|
Abstract With the three-dimensional nonlinear finite element analysis and geomechanical model of rupture test，focusing on analysis of the results of no crack working condition and crack after treatment working condition，the influences on Xiaowan arch dam stress distribution and global stability are studied as well as the possibility of crack propagation. The result indicates that the dam stress distributions of two working conditions are almost the same and the influences of crack are negligible. Under the normal water load，nearly all cracks are in the pressure- shear condition；and the tensile stress is small or does not exist，so the crack will not expand. After the dam overload test，the nonlinear load between 3.2P0 and 3.3P0(P0 is normal water load) after the crack is dealt with，which is quite close to 3.5P0 in the no crack working condition；limited parts of the dam cracks become large-crack area after overloading 3.0P0，but the influences of crack will not reach the crack area until overloading 5.0P0. The dam cracking limit state is similar to that of no crack working condition，but large difference of global stability between the two working conditions is found.
|
|
Received: 25 February 2010
|
|
|
|
