钻孔灌注桩加固砂质斜坡路堑设计参数影响研究  

Study on Influence of Design Parameters of Sandy Slope Cutting Strengthened by Bored Piles

作　　者：赵鑫辉 黄德贵 刘乙甫 ZHAO Xinhui;HUANG Degui;LIU Yifu(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High-speed Railway Engineering(Southwest Jiaotong University)of Ministry of Education,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《路基工程》2023年第5期94-100,共7页Subgrade Engineering

基　　金：国家自然科学基金资助项目(5187081943);四川省科技计划项目(2021YFH0024)。

摘　　要：为弄清钻孔灌注桩加固砂质斜坡路堑桩板结构受力及变形特性,以西部山区风积沙地貌某铁路采用钻孔灌注桩和植筋挡土板加固斜坡路堑工点为例,基于现场监测、理论计算和数值分析,以9组桩间距和4组桩径为变量,分析结构受力及变形特性。研究发现:在不同桩间距和桩径下,得出钻孔灌注桩沿桩身弯矩、剪力、挠曲线和桩板连接钢筋轴力的变化规律,稍密细砂和中密细砂分层处桩身需加强,中部连接钢筋需加强;桩径为0.5 m或桩间距达4倍桩径时均无法起到良好支护作用。In order to understand the stress and deformation characteristics of pile plate structure reinforced by bored pile in sandy slope cutting,taking the railway work site with an aeolian sand landform and of a slope cutting strengthened by bored piles and reinforced retaining planks located in the western mountainous area of China as an example,the load and deformation characteristics of the structure are analyzed based on field monitoring,theoretical calculation and numerical analysis with 9 groups of pile spacing and 4 groups of pile diameter as variables.Through the analysis,under different pile spacings and diameters,the variation law of the bending moment,the shear force and the deflection curve along the pile body as well as the axial force of the steel bar connecting the pile and the plank is obtained and the results show that the pile body at the boundary of slightly and moderately dense fine sand and the connecting steel bar at the middle need to be strengthened and when the pile diameter is 0.5 m or the pile spacing is 4 times the pile diameter,sound supporting effect cannot be achieved.

关 键 词：风积沙 斜坡路堑 钻孔灌注桩 现场监测 数值分析 桩间距 桩径 

分 类 号：TU473.14[建筑科学—结构工程]