公路偏压隧道开挖及支护的数值模拟研究  

Numerical simulation study on excavation and lining support of partial-pressured highway tunnels

作　　者：董淑乾[1] 魏云杰[2] 朱剑[2] 

机构地区：[1]成都理工大学"地质灾害防治与地质环境保护"国家重点实验室,成都610059 [2]北京工业大学"城市与工程安全减灾"省部共建教育部重点实验室,北京100124

出　　处：《成都理工大学学报（自然科学版）》2010年第2期201-205,共5页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金："十一五"国家科技支撑计划项目(2006BAJ05A02;2006BAJ27B05)

摘　　要：在查明隧道围岩工程地质条件的基础上,运用有限元研究了公路隧道开挖与支护过程中的应力、位移及塑性区的分布规律。结果表明,锚喷支护对于控制围岩拱顶和底鼓的变形作用明显,拱顶竖向位移在施作锚喷支护后增幅明显减小,在二次衬砌施作之前趋于稳定;隧道稳定性最不利位置在拱顶、拱腰和底部,建议设计时适当增加锚杆的数量,施工时要加强初期支护并控制好喷射混凝土的厚度,防止过大的回弹变形。On the basis of tunnel geological conditions investigation, this study adopts the finite element to analyse stress, displacement and plastic zone distribution rules in the process of highway tunnel excavation and lining supports. Bolt and shotcrete support obviously controls rock vault and floor heave deformation. The vault vertical displacement significantly is reduced after finishing bolting and shotcrete support and stabilized before finishing the secondary lining. The results show that the most disadvantageous positions are in the dome, arch crown and bottom of the tunnel. So, people should increase the number of bolts in the design, strengthen the initial support and control the thickness of shotcrete to prevent excessive resilient deformation in the process of construction. The relevant conclusions can be made to aid highway tunnel construction and design.

关 键 词：公路隧道 有限元模拟 喷锚支护 塑性区 

分 类 号：U455[建筑科学—桥梁与隧道工程]