ABSTRACT
For some specific problem like bearing capacity of ground, analytic method can be used to deduce the solutions of bearing capacities and failure mechanisms. Yamamoto & Kusuda (2001) used upper-bound theorem to calculate the bearing capacities expressing reinforcing effect by the expansion of the failure mechanism. But for dam-foundation system, analytic method is hard for mathematical modelling. Yang et al. (2005a) proposed the Deformation Reinforcement Theory (DRT), studying mechanical behavior which is
1 INTRODUCTION
Chinese history of high arch dam construction has lasted for more than 30 years, during which Ertan arch dam was completed and has been under normal operation so far, in addition, many other 300 m level high arch dams such as Xiaowan, Xiluodu and Laxiwa are also under construction. Due to their unfavorable geological condition of the dam foundation and asymmetry of both sides of abutment, concrete socket is always designed to enhance dam body and adapt to adverse topographical and geological condition of foundation. In order to reduce the load on abutment rock mass and improve state of stress and strain of dam, the concrete socket located in riverbed or abutment is particularly assumed to be applicable, especially where geological condition of lower part of foundation is poorer than the upper part. It is clearly informed that concrete socket is set in international finished dam cases like Vaiont arch dam in Italy and Enguli arch dam in Georgia, and proposed dam case like Jingpin-1 high arch dam and Baihetan arch dam in China.
