Advanced Materials Research Vols. 655-657

Abstract: Based on soil structural view, the mechanism of loess structure is analyzed in humidification process. The concept of the loess structure loss is proposed.And quantitatively parameter described the loess structure loss is set up, that is structure loss parameter. And then the influence laws of humidification and loading on loess structure loss are discussed. The results show that structure loss parameters is increasing with the increase of the humidification water content. The moistening collapsibility has a good linear relationship with loess structure loss parameters.

Abstract: Solar energy is a renewable energy source nearly in exhaustible and pollution-free. Tibet provides little normal resource, however it is abundant with the richest solar energy in our country. Many researchers spent a lot of time to improve the living standard of peoples who lived there by utilizing solar energy, which contribute a lot to the development of Tibet, however, few researches related on the solar house in buildings located above 5000m. The field measurement of a solar house built above 5000m was carried and its effect was presented and analyzed in this paper, which could contribute the study of solar house in the condition of extreme cold zone and low pressure environment.

Abstract: Foam sandwich beams with sine-curve skins subjected to large deflection were studied using finite element analysis, in which damage mechanisms of face sheet were introduced. Sandwich beams with various sinusoidal skins were simulated and results indicated that corrugation could make the deflection and energy absorption up to face fracture increase remarkably compared to the counterpart with planar skins.

Abstract: GPS-RTK technology with real-time , high positioning accuracy and easy to operate features, is widely used in the filed of surveying and mapping; With the improvement of RTK technology, the initialize speed , results accuracy and reliability of the RTK survey will be increasingly higher.Due to the impact of the satellite signal and the external environment, the deviation of the RTK positioning and the lack of necessary checking conditions in RTK surveying, this paper will do some researches and analyses about RTK positioning error to serve the Survey and Mapping Engineering better.

Abstract: The rigidity-step-change method is set up by Mechanics of Materials. Its distinguishing feature is at the steps of solving the deformation problem. It changes a deformation body to a rigid body before the solution of deformation of the body is get which fitting together with another. Then, step by step, it gets answer by Superposition Method. The main content of Conversion Method is at which the elastic axial line of the conversion beam substitutes the beam which being conversed. And the solution of deformation of the conversion beam could be found easily. In solving the elastic statically determinate frame, it uses the rigidity-step-change method and Conversion Method at suitable steps. It has good qualities for finding solution of the slope of the frame with simple support beam. Only primary computation is need. The steps of solution of the frame slope are given by an instance.

Abstract: Xiaolan channel super large bridge is a stucture type adopted in the passenger dedicated railway line for the first time, and the longest span bridge of the passenger dedicated railway line, also the longest span bridge of the high-speed railway in the world with a total length of 7686.57m.. At first, the author compiles APDL command flow program by using the unit birth-death technique, establishes simulation calculation model in the construction process. The creep characteristics of concrete are also taken into account. The whole process of beam first-to-arch later stage construction are calculated and studied. Simulation Calculation and construction control research of Xiaolan channel super large bridge shows that construction control method is reasonable, the calculation program which is used in the paper is right, and using three dimensional substantiality finite element method and “element birth and death” to simulate construction process conform to reality. The bridge is safe in the construction of beam first and arch late.

Abstract: Studied the thermal Characteristics of phase change materials (PCMs) packed module using in the floor heating. Through simulating the storage /discharge process of PCM packaging module by software FLUENT, the influcences of PCM in heating floor on heat transfer、inhibiting temperature change、adjusting the floor surface temperature have obtained .Considered meeting the conditions for the use of floor heating and the needed time of storage /discharge energy, maintaining uniformity of surface temperature, maximizing the function of PCM’latent heat and so on, the relationship between the distribution of Phase change rate with the time of storage /discharge、heating conditions and the utilization have been discussed.

Abstract: This article introduces all kinds of combining forms of the monomer space through the combination changes of monomer container, researches and designs the multi-functional monomer space. Then it analyzes the structural component and accessory framework inside the monomer space, gets a variety of building forms and discusses the specific application of the container in the buildings, thus making the modular design of the container integrate with the commercial buildings and improve the practicability of the monomeric container in the space design.

Abstract: Basing on diffusion radius formula of pressure grouting which was deduced by the Darcy's law in groundwater dynamics and connecting with engineering example, this article introduces the construction parameters and analyzes results of pressure grouting. Several methods including Re-grouting, coring method and SPT were used in the effect detection, it turns out that the slurry owns a consolidation and filling effect around the grouting holes when it is injected into soil. This effect can reduce the porosity and moisture content of soil, then the foundation bearing capacity is improved and the settlement can be reduced. Practice has proved the feasibility of pressure grouting in repairing soft foundation of important buildings, so it is a valuable reference to foundation reinforcement under similar conditions.

Abstract: For expressway slope protection more and more people advocate ecological idea presently and use plant protection mainly, but great differences between plant protection and engineering support are exist, especially protection effect is remain to be verified by time. Combined with plant protection of expressway slope in henan province, we found that great common grounds and problems and some suggestions have been proposed.