An Analysis of Deformation and Control Factors of Baihetan Abutment Slope during the Construction Period.

Baihetan Dam Site is characterized by complex geological and structural conditions. The unloading effect of rock mass is strong and the number of faults, dislocation zones, deep fractures and other weak structural planes develops there . During the construction period, human activities have seriously damaged the stability of the high and steep slope, and affect the long-term safe and stable operation of the dam. Combined with the geological materials, this paper analyzes the monitoring data of the abutment slope during the construction period and studies the law of the slope deformation in different elevations of the abutment on both banks. Based on geological data, a three-dimensional finite element model of slope is built, and numerical simulation is carried out by FLAC3D software during slope excavation and support. The rationality of the numerical simulation results is verified by monitor data, and then the dam deformation law of the high and steep slope on both sides is studied according to the results of numerical simulation and in combination with monitoring data. The results show that both sides of the abutment slope is stable during the construction period. [ABSTRACT FROM AUTHOR]