Applied Mechanics and Materials Vols. 368-370

Abstract: It is easy to cause Yangtze River embankment soil slip or even collapse to have a deep foundation pit construction adjacent to Yangtze River outside embankment，with lots of risk . A new combined construction technique for large caisson is presented. The construction technology, the earthwork excavation of deep high pressure jet grouting pile combined with undrained open caisson construction technology, with data monitoring for the open caisson excavation control is adopted. This study mainly summarizes the advantages of deep high pressure jet grouting pile combined with undrained caisson combined construction technology engineering application, and describes the process of the combined construction and measures of deviation correction.The new combining construction technique has made a relatively effective protection for the Yangtze River levee and its ecological environment,having great engineering application value to some similar engineering.

Abstract: The famous Wind-Rain Bridge of Enshi Tujia and Miao Autonomous Prefecture is one of the most peculiar civil buildings in national architectures of Enshi equally famous as the tilted house, the Wind-Rain Bridge is of extremely long history made of wood in peculiar mold with vivid minority nationality characteristics. The Wind-Rain Bridge of Enshi is analyzed and explored in the paper in several aspects including architectural environment, construction materials, construction technology, structure and decoration.

Abstract: During the construction period of roller compacted concrete (RCC) dam, the scientific control of safety and progress is very important. It can provide guarantee for realizing the high-standard, high-intensity, continuous and rapid construction. First, through analyzing the coupling relationship between construction safety and progress, the procedure of progress control coupling safety analysis was proposed. Second, a mathematical model for coupling control of construction safety and progress that considers complex constraints was developed. Third, a construction simulation system considering safety factors was developed. Finally, these methods were applied to a practical project, and can provide new theoretical principles and technical support for safety and progress control in the RCC dam construction process.

Abstract: In order to improve the quality of integrated pipe network design, reduced the illogical arrange and conflict in the blueprint of the integrated pipe network, and provided a zero conflict blueprint for pipe network construction. Based on the 3D information technologies, building aided design module of the metro station integrated pipe network aided construction and management system. Through the parameterized modeling technology, 2D information of the metro station transformed to 3D information model, realized the functions of property management, finding and modify conflict for 3D information modeling. Finally, the system was applied in Ningbo Metro Line 2, solved the problem of conflict in design, provided a collaborative design system for Design Institute.

Abstract: A deep-buried highway tunnel is constructed with complex geological condition which existing an alternation of soft and hard rock and having feature of high ground stress, and extrusion, fall-block and twisted phenomena of supporting structure appear in many places during construction which pose a serious threat to the safety of tunnel construction. In combination with the construction process of Shimenya tunnel, by using the finite difference software FLAC3D, the surrounding rock stability is simulated, and the numerical calculation results of advanced pilot excavation method with different structural inclinations. The conclusion can be used for reference for the design and research of similar tunnels.

Abstract: This paper summarizes the structure forms and characteristics of the aqueduct's supporting structure. The main method of plastic limit analysis and theory of the aqueduct's supporting structure were introduced, and the existing problems of the present research were analyzed in the paper, and thereby the research trends of the ultimate bearing capacity of the aqueduct's supporting structure in near future was proposed.

Abstract: According to the correlation characteristics of risk factors in highway tunnel engineering construction, based on the risk identification and analysis of accidents, the interactive correlations among these risk factors are analyzed by Delphi Method. This paper adopts the decision making trial and evaluation laboratory (DEMATEL) method to analyze the risk of tunnel engineering construction. Then, a comprehensive influencing coefficient of various risk factors is calculated by a comprehensive influencing matrix, the reason-result chart for these risk factors is made, and the key risk factor influencing the tunnel engineering construction is obtained. The result shows that DEMATEL method is effective for the risk analysis of tunnel engineering construction via the case study of Wulong Tunnel construction in China.

Abstract: Analysis the dynamic response of the stay cable subject to parametric excitation represents a complex task for cable design procedure and forms an important step in the cable mitigation design. This paper analyses the characteristics of cable resonance under indirect excitation. The problem of cable vibration under the motion of the supports is considered as parametric excitation. The formulae for the estimation of maximum amplitude of cable vibration are presented to determine the resonance characteristics of large amplitude vibration of the cable under indirect excitation.

Abstract: In this paper, combined with the approach bridge of cast-in-place continuous box girder project,discussion on the main bridge construction with support cast-in-place scheme design.The role of a great reference for large-scale projects,from the implementation of the index statistics, analysis shows that, to achieve even better than the specification requirements, and achieved the desired results.

Abstract: Combined with the construction of Jinghang Canal Bridge of Jiangliu highway, shrinkage and creep property of the cast-in-situ high performance concrete of bridge girder was researched. The results showed early shrinkage and creep development of the high performance concrete was relatively rapid, and creep tended to be stable 120 days later. With the admixture increasing, shrinkage and creep of the concrete were reduced. Meanwhile, early creep rate deceased. Similar results applied to the reduction of sand rate and water-cement ratio. Based on creep prediction models both at home and abroad, hyperbolic power function and exponential function model were put forward, taking the influence of material parameter and environmental factors on shrinkage and creep into consideration. In accordance with the model, concrete creep formula was given out and would provide a relatively scientific basis for practical prediction of concrete creep.