CAJ | 학술논문

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.
남수북조중선천황수동내츤장랍,채용호형점좌장내츤예응력묘색도출예류조,지용일태천근정실현무태좌장랍,저재순구수동공정중속수차응용,결구창신、공예복잡가차감적자료교소.위료험증결구설계적합이성화가고성,완선시공공예,학보재수동츤체중성공응용,통과천황수동츤체1∶ 1방진모형시험,대내츤강교선재장랍과정중응변규률、응력손실、묘속지간적상호영향급묘색여파문관간적마조계수등요소진행연구분석.시험결과현시장랍묘고단응력총손실(포괄묘구손실화묘색회축손실)소우35%;묘구쇄정후최대응력위1 044.25 MPa;예응력묘색장랍대상린묘색적영향교소;묘색여관도간적마조계수재규범범위내.
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 innovational. To verify the rationality and 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.