路基工程Issue(2)：148-155,8.DOI:10.13379/j.issn.1003-8825.202403072
土洞影响下桥梁桩基承载特性及参数敏感性研究
Study on Bearing Behavior and Parameter Sensitivity of Bridge Pile Foundation under the Influence of Soil Cave
摘要
Abstract
In the section from Weifang to Qingdao of Jinan—Qingdao Highway and at the Pile ZK45 of Weihe Grand Bridge on the connecting line,the field tests were carried out and,with the model of pile foundation-soil cave-rock soil mass established,the sensitivity of the pile foundation's bearing behavior to the parameters of the soil cave was analyzed.The result shows that,as the ratio of soil cave height to pile length(height length ratio)and the soil cave span increase,the bearing behavior of pile foundation decreases with the deceleration gradually increases or decreases,respectively and,when the height length ratio and the cave span increase by 0.16 m and 6 m respectively,the bearing capacity respectively decreases by 14.95％and 6.75％;as the buried depth of soil cave gradually increases to 8 m,the bearing capacity of pile foundation decreases by 8.30％;in the scope of the soil cave,the axial force of pile does not change and the pile side resistance almost does not come into play,moreover,with the increase of the cave height,the scope where the pile side resistance does not comes into play will expand;the rate of side resistance increases first and then decreases with the increase of the cave height and buried depth,or decreases first and then increases with the increase of the cave span;the order of the sensitivity of pile foundation's bearing behavior to soil cave height,cave span and buried depth is as follow:soil cave height＞soil cave buried depth＞soil cave span.关键词
桥梁工程/桩基/土洞/承载特性/数值仿真/敏感性Key words
bridge engineering/pile foundation/soil cave/bearing behavior/numerical simulation/sensitivity分类
建筑与水利引用本文复制引用
李强,郑志明,董磊,庄培芝..土洞影响下桥梁桩基承载特性及参数敏感性研究[J].路基工程,2025,(2):148-155,8.基金项目
山东省青年基金项目(ZR2021QE186) （ZR2021QE186）
