下卧软弱夹层的软岩隧道式锚碇承载特性研究

发布时间：2018-04-24 14:53

本文选题：隧道工程 + 软弱夹层　；参考：《岩石力学与工程学报》2017年10期

【摘要】：为了研究下卧有软弱夹层的软岩隧道锚的承载特性,以拟建的某大桥隧道锚工程为依托,开展缩尺比例为1∶10的隧道锚原位模型试验。通过对模型锚开展荷载试验、蠕变试验和破坏试验等,隧道锚在下卧有软弱夹层的软弱围岩(泥岩)中,是具有一定的承载能力和长期稳定性的。该类隧道锚的拉力向和锚塞体前部的铅直向的地表围岩变形曲线以隧道锚中心轴线为对称轴分别近似呈现出"M"形和"倒V"形,铅直向地表围岩变形从锚塞体前端至后端逐渐减小。对于深部围岩变形,该类隧道锚在拉力向的变形控制应以锚间深部岩体变形为主,在铅直向的变形控制应以锚塞体前部深部围岩变形为主。此外,研究还得出下卧有软弱夹层的软岩隧道锚的破坏模式。研究成果可为类似的隧道锚工程的设计、施工等提供参考和借鉴。
[Abstract]:In order to study the load-bearing characteristics of soft rock tunnel anchors with weak intercalation, the in-situ model test of tunnel anchors with a scale of 1:10 was carried out on the basis of a proposed bridge tunnel anchor project. Through load test, creep test and failure test on model anchor, tunnel anchor has certain bearing capacity and long-term stability in soft surrounding rock (mudstone) with weak intercalation. The deformation curves of the tunnel anchors in the tensile direction and the vertical direction in the front of the anchors are approximately "M" shape and "inverted V" shape, respectively, with the axis of the tunnel anchor as the axis of symmetry. The vertical deformation of surrounding rock decreases gradually from the front end of the anchor plug to the back end. For the deep surrounding rock deformation, the deformation control of the tunnel anchor in the tensile direction should be dominated by the deep rock mass deformation between the anchors, and in the vertical direction, the deformation of the deep surrounding rock in the front of the anchor plug should be the main control. In addition, the failure mode of soft rock tunnel anchor with weak intercalation is obtained. The research results can provide reference for similar tunnel anchor engineering design and construction.
【作者单位】：重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;长江科学院重庆分院;
【基金】：国家自然科学基金资助项目(41772319)~~
【分类号】：U448.25

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