摘要
小曲线半径叠落盾构隧道近接施工风险较高,其安全控制是工程界亟待解决的难题。依托某叠落盾构工程,通过数值模拟,研究了夹层土注浆、架设内部钢支撑等措施的可行性,据此提出合理的控制方案,并结合现场监测数据对安全控制效果进行评价。研究结果表明:相比于无加固措施方案,夹层土注浆加固能够提高夹层土的强度,有效减小管片上浮,架设内部钢支撑能减小管片水平变形,两种方案结合能够有效保持断面形状;管片拱顶竖向变形和水平净空收敛变形的最大值分别为7.02 mm和2.74 mm,均小于变形控制标准值;现场采用夹层土注浆和架设内部钢支撑的联合措施是合理和可行的。
The risk of the adjacent construction of overlapped shield tunnel with a small radius of curve is relatively high,so its safety control is of great importance in the industry.Based on the case of an overlapped shield tunnel project,the feasibility of control measures such as interlayer soil grouting,erection of internal steel supports,etc.was studied through numerical simulation,and a reasonable control scheme was proposed accordingly.In addition,the effect of safety control was evaluated according to the data of on-site monitoring.The study results showed that,compared with the scheme without reinforcement measures,the reinforcement through interlayer soil grouting could increase the strength of interlayer soil and effectively reduce the floating of segments,while the erection of internal steel supports were could reduce the horizontal deformation of segments.The combination of these two schemes could effectively maintain the shape of the section,and the maximum values of vertical deformation of segment crown and convergence deformation of horizontal clearance were 7.02 mm and 2.74 mm respectively,both of which were less than the standard value of deformation control.Therefore,the combined use of interlayer soil grouting and erection of internal steel supports on site was reasonable and feasible.
作者
张丽丽
单琳
郭飞
蔡振
韩瑞林
张旭
王智广
许有俊
ZHANG Lili;SHAN Lin;GUO Fei;CAI Zhen;HAN Ruilin;ZHANG Xu;WANG Zhiguang;XU Youjun(Beijing Municipal Construction Group Co.,Ltd.,Beijing 100048;School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010;Academicians and Experts Workstation of Mine Safety and Underground Engineering,Inner Mongolia University of Science and Technology,Baotou 014010;Technical Research Center for Urban Underground Engineering of Colleges and Universities in the Inner Mongolia Autonomous Region,Baotou 014010)
出处
《现代隧道技术》
CSCD
北大核心
2022年第3期254-264,共11页
Modern Tunnelling Technology
基金
国家自然科学基金(52168059)
内蒙古自治区自然科学基金(2020BS05031).
关键词
叠落盾构隧道
小曲线半径
近接施工
安全控制
夹层土注浆
型钢支撑
Overlapped shield tunnel
Small radius of curve
Adjacent construction
Safety control
Grouting in interlayer soil
Profile steel support