Analysis On Reliability Of Numerical Simulation Of Diaphragm Wall In Deep Groove Construction On Hydropower Station Dam Foundation

It’s a complex system engineering when come to the design and construction of the hydropower station. Due to the diversity of geological conditions, complexity and concealment, consideration incomprehensive in the geological investigation is inevitable, resulting in the situation that the geological conditions do not coincide with the pre-estimation after the riverbed excavation. After discussion,the builders decided to construct a single impervious wall instead of dual impervious wall. As force is applied by soil and water pressure in front of the single impervious wall, the impervious wall is likely to occur to the situation of instability.In order to ensure the overall stability of the structure, it’s necessary to make a reliability analysis for impervious wall in the deep trench construction. In this paper, based on the engineering of the deep groove excavation on the dam foundation of Hydropower station of Longkaikou, by using the finite element method, models were made to analyze the coefficient of supporting stiffness on pebble bed foundation and the interaction between the diaphragm wall and soil. The main work is as follows.1. Make a brief introduction for the basic situation and the deep trench excavation and support methods in deep trench excavation design and construction of Longkaikou Hydropower;2. Summarizes the calculation methods for foundation bed system on pebble bed foundation, including theoretical approaches, experimental methods and empirical methods. Select appropriate units of soil on ravel foundation and the reinforced concrete diaphragm wall, and find a method to determine the boundary conditions. What’s more, the methods to calculate the supporing stiffness coefficient on pebble bed foundation are also summarized. Besides, the finite element software is used to establish the model to analyze the supporting stiffness on the pebble bed foundation bed.3. Considering the various unfavorable factors in the process of construction, several finite element structural models of diaphragm wall are established to analysis the influence of performance of diaphragm wall in excavation by the change of water levels, supporting forms and different supporting stiffness coefficient.4. Summarize the force performance of diaphragm wall in various of working conditions and different forms of supporting conditions, thus providing an economical and reliable construction program for the deep groove excavation in Hydropower station of Longkaikou.