Advanced Materials Research Vols. 838-841

Abstract: Loess with large thickness is widely distributed mainly in Gansu provinces of China. The kind of loess has special microstructure to induce lower dynamic strength and larger seismic deformation. It brings to difficult loess processing challenges for engineering building foundations or high way and railway constructions. The large deformation dangers could induce to serious seismic subsidence, watering deformation or loess landslip. There have been series problems of how to change its natural microstructure for engineering demanded which is major concerned in this paper. We put forward Phosphoric modified methods to treat loess problems. By changing different proportions of adding filling materials, such as Calcium carbonate, barite, talcum powder, and others auxiliaries including phosphoric acid and barium metaborate, found it get to be better effect. It’s dynamic deformation coefficients dropped lower than 2‰. After loading test, the methods prove to be greatly enhanced loading strength and changed its unreasonable microstructure. Because of no toxicity materials be adopted and produced during course, the method can be popularized and applied.

Abstract: The energy dissipation design method has received more attention by engineering circle. Nowadays, the buckling restrained braces (BRBs) are used in higher structures being dissipation energy components. So, it is very necessary to determine the damage quantity of BRBs under earthquake. Firstly, the meaning of the damage quantity of BRBs is clarified based on the energy theory. Secondly, a single degree of freedom analyses model which is suitable to the frame structure is proposed. The nonlinear dynamic time-history analysis of BRBs system is carried out by using FEMS software of ANSYS 11.0 and seismic response of BRBs is obtained. Finally, a practical calculation model of the Damage quantity of BRBs is established. Using MATLAB software, the Damage quantity of BRBs is obtained.

Abstract: The dynamic Davidenkov model is used to model dynamic characteristics of soils, and plastic-damage model is used to model dynamic characteristics of station structure concrete. So that, considering the influence of soil-station structure interaction for 2D finite element analysis, the dynamic interaction of soil-station structure is modeled. The damage characteristics and energy response of station structure under seismic motion is analyzed. The result shows that damping energy and hysteretic energy are monotone increasing under ground motion, and the seismic characteristic has significant effect on the energy response of subway station structure. Furthermore, concentration effect of hysteretic energy of subway station structure is measured by hysteretic energy density. It is found that the hysteretic energy is the most centralized in the column, so the dynamic response of the columns is the maximum. Furthermore, the nonlinear damage evolution law of station structure is analyzed. The law of local and global damage index is consistent essentially, and the damage index is increased by the effect of accumulative deformation.

Abstract: Compared with the cities, Chinese villages and small towns have many problems, so the threat of seismic secondary fires disaster is larger than that of the cities. The characteristics of seismic secondary fires disaster in villages and small towns are fire sources great and fire spreading rapidly. Based on the present situation in China, this paper gives seismic secondary fires disaster chain of evolutionary flow. Combined with single house fire and fire spreading in region, it puts forward the risk analysis model.

Abstract: This paper, through introducing dynamic time-history analysis and the calculation by acceleration response spectrum theory as well as making a contrast between them, provides typical approaches and calculation examples of parameter determination in designing anti-seismic sphere bearing about bridge in high-intensity earthquake area. Quantitative analyses are made on the force of installing sphere bearing in high-intensity earthquake area. The deficiencies of employing sphere bearing in high-intensity earthquake area are introduced based on structural features as well as data and corresponding solutions are offered.

Abstract: As an important part of earthquake disaster relief, highway traffic system is the passage for rescue staffs, material transport and evacuation. Hence, people are concerned about destruction condition and safety of highways after earthquakes. However, there are neither systematically scientific methods to classify highway subgrade seismic damage, nor systematic study on its rapid evaluation methods. Therefore, the Paper studies post-seismic highway subgrade damage grade and rapid evaluation methods, to be as a significant reference for improving post-seismic emergency rescue and relief efficiency, as well as for recovering and reconstructing highway traffic system.

Abstract: Through calculation of the seepage finite element, the result shows that the anti-seepage effect of clay core and grouting curtain is obvious. The phreatic line of dam conforms to the general law, and seepage stability of the dam meets the requirements. The sensitivity analysis of the different curtain depth indicate that there is a inflexion on the relation curve of seepage discharge and curtain depth, and to deepen continually the curtain have less effect on the dam seepage discharge when the curtain more than 50m.

Abstract: Due to the geological complexity of the wide reservoir area, reservoir leakage problem has been the subject of Research in Water Resources and Hydropower Engineering. In recent years, the development and application of GIS (Geographic Information System), remote sensing technology and three-dimensional (3D) technology, have provided a powerful tool in analysis of the reservoir leakage problem. Based on the 3D remote sensing image visualization system created with remote sensing technology, GIS, 3D technology, this paper studies the leakage problem of a reservoir. By analyzing the terrain data, we can find the might existing leaking channels combining, combining lithology, geological structure and hydrogeological conditions. Then calculate the leakage quantity to evaluate the reservoir leakage. With the characteristic of accuracy and timeliness, the system will play an important role in preliminary analysis of reservoir leakage problemas well as forecasting decision making.

Abstract: This paper studies the particle size distribution (PSD) and final effluent quality in the activated sludge process. The PSD of final effluent and mixed liquor were determined, and it was found that the settlement in the process can remove particles between 100μm and 200μm easily, while difficult to remove the particles between 13.5μm to 65μm, which was in the supracolloidal (1-100μm) range and could cause problem at higher flows. The final effluent quality was measured by turbidity. The relationship of PSD-10 with turbidity, was analysed and the formed links were paired. Therefore, the PSD can be linked with final effluent quality and can be expected to use as an index to evaluate the final effluent quality future.

Abstract: Jin 45 block has entered the later period of cyclic steam, Transforming the development mode is imminent,there is a big technical risks in the development of cyclic steam of edge and bottom water of heavy oil when it turns to steam flooding development, it is needed to understand the characteristics of Edge-bottom water which invades in reservoir and master the restricting factors of invasion of the edge-bottom water,to avoid the risk of steam flooding development reasonably and effectively. The experiment uses the three layers of inhomogeneous Artificial core which has high permeability transition zone of simulative edge water on the edge. Analysis the factors of differential pressure, temperature and distance of the water and bottom water to the effect of Edge-bottom water encroachment sensitivity. The results show that: Among many factors of water encroachment sensitivity, the effect of differential pressure to the regularity of water invasion is most obvious, at the stage of Connection of water invasion, the differential pressure has a little effect on the Instantaneous water influx, After the channel of water encroachment has formed,Instantaneous water rate and differential pressure is index function relation, in the late of water invasion, the instantaneous water rate is stable. The result provides the basis for the heavy waterflooded area turn to steam flooding.