Random Evolution Law and Reliability Analysis of Mechanical Properties of Frozen Wellbore Concrete Structure
ZHU Yujia
Abstract：The mechanical properties of the concrete structure of a certain wellbore were investigated,and the stochastic finite element method was employed to perform reliability analysis on the mechanical parameters of the frozen wellbore concrete structure.The results indicate that:(1)The optimal correlation function form is Gaussian(3-DSQX),with the standard deviation of deformation of frozen wellbore concrete decreasing as the autocorrelation distance(ACD)increases,and increasing as the coefficient of variation(COV)increases;(2)Under the randomness of elastic modulus,Poisson's ratio,cohesion,and internal friction angle,the most probable failure depths of the frozen wellbore are 500 m,300 m,400 m,and 600 m respectively,with corresponding maximum failure probabilities of 5.55％,4.99％,4.76％,and 4.01％;(3)Enhancing mixing uniformity,reducing random fluctuation of elastic modulus,and lowering its coefficient of variation can effectively improve the reliability of the wellbore.
Keywords：frozen wellboreconcrete structuremechanical parametersreliability
Publication Date：2025-07-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 70-77,95 )