Advanced Materials Research Vols. 594-597

Abstract: Reviewed the various constitutive mode of concrete faced rock-fill dam. Basis on the complex physical characteristic of filled the material and the framework of dam, a method of computer is given, introduced into the program of the concrete face rock-fill dam calculation with FORTRAN language on the ANSYS software. It is used to simulate two and three-dimensional nonlinear computation and compute figure simulation in the construction procedure and operation period for the concrete face rock fill dam, the result was intuitionist clarity.

Abstract: Submarine pipelines located near harbour areas and in major shipping lanes are likely to be exposed to potential damage due to anchors and dropped object impact. To protect these pipelines, they are buried and protected with rock armour berms. The design of these rock berms has been traditionally based on model test results. In this paper, a simplified method is proposed to simulate the interaction between the anchor, seabed soil and rock armour, on the basis of the thrust earth pressure theory. The results agree well with the centrifuge test results.

Abstract: The unsteady seepage through earth dams is analyzed with the finite element method in this paper.Using this method, the seepage through Huangbizhuang earth dam is calculated. Many reasonable suggestions are posed to help the management and reinforcement of Huangbizhuang reservoir earth dam.

Abstract: Longitudinal cracks often appear on the top of the large locks’ floor built on soft foundations, but the cause can’t be explained by general design methods. Based on the simulation of lock’s construction and clay’s consolidation, the paper analyses the evolution process of the floor stress, and find the regular pattern of stress’ change over the time, then improves general design methods by omitting the floor’s deadweight when calculating the negative moment. The conclusion serves as a reference for the design and the construction of similar projects.

Abstract: In this paper, the currently available, feasible controlling measures for the deformation of foundation excavation and its surrounding environment are summarized systemically, which is mainly embodied in pit collapse, adjacent building differential settlement as well as underground pipeline cracking. Then first from the two aspects: artificial recharge used as prevention method and management measure separately, the paper illustrates the control principle, operation method and matters needing attention during artificial recharge. In addition, the difference between pumping well and recharge well are discusses. The research results will provide direction for the deformation control of deep foundation excavation and the operation of artificial recharge.

Abstract: Arranging spur dike at the exit of diversion channel significantly influences the safety of the downstream cofferdam and the scour of the downstream bed by changing the water velocity and turbulence. In order to compare the advantages of different arrangement of spur dike, detailed profiles of velocity and scouring are measured in laboratory flume. And water depths, surface velocity and the condition of downstream bed scouring are investigated at the exit of diversion channel at different arrangement. A new type of spur dike is designed, which is named as courter-arc vertical ladder spur dike. Through experiments on physical model, the new type of spur dike alters the direction of the outflow, decreases water speed and reduces downstream bed scouring and ensure high slope safety.

Abstract: The cause of the concrete pier cracks of Lushui Puqi Hydraulic Hinge in China is studied by FEM (finite element method). The transient temperature field and thermal stress during thermal shock are simulated, and the sudden decrease of air temperature is concluded to be the main cause. Then the probabilities of crack propagation during thermal shocks are discussed in detail based on LEFM (linear elastic fracture mechanics), the results show that cracks will propagate during another thermal shock of 10°C or more decrease. Mode I Stress Intensity Factor KI is adopted to describe and evaluate the concrete crack characters. Further discussion is made on the influence of time, temperature decrease and crack depth.

Abstract: This paper was combined with the third Huaian pumping station to study the dynamic characteristics of the bulb tubular pumping station. By using dynamic finite element analysis method to create Huaian pumping station modes. Then using ANSYS Model Analysis and harmonic response analysis, the vibration modes and dynamic response were researched deeply. According to the mode analysis results, the fundamental frequencies of upper pump house were determined for 1.36Hz and the fundamental frequencies of substructure were determined for 20.11Hz. The dynamic response of the bulb tubular pumping station structure under fluctuating pressures is calculated by ANSYS harmonic response analysis, and the results show that dynamic displacement satisfied the maximum allowable of architectural construction permission，so it can satisfy design requirement, which provides references value for other tubular pumping station in anti-vibration design.

Abstract: The maximum height of Dagangshan arch dam is 210m. Its geological conditions are complex. The basic seismic intensity of the dam is VIII. The crest value of earthquake acceleration that 100 years beyond the probability of 2% is 0.5575g. Using the rigid body-spring element method, this paper simulated Dagangshan arch dam’s abutment dynamic stability under earthquake action. Searching the governing sliding bodies and evaluating the reinforcement effect. The results show that under the action of earthquake, the left and right bank’s key slide blocks are L1 and R2 respectively. Before reinforcement, their minimum instantaneous dynamic safety factors dropped from 5.053 and 3.076 of static values to 1.045 and 0.922 respectively. After the pre-stressed anchor cable reinforcement on the left and right abutment, the minimum instantaneous dynamic safety factors of blocks L1, R2 are raised up to 1.091 and 1.145 respectively, meeting the requirements of designing value, the reinforcement measures are very effective.

Abstract: As a result of many high arch dams that are building and would be built in the south-west and north-west of China, arch dam is a kind of compressed thin buckle, not only effect by tension, but also by deformation. Thinner dam body with usage of increased levels of concrete and optimum designing, the local regions of high arch dams approach thin shell structure，which will lead to the structural buckling. Base on the above present condition, this paper would establish a series of generalized high and thin arch dam models whose height are 240m, and make theoretical analysis based on one of the crown- cantilever method- differential method for them, which attempts to provide a new method for the" critical flexibility coefficient ". At last, this paper would provide the relation between coefficient and buckling stability of high arch dam