摘要
依托实际工程,分析黄土地区涵洞接长施工技术难点,确定弱扰动涵洞防护方案,优化涵洞接长结构和过渡段填筑施工方案,基于各阶段监测数据,探究涵洞接长方案对既有线的影响。结果表明:弱扰动涵洞防护方案实施时对既有线影响较小,且在钢板桩施工阶段对既有线影响最大(<0.5 mm);涵洞接长结构(横向)和过渡段填筑(纵向和横向)采用对称施工,可有效降低既有线两侧变形值的差异对既有线轨道水平值的影响;涵洞上侧位置变形随复合地基施工波动,且整体呈上升趋势,而过渡段位置变形先增加后降低,且涵洞上侧位置变形大于过渡段位置;各侧物位计变形随本侧底板、侧板、顶板和八字墙浇筑阶段均发生突降变形;各工点物位计沉降值均随过渡段填筑高度的增加呈非线性增加,且各填筑阶段过渡段位置沉降变化值均高于涵洞上侧。
Based on the monitoring data of each stage in the construction project,this paper analyzes the technical difficulties in culvert extension in loess areas,determines the protection scheme for weakly disturbed culverts,optimizes the method statement of culvert extension structure and transition section filling,and explores the impact of the culvert extension scheme on the existing line.The results show that:The implementation of weakly disturbed culvert protection scheme has little impact on the existing line,yet has rather large impact on the existing line during the construction stage of steel sheet piles(<0.5 mm);by symmetrically constructing the culvert extension structure(transverse)and transition section filling(longitudinal and transverse),the impact of the difference in deformation values on both sides of the existing line on the track level value of the existing line can be effectively reduced;the deformation at the upper side of the culvert fluctuates with the construction of the composite foundation and shows an overall upward trend,while the deformation at the transition section increases first and then decreases,and the deformation at the upper side of the culvert is greater than that at the transition section;the deformation of the level gauge on each side suddenly drops and deforms with the pouring stage of the bottom plate,side plate,top plate and wing wall on this side;the settlement value of the level gauge at each construction site increases nonlinearly with the increase of the filling height of the transition section,and the settlement change value at the transition section position in each filling stage is higher than that on the upper side of the culvert.
作者
柴亮
CHAI Liang(Lanzhou Construction Headquarter,China Railway Lanzhou Group Co.,Ltd.,Lanzhou Gansu 730031,China)
出处
《铁路技术创新》
2022年第5期53-60,共8页
Railway Technical Innovation
关键词
黄土地区
涵洞接长
既有线
弱扰动涵洞
减控措施
loess area
culvert extension
existing line
weakly disturbed culvert
mitigation and control measures
