| Structural characteristics of dam and stability of base are the main contents in the design of gravity dam. As the research objects of this paper, 12#,17#and 19# dam blocks of Wudu RCC gravity dam are the highest non-overflow dam block at the left bank, the highest dam block at the riverbed and the highest non-overflow dam block at the right bank. Because of the weak structural planes in base that are extraordinary developed and interlaced, uneven settlement and stability against deep sliding has become the key technical problems, which restricted the investment and safety. The 3D nonlinear FEM is adopted to systemically research these problems in this paper.1. Dam structural characteristics. Firstly, the distribution regulations of displacement of dam and base around reinforcement are computed and analyzed by 3D non-linear FEM, and compare with that of the homogeneous base and the similar dam. The results show, in the natural base scheme, the horizontal displacement extremum of top of 17# block is about 0.343% of dam height, and that of 19# block is about 0.493% of dam height. After reinforcements, the displacement values decrease and the uneven degree ameliorates apparently. Secondly, the distributed regulations of stress of dam and base are analyzed, and the change of stress distributing at dam heel zone around engineering measures emphatically constrated. The results indicate that there isn't vertical tensile stress in heel zone, and is up to the stress control standard. At last, the work form of nature base and reinforce base is analyzed in order to appraise the work pertinence and validity.2. Stability of base. Firstly, looking for the potential combinations of sliding...
|
PDF Full Text Request