穿黄隧洞预应力双层复合衬砌结构受力特性研究  

Mechanical Behavior of Prestressed Double Composite Linings of Yellow-River-Crossing Tunnel

作　　者：谢小玲[1,2] 苏海东[1,2] 

机构地区：[1]长江科学院水利部水工程安全与病害防治工程技术研究中心,武汉430010 [2]长江科学院材料与结构研究所,武汉430010

出　　处：《长江科学院院报》2011年第10期180-185,共6页Journal of Changjiang River Scientific Research Institute

基　　金："十一五"国家科技支撑计划项目(2006BAB04A11)

摘　　要：结合穿黄隧洞衬砌1∶1仿真模型试验,采用三维非线性有限元方法进行计算分析,跟踪对比试验中无垫层衬砌段(联合承载)、有垫层衬砌段(独立承载)2种结构的试验监测数据,研究这种新型双层复合衬砌结构的受力特性。计算采用考虑接触的非线性有限元方法,模拟仿真模型试验中管片拼装、分层填土、内衬预应力张拉,以及内水压力施加(充水)的实际过程,研究管片之间以及内外衬之间的缝隙状态和传力机理。研究结果显示:即使内、外衬处于完全张开状态,无垫层模型的预应力荷载也可以通过插筋传递到外衬,表明插筋是实现内外衬砌联合承载的重要结构措施;有垫层模型内外衬砌具有独立承载特性。计算与试验成果对比显示,无论是结构变形、缝隙开度还是衬砌应力,两者规律一致、数值接近,其研究成果可供类似工程参考借鉴。The mechanical behavior of double composite linings of the Yellow-River-Crossing tunnel is analyzed by using 3-D non-linear finite element method when contacts between assembled segments of outer linings,and contacts between the inner and outer linings are considered.The above numerical calculation is compared with the 1：1 simulation test of two models with and without cushions between the inner and outer linings.The test process,inclusive of the segments assembling,layered earth filling,pretensioning of inner linings,and the applying of water pressure,is fully simulated.In the model without cushions,despite the fully-opened gap between the inner and outer linings,pretension loads upon the inner linings are partly transferred to the outer linings through steel bars,which is proved to be critical for joint load-bearing of the double linings;whereas in the model with cushions,stresses of the outer linings increase slightly under the pretension and water pressure loads,revealing that the inner linings are subjected independently to these loads.The numerical values are close to test values in terms of the distortion,the stresses,and the gap between the inner and outer linings.

关 键 词：南水北调 穿黄隧洞 双层复合衬砌结构 三维有限元 接触非线性 

分 类 号：TV554.14[水利工程—水利水电工程]