Study On Safety Stability Evaluation And Maintenance Reinforcement Of Stone Arch Aqueduct In Service

In the long-term practice of the stone arch aqueduct in service,due to the influence of natural factors and human factors,the aqueduct has a series of problems such as aging of the concrete of the trough,water leakage and cracks.If these diseases are not dealt with in time,problems of structural damage and performance degradation of the aqueduct may occur,which may affect the structural safety of the aqueduct in severe cases.Therefore,in order to ensure the safe and stable operation of the aqueduct,timely grasp the health status of the aqueduct,it is particularly important to carry out the necessary maintenance and reinforcement.In this paper,taking Xinyugong stone arch aqueduct as the engineering background,the safety and stability assessment of the actual operation state of the whole aqueduct is carried out,and the corresponding maintenance and reinforcement plan of the stone arch aqueduct is given based on the assessment results and various monitoring analyses.The specific work and conclusions of the thesis are as follows:(1)Considering that there are many factors in the evaluation model of the stone arch aqueduct in service,some of these factors are vague.Based on this reason,this paper introduces the relevant theories of fuzzy mathematics and takes into account the intricate complexity of the safety and stability evaluation of the active stone arch aqueduct.Furthermore,regarding the limitations of the current safety evaluation methods of various stone arch aqueducts,it is difficult to ensure the completeness and reliability of the final evaluation results if a fuzzy method is used alone.Therefore,in this paper,two comparisonmodels are selected in the safety and stability evaluation model of stone arch aqueduct.The improved Sugeno fuzzy integral aqueduct safety evaluation model and the AHP-fuzzy comprehensive evaluation aqueduct safety evaluation model were used to evaluate and analyze the in-service stone arch aqueduct,and the feasibility of the two evaluation models was verified.(2)Aiming at the model of safety and stability evaluation based on improved Sugeno fuzzy integral stone arch aqueduct,In the evaluation index system of establishing the aqueduct safety stability model,the "+,?" operation is used to replace the "?,?" operation in the traditional Sugeno integral,which takes into account the indicators with small weight and important functions in the indicator system,making the evaluation system more comprehensive and objective.(3)The article discusses the relevant methods of strengthening the stone arch aqueduct in service,and analyzes and studies each strengthening method and its strengthening theory;Considering that there are many factors that affect the reinforcement of the stone arch aqueduct,and these factors have complexity and uncertainty,a fuzzy comprehensive evaluation method is introduced for the maintenance and reinforcement of the aqueduct.(4)Combining the numerical simulation results of ANSYS finite element software and on-site inspection results,the causes of aqueduct diseases are comprehensively analyzed.This paper finally adopts the fuzzy comprehensive evaluation principle.Taking into account the various factors of certainty and uncertainty of the disease,this paper established a two-level comprehensive evaluation decision model,and obtained the optimal maintenance strategy for the reinforcement of the main arch ring of the aqueduct,That is to add C40 reinforced concrete under the main arch circle.