微型顶管钢制井筒内力理论解及其壁厚研究  

Research on theoretical solution of internal forces and wall thickness of micro pipe jacking steel shaft

作　　者：陈凯 Chen Kai(Shanghai Urban Construction Design and Research Institute(Group)Co.,Ltd.,Shanghai 200125,China)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《山西建筑》2025年第3期67-72,共6页Shanxi Architecture

摘　　要：针对微型顶管应用面逐步扩大的背景及趋势,为实现钢筒量化设计及科学施工,研究钢筒受力的理论解。钢制井筒所受外力拆解为顶进时的土反力及主动土压力两部分,分析数值模拟所得土反力大小及分布规律,借鉴钢筋混凝土沉井经验归纳出钢筒内力理论解答,进而讨论钢筒壁厚的影响因素。结果表明,钢筒所受土反力水平向按余弦函数分布,竖向按指数分布,分布状态均与所处地层特性相关;钢筒所需壁厚与顶力大小、钢筒内径、管道埋深正相关,与土体m值反相关;可通过加固后靠背土体或采用触变泥浆减小顶力等方法控制钢筒壁厚在合理范围内。This article focuses on the background and trend of the increasing application of micro pipe jacking,in order to achieve quantitative design and scientific construction of steel shaft,and to study the theoretical solution of internal forces in steel shaft.The external force acting on the steel shaft is decomposed into two parts:the soil reaction force during jack-ing and the active earth pressure.The magnitude and distribution of the soil reaction force obtained from numerical simula-tion are analyzed.Drawing on the experience of reinforced concrete caisson,the theoretical solution for the internal force of the steel shaft is summarized,and the influencing factors of the steel shaft wall thickness are discussed.The results show that the soil reaction force acting on the steel shaft is distributed horizontally according to a cosine function and verti-cally according to an exponential distribution,and the distribution state is related to the characteristics of the geological layer in which it is located;The required wall thickness of the steel shaft is positively correlated with the jacking force,in-ner diameter of the steel shaft,and burial depth,and negatively correlated with the m value of soil;The wall thickness of the steel shaft can be controlled within a reasonable range by reinforcing the backrest soil or using thixotropic mud to re-duce the jacking force.

关 键 词：钢制井筒 壁厚 理论解 土反力 基床系数 

分 类 号：TU311.4[建筑科学—结构工程]