.

Abstract: Based on an actual construction process, this paper put forward a nonlinear simulation analysis method, which can take the mutual influence between structural forming and the tensioning of the active-cables into account. The proposed method shows good performance in solving the problem of structure layout finding and the pre-stress calculation of pre-tensioning tendons by stages and in group. The method has clear mechanical conception and is of reference value for similar construction analysis.

Abstract: The presence of traffic on a slender long-span bridge (SLB) deck has two types of primary impacts: (1) modification of the bridge cross-section profiles, which may influence the flutter derivatives and in turn, wind-induced aeroelastic loads acting on the bridge; and (2) additional dynamic loads acting on the bridge including dynamic interactions from the vehicles. As compared to the investigations on the impact of traffic as external dynamic loads, those on the impact from the modification of bridge cross-section profiles are rather rare. A scaled bridge section model with vehicle models distributed on the bridge section has been tested in the wind tunnel laboratory. With the FDs obtained from the wind tunnel experiments of various modified bridge cross-section profiles by stochastic traffic, the present study is to numerically evaluate the impact on the wind-induced performance of the long-span bridge, such as the buffeting response and fatigue damage accumulation.

Abstract: Based on current status of village buildings as a starting point, combination of BIM technology with the design the green village buildings is discussed. By using software to simulate the concrete village building energy consumption, application effect of BIM technology is verified. Result shows that BIM (Building Information Modeling) technology not only help to make the building satisfying the green standards, saving energy by 32% than the other village buildings in the region , but also makes the time period percentage of building satisfying the requirement of minimum illumination that relying on natural lighting alone as much as 92.6%. It is helpful to energy saving, environmental protection, reduction of construction cost, and would become an important platform for planning and construction of green village buildings.

Abstract: Embedded steel frame concrete blast walls can effectively counteract and dissipation the air-blast wave of the explosion. By contrast widely recognized air-blast wave empirical formula to verify the feasibility of the method of explosion load simplify model numerical simulation calculate the shock wave problems by using the explicit finite element software ANSYS/LS-DYNA and keywords *LOAD_BLAST. Obtained, The results of simplified explosion shock wave load by *load_blast have small difference with the actual explosion model; The destruction of the wall are mainly shear and brittle failure; The ability of Embedded steel frame blast wall resist air-blast wave significantly greater than other wall.

Abstract: Landscape planning and design of Chinese residential area is in a continuous development and in-depth exploration stage. The small green landscape design able to both improve the quality of living environment for residents, and also aid in display the unique cultural characteristics of the residence. Greenbelt landscape design problems and issues in modern Chinese residences development were investigated in this paper; principles and methods of ecological planning and design also were proposed.

Abstract: The trend of low-carbon in world and resource shortages, environmental carrying capacity of weak basic conditions, decided to go low-carbon path is an inevitable choice in China. The city’s ecological environment, cultural tastes, economic vitality, management systems, technological progress has become the focus of urban studies nowadays. Study on how to improve the energy-saving technology to create a low-carbon life is the fundamental way to achieve sustainable urban development. Therefore, the study of low-carbon urban development, is not only has theoretical values, but also owns practical significance. In this paper the reason for low-carbon city, the basic concept of sustainable development was discussed. The significance of the construction of green ecological city and the future direction of the green eco-city construction was presented.

Abstract: This paper will conduct a case study of slow lane system of Guangzhou International Biological Island (GIBI) greenway network in three main phases: (1) describe building standard of slow system in Construction Guidelines of Regional Greenways in Guangdong Province; (2) analyze GIBI Greenway comprehensive plan and investigate the site to illustrate slow lane design; and (3) provide concrete improvement measure and suggestion to slow lane system. We concluded by discussing solutions of these problems, and suggested some proposals in design to meet the visitors’ requirement for the future construction of greenway. The GIBI Greenway has served as a model for riparian greenways elsewhere in Guangzhou. This research hopes to guide slow lane system’s programs and development standards to make bicycling in Guangzhou more safe, comfortable, convenient and enjoyable for all bicyclists.

Abstract: The mathematical model based on graph theory and the refrigerant natural cycle system of gas-liquid two-phase flow network is established. Incidence matrix was used to describe the relationships between the various components. The node conservation equations, branch equations, momentum conservation equation in return circuit and mass conservation equations of system are established. The model was solved by using variable step gird iterative method. Then refrigerant state of each node and refrigerant flow of each branch in network model are obtained. Establishment and solution of the RNC network model provides an effective way for the further performance analysis of system.

Abstract: In order to analyze the effect of heat preservation, the heat preservation technology of detail structure, such as decorative lines of external walls, edge beam and edge column, windows, balcony and laying position of air conditioner, have been well treated under the system of thin plastered external wall based on EPS. Moreover, the technical-economy benefits of detail structure treatments have been analyzed by comparing with those without detail structure treatment. The results show that better heat preservation and economy benefits would be created by detail structure treatment, which could provide good reference for similar construction process.