水利水电技术2017，Vol.48Issue(6)：18-22,5.DOI:10.13928/j.cnki.wrahe.2017.06.004
埋藏式钢岔管与外围结构的联合作用分析
Analysis on combined action of embedded steel bifurcated penstock and its surrounding structure
摘要
Abstract
In order to understand the mechanical mechanism of the combined-bearing of the embedded steel bifurcated penstock and its surrounding structure,an elaborate mechanical simulation is made on the combined action with 3-D finite element method,for which a new kind of model is tried,i.e.setting backfill concrete mesh,simulating two gaps in between steel bifurcated penstock,concrete and surrounding rock and their mechanical contact behaviors and considering the plastic deformation characters after the bearing of concrete.The study shows that the process of the interaction between the bifurcated penstock and its surrounding structure is spatially complicated.Due to the combined bearing of both the bifurcated penstock and its surrounding structure,the strength of the steel is fully exerted,while the backfill concrete does not uniformly crack along the radial direction,thus this assumption-based model is necessary to be further deliberated.Moreover,full attention must be paid on the deformation of the backfill concrete,for which the compressive deformations at some locations are even larger than the initial widths of the gaps in between the structures,and then unfavorable to the combine bearing.The sharing rate of the surrounding rock for the internal water pressure obtained from the mode with two gaps is obviously lower than that from the mode of one gap,thus the sharing rate of the surrounding rock is possibly overestimated by the latter.A new mode for the stress analysis on the embedded bifurcated penstock is given herein.关键词
岔管/联合作用/材料非线性/接触Key words
bifurcated penstock/combined action/material nonlinearity/contact分类
建筑与水利引用本文复制引用
崔炜,朱银邦,赵贤学,张国新,韩守都..埋藏式钢岔管与外围结构的联合作用分析[J].水利水电技术,2017,48(6):18-22,5.基金项目
国家自然科学基金项目(51579252) （51579252）
中国水科院科研专项(材基本科研KY1612) （材基本科研KY1612）
