Applied Mechanics and Materials Vols. 488-489

Abstract: Based on the oversize deep excavation project of Wangjing Soho in Beijing, the stress monitoring of top beam, soldier piles and anchor strand were carried out, which shows the development process of the internal force caused by spatial member interaction, reflect the differences from the mechanics principal of the traditional design method such as elastic foundation beam or equivalence beam of limit equilibrium state. Monitoring practice reveals that soldier pile were under the combination state of compression and bending, and are proved safe because of low stress; while the top coupled beam is under the combination state of tension and bending, and the tensile stress might goes to the stress limit, which has much relationship to the anchor arrangement, so the design of top beam should be regarded as one of the key control of construction safety. The tensile force of anchor strand are not easy to be hold with the tapered-type anchorage in site, the actual tested tensile force reaches 150~220KN , only the half of the design value.

Abstract: This paper studies the properties of the blends composed of DCLR (direct coal liquefaction residue) and asphalt using two different processing methods, compares the regulation that the DCLR additive content and processing method take influence on the high-temperature properties, low-temperature properties and durability of the blends. It is found that the DCLR can improve the high-temperature properties of asphalt but degrade its low-temperature properties. The properties of blends composed of DCLR, asphalt and furfural extract oil are tested and analyzed by adding a certain amount of furfural extract oil into it, which shows that adding DCLR can improve the high-temperature properties of asphalt and reduce its low-temperature properties but can hardly cause any impact on the properties of the blends. In addition, the processing method has a direct influence on the properties of blends.

Abstract: Hydrodynamic characteristic is an important reference to select vegetation material of ecological revetment engineering. In this paper, embankment will be divided into bottom-protection zone, key-protection zone, hydrophilic zone, landscape zone according to hydrodynamic characteristics of different water levels. Vegetations adapting to different protection area analyzed and discussed. With the example of ecological revetment in Naji reservoir in Guangxi, China, vegetation selection on different protection zone is demonstrated.

Abstract: The Strength characteristic of rock are different from them under unloading condition. The Strength characteristic of Ordovician limestone under loading and unloading condition of high compress which were taken from North Tian Mountain. It indicated that : Under unloading condition cohesion c and inner friction angle decrease according to loading condition, and the residual strength has more decrease than peak strength. Under unloading, peak compress strength and residual compress strength decrease distinctly, and the decrease reduces along with confining compress increasing.

Abstract: Under unloading condition, the characteristics of rock are different from them under loading condition. This paper talks about the characteristics of Ordovician limestone under loading and unloading condition of high compress which were taken from North Tian Mountain. The testing results indicated that: The lateral deformation and bulk deformation of rock sample are clearly in the process of unloading. Plastic deformation is not notability in the unloading condition. After the peak value in the stress-strain curve, the stress decrease quickly, it is showed that the brittleness characteristic is the better remarkable under unloading condition than loading condition. Under unloading condition, deformation modulus E₅₀ and Possion ratio μ is quadric with the confining compress.

Abstract: The skyline is the symbol of the cultural taste of a city and material reflection of facts of the urban life; the human emotion it contains is worth being taken seriously. A city is built for the purpose to create a harmonious space for production, living and recreation. By means of urban planning, we control the city to make it undergo healthy development. The urban skyline is the most intuitionistic representation of the humans urban construction achievements. we should pay attention to the urban skyline, make it specific by undertaking in-depth planning, architecture and landscape design, combine with the geographical features and cultural advantages and finally form the ideal urban space with different characteristics.

Abstract: Based on the freeze-thawing cycle characteristic of road concrete in cold climatic condition. The objective of this paper was to estimate the practicality of using fly ash discharged from a coal fuel electric plant in Inner Mongolia in concrete pavements. The abrasion resistance of road concrete containing fly ash was studied after suffering freeze-thawing cycles. The results indicate that the coarse aggregates were exposed after freeze-thawing cycle test and the replacement ratio of fly ash has little influence on the abrasion resistance.

Abstract: 3D Soil arching has an important influence on the bearing and deformation characteristics of piled reinforced embankments. The effect of the embankment height, pile-cap clear spacing, cohesion and internal friction angle of the embankment fill on pile efficacy was analyzed by numerical method in this paper. The results indicate that the pile efficacy increases gradually during embankment filling and remains nearly unchanged at the end of embankment filling. The ratio of the embankment height to pile-cap clear spacing greatly influence the pile efficacy. The bigger the ratio, the bigger the pile efficacy. The internal friction angle of the fill material also has somewhat influence while the tensile strength of horizontal reinforcement and cohesion of the embankment fill have little effect on the pile efficacy.

Abstract: Optimizing control of concrete dam in middle-later cooling age is discussed in allusion to the complex multi-factor problems which includes pipe cooling temperature, pipe cooling flow and pipe cooling time. This paper suggested an optimizing control method of concrete dam in middle-later cooling age based on the temperature dynamic prediction model of pouring storehouse. Combining the current measured temperature, it calculated the temperature cooling curve based on the pipe cooling calculation formula without heat resource. Then optimal pipe cooling measures of concrete pouring storehouse is obtained by optimization algorithm with middle-later coolings target temperature. Because of the small amount of calculation of the temperature dynamic prediction model that based on the pipe cooling calculation formula without heat resource, so optimizing control model of concrete dam in middle-later cooling age is feasible.

Abstract: For the geo-grid reinforced retaining wall, the reinforcement mechanism of seismic behavior is unclear, and there is no reasonable standard for seismic design. A non-linear finite difference method which is based on Lagrange method was applied to analyze internal reinforcement force of geo-grid under different design parameters. The elastic-plastic model is simulated to backfill soil and foundation, and the coupled elastic parameters are used to describe the interaction of soil and geo-grid. The design parameters include geo-grid reinforcement spacing, reinforcement length, backfill soil stiffness, and thickness of panel. Some distribution characters and sensitive parameters to the internal reinforcement force of geo-grid were achieved, which will be helpful to the seismic design of geo-grid reinforced soil retaining wall with integral panel.