Study On Structural Stochastic Finite Element Analysis Of Slag Dam Based On Spectral Representation

With the deepening of the "One Road,One Belt" construction,various engineering constructions have shown a large and fast development trend.The development and construction of large-scale hydropower,intercity railways,highways,oil transportation,natural gas transmission and other projects,urban development and other project development are increasing.However,in the construction of the project,the original landform is often changed to a certain extent,resulting in a large amount of spoil and spoil.These loose waste slag materials form a waste slag dam after landfilling.Spoil dam is a special dam type between natural formation and manual control.Spoil dam has structural features such as unsaturated,porous,underconsolidation.Under the influence of rainfall,earthquakes and other external loads,it is very likely that landslides,collapses and other unstable behaviors will occur,threatening the lives and property safety of the people and possibly causing serious ecological and environmental disasters.Therefore,the reliability analysis of the structural safety behavior of the Spoil dam to avoid the occurrence of disasters or accidents of the abandoned slag dam is an urgent problem that needs to be solved at present,and it is of great significance to carry out corresponding research.This paper uses the theory of random field to develop a non-invasive finite element analysis method,and proposes a non-invasive random finite element method based on the spectral representation method to study the influence of the spatial variability of slag parameters on structural safety,and provide a reference for the design and construction of the slag dam.The main research contents and results are as follows:(1)Under the framework of MSC.Marc software,using its subprogram interface,with the help of Fortran language,the non-invasive finite element of the slag dam E-B constitutive model was compiled.Combined with engineering examples,the rationality and effectiveness of model development were verified,which laid the foundation for the subsequent development of non-invasive random finite elements.(2)Combining Morris method and Sobol method to analyze the parameter sensitivity of E-B model of the spoil dam.Use the Morris method to obtain the parameters that have a greater impact on the output of the model at a lower computational cost.Then reorder the parameters obtained by Morris method using Sobol method.Give quantitative analysis results of parameter sensitivity levels,Not only the calculation efficiency is improved,but also the reliability of the parameter sensitivity analysis is improved(3)Random field discretization using spectral representation method to simulate the randomness of material parameters of the spoil dam.Combined with the non-invasive FEM developed based on MSC.Marc,the deterministic finite element analysis and the random analysis process are performed separately and independently.The non-intrusive non-intrusive spectral random finite element method,which improves the reliability of the calculation results Combined with an example,the influence of the spatial variability of the material parameters of different parts of the spoil dam on the stress and strain of the dam body is calculated and analyzed,and the influence law of the parameter variation on the settlement and deformation of the dam body is explored(4)Random field discretization using spectral representation method to simulate the randomness of material parameters of the spoil dam.And developed the Geostudio software interface to realize the non-intrusive spectrum stochastic finite element method for dam slope stability.The LHS-NSSFEM method was used to calculate the probability and reliability of dam slope sliding failure,and to explore the effect of randomness of parameters on structural safety behavior.(5)In order to better apply the theoretical research to the practical engineering field,this chapter combined with the calculation model and program established above.based on the B/S architecture,built the safety performance evaluation software platform of the spoil dam,which provided new ideas,new technologies and new platforms for the information management,structural safety performance analysis and safety evaluation of the spoil dam.