Abstract
Abstract Geological conditions play a decisive role in the stability of arch dam engineering, and the asymmetric geological conditions of the abutment have a very negative impact on the safety of the arch dam. This article takes Lizhou arch dam as the research object, and determines that the arch dam is preliminarily affected by the geological asymmetric characteristics. Through the geomechanical model test method, the overload failure test of the Lizhou arch dam was carried out, and the resistance body, the instability deformation of the structural plane of the two dam abutments, and the influence of each structural plane on the dam body are obtained, and the safety factor is determined. According to the test results under the condition of asymmetric foundation of arch dam, for the structural plane which affects the geological asymmetry of the arch dam, the corresponding reinforcement measures are carried out. The feasibility of the reinforcement scheme is verified by the finite element method, and the safety factor after reinforcement is obtained. According to the results, it is suggested that some engineering measures can be taken to reduce the geological asymmetry between the two banks and ensure the safe and stable operation of the arch dam in the future.
Highlights
Geological conditions play a decisive role in the stability of arch dam engineering, and the asymmetric geological conditions of the abutment have a very negative impact on the safety of the arch dam
The overall stability and safety of the Lizhou arch dam and its foundation are demonstrated through the geomechanical model test method
The influence of the instability deformation of the structural surface on the dam abutment resistance body can be assessed by the displacement of the left and right dam abutments along the river, the measuring points on the surface of the resistance body, and the failure of dam abutment rock mass
Summary
Abstract: Geological conditions play a decisive role in the stability of arch dam engineering, and the asymmetric geological conditions of the abutment have a very negative impact on the safety of the arch dam. Through the geomechanical model test method, the overload failure test of the Lizhou arch dam was carried out, and the resistance body, the instability deformation of the structural plane of the two dam abutments, and the influence of each structural plane on the dam body are obtained, and the safety factor is determined. In some arch dam projects, for example, Yebatan arch dam and Dagangshan arch dam [1,2,3,4,5], the abutments on both banks are asymmetric, which has an adverse effect on the safety and stability of the arch dam This type of defect may cause the tensile stress on the downstream surface to be distributed along an oblique axis, and the compressive stress is skewed and asymmetric, resulting in reduced load carrying capacity. The geological characteristics of the Lizhou arch dam were thoroughly analyzed using geomechanical model testing, and the influence of the asymmetric geological conditions on the safety and stability of the dam were investigated
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