Dynamic And Static Finite Element Analysis Of Sanhekou RCC Arch Dam

Roller compacted concrete arch dam is more and more used in water conservancy projects because of its advantages such as good overload capacity,high safety and stability coefficient,significant operation effect,and investment saving.Because the height of arch dam itself is generally high and its shape is space shell structure,the design of arch dam is difficult.Therefore,in order to make the dam design more reasonable,operation more safe and project cost more economic,it is necessary to optimize the shape of the arch dam,as well as calculate and analyze the stress of the dam body and the stability of the dam abutment with three-dimensional finite element method.Based on Sanhekou RCC arch dam,this paper proposes several load combination schemes and carries out simulation analysis and calculation research respectively.Through the analysis of the results,the safety and stability of arch dam shape and stress are evaluated.The results show that:(1)Temperature has a great influence on the stress distribution of arch dam.When the temperature decreases,the dam body will deform to the downstream;when the temperature increases,the dam body will deform and expand to the upstream.The change of temperature makes the main tensile stress of some parts of the dam body increase,and the main compressive stress of some parts increase.(2)Under the basic load combination condition,the maximum value of the main tensile stress of the dam body is 1.5MPa according to the finite element equivalent stress,which is not greater than the pull-down stress control standard of 1.5MPa under the combination condition;the maximum value of the main compressive stress of the equivalent dam body is 6.2MPa,which is less than the pressure stress control standard of 6.25MPa under the combination condition.(3)Under the non seismic special load combination condition,the maximum value of the main tensile stress of the dam body is 1.8MPa,which is less than the pull-down stress control standard of the combination condition of 2.0MPa;the maximum value of the main compressive stress of the equivalent dam body is 6.5MPa,which is less than the pressure stress control standard of 7.14MPa under the combination condition(4)The maximum value of the main tensile stress of the dam is 2.2MPa,which is less than the pull-down stress control standard of 3.08mpa under the combined working condition;the maximum value of the main compressive stress of the equivalent dam is 6.9MPa,which is far less than the control standard of 16.39MPa under the combination condition(5)The maximum value of the main tensile stress of the selected RCC parabolic arch dam in the basic load combination condition is 1.5MPa,which is not greater than the pull-down stress control standard of 1.5MPa in the combination condition,and the maximum value of the equivalent dam main compressive stress is 6.2MPa,which is close to the control standard of 6.25MPa in the combination condition.The maximum values of the main tensile stress and the main compressive stress under the special load combination condition are less than the corresponding stress control standard(6)The calculation and analysis of plane layered stability show that the safety factor of anti sliding stability of left and right abutment rock mass horizontal fracture surface and dam foundation rock mass horizontal fracture surface at all elevations is greater than the minimum safety factor specified in the code,which meets the requirements of the codeThe results show that the stress distribution of the dam body is relatively uniform,the dam body is safe and applicable,quality assurance,economic and reasonable,and advanced technology.The research results can not only provide reference for the safety and stability assessment of Sanhekou RCC arch dam,but also provide reference for the dynamic and static analysis of similar projects.