原位2扩4隧道CD工法开挖的空间效应研究  

Study on Excavation Space Effect of CD Construction Method Applied to Tunnel Expanded from Two-Lanes to Four-Lanes

作　　者：舒忠磊 林从谋[1] 常方强[1] 

机构地区：[1]华侨大学岩土工程研究所,福建厦门361021

出　　处：《建井技术》2017年第5期35-38,50,共5页Mine Construction Technology

基　　金：福建省自然科学基金计划资助项目(2014J01197);国家自然科学青年基金资助项目(41306051)

摘　　要：基于大帽山原位扩挖隧道现场监测数据,对扩挖隧道工作面空间约束与掘进距离的关系作了探讨,并将所得拟合曲线同3类LDC曲线作对比,分析了相邻导坑对扩挖隧道的影响。结果表明:(1)采用Gaussian曲线函数,能够较好地拟合原位2扩4隧道CD工法开挖的空间效应;(2)采用CD工法施工,隧道空间纵剖面变形规律受邻近导坑掘进距离的影响,在各自导坑掘进方向上的约束对隧道变形的影响规律基本一致;(3)采用CD工法施工,能有效减缓收敛损失的释放,减小隧道前期洞壁变形,保证隧道开挖过程中工作面的稳定性。Based on the site monitoring and measured data from the enlarged excavation of Damaoshan Tunnel,the paper discussed the relationship between the space constraint and the heading distance in the heading face of the enlarged excavation tunnel.The obtained fitting curve was compared with the three type LDC curve and the neighboring pilot tunnel affected to the enlarged excavated tunnel was analyzed.The results showed that（1） the Gaussian curve function applied could well fit the excavated space effect of the CD construction method for the excavated tunnel enlarged from two-lanes to fourlanes.（2）With the application of CD construction method to the construction method,the deformation law of the tunnel space longitudinal cross section was affected by the heading distance of the neighboring pilot tunnel and the constraint of each pilot tunnel in the heading direction would be the same to the deformation law of the tunnel.（3）The application of the CD construction method to the construction could effectively slow down the releasing of the convergence loss,could reduce the early chamber deformation of the tunnel and ensure the stability of the heading face during the tunnel excavation process.

关 键 词：2扩4隧道 CD工法 空间效应 MATLAB软件 收敛损失 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]