Applied Mechanics and Materials Vols. 580-583

Abstract: The treatment of the urban sewage and the Organic industrial wastewater has been transformed from removing of the organics to the Removal of organic matter and nitrogen, phosphorus. According to the deficiency of the Traditional wastewater treatment process,the micro-pressure inner loop reactor is put forward to solve the Anaerobic, anoxic and aerobic environmental issues in this paper. Aiming at the newly development of the micro-pressure inner loop reactor, based on the methods of Computational Fluid Dynamics, using the methods of computational fluid dynamics, By analyzing the velocity distribution field, flow lines, the gas volume fraction and other factors, the result shows that the reactor Meets the actual needs of the project, and provides a theoretical basis for practical engineering equipment.

Abstract: Human comfort is of great importance to main powerhouse and vibration level should be controlled below the human comfort limit. Comparison of ISO2631/1-1985 and ISO2631/1-1997 was performed firstly in this study. It points out that weighted root-mean-square acceleration is basic variable for vibration evaluation. The reduced comfort boundary of 2 hours (0.260m/s²) in 1985 version is very close to the comfort threshold (0.315m/s²) in 1997 version. Above two values were selected as human comfort standard in this paper. After that, 3D dynamic finite element model of HongPing pumped storage station was established and vibration analysis under pressure fluctuations was conducted using time history method. The calculation results indicated that vibration of generator floor was mainly caused by the multiples of runner blade number frequency. Vibration level of generator floor would not lead to human discomfort.

Abstract: The working performance of gravity dam with an anti-arch shape differs from that of conventional gravity dams. To understand the working performance of anti-arch segments on the bank slope of Xiangjiaba dam, linear and non-linear finite element methods were used to analyze the deformation, stress as well as the state of transverse joint and cracks during the operation period. The coefficient of anti-sliding stability of each dam segment and the safety degree of dam body were also calculated. The results show that under the conditions of non-grouting of transverse joints and well grouting of cracks, the deformation rules are consistent for all segments investigated and accord well with that of the conventional gravity dam. Both the dam heel and dam toe are subjected to compressive stress. In the cold seasons, there is a tensile stress region on the top of the dam body, where the tensile stress is smaller than the tensile strength. The transverse joints are opened, while the cracks are generally closed under compression and stable on the whole. The anti-sliding stability coefficient and the safety degree of each dam segment are above 3.0, which satisfies the design code.

Abstract: Engineering geology survey was carried out on the reservoir engineering of Yellow River water diversion and irrigation area, main engineering geology problem including leakage problem of reservoir area、shore stable and siltation problem around the reservoir、siltation problem of storehouse district, connected the river course and the pilot, water leakage river course、earthquake liquefication and immerse and salinification were analyzed and appraised, the corresponding project measure was proposed against the infiltrates of the storehouse district.

Abstract: The study on calculation method of earth pressure around the circle of large cylinders will be deduced in this paper. The arch effect of soil is introduced into study. Considering the soil arch effect, different stress sections appear in the soil between two cylinders due to the change of stress state. Equations are established respectively in these sections and the analytic solutions to the equations are obtained

Abstract: The quality of river water has been an important issue, due to its significant important function to the human being. In Asia, Malaysia is considered as one of the most speedily urbanizing countries and it’s facing huge environmental challenges. An increased pressure on urban areas has been generated by rapid manufacturing especially in the Penchala River Basin. Penchala River originates from Kiara Hill and passes through several important townships as it flows through residential and industrial areas before meeting with Klang River. Although the river is relatively short, with an approximately 12 km in length with a catchment area of 28 kilometer square, this catchment is noted to be under environmental stress emanating from storm water pollution, solid waste, sedimentation and micro-pollutant. To study the water pollution issue, it is always best if it is tied up with the geographic information system. The objective of this study is to use the GIS for preparing and organizing the geometric data to satisfy the water quality model requirements. As a result of this study, a digital map for Penchala River has been created.

Abstract: Data mining model is the most important technical basis of the control target decomposition for the most stringent water resources management of Shandong province. K-means clustering model is adopted to analysis the water withdrawal of industrial added value per ten thousand yuan in 2010. Based on the yearly industrial water consumption trend from 1995 to 2010 of 17 municipal-level cities in Shandong province, the ARIMA (p, d, q) model is established through a lot of fitting and optimization and then the regional industrial water demand and water utilization efficiency in 2015 were forecasted. According to the proposed principal and technical route of target decomposition, the industrial water utilization efficiency target in 2015 of the whole province and 17 municipal-level cities are defined respectively.

Abstract: It does numerical analysis on the overload of RCC arch dam named wanjiakouzi, through the analysis, we try to find the damage process of the dam. It does elastic-plastic analysis by FEM. Result shows that the horizontal cracks are usually a very important symbol, it means the dam will reach its ultimate capacity.

Abstract: It is possible for hydraulic engineering located in high intensity earthquake area under the action of extreme disaster induced by earthquake and secondary slide surge. Several impact action models of slide surge were introduced and the damage evolution of concrete gravity dam subjected to combined action of different sequences of earthquake and secondary slide surge were studied based on nonlinear numerical analysis. The effects of different time sequences of combined earthquake and slide surge were compared and the safety performance analysis was performed. The results show that the combined form has great effects on the damage evolution law of concrete gravity dam.

Abstract: By two-dimensional nonlinear finite element strength reserve coefficient method and the rigid body limit equilibrium method respectively, a comprehensive study of the stability of the 12th sluice section of XiangJiaba hydropower station is made and some conclusions of the instability mode and the lack of safety are reached. The reinforcement measures, which set up concrete cogging at the dam heel and put up additional drainage holes at the stilling basin,are proposed and calculated by the strength reserve coefficient method and the rigid body limit equilibrium method respectively again,Results show that the dam foundation safety meets the code’s standards if the . reinforcement measures are adopted.