地铁隧道穿越块碎石土填方地带施工对策研究  

The study of construction countermeasures about subway tunnel passes through high fill geological area of crushed rock soil

作　　者：董倩[1,2] 赵宝云[1] 孔凡林[2] 

机构地区：[1]重庆科技学院建筑工程学院,重庆401331 [2]重庆市建筑科学研究院,重庆400020

出　　处：《四川建筑科学研究》2013年第4期165-169,共5页Sichuan Building Science

基　　金：重庆市自然科学基金项目(CSTC;2010BB0333);重庆市建设科技计划项目(城科字2011第12号)

摘　　要：隧道开挖穿越块、碎石土填方地带是山地城市地铁隧道施工的一大技术难题,其中控制地表沉降和变形、减小对既有建筑物的影响意义重大。以重庆地铁三号线一段复杂地质段隧道开挖为例,针对开挖过程中出现地表路面沉降过大、构筑物开裂等问题,结合监测结果进行分析,在有限元分析计算的基础上,提出超前小导管注浆加固、中壁法施工以及控制开挖速度、及时支护等技术措施,确保围岩稳定、控制地表沉降和变形。采用改进技术措施后的监测结果显示,拱顶下沉和收敛值显著减小,地表沉降得到有效控制。说明改进后的施工技术措施达到了有效控制沉降、变形的目的。本文的施工方案研究可为类似工程提供参考。This is an important technical problem that subway tunnel excavation pass through a filled area of crushed rock soil in mountainous city, and to control the ground surface settlement and reduce the influence for existing building have great significance. The paper presents an example that tunnel excavation pass through complex geological area of metro line no. 3 project in Chongqing. At first, according to the monitoring results ,the big surface subsidence and structures cracking appear in the process of the tunnel excavation are discussed. And then,use the finite element method analysis and calculation. On the basis of the analysis and calculation results,many effective technical measures are proposed to ensure stability of sun＇ounding rock and control the ground surf ace settlement. Such as small catheter grouting consolidation, CD construction method,excavation speed control and so on. The monitoring results show that the vault sinks and convergence value reduce significantly after the improved technology measures are used. At same time, the ground surface settlement is controlled effec-tively. The results show that the improved construction measures achieve the purpose to control the settlement and deformation. The study result of construction scheme can provide reference for the similar project.

关 键 词：浅埋隧道 地表沉降 块、碎石土 高填方 施工对策 

分 类 号：U455[建筑科学—桥梁与隧道工程]