盾构管片横向大变形TRC控制方法及作用机制研究

发布时间：2018-03-25 14:39

本文选题：隧道工程　切入点：纤维编织网增强混凝土　出处：《岩石力学与工程学报》2017年08期

【摘要】：为有效控制盾构管片的横向变形,分析盾构隧道的加固特点和常用内表面加固方法存在的不足,提出纤维编织网增强混凝土(textile-reinforced concrete,TRC)控制方法。建立TRC加固层及界面模拟方法,并利用试验结果验证该方法的合理性,进一步采用数值手段研究隧道横向变形和顶拱接头张开量在不同地层刚度系数、加固时机、纤维编织网用量和加固层布置范围下的响应规律。在此基础上,结合管片的变形和内力规律,揭示TRC控制管片横向变形的作用机制。研究表明:TRC能有效控制隧道横向变形和顶拱接头张开量,地层刚度系数越小,控制效果越优异;加固前隧道已有变形会造成纤维编织网产生损失应变,已有变形越小,损失应变越小,控制效果越好;纤维编织网用量提高,控制效果增强,但纤维编织网利用率降低,因此增强趋势减弱;TRC加固层合理布置范围建议在顶拱反弯点间的受拉部位,在该范围内,加固层越长,控制效果越好。研究结果丰富了管片内表面加固方法,深化了内表面加固机制的认识,可为工程实践提供理论指导和技术支持。
[Abstract]:In order to effectively control the transverse deformation of shield segment, the characteristics of shield tunnel reinforcement and the shortcomings of common internal surface strengthening methods are analyzed. The control method of fiber woven net reinforced concrete reinforced concrete (TRC) is put forward. The TRC reinforcement layer and interface simulation method are established. The rationality of the method is verified by the experimental results, and the transverse deformation of tunnel and the opening of top arch joint in different strata are further studied by numerical method. On the basis of the amount of fiber woven net and the response law of reinforcement layer layout, combining with the deformation and internal force law of segment, The research shows that TRC can effectively control the transverse deformation of tunnel and the opening of the top arch joint, and the smaller the stiffness coefficient of the stratum, the better the control effect. The deformation of the tunnel before reinforcement will result in the loss strain of the fiber weaving net, the smaller the deformation, the smaller the loss strain, the better the control effect is, the higher the amount of fiber weaving net, the better the control effect, but the lower the utilization ratio of fiber weaving net is. Therefore, the strengthening trend is weakened and the reasonable arrangement range of TRC reinforcement layer is suggested to be in the tension position between the reverse bending points of the top arch. In this range, the longer the reinforcement layer is, the better the control effect is. The research results enrich the method of strengthening the inner surface of the segment. It can provide theoretical guidance and technical support for engineering practice.
【作者单位】：中国矿业大学力学与建筑工程学院;同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家自然科学基金资助项目(51508584,51622404) 中央高校基本科研业务费(2017QL02)~~
【分类号】：U455.43

【共引文献】