双线暗挖隧道下穿既有城市主干道施工方法比选  

Selection on Construction Method of Double Track Tunnel Crossing Under the Existing City Main Road

作　　者：李现者[1] 袁金秀[1] 王道远[1,2] 郑阳[3] 

机构地区：[1]河北交通职业技术学院土木工程系,河北石家庄050091 [2]西南交通大学土木工程学院,四川成都610031 [3]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《公路工程》2013年第5期75-78,93,共5页Highway Engineering

基　　金：河北省高等学校自然科学青年基金项目(Q2012107)

摘　　要：以某双线暗挖隧道下穿既有城市主干道为工程背景,利用FLAC-3D有限差分软件对WSS加固条件下上下台阶法、上下台阶增设临时仰拱法和上半断面预留核心土法进行对比分析,着重研究了既有主干道沉降,在建暗挖隧道受力、收敛、掌子面挤出位移以及塑性区开展深度进行分析。分析表明,上下台阶增设临时仰拱法达到了经济与安全的平衡,是较为合适的穿越方法。Based on the engineering practice of double track tunnel undercrossing the existing city main road.In condition of WSS,comparativve analysis to diffrerent construction methods of bench excavation,bench excavation with temporary inverted arch and upper bench excavated arcingly with core soil are carried on by FLAC-3D software.a suitable construction method is provided by analyzing existing road settlement,arch top settlement,tunnel space convergency,the lining stress value,horizontal displacement of excavated face and depth of plastic zone.The results show that the balance of economic and security is attained by the second method.it give a good reference to similar works.

关 键 词：双线隧道 下穿 施工方法 比选 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]