Feasibility Study Of MgO Concrete As Temperature Control Measures For Linxi River Arch Dam

The arch dam from the top o to the ground base is constrained by the bedrock on both sides of the dam,and the uniform volume deformation will cause the stress of the dam,and the shrinkage caused by the temperature drop during the construction period will easily cause the crack of the dam,which affects the arch action of the dam,and will seriously affect the operation life of the dam,so the delayed micro expansion technology of the MgO concrete is better compensated for the coagulation.The tensile stress produced by the temperature drop during the construction process and the MgO concrete arch dam can greatly simplify the temperature control measures and effectively solve the problem of crack prevention of concrete temperature control.However,the effect of MgO stress compensation is closely related to the material selection,construction technology and local weather.Therefore,the stress field simulation of the concrete project needs to be simulated in the construction period.To ensure that the stress is met.In view of the actual engineering Linxi River dam,the three-dimensional model grid of the rach is divided by Abaqus pretreatment.According to the actual engineering data and the concrete experiment report,the material parameters of the stress field in the construction period of the dam are properly fitted,and the construction process of the dam is described accurately,and the autogenous volume deformation of the MgO coagulant soil varies with the age of the age.The model is introduced in detail to prepare for accurately simulating the temperature field stress field during dam construction period.Under the consideration of water storage and water storage,the effect of different MgO content on the stress field during the construction period of the dam is compared and analyzed.The effect of MgO spontaneous volume expansion on the stress compensation of the dam is studied.The results show that the effect of MgO concrete on the stress field in the construction period of the dam is obvious,and the amount of MgO admixture can be appropriately increased within a fixed range.The maximum stress of the dam is effectively reduced.The 5%MgO concrete basically meets the needs of the stress field during the construction period of the dam,and the maximum stress compensation for the dam body can reach 0.7Mpa,and the volume expansion of the dam body’s autogenous volume is within the range of 60x10^-6 to 100x10^-6.According to the calculation results and considering the actual construction process,the adjustment calculation of the scheme shows that 5%MgO is used in the basic confinement area and the height of the dam height 25m to 50m,while the other parts are4%MgO,the stress of the dam can be guaranteed to meet the stress requirements;because the expansion of MgO is not very large and the amplitude of the compensation stress is small,the high temperature season is avoided.During construction,5%MgO can basically meet the requirements of stress and does not require additional temperature control measures.In addition,appropriately increasing MgO expansion is beneficial to dam body stress compensation.The maximum stress compensation for the dam can reach 0.7Mpa,and the volume expansion of the dam body is within the range of 60x10^-6 to 100x10^-6.