基于中洞法+CRD法施工的纵向开挖间距研究  

Research on Longitudinal Excavation Spacing Based on CRD Method

作　　者：李钧[1] 沈义[1] 孙宇[1] 李丽[1] Li Jun;Shen Yi;Sun Yu;Li Li(Heilongjiang Institute of Construction Technology,Harbin Heilongjiang 150050,China)

机构地区：[1]黑龙江建筑职业技术学院,黑龙江哈尔滨150050

出　　处：《城市建筑》2021年第6期184-186,共3页Urbanism and Architecture

摘　　要：针对双连拱隧道受力复杂的特点,以哈尔滨保健路下穿植物园隧道工程为依托,通过建立空间有限元模型,对基于中洞法+CRD法施工的纵向开挖间距进行研究。结果表明,在开挖单个洞的过程中,围岩区域中受开挖面影响较大的为已开挖的掌子面后方与未开挖的掌子面前方的安全距离;左右洞开挖分别会对另一侧洞室围岩变形产生影响,且后开挖的洞体对先开挖的洞体造成的影响要大于先开挖洞体对后开挖洞体的影响;开挖过程中,左右洞掌子面纵向间距应保持的安全距离。In view of the complex characteristics of double-arch tunnel,based on the Harbin Health Care Road under the Botanical Garden Tunnel Project,through the establishment of spatial finite element model,the longitudinal excavation spacing based on the middle tunnel method+CRD method is studied.The results show that for single tunnel excavation,the surrounding rock area affected by the excavation face is 0.5 d in front of the face(not excavated)and 1.5 d behind the face(excavated),and the excavation of the left and right tunnels will affect the surrounding rock deformation of the other side of the tunnel respectively,the influence of right hole excavation on left hole is greater than that of left hole excavation on right hole(adopting the construction plan of"left hole in front,right hole in back").

关 键 词：隧道施工 中洞法+CRD法 纵向开挖间距 有限元模型 

分 类 号：TU378.2[建筑科学—结构工程]