| The construction of flood control dykes is is a universal urban flood control engineering measure.There are various types of flood control levees used in cities,including earth embankments,stone embankments,sand dikes,concrete vertical retaining wall flood levees,and composite flood levees.The development of new era cities puts forward new requirements and new challenges to the landscape of flood control dikes.In the case of ensuring flood control safety,the city landscape adaptability is maximized.Based on the innovative design of the dike type,this paper proposes a lateral push-pull stealth flood control levee structure.The purpose is to balance the contradiction between the development of flood control dikes and urban development,and provide some reference for the optimization of flood control dike structure and future engineering practice.This article mainly does the following work:(1)Based on the deficiencies of the existing bank type,a new bank type is proposed and designed.Based on the principle of functional satisfaction,ecological adaptability and universal applicability,this paper designs a new bank type consisting of concrete fixed dike section,movable steel gate,upper steel sliding rail and lower concrete sliding rail.The operation mechanism and specific structure size of each part are elaborated,and the methods of using each part in the flood season and non-flood period are explained respectively.The design of the auxiliary structure such as the locking device and the water stop structure is also introduced.In addition,the corresponding operation management scheme and safety monitoring system adapted to the new flood control levee structure are proposed.(2)The static characteristics of the new levees were analyzed.In this paper,the idea of the new embankment type is implemented into a simulation three-dimensional model by using CAD drawing software and ABAQUS finite element software geometric modeling function.The static forces such as dead weight,hydrostatic pressure and uplift pressure are added to the model and calculated.The results show that the deformation and deflection of the new dam type flexural members meet the requirements of the corresponding specifications;the new dam type stress results are good,the stress distribution is uniform under the design and calibration of the stress conditions,the structural stress is reasonable;based on the calculation results of the anti-sliding stability coefficient,it can be seen that the new levee type will not undergo plane sliding or deep sliding.(3)The dynamic characteristics of the new levees were analyzed.The dynamic equation of ABAQUS software was used to solve the structure.On the one hand,dry and wet modal analysis was carried out to obtain the first order natural vibration frequency of dry mode 4.35 Hz and the first order natural vibration frequency of wet mode 3.92 Hz.Given that the frequency of flood wave load is generally less than 1Hz and no resonance damage will occur,the stability of the new dike type under continuous wave dynamic load was verified.On the other hand,seismic dynamic response analysis was carried out to study the stress,displacement and acceleration response of the new embankment under earthquake action.The results show that under the action of seismic dynamics,the displacement and stress of the new bank type meet the strength standard under the dynamic load specified by the code.In view of the problem that the city flood control and urban waterfront landscape is contradictory,this paper designs and develops a new type of hanging steel plate active flood embankment,it can meet the requirements of urban landscape under the condition of ensuring safety of flood control.At the same time this article introduces the structure scheme and operation management plan in detail. |
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