某偏压连拱隧道动态施工数值模拟分析  

Numerical Simulation Analysis of Dynamic Construction of Unsymmetrically Loaded Multi-arch Tunnel

作　　者：汪志刚 陈建春 WANG Zhigang;CHEN Jianchun(Geological Survey Institute of Jiangxi Provincial Nuclear Industry,Nanchang 330038,China)

机构地区：[1]江西省核工业地质调查院,南昌330038

出　　处：《路基工程》2024年第5期234-239,共6页Subgrade Engineering

摘　　要：结合某偏压连拱隧道施工过程中出现的病害,采用有限元软件ABAQUS6.10,对偏压连拱隧道开挖过程进行数值模拟。结果表明:偏压连拱隧道的多步骤开挖,引起围岩的多次扰动,从而影响边坡的稳定性,在进行中导洞、山侧隧道上台阶及谷侧隧道上台阶开挖时,这三个阶段对隧道与边坡的稳定性影响最大,必须及时合理进行支护;斜坡中开挖连拱隧道时,边坡的失稳是累进性过程,由近洞区首先发生挤出与塌落,随后扰动相对较远的边坡;由于存在偏压作用,中隔墙在连拱隧道受力体系中起到重要作用,为施工过程控制的一个关键部位。In relation to the diseases occurs in the construction of an unsymmetrically loaded multi-arch tunnel,finite element software ABAQUS6.10 was used to carry out numerical simulation of the tunnel excavation.The result shows that,multi-step excavation of unsymmetrically loaded multi-arch tunnel may cause multiple disturbance on the surrounding rock,and then affect the slope stability and,in three stages of excavation on the middle drift,the upper bench of the tunnel on mountain side and the upper bench of the tunnel on valley side,the influence on the stability of the tunnel and slope is greatest,thus proper supporting must be done in time;during the excavation of multi-arch tunnel in slope,the failure of slope is such a progressive process that extrusion and collapse firstly happens in the near-cavern region,then disturbs the relatively far slope;due to the action of unsymmetrical pressure,mid-partition plays an important role in the force system of multi-arch tunnel,and is the key part for control of the construction process.

关 键 词：连拱隧道 边坡 偏压 动态施工 施工力学 监测分析 

分 类 号：TU457[建筑科学—岩土工程]