反复温度-应力耦合作用下引水隧洞变形特征  

Deformation Features of Diversion Tunnel Under Repeated Action of Coupled Thermal-Stress

作　　者：周建军[1,2] 彭浩[3] 邓华 

机构地区：[1]盾构及掘进技术国家重点实验室,河南郑州450001 [2]中铁隧道集团有限公司,河南洛阳471009 [3]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081 [4]中交武汉港湾工程设计研究院有限公司,湖北武汉430040

出　　处：《人民黄河》2015年第7期133-137,共5页Yellow River

基　　金：国家"863"计划项目(2012AA041802;2012AA041803);国家国际科技合作专项(2011DFB71550)

摘　　要：深埋引水隧洞在通过高地温区域时,伴随着开挖卸荷—通风降温—通水运行的全过程,隧洞围岩将经历反复的温度-应力耦合作用,使得围岩的变形破坏更为复杂。对齐热哈塔尔水电站深埋引水隧洞高地温洞段进行三维数值分析,详细研究了围岩在经历开挖、两次降温以及内水压力共同作用的全过程变形特征,比选了衬砌设计方案。结果表明:温度对围岩径向深度5 m范围内影响很大,此范围内围岩在经历反复温度-应力耦合作用后,不仅位移明显增大,而且可能会加重岩体损伤程度,但一定的内水压力有利于围岩稳定;施做二次衬砌能控制围岩变形,使原本隆起的拱脚变为下沉,但是仅通过增加二次衬砌厚度来抑制围岩变形和改善衬砌应力的作用是有限的。With the whole process from excavation to ventilation cooling and putting into operation,the tunnel surrounding rocks will experi ence a repeated action of coupled thermal stress so that the failure features of surrounding rocks are more complex for deep high geothermal tunnel. 3D numerical simulations on the Qirehataer high geothermal diversion tunnel were carried out. The deformation features of tunnels that experience excavation,two times cooling and internal water pressure were studied in detail and the design schemes of tunnel lining were com pared. The results show that the temperature has a great influence in 5m radial depth range of tunnel. The displacement is increased obvious ly and fatigue damage of rocks maybe aggravate when the surrounding rocks in this range experienced repeated action of coupled thermal stress,moreover a certain internal water pressure is beneficial for surrounding rocks stability. The secondary lining can effectively inhibit the deformation of surrounding rocks and change the deformation of arch foot from uplift to settlement,but only by increasing thickness of second ary lining to inhibit the deformation of surrounding rocks and improve lining stress is not reasonable.

关 键 词：引水隧洞 高地温 反复作用 温度-应力耦合 围岩变形 

分 类 号：U456.31[建筑科学—桥梁与隧道工程] TV672.1[交通运输工程—道路与铁道工程]