Applied Mechanics and Materials Vols. 587-589

Abstract: The buried depth of gateroad in a mine mining, belongs to typical deep-seated roadway in soft strata. Due to the influence of mining, the deformation of roadway was serious. To ensure the stability of roadway surrounding rock during mining, roadway deformation damage law under the influence of mining was studied by FLAC3D numerical simulation. The results show that under the influenced of deep three “high” and one “disturbance”, the surface surrounding rock of roadway destroyed quickly, made a wide range of plastic failure zone. After the roadway excavation, the trend of deformation and deformation rate increased evidently under the influence of mining. And the closer distance of working face, the faster change trend. In 40m from working face, the deformation rate decreases relatively affected by periodic weighting. From working face 10m, the deformation rate is largest.

Abstract: In general, clayey soil was used as material embankment for increasing road way level before road structure being constructed. Some types of clay are expansive soil, its have been contributing to pavement failures and subsequently causing increased annual maintenance expenditure of the road. The pavements design/redesign methods are found to be the primary cause of these failures. Thus, it is quite important to propose the Kuantan clay engineering properties chart for design criteria that can improve the embankment performance. Thus, it is quite important to investigate the Kuantan clay properties so that can improve the embankment performance. This paper was evaluated and utilized of the engineering properties of Kuantan Clayey as material embankment for roadway. The research were conducted soil engineering properties, standard compaction, four days soaked California Bearing Ratio (CBR) test to ten clayey samples from various sites in Kuantan. The 4 days soaked CBR of clayey samples were prepared at optimum water content. The chemical element was investigated by Integrated Electron Microscope and Energy-Dispersive X-Ray Spectroscopy (SEM-EDS) and linear regression analysis were used to anlyzing relation among engineering properties variables.

Abstract: Prone to low temperature cracking of asphalt pavement problems in cold areas, testing BBR on 70# base asphalt and 4 kinds of different dosage of SBS modified asphalt, testing TSRST on their mixture to appraisal the low temperature performance of SBS modified asphalt mixture. Results show that compared with the temperature stress of internal cracks of base asphalt and SBS modified asphalt mixture not rise significantly. But the stress of SBS asphalt mixture growing slow and the temperature of cracking reduce obviously; it means the low temperature performance improved. This shows that SBS improves the toughness and reduced the modulus of asphalt mixture in low temperature, rather than increasing the tensile strength of mixture specimens.

Abstract: The bridge infrastructure is critical to both political and economic development and Building Information Modelling (BIM) is now an innovative technology for bridges’ planning, design, construction and operation. However, it is currently difficult to achieve BIM’s practical value in bridge industry due to existing barriers. The focus of this paper is on proposing a new implemented BIM framework for bridge engineering. Particularly, the research project discussed and summarized the barriers which affect effectiveness and collaboration existed in traditional bridge project delivery and proposed a detailed BIM framework based on the traditional workflow to embrace collaboration and interoperation in the whole lifecycle of a bridge. The framework can significantly facilitate integrating BIM tools and practices, and increase the collaboration and productivity throughout the whole process of a bridge.

Abstract: We designed the experimental model of main tower of Tianjin Haihe bridge according to photoelastic experiment theory and proceeded stress experiment at the positions where the stress calculation is precise. Then we compared the experimental results with the finite element calculation results to verify whether the photoelastic experiment fits the stress calculation of main tower of cable-stayed bridge. The experimental results show that the photoelastic experiment could supply gist for the stress calculation of main tower of cable-stayed bridge, which is significant far and wide.

Abstract: We discussed the impact of the natural void radio of cohesive soil on the calculation of the backwater height of the highway bridge. Firstly, we discussed the principle of the calculation of the backwater height and the method to calculate the backwater height of the highway bridge which was used by the design unit. Secondly, we analyzed the impact of natural void radio of cohesive soil by using a true project. We found that the method to calculate the backwater height which was used in the Hydrological Specifications for Survey and Design of Highway Engineering was not perfect. Finally, we should correct the parameter of the mean median grain which was decided by the natural void radio of cohesive soil.

Abstract: In order to study the mechanical characteristics of continuous rigid bridge with corrugated steel webs, a bridge of this type with a main span of 100 m is analyzed in this paper. Three models of the whole bridge are established by MIDAS/Civil software, the internal force and deformation of the bridge under the action of dead load, live load and prestressing force were analyzed; results of different modeling methods were compared and the structural checking computation was also finished. With the help of calculation results, the design rationality of the continuous rigid bridge with corrugated steel webs was analyzed finally.

Abstract: Concrete continuous box- girder bridges have a large proportion in small span and long span bridges, and it has very broad prospects for development. Along with the large-scale construction of this kind of bridge, various problems have also emerged, especially the damage of RC beam’s diagonal section in bridge girder deflection. It always appears the inclined cracks in webs which cause by principal tensile stress, so it will be the potential damage to the whole bridge. However, the existence of the vertical prestress, will make the principal tensile stress of box girder in greatly reduced. So as to make cracking resistance performance of diagonal section is better than the ordinary reinforced concrete bridge. For an engineering example, this paper puts forward several different vertical prestressed steel arrangements. Based on different decorate a form of vertical pretressd bridge girder under stress numerical simulation, it is concluded that bridge’s web principal tensile stress distribution and its variation law, and then optimize the vertical reinforcing steel arrangement, improve the overall safety of bridge structure. It can provide the reference in the process of construction when we face the similar problems in the future.

Abstract: Taking the bare arch deformation under gravity as target alignment, the influence matrix that associates the cable forces with segment deformation is obtained via ANSYS program, and the cable force is quickly calculated by MATLAB quadratic programming toolbox. It is illustrated with an example of Guizhou Zong-xi River Bridge, which is a 360-meter concrete filled steel tube bridge in construction, and the calculation process is given. The results show that, this new method has the advantages of high precision and less number of iterations.

Abstract: Three kinds of structural pier forms – double thin wall pier, combined pier and single pier – were designed for prestressed concrete continuous rigid frame bridge with pier height that overs 100m. Taking an example of Hezhang bridge which is located in Guizhou province, the elastic stability at the largest cantilever stage under action of wind loads were analyzed and concrete volume of pier and cushion cap were calculated. The results indicate that the variable cross-section pier has a better performance of elastic stability than that of uniform pier. Considering the construction difficulty, stability performance and material consumption, recommendations for selecting the structural type of pier with height between 100 m~200 m were given.