Advanced Materials Research Vols. 594-597

Abstract: Fires in high-rise residential building were studied experimentally by using an actual building with similar inner structure. The temperatures in the building interior corridors, elevators and staircases exit were measured. At the same time the fires in this construction were simulated by using FDS (Fire Dynamics Simulator) software, the variance trends of the temperatures in different positions within high-rise residential building were studied and compared with the experiment results, and the results of this simulation are proved to be valid. The results can be used to support the study of effectively controlling of the smoke spread and evacuation in high-rise residential building.

Abstract: Spontaneous combustion of coal is a serious threat to the normal working of the mine and the safety of miners, the research to prevent spontaneous combustion of coal has a great significance. Technology based on the three-phase bubble theory, combined with characteristics of coal of 7312-2 caving face of a coal mine in Xuzhou, using laboratory studies to determination the fly ash , Wong and a variety of surfactant , then determining the formula of three-phase foam which is fit for a coal mine coal, it can restrain goal spontaneous combustion effectively and beneficial to safety production and environmental prevention.

Abstract: The Dam Break model (DamBrk) developed by Fread was the most famous parametric dam break forecasting model with flexible inputs, and typically widely used for embankments or other man-made dams failure. The paper aims to discuss the parameter selection and calculation for natural dams, which are used as necessary input in The DamBrk model. And then the Tangjiashan landslide dams formed in 2008 Wenchuan earthquake is utilized to test the reasonability of DamBrk model. Outcomes shows that computed outflow volume through breach coincides with the observed values in magnitude when appropriate breach times be assumed. The methods put forth herein can also be helpful for the early warning and human evacuation of other natural dams.

Abstract: The rock slope stability under blasting excavation disturbance is an important study content in the fields of hydropower, mining, transportation and other research field. Basing on a potential slip rock mass of the left slope of Jinping-Ⅰ Hydropower Station, using Sarma method of the limit equilibrium analysis and orthogonal experimental design, the paper analyzed the main factors which affect the slope stability, and studied the sensibilities of the slope stability to various factors under blasting disturbance. The results indicate that the slope stability under blasting disturb is very sensitive to the change of internal correlative of potential slip rock mass. The slope stability under blasting disturb is less sensitive to the change of external correlative factors which are result from the blasting.

Abstract: China is one of the most serious national which does harm to geological disasters, and the geological disasters have effect on China’s economy. Therefore, the effective evaluation for the economic losses caused by geological disasters has some reference value. This paper mainly introduces the geological disaster economic losses structure drawing and evaluated methods which include human capital method, shadow valuation method, market valuation method, investigation appraisal method and coefficient of proportionality method, and analyzes different economic losses should adopt different appraisal method. And take the Qianjiangping landslide for instant, this paper introduces how to evaluate landslide disasters economic loss. The idea and method have certain guiding significance to geological disaster economic losses evaluation.

Abstract: On the basis of investigation and relevant statistical analysis about the Huizhou traditional architecture, this thesis elaborates the current disasters and main problems of the Huizhou traditional architecture and puts forward the measures of preventing the disasters. A discussion has also been conducted in the feasibility of the methods on disaster prevention. The purpose of this thesis is to provide technical reference for reforming and enhancing the quality of the Huizhou traditional buildings.

Abstract: In order to study the horizontal pillar stability of Jinchuan No.2 mine area, the 13 factors and three levels of the numerical calculation orthogonal pilot program was devised. We had required the evaluation function of the 3 index which was averaging stress of horizontal pillar, Shear stress of horizontal pillar, Failure ratio of horizontal pillar, and used reliability theory to analyze reliability and risk prediction of the horizontal pillar stability. The results showed that averaging stress of horizontal pillar instability risk is 5.57％, shear stress of horizontal pillar instability risk 4.37％, failure ratio of horizontal pillar instability risk 8.222％, The stability reliability of horizontal pillar is 82.88%, and the instability risk probability 17.12%.

Abstract: Questions related to zonal disintegration such as difference between results from laboratory test and field monitoring test, as well as the effect of multi-axial stress level on zonal disintegration were discussed through numerical modeling by using a 3D numerical code called RFPA3D. Results show that the much smaller fracture spacing captured by laboratory test on zonal disintegration is due to the heterogeneity extent of the tested material. Zonal disintegration is an inherent character of heterogeneous rock mass, the more the heterogeneous the rock is, the larger the spacing between the adjacent fractures will be. The configuration of zonal disintegration is influenced by combination of stress level in three directions. Intact fracture rings can not be formed unless a nearly hydrostatic stress state exists in directions perpendicular to tunnel axis.

Abstract: According to the basis of analysis of stability evaluation and prediction of landslide research status, discusses the factors influencing the stability of landslide and slope stability analysis methods; analyzing advantages and disadvantages of neural network research method, operability of evaluation of landslide stability analysis, select average slope, slope of the invading front, sliding surface slope, the maximum annual average rainfall, the recent slide situation, human engineering activities as indicators of slope stability evaluation， has established based on BP neural network landslide stability analyses and applying Matlab toolbox to train network. The error analysis result indicate the sample training result and the actual situation tally basically, prove this model can tally with the project reality.

Abstract: Fire is one of the most severe hazards to which bridges may be subjected during their lifetime. In recent years, due to rapid development of transportation systems, as well as increasing transport of hazardous materials, bridge fires have become a concern. Bridge fires caused by crashing of vehicles and burning of gasoline are much more severe than building fires and are characterized by a fast heating rate and a higher peak temperature which could lead to bridge collapse. Bridge failures during a fire can result in the disruption of commerce and services, and most importantly the loss of human life. In this paper, thermal and structural behavior of a steel girder of highway bridge overpass in the East Bay’s MacArthur Maze in Oakland collapsed on April 29, 2007 is studied by using general purpose finite element analysis software ABAQUS. Finite element analysis results demonstrate that unprotected steel bridge may collapse untimely under some fire scenarios and it is necessary to consider fire safety in steel bridge design.