基于路基加固条件下隧道下穿火车站路基沉降分析  

Analysis on Roadbed Settlement of Tunnel-under Crossing Railway Station under the Condition of Roadbed Reinforcement

作　　者：郑明新[1] 高其泽 欧阳林 袁钎 刘家桦[1] 

机构地区：[1]华东交通大学岩土木建筑学院,江西南昌330013 [2]中国建筑西南勘察设计研究院有限公司,四川成都610053

出　　处：《华东交通大学学报》2016年第3期87-93,共7页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(51568022);江西省高等学校科技落地计划项目(KJLD13036)

摘　　要：以福州地铁1号线的上行线下穿福州火车站工程为背景,将现场沉降监测数据和数值模拟结果进行对比分析,研究在旋喷桩加固和袖阀管注浆加固条件下铁路路基沉降变形规律。研究表明：盾构对铁路路基纵向影响范围为盾构刀盘前方10～20 m和刀盘后方40 m,横向影响范围为线路中心两侧20 m范围内;袖阀管注浆区域无论是在盾构施工过程中还是在施工结束后累计沉降变形均比旋喷桩加固区域小,袖阀管注浆加固效果更好;2种加固方式下铁路路基在盾构刀盘离开断面8 d后沉降变形均趋于稳定,路基沉降变形的最终稳定与盾构机离开断面的时间关系密切;数值计算表明,相对未加固而言,2种加固方式都能减小路基沉降,计算结果与监测数据基本相符,可通过数值计算对下行线施工开展路基沉降预测。This study presents the law of roadbed settlement and deformation in railway construction in the case of Fuzhou Metro Line 1 traversing Fuzhou Railway Station. The comparison of on-site monitoring data and numerical stimulation data was made in the study to analyze the settlement and deformation law under the condition of the jet grouting pile and the sleeve valve tube grouting reinforcement.The analysis indicates that longitudinal effect of shield on roadbed ranging from 10 m to 20 m in the front of the cutter head and 40 m behind the cutter head; and the horizontal effect range is 20 m from central line on both sides. The plastic valve pipe grouting area of plastic valve pipe grouting is comparatively smaller than jet grouting area whether in the process of shield tunnel construction or after the construction, thus the construction effect of plastic valve pipe grouting is better.For two reinforcements, the railway roadbed tends to be stable after 8 days when the shield cutter head left the cross section, and the stability and the settlement of the roadbed are directly related to the time of settlement deformation; Numerical stimulation shows that the embankment settlement could be reduced by both of reinforcements, and numerical stimulation statistics is in conformity with measured data and the sleeve valve tube grouting reinforcement effect is better.

关 键 词：盾构隧道 路基沉降 旋喷桩 袖阀管注浆 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程] TU941[交通运输工程—道路与铁道工程]