基于小孔扩张理论的顶管施工扰动分析应用
Analysis&Application of Pipe Jacking Construction Disturbance Based on Small Hole Expansion Theory
赵宁 1莫品强 2王博2
作者信息
- 1. 上海城建水务工程有限公司,上海 200082
- 2. 中国矿业大学 深地工程智能建造与健康运维全国重点试验室,江苏 徐州 221116
- 折叠
摘要
针对顶管穿越施工扰动影响问题,依托某污水处理厂顶管下穿箱涵工程,基于岩土介质小孔扩张理论采用MATLAB平台对顶管-土-箱涵相互作用进行编译计算,考虑不同开挖面支撑力和不同顶管埋深,分析顶管施工引起的既有箱涵结构受力和位移变化.结果表明:顶管施工导致的箱涵附加竖向位移及弯矩沿顶管轴线左右对称,箱涵附加应力以顶管轴线为中心向两侧递减;随着顶管埋深和开挖面支撑力的增加,既有箱涵的最大位移、应力以及弯矩逐渐变小.根据顶管埋深,选择合适的开挖面支撑力,可有效降低顶管施工对既有箱涵的施工扰动.同时通过现场实测数据分析,验证顶管穿越地层及构筑物变形的理论分析与现场实测规律的一致性,拓宽小孔扩张理论在顶管工程领域的应用.
Abstract
In view of the disturbance of pipe jacking crossing construction,relying on the pipe jacking underpass box culvert project of a sewage treatment plant,the interaction of pipe jacking soil box culvert is compiled and calculated by using MATLAB platform based on the small hole expansion theory of geotechnical medium,and the changes of stress and displacement of existing box culvert structure caused by pipe jacking construction are analyzed considering different excavation surface support forces and different pipe jacking buried depths.The results show that the additional vertical displacement and bending moment of the box culvert caused by pipe jacking construction are symmetrical along the pipe jacking axis,and the additional stress of the box culvert decreases from the pipe jacking axis to both sides.With the increase of the buried depth of pipe jacking and the support force of the excavation face,the maximum displacement,stress and bending moment of the existing box culvert gradually decrease.According to the buried depth of pipe jacking,selecting the appropriate support force of the excavation face can effectively reduce the construction disturbance of pipe jacking construction to the existing box culvert.At the same time,through the analysis of the field measured data,the consistency between the theoretical analysis of the deformation of pipe jacking through the stratum and structures and the field measured law is verified,and the application of the small hole expansion theory in the field of pipe jacking engineering is widened.
关键词
顶管施工/既有箱涵/小孔扩张理论/施工扰动/开挖面支撑力/监测Key words
pipe jacking construction/existing box culverts/small hole expansion theory/construction disturbance/support force of excavation face/monitoring引用本文复制引用
基金项目
国家自然科学基金面上项目(51874286)
上海城建水务工程有限公司2022年自主立项科技项目(2022320043)
出版年
2024
NETL
NSTL
维普
万方数据