摘要
U型盾构采用移动式盾体进行基坑支护,推进力是设计与应用环节中的重要参数之一。为解决U型盾构推进力的设计问题,以岩土力学和结构力学理论为基础,分析U型盾构在推进过程中推进阻力的产生原因和组成部分,建立U型盾构推进阻力的分项模型,分别对U型盾构推进时的侧部岩土及附加载荷产生的阻力、前部推板的推进阻力、自重摩擦阻力、爬坡阻力、盾尾与管节的摩擦阻力进行理论模型推导,结合地勘及设计参数对各分项阻力进行计算,并对各部分的构成占比进行分析。在实际工程应用中,分别检测统计出2种工况下的总推进力数据,并与理论计算进行比对。结果显示在2种工况下,理论模型的计算数据和实际检测的数据基本相符,表明计算模型的正确性,其分析方法及结果可为类似项目设计提供参考。
U-Shaped shield uses mobile shield to support foundation pit,and propulsion is an important parameter in design and application.In order to solve the design problem of U-shaped shield propulsion,based on the theory of geomechanics and structural mechanics,the causes and components of thrust resistance of U-shaped shield in the process of propulsion are analyzed.The items of thrust resistance of U-shaped shield are established.Based on the model, theoretical model deduction is carried out for the resistance caused by side rock and soil and additional load,the thrust resistance of front push plate,self-weight friction resistance,climbing resistance,friction resistance of shield tail and pipe joints during U-shaped shield driving.The resistance of each component is calculated combined with geological survey and design parameters,and the proportion of each component is analyzed.In practical engineering applications, the total thrust data under two working conditions are tested and counted respectively,and compared with the theoretical calculation.The results show that the calculated data of the theoretical model is basically consistent with the actual measured data under the two working conditions,which verifies the correctness of the calculation model.The analysis method and results provide reference for the design of similar projects.
作者
杨聚辉
王全胜
肖威
YANG Juhui;WANG Quansheng;XIAO Wei(China Railway Engineering Equipment Group Co.,Ltd.,Zhengzhou 450016,Henan,China)
出处
《隧道建设（中英文）》
北大核心
2019年第A01期438-444,共7页
Tunnel Construction
关键词
U型盾构
推进力
主动土压力
被动土压力
移动支护
U-shaped shield
thrust resistance
active earth pressure
passive earth pressure
mobile support
