جستجوی مقالات مرتبط با کلیدواژه « hydrostatic pressure » در نشریات گروه « عمران »

Severe hydraulic gradients in open channels cause severe bed erosion and problems caused by sedimentation. Fabric concrete is a unique product with high execution speed that can replace traditional concrete surfaces. According to the mechanical resistance parameters of this product, in addition to its good durability against corrosive factors, one of the applications of fabric concrete is its use on the surface of canals and water course culverts. In this research, first, the flow of open channels in trapezoidal section is simulated under 9 scenarios, which include 3 common channel geometries in the state of a straight path, a path with bends and deviations, and finally, a channel path with a change in height at the bottom of the channel. In each of the states, 3 different flow regimes have been investigated along with flow turbulence modeling using flow-3d software.Different flow regimes have been investigated along with flow turbulence modeling using flow-3d software. Using ABAQUS software, fabric concrete components and their connection areas have been modeled, and by applying forces equated to the concrete surface and vulnerable connection areas, the amount of created stresses has been checked. The results show that the created stresses are very low compared to the tensile and compressive stress capacity of fabric concrete. In order to validate the hydraulic studies of flow and concrete, the relevant laboratory results have been used.

Unscientific waste control and using inflamed masks and gloves in municipal garbage represent a risk of an outbreak. Furthermore, in growing nations, pollutants of the surroundings and groundwater have raised the call for landfills to decrease pandemic risk. Alternatively, municipal strong waste landfill barrier structures regularly contain an aggregate of geosynthetics and mineral layers. Throughout the last 20 years, there were full-size studies on the interactions among the substances and on the overall performance of the geosynthetics consisting of components of durability. This study has led to giant advances in the layout and specification of landfill lining structures. Although many numerical modeling applications are implemented to assess lining system stability and integrity, records to validate those models are presently limited. This paper highlights the records required to validate numerical models and instrumentation strategies that can be used to accumulate this information imposed at the liner (stress cells). The use of numerical analysis to analyze the stability and integrity of landfill liner systems has increased popularity over the last three decades. Internal landfill pressures, on the other hand, are emphasized by the majority of them. The presence of water flows behind the landfill side slope was investigated in four height level codes. The results are compared to on-site landfill data in order to validate the numerical model. This case study is the Miligate dump in the United Kingdom. The Finite Element (FE) model in three dimensions is used. To improve the accuracy of the study, the interfaces and properties of the materials were chosen from the experimental results. The findings revealed that a lining system with a water level up to 3/4 of the side slope was immune to failure, but that when the side slope was filled with respect to the full height, the geomembrane would be ripped.

Large dams store a significant amount of water behind them. Therefore, their safety and stability control have a special place. Changes in temperature and hydrostatic pressure are the most important factors that affect the dam structure; And will cause shifts in the crown of the dam upstream and downstream. Therefore, the data obtained from the monitoring center should be evaluated regularly in order to analyze the behavior of the dam. Due to this issue, in this study, using artificial neural networks, a model is presented to predict the horizontal displacement of the Dez dam crown due to changes in pressure and temperature. According to the results, it is observed that the neural network has a good performance in predicting real values. The average error of the modeled network is about 4%. This indicates that the network is well trained. Using the generated network, the radial displacement changes against the reservoir water level for different temperatures are obtained, and plotted. Using diagrams, it is possible to predict the behavior of Dez dam for different temperatures and changes in reservoir water level, which can be very useful in monitoring and maintaining this dam.

In this study, the effect of soil material parameters including soil specific weight (γ), cohesion (C) and angle of internal friction (∅) and geometric parameters of slope including angle with the horizontal (β) and slope height (H) on factor of safety (Fs) are investigated. Slope factor of safety is considered in two scenarios: (i) slope with dry condition and (ii) slope with steady-state saturated condition that comprises water level drawdown circumstances. In addition, the type of slip circle investigated. For this purpose, the limit of equilibrium method (LEM) is implemented. Results indicated that, decreasing of water level and omitting the hydrostatic pressure on the slope, would result in safety factor decrement such a way that with drawdown of 5.5 m water level, the factor of safety decreases about 41.42 % and also the type of slip circle is changed. Comparison of the plane and circular failure surfaces showed that plane failure method has good results for near-vertical slopes only. Determination of clip type showed that for β〖60〗^o only toe circle can happen. Application of the LEM in Bishop’s method resulted the values of R2 and RMSE equal to 0.93 and 0.121, respectively that the error of this method is 1.3% respect to other methods, which can be neglected in comparison with the complex and accurate methods.