摘要
Abstract
With the continuous improvement of national infrastructure level,the demand for hydraulic tunnel construction has been increasing year by year,and tunnel construction is facing complex water conditions such as large cross-section,high internal pressure,and variable internal and external loads.The traditional single-layer lining structure is difficult to meet the demand,the stress of hydraulic tunnels is complex,the calculation theory and design methods of lining structures are incomplete,and the accuracy of structural bearing capacity analysis needs to be improved.In response to the mechanical problems of the lining structure of hydraulic tunnels in complex environments,this paper establishes a mechanical model of the joint force of the inner and outer lining,and uses Abaqus software simulation technology to introduce displacement interpolation method to improve simulation accuracy.Firstly,establish a force characteristic analysis model for grouting type prestressed lining,and quantify the influence of prestressed grouting layer on the mechanical characteristics of lining structure;Derive the formula for calculating the internal force of the lining,establish a finite element model in Abaqus and accurately calculate it,and further improve the model accuracy by using displacement interpolation method.The results show that,taking the first phase of the Tao River Water Supply Project in Gansu Province as an example,the maximum bending moment at 1 meter is about 270 kN·m,and it decreases to about 240 kN·m at 3 and 5 meters;The axial force decreases with increasing distance,and the axial stress value at 1 meter is about 260kN,gradually decreasing to near zero;The peak shear force is about 50kN at 3 meters.When the water level rises from 0m to 8m,the maximum increase in bending moment reaches 57%,the maximum increase in axial force reaches 80%,and the maximum increase in shear force reaches 100%.Therefore,the increase in bending moment,axial force,and shear force reflects the significant impact of rising water level and increasing lining thickness on the internal forces of the lining structure of hydraulic tunnels.This method is of great significance for improving the design theory of hydraulic tunnels,guiding engineering practice,and ensuring structural safety and stable operation.关键词
复杂环境/水工隧洞/衬砌结构/承载特性Key words
complex environment/hydraulic tunnel/lining structure/load bearing characteristics分类
建筑与水利
