Evaluation of Overall Stability of Extra-high Arch Dam by Plastic Yield Volume Strain Increment Product
As an important basis for evaluating the overall stability of arch dam,the work behavior of the abutment rock mass is the key and difficulty of the design and safety control of the extra-high arch dam.In numerical simulation a-nalysis,the traditional evaluation method based on the development range of tensile and compressive shear yield regions cannot consider the degree of damage yield of rock mass and structural planes,and it is difficult to accurately evaluate the working behavior of stress sensitive materials such as faults.In this paper,an evaluation method for the overall stability of arch dam was proposed,which is based on the strain increment to judge the work behavior of structural plane in dam a-butment after construction and impoundment,and the evaluation index was the product of the volume of the plastic ele-ments and their strain increment.The method was used to study the ZY extra-high arch dam,revealing the evolution law of the overall stability characteristics of the rock mass and the structural plane under normal working conditions and over-load conditions,clarifying the faults that significantly affect the stability of the dam abutment,which provides technical support for the overall stability evaluation of the super-high arch dam and the optimization and control of the reinforce-ment measures.
万方数据
维普
