Advanced Materials Research Vols. 446-449

Abstract: The terrain of Chunyashu gully in Dujiangyan city of Sichuan province was steep, plenty of loose material increased after the Wenchuan earthquake. Debris flows were triggered in September 2008 and August 2009, and the debris flow was a serious threat to the highway and the residents. Risk of Chunyashu gully debris flow had been analyzed by the latest assessment method, and the result was that the risk degree of this gully was middle. Finally according to the local situation the control measure of interception dam and other advices had been suggested to protect the safety of the residents.

Abstract: Taking mining region No. 3 of Danhou Coal Mine, located in Yu County in Hebei Province, as the engineering background, the 3D visual model with three aquifers of mining region No. 3 was generalized and constructed by using SURPAC software based on the geologic drilling datum. Then 3D numerical model and its meshing were completed with the MIDAS/GTS-FLAC3D coupling modeling technique. Considering the complicated hydrogeological and mining conditions, two practicable mining sequences to No. 5 & No. 1 coal seams were designed respectively. Through fluid-solid coupling computation, the response characteristics of deformation field, principle stress field and plastic damage were analyzed during the dynamic mining process, and the mining sequences to No. 5 & No. 1 coal seams were optimized. The reasonable mining sequences provide the basis for mining safety to mining region No. 3.

Abstract: For assembly monolithic floor, this paper presents a new idea, that is "precast concrete hollow slab + post-pouring belt ". It reduces the cast layer on the traditional laminated board. The post-pouring belt is pour in the joint parts of beam and board, board and board in order to realize the integrity and ensure the whole stiffness of the floor. In this paper, the vertical force performance of the assembly integral floor is analyzed by using ANSYS finite element program, and the result is contrasted with experiment. A reasonable calculation method of the fabricated floor deflection is suggested.

Abstract: The loess landslide in BaDong city, HuBei province China suffers great losses, which is an extremely typical landslide disaster. Variation in water level in the Yangtse River and rainfall has enormous influence on the loess landslide disaster. Some tests on loess have been done, which mainly include water content influence on shear strength of the loess, the relation between water content and dry density etc. The results have shown that When the water content average increasing with 3%, the cohesive strength reduces with 57%，49%，54% respectively and the internal friction angle average reduces 43%. The bigger the water content, the bigger the shear displacement at the same imposed load. When water content average increases with 3%, the corresponding maximum shear stress reduces with 50%, which may be in favor of loess landslide disaster prevention.

Abstract: This paper presents an effect method to reveal the load transferring and sharing law of anti-sliding piles under different isosceles trapezoid sections. Three kinds of cross-section, including the rectangle and two typical kinds of isosceles trapezoid cross-section, were carried out the load transferring and sharing tests on the basis of soil arching analysis by using the numerical modelling method. The results show that the anti-sliding piles row play an important role in resisting the driving force of the landslide, and the outer-isosceles trapezoid cross-section piles can reduce the driving force of the sliding mass in front of the piles to the maximum extent. The monitoring positions where more close to the piles transfer larger driving force from the soil to the piles. Moreover, the mechanical mechanism the anti-sliding piles with outer-isosceles trapezoid cross-section is end-bearing pattern, while the anti-sliding piles with rectangle and outer-isosceles trapezoid cross-section are end-bearing mixed with friction pattern.

Abstract: The synthetic risk assessment method incorporating the severity and the possibility is used to identify the catastrophic event sequences in power system. The weight setting of each severity index is determined by the proposed entropy weight method. Comparing with traditional methods, the entropy weight method can determine the weight coefficients objectively. The simulation results for the WSCC-9 buses system have proved the validity of the proposed method. This method can be used in the practice power system.

Abstract: The paper presents an integration of a Geographic Information System (GIS) and Multiple Degree of Freedom (MDOF) model for structural dynamic calculations. The input data of MDOF is stored in the format of spatial data model in GIS with 2D and 3D with the help of Google SketchUp. The output data of MDOF can be viewed in both 2D graph and 3D visualization after simulation calculation in GIS. A case study of dynamic response of campus buildings is presented to illustrate how the GIS-coupled system has been developed. Results show that the proposed GIS-model integrated system can perform a large number of dynamic responses of MDOF affected by earthquakes, promote better earthquake resistant behavior of building structure in urban regions, and thus optimize hazard assessment, vulnerability estimation and seismic risk reduction.

Abstract: According to the systematic analysis of the composition and destabilized mechanism of debris landslides, this paper have hydro-geological conditions of the landslide and rainfall combined, research the changes of Unload-load response ratio (ULRR), which is considered as the displacement dynamic parameter of debris landslide in the water environment of different roles and conditions. To further explore the stability and its instability law in different stages of the landslide, establish the ULRR-rainfall coupled warning model in order to improve the accuracy of landslide prediction greatly. Meanwhile, based on the example of Xintan, use the ULRR-rainfall coupled warning model to evaluate and predict its stability. The Evaluation and prediction results match the evolution of slope stability. All results above prove that the ULRR- rainfall coupled is a very effective and reliable new method in the forecast prediction of the debris 1andslide．

Abstract: The selection of central emergency shelter site is the key to setting emergency shelter system in cities or towns. Nine central emergency shelter indexes have been examined based on evaluation indicators including land safety, size of site and disaster prevention and rescue facilities, and thus evaluation criteria are established. This paper proposes a single-object location model based on the weights of known properties of an ideal point according to the criterion of pessimism. This model can reduce decision-making risks and simplify the process of finding a solution. Finally, the effectiveness of this model is tested taking the selection of a central emergency shelter in a city as an example.

Abstract: Vibration problem has been destroying the harmony between human being and nature. In order to analyze the effect of vibration on human body, twenty subjects were exposed to random vibration in fore-and-aft, lateral direction in standing position. The accelerations at head, abdomen and leg of each subject were measured. The response was analyzed by means of acceleration sat the measured points and their Fourier spectra and transfer function. The results show that the response curves of all of the subjects in the same direction are substantially the same. The resonance frequencies decreased in different degree. A principal resonance peak around 0.6Hz at different body parts of the same subject. The research results can provide a reference for human body modeling and human comfort evaluation.