摘要
目前,盾构隧道整环足尺试验,其加载模式主要采用荷载控制。液压系统施加在结构上的荷载来源于静止土压力的计算值。这种加载方式采用荷载结构法的思想,难以反映作用在盾构隧道上的土压力随结构变形而改变的特性。针对以上不足,提出荷载位移曲线控制原理并将其应用于盾构隧道整环足尺试验。首先通过数值计算和地勘资料确定地层位移和地层抗力之间的关系,将其输入系统。然后观察此曲线与以液压缸顶力和行程为坐标的点的相对位置,通过调整液压缸顶力使得该点位于曲线上。此控制原理能够实现结构所受荷载随结构位移变化而变化,从而真实地模拟地层对盾构隧道的作用。在盾构隧道足尺试验中具有良好的应用前景。
The full-scale test of shield tunnels mainly adopts load control as load pattern at present.The load applied on the structure by the hydraulic system is derived from the calculated value of the static earth pressure.This loading method adopts the idea of load structure method,and it is difficult to reflect the characteristics of the earth pressure acting on the shield tunnel as the structure deforms.To solve this problem,the principle of a control mode named load-displacement control subsystem is proposed and it has been used in a full-scale test.First obtain the functional relationship between the stratum displacement and the earth pressure.Then observe the relative position of this curve and the point taking the hydraulic cylinder top force and stroke as coordinates,and adjust the jacking force and make it obey the functional relationship.This control subsystem can simulate the characteristic that the load on an underground structure will change when it deform.And there should be good prospective.
作者
朱瑶宏
杨振华
陈飞飞
柳献
ZHU Yaohong;YANG Zhenhua;CHEN Feifei;LIU Xian(Faculty of Architectural,Civil Engineering and Environment,Ningbo University,Ningbo 315211,China;Department of Geotechnical Engineer,Tongji University,Shanghai 200092,China;Ningbo Hoyea Machinery Manufacture Co.,Ltd,Ningbo 315131,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2020年第4期915-923,共9页
Journal of Railway Science and Engineering
基金
国家重点研发资助计划项目(2017YFC0805004)。
关键词
结构试验
加载系统
荷载位移曲线控制
structural experiment
loading system
load-displacement control subsystem
