Experimental Study on the Stability and Damage of Lizhou Arch Dam Abutment
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Abstract:
Lizhou hydropower station is an important cascade hydropower station located in the Muli River. The project adopts a roller compacted concrete (RCC) arch dam, and the maximum height of the dam is 132 m. The geological conditions in the dam area are very complex, therefore, the overload method of three-dimensional geo-mechanical model test was used to characterize the effects of the complex geological structures such as the faults, interbedded shear zone, large fissure, and fissure zone on the overall stability of dam and foundation. The optical fiber grating sensor was placed at the dam top and upstream dam surface to monitor the deformation of the dam under the overloading process, which can be used to analyze cracking destruction process of the arch dam. Through experimental study, the distribution characteristics of displacement of the dam abutment were identified, the overloading safety factors of dam and foundation were determined, and the failure modes of dam abutment were obtained. The results could provide scientific basis for Eengineering design and construction.
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