Advanced Materials Research Vols. 1065-1069

Abstract: Because of the narrow condition of bridge approach embankment, the large compacting machines can not use in the embankment construction. The differential settlement between abutment and approach embankment was easy to produce. Coupled with the the structural differences of the abutment and embankment, how to ensure abutment stable and prevent bridge head bump has been an engineering roadblock in the abutment approach embankment filling engineering. The key factor to solve the problem of the roadblock is reducing the horizontal thrust of embankment on abutment and the difference in settlement between road and bridge. Test results showed that liquid fly ash is a new lightweight value material of self-compacting, which has higher strength, stiffness and smaller density. Using liquid fly ash as the bridge-approach embankment filling material can effectively reduce the horizontal thrust of embankment on abutment and decrease its own settlement deformation. ANSYS computational analysis showed that when we use liquid fly ash filling the bridge approach embankment, the horizontal thrust of the same position will increase with the increase of the filling height, and the value is lesser than the horizontal thrust of soil filling subgrade. Pavement settlement increases with the filling height increasing, but it is significantly less than the general soil filling subgrade.

Abstract: The city of Tibau do Sul, a popular tourist destination in Rio Grande do Norte state, is famous for its sea cliffs, which reach a maximum height of 50m. However, mass movements are causing them to retreat. The aim of this paper is to study mass movements and their causes on the coast of Tibau do Sul, in order to better understand cliff dynamics and assess the constructive potential of the surrounding land. Field work was undertaken to characterize the area and analyze slope stability using the Hoek and Bray method [1]. The effects of height, inclination and ground cohesion were analyzed for stability.

Abstract: The cusp catastrophe theory was introduced to the evaluation of the global safety of a system of an arch dam and its foundation, and the relevant quantitative instability criterion was established. Based on the overload nonlinear FE analysis of a planned arch dam, the global safety degree of this arch dam was 2.75 according to the instability criterion of the cusp catastrophe model of plastic strain energy, and the evaluation result was in agreement with the transfixion criterion of the plastic yield area.

Abstract: Rapid increase of energy consumption greatly restrains China’s sustainable development. Pump station is one of the high consumption systems in national economy. However, issues in design and management like low availability of equipment, unreasonable selection of water pump and no reactive power consumption capacitor lead to waste of energy and low efficiency of pump station, which shall be resolved during innovation of energy saving technology. Beginning with the current status of the pump station and through analyzing current problems, technology improvement measures are put forward in this paper such as expansion of irrigation area and performance adjustment of water pump. The sample evaluation is treated in a normalized way to get the optimal policy for energy saving technology innovation solution and achieve better economic benefits.

Abstract: In order to describe the stress-strain characteristic of the geotechnical dielectric material in the Huanggou pumped storage power station, using the samples taken from the construct site, the consolidation-drained shear test is carried out. Combined with Duncan-Chang model, the test results are analyzed to obtain the parameters of the model. Based on this, the Normalized Behavior is studied, and The results show that the normalized degree is highest when used (σ₁-σ₃)_ult as normalization factor.

Abstract: Due to the complexity of bed form morphology and dune movement, this paper selected a series of 2-D asymmetric dunes in order to address the development of a flow region associated with velocity profile characteristics and sediment incipient motion under shallow water condition. Experiments were conducted over four asymmetric dunes of one crest length (4 m), two crest height (0.3m,0.4m) and two uniform sediments with mean grain sizes D=0.5 and 0.7 mm at the TianJin Research Institute For Water Transport Engineering, China. By using Acoustic Doppler Velocimeter (ADV), the instantaneous velocities were measured at four cross sections giving a total of 16 measured profiles. The variations of velocity profile along the flow affected by the wavy bottom have been studied. The results show that the effect of flow acceleration plays an important role in governing incipient motion over dunes.

Abstract: Coupled vibration of water and stop log gate in the layered water intake structure will occur under the condition of the sudden load changes. A fluid-structure interaction (FSI) finite element model of the layered water intake structure of a hydropower station was established by using the finite element software ADINA to simulate the process of power on and off and the FSI phenomena of stop log gate during each process, and also verify the security of the scheme. The results show that fluid-structure interaction has a significant impact on the running of the layered water intake.

Abstract: The paper represents the models of subsidence sinkhole in soils around reservoirs in karst region. There are three essential conditions of the formation, such as cavity-fissure, overlying soils and groundwater dynamic. It leads to subsidence sinkhole based on three conditions when reservoirs change the underground hydrodynamics with regulating water. With the change of the surface water level controlled by reservoirs, the groundwater level alters, meaning to break the initial balance of sinkhole formation mechanism. Five models are established to describe the general mechanism change of groundwater hydrodynamic in this paper.

Abstract: Located at a narrow and deeply-cut valley in the middle reach of Yalong River in Southwestern China, the Kala Hydropower Station is subjected to serious seepage and leakage problems due to complex geological conditions at the dam site. A numerical method combining a substructure technique, a variational inequality formulation of Signorini’s type and an adaptive penalized Heaviside function (short for SVA method) was adopted for the simulation and assessment of seepage control effects at the dam site in Kala Hydropower Project. Numerical modeling of a typical overflow dam section and the whole dam site demonstrated that the primary design was a proper scheme for seepage control, and furthermore, optimization of the seepage control system can be performed in designing the layout.

Abstract: In this paper, the new Fengman gravity dam is numerically simulated to study the seismic response and safety evaluation by considering the different strength grade concrete partition, corridor, a discharge hole and gate pier. A complex 3D FEM of a real overflow monolith was built by taking advantage of AutoCADand ANSYS, nonlinear seismic response was studied under earthquake loads. Numerical simulations show that acceleration, displacement and stresses of dam were obtained in a complex 3D FEM under seismic precautionary intensity of 7 degree earthquake loads, results compared with the dam simple models were on the safe side. Fengman dam was still safe under seismic precautionary intensity of 8 degree earthquake loads, so the dam had enough capacity to resist earthquake action. At the same time, it is concluded that 3D dynamic FEM is very important for safety evaluation of concrete gravity dam subjected to the earthquake. The research provides finite element analysis reference works for comprehensive governance and reconstruction of Fengman Hydropower Station.