Applied Mechanics and Materials Vols. 416-417

Abstract: Mass concrete technology has been widely used in the construction field. In engineering construction, the quality and construction technology of mass concrete are directly related to the quality of the projects. Thus, before the construction of mass concrete, a series of experiments should be made, and also the key points of the construction technology should be strictly followed in the construction process. In this paper, by taking the application of mass concrete in stadium project as an example, the test before the construction of mass concrete and the technical application in the construction are analyzed.

Abstract: The paper research building energy-saving technologies, in particular, phase change materials and traditional building materials combined into a new building material with a heat storage and heat. It has the energy density and the approximate constant temperature exothermic absorption, etc., can effectively maintain the comfort of the environment and reduce building heating and cooling energy consumption and costs. By collecting and analyzing the data in the the Model room temperature under infrared lamp irradiation, found that compared with the model of the phase change material without adding room, both the peak temperature of the maximum differential is 1.70 °C, the energy-saving efficiency up to 27.56%, with good energy savings.

Abstract: A series of undrained triaxial compression tests of saturated clays under different conditions were performed to study whether it is possible to determine parameters specifying Duncan-Chang model simply by using the physical parameters. The test results show that both the initial tangent modulus and peak deviatoric stress decrease with increasing initial void ratio and plasticity index of the soil under the same confining pressure. Whereas, they increase with increasing confining pressure of the soil with the same initial void ratio and plasticity index. A new synthesized physical parameter λ is defined based on the test results in this work. The functional relationships among the parameters K, peak deviatoric stress in Duncan-Chang model and the parameter λ are established to develop a modified Duncan-Chang model by considering physical properties of soil. In this model, only two input parameters, i.e., λ and the damage ratio Rf, are needed to predict the stress-strain relationships of the soil. In order to check the accuracy of the proposed model, laboratory tests were conducted to evaluate against the predicted results. The results show that the stress-strain relationships of saturated clays can be well described by the proposed model.

Abstract: In engineering practice, there is an increasing application of ram-compacted pile composite foundation for its economical and environmental consideration. In order to forward settlement property research of ram-compacted pile applied in high-speed railway deep soft ground treatment for the first time, and based on ram-compacted pile settlement data of trunk embankment near Beijing-Shanghai high speed railway Langfang station, this paper starts from 3D FEM analysis and provides the study on ram-compacted pile settlement characteristics. What more, settlement prediction using 3D FEM analysis is proved to be applicable and effective.

Abstract: From the analysis of the character of elastic wave through a rock medium, According to the safety driving problems faced in tunnel construction geological prediction, using TSP test data inversion of rock hardness, integrity and water characteristic parameters, the determination model of surrounding rock classification based on the variable fuzzy sets for surrounding rock classification. You can use the existing geological forecast means the achievements, with no increase in the additional cost method, the use of advanced, scientific method, in situ on surrounding rock grade determination, not only reduced the economic investment, and reduce the detection procedure, which have greatly improved invest. From detection technology investment and time efficiency compared to the original method, to guide the construction, save the cost, construction scheme design plays a positive role. This method not only has the profound theory value, but also has significant social benefits and huge economic benefits.

Abstract: To study the interface layer pasting mechanism of SRAP reinforcement technology, a multi-scale numerical model, which can simultaneously simulate the local microscopic damage and global macroscopic behavior of structure, is established according to the interface connection method among the models different scales. Based on the actual bridge reinforcement project, the nonlinear overall process of reinforced bridge is analyzed using the multi-scale model, and then the interface layer of reinforced bridge is simulated after the interface units of the bond damage function are determined. Results show that the calculation results by the multi-scale numerical model in the load deflection curve, bond interface layer slip of damage, and beam body concrete cracking model of actual reinforced bridge are consistent with the actual situation. With the multi-scale model, the actual stress of microscopic model is more accurately simulated, but also the overall performance of macro model can be more accurately controlled.

Abstract: Since the 21st century, the national economy of China has tended to fast develop, and the people's material life has been greatly improved. As the investment of the state in social infrastructure continues to increase, the domestic infrastructure construction has been in a rapid development, and especially the road and bridge construction projects have largely accelerated the development of the transportation and also the growth of the national economy in China. In the meantime, the geological conditions encountered in highway engineering are more and more complicated, so the requirement on the construction technology is continuously higher and higher, and finally certain difficulties are caused to the construction. In this paper, the construction technology of the graded granular cushion at the bottom of the subgrade in highway engineering is studied and discussed specifically.

Abstract: In water conservancy hub projects, an analysis of the downstream river channel evolution is a very important management reference. Through the construction of the mathematical model for riverbed evolution and also using all original parameters, the evolution trend of river channel can be simulated, providing an important reference for management and maintenance, and also proving the deduction of the mathematical model can keep consistent with the actual trend.

Abstract: Concrete-filled steel tube, as a main bearing component, can be temporarily used as the building support of other components. In this paper, the key and difficult points in the construction of concrete-filled steel tube in underground civil engineering, how to use the key technologies in the construction process, and the quality control problems and development prospects are mainly introduced.

Abstract: The artificial fish swarm algorithm adopts a new top-down way of think-ing,starting from the realization of individual behaviors of artificial fish and then re-aching the global optimum of the group through the local optimization of fish individuals of the group.Based on the finite element analysis softwareMSC.Marc, this article makes inversion analysis for mechanical parameters of dam.By combining the monitoring data of a dam,inversion analysis [ is made on the elastic modulus of the dam body,dam foundation,both dam shores and the fault fracture zone by using the artificial fish swarm algorithm.Results show that using artificial fish swarm algorithm to make inversion analysis on dam mechanical parameters not only has faster con-vergence rate but also have higher accuracy.