摘要
南水北调中线穿黄隧洞内衬张拉,采用弧形垫座将内衬预应力锚索导出预留槽,只用一台千斤顶实现无台座张拉,这在盾构隧洞工程中属首次应用,结构创新、工艺复杂可借鉴的资料较少。为了验证结构设计的合理性和可靠性,完善施工工艺,确保在隧洞衬砌中成功应用,通过穿黄隧洞衬砌1∶1仿真模型试验,对内衬钢绞线在张拉过程中应变规律、应力损失、锚束之间的相互影响及锚索与波纹管间的摩阻系数等要素进行研究分析。试验结果显示张拉锚固端应力总损失(包括锚具损失和锚索回缩损失)小于35%;锚具锁定后最大应力为1 044.25 MPa;预应力锚索张拉对相邻锚索的影响较小;锚索与管道间的摩阻系数在规范范围内。
A curvilinear anchor-cable prestressing device was set in a preformed groove, with which the circular anchor-cable was tensioned with a jack and was used for the inner lining of the tunnel of South-North Water Transfer Project through the Yellow River. It was the first application in the shield-driven tunnel, and its structure is innova- tional. To verify the rationality and reliability of structural design, a scale 1：1 simulation model was made at site. The law of strain, loss of stress, interaction among anchor beams and friction factor between anchor cable and corrugation pipe were all researched. The results showed as follows： The total loss of stress in the anchor-cable tensional end（ including the loss of anchor and retraction loss of anchor-cable） is less than 35% ; the maximum stress is 1 044.25 MPa after anchor locked; the effect of prestressed anchor-cable tension on adjacement ones is less; friction coefficient between the anchor-cable and pipelines is within the range of specification.
出处
《长江科学院院报》
CSCD
北大核心
2010年第4期61-65,共5页
Journal of Changjiang River Scientific Research Institute
基金
国家十一五科技支撑计划项目(2006BAB04A11)
关键词
穿黄隧洞
环锚预应力
锚索应力应变
摩阻系数
tunnel through the Yellow River
circular anchor prestress
anchor stress-strain
coefficient of friction
