Advanced Materials Research Vols. 243-249

Abstract: Soil slope is one of the main parts of the road engineering. The stability of the slope is an essential prerequisite to ensure the safe operation of road transport. In seasonal frozen regions, shallow landslide hazards in soil slopes usually happen, which pose a serious threat to road safety operations. During the melting process, there forms stagnant water lubrication between the melting soil and freezing soil interface, which constitutes the weak interface of landslide hazard. Special methods to form the freezing – thawing (F-T) surface is designed, and takes consider the interface strength as the foundation of experimental tests, then opening to research the soil slope stability. Safety factor modification of the soil slope is presented. The conclusions of this paper present well theoretical and applied value to the regional slope failure analysis.

Abstract: Currently, there are so many heavy vehicles being driven fast and overloading on highway. Carrying capacity of highway are not fit with this situation, They are often run in a serious state of overloading and fatigue. This directly influenced the life of highway. So, to improve the mechanical properties and carrying capacity of highway, and to construction high standard, high speed, large-tonnage, long-life modern highway are urgent and imperative. This article analyzes the current traffic load and design, materials select and construction status of highway, and proposed some measures to improve mechanical properties and construction standards of highway. Life of highway can be greatly improved by adopt these measures.

Abstract: The causes and status of saline soil in southern Xinjiang are stated simply, and the properties of it are presented based on experiment. Much emphasis is laid on the improvement mechanism design and the scheme comparison. On this foundation, a series of tests are conducted. The functions of different subgrade fillers and the reasonable proportion of them are studied. The result reveals that improvement scheme II-3 can effectively decrease anion content in saline soil, and mixed with cement and active material fly ash, can significantly increase the strength of the soil mass, and decrease water involved in expansion and frost heave. The research findings can provide an economical and applicable reference to the solving of problems such as frost heave, salt expansion and melt sinking of the saline soil subgrade.

Abstract: The more used forecasting method of post-construction settlement of subgrade is to analyze the measured data to determine the forecasting model parameters，and then use this model to forecast the post-construction settlement in actual projects. Currently used forecasting methods are Hoshino method, index curve method, hyperbolic method and so on, these methods have their advantages, disadvantages and applicability. To make the best use of the advantages and avoid the disadvantages, accordingly the combination forecasting method is proposed that can both comprehensive utilization the information provided in a variety of forecasting methods and also improvement of the forecasting accuracy. Then a superior combination forecasting model is established by the highest forecasting precision and the best forecasting stability. Taking the measured data of post-construction settlement of subgrade for example, comparison of fitting precision and forecasting precision of various forecasting methods , and show that the superior combination method has advantages of higher fitting precision, forecasting precision and their stability.

Abstract: In order to discover the water damage mechanism of CRCP, the simulation test was established to study the relationship between crack width and seepage rate. The results show that the seepage rate increases with the widening of crack. For reducing water damage and improving pavement performance, some essential waterproof measures, according to the amount of rainfall, should be taken in designing the CRCP.

Abstract: Through the foaming mechanism and foaming effect evaluation, this paper analyzes the production procedure, optimum content and strength of foamed asphalt mixture thoroughly. Combined with the construction process quality control and inspection and acceptance criteria, this paper provides data for reference and theoretical basis for application of cold recycled technology of foamed asphalt to pavement project. Its construction without disrupting traffic, thus shorten the construction period and improve efficiency, which also have advantages such as energy conservation, environment protection and economy. Above all, it is beneficial to foamed asphalt′s popularization and application.

Abstract: In accordance with the spalling of concrete pavement in cold area, this paper puts forward a concrete proportion after making plenty of experiments, which is carried out by adding flyash, silicon powder, air entraining and water reducing admixture with different contents and proportions to normal concrete, using flexure strength, compression strength, impermeability and frost resistance as evaluating indicators. The concrete proportion reaches high flexure strength and compression strength, good impermeability and frost resistance. According to the experimental results and economic analysis, it is shown that the concrete proportion can effectively reduce spalling of concrete pavement. Therefore, it has good use value and it is promising with a good prospect of application.

Abstract: Based on a comprehensive analysis of the influencing factors and special features of cement concrete pavement overlaying technology, a fuzzy analytic hierarchy process (AHP) model is constructed for the comparison and selection of overlaying schemes. At first, the numerical weight for each criterion of the hierarchy is derived and tested. Then the feature matrices of all the schemes are constructed based on experts’ evaluation. The optimal scheme is chosen according to the numerical priorities of each scheme yielded by fuzzy calculation.

Abstract: In this paper, models for vertical and spatial coupling vibration of vehicle-track-bridge system are established separately. The track vertical irregularity sample in time domain is established by power spectrum density and taken as the exciting source to analyze the coupling vibration of vehicle-track-bridge system of two models. The advantages and disadvantages and applicability of the vertical vibration model and the spatial vibration model are analyzed by comparing the vertical vibration responses of the two models under excitation with same level of track vertical irregularity.

Abstract: Strength and deflection finite element analysis was given to the 40ft Container which export to Saudi when at the lifting and static conditions in this text. The text applied three-dimensional modeling software Pro / E for solid modeling, HyperMesh finite element software for mesh, ANSYS finite element analysis software to calculate, show maximum deformation and maximum stress position to every conditions of the container .provide the reliability calculating for this type of container.