| Hydraulic Structure Engineering, Department of Hydraulic Engineering Sichuan UniversityIn the strategy to develop western regions, the development of hydraulic energy is an important and arduous task. According to the national planning, the emphasis of development in the near future is to build a set of skeleton and large-scale hydroelectric power station in the midstream and upstream of rivers in the southwest and northwest. It will meet the needs of western economic construction and carrying electricity from the west to the east. Because these stream segments are mostly in high mountain and barranca, their topography is precipitous and geological condition is complicated and the project scale is majesty. There should build a batch of high dams to form heavy reservoir, heavy hydropower stations and the important energy base of the country.With the planning and construction of these projects, more and more high dams will be built on the ground with complicated geological structure. In order to guarantee to build up smoothly and operate the project safely, the whole stability and security of the high dam and ground must be solved well. Numeric analysis and physical model are two effective methods to solve the above-mentioned problem. Currently a lot of domestic and international great projects adopt the method combined experimental study with computational analysis. The two methods display each advantage and verify and remedy each other. Thus the great technological problem of the project is demonstrated fully. To model test, the geomechanical model test has made great progress in model material, simulation technique and test means. Especially when the mutative temperature similar material has been researched successfully, it makes the means of strength reserve become true. A lot of materials of geomechanical model in recent years have been consulted in this text. The method of model test has been summarized. And three-dimensional geomechanics breakage model test is adopted to study the stability of dam shoulder and foundation of Jinping â… hydro-power station combining its characteristic of topography and geologic and the distribution states of fault and crack which play a controlling role to the stability. The experiment catches the principal contradiction which influences the stability of dam. According to the parameters of rock mass mechanics and structural surface, the mutative temperature similar materials which are fit for the geological conditions of Jinping â… hydro-power station are developed, further more, overload and strength reserve are jointly used. From the test, several conclusion are made as follows: (1) the synthetic buckling safety factor of dam shoulder and foundation of Jinping â… hydro-power station are determined as 4.68-4.94 and the security of the engineering is evaluated; (2) the destruction process, destruction condition and the failure mechanism of dam shoulder and foundation are analyzed and the weakness of the project is concluded. Thus suggestions of reinforcing treatment are proposed; (3) the distribution of displacement and its changing character of two dam shoulders are concluded and the distortion of the dam shoulder and foundation is realized; (4) the distribution of relative displacement and its changing character of the fault and alteration are concluded and distortion of the main geological structure is realized; (5) the distribution of displacement and strain and their changing characters of the dam body are achieved.Important gists are given to the design and construction by the test.This text also probes into the influence to the test which is created by the earthquake. The non-linear structure analysis is based on America finite element general soft ware ANSYS and then corresponding appraisal has been made. From the analysis, the degree of impact on model test by the earthquake is about 23.8% to the deflection and about 24.0% to the first principal stress and about 23.3% to the third principal stress. |
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