浅埋软岩隧道式锚碇稳定性原位模型试验研究

发布时间：2018-04-13 02:08

本文选题：软岩 + 隧道锚　；参考：《岩土工程学报》2017年11期

【摘要】：为了研究高拉拔荷载作用下浅埋软岩(泥岩)隧道式锚碇的稳定性(强度特性、变形规律及长期稳定性),以某在建的长江大桥隧道式锚碇工程为依托,开展了缩尺比例为1∶10的浅埋软岩(泥岩)隧道式锚碇原位模型试验(蠕变试验、极限破坏试验)。研究发现:浅埋软岩(泥岩)隧道式锚碇具有较高的承载能力,在设计荷载甚至在高于设计荷载几倍的荷载作用的情况下,其蠕变变形呈现出基本上趋于稳定的趋势,具有一定的长期稳定性。其破坏模式为锚塞体上方的岩体破裂成块体状,锚塞体下方沿与岩体接触面产生整体错动,破坏的下边界为锚塞体与岩体的接触带,锚塞体混凝土未发生破坏。此外,还探讨了在高拉拔荷载作用下,锚塞体地表围岩蠕变变形的空间分布规律以及锚塞体地表围岩、深部围岩各部位的变形规律。研究成果可为类似的工程提供参考和借鉴。
[Abstract]:In order to study the stability (strength characteristics, deformation law and long-term stability) of shallow soft rock (mudstone) tunnel Anchorage under high pull-out load, a tunnel Anchorage project of the Yangtze River Bridge is under construction.The in-situ model test (creep test, limit failure test) of shallow buried soft rock (mudstone) tunnel Anchorage with a scale ratio of 1:10 is carried out.It is found that the shallow soft rock (mudstone) tunnel Anchorage has a high bearing capacity and its creep deformation tends to be stable when the design load is even several times higher than the design load.Has certain long-term stability.The failure mode is that the rock mass above the anchor plug is broken into a block, the bottom of the anchor plug is dislocated along the interface with the rock mass, the lower boundary of the failure is the contact zone between the anchor plug and the rock mass, and the concrete of the anchor plug has not been destroyed.In addition, the spatial distribution of the creep deformation of the surrounding rock of the anchor plug and the deformation law of the surrounding rock in the deep part and the surrounding rock on the surface of the anchor plug are also discussed under the action of high drawing load.The research results can provide reference for similar projects.
【作者单位】：重庆大学土木工程学院;山地城镇建设与新技术教育部重点实验室(重庆大学);长江科学院重庆岩基研究中心;中国共产党临沂市委员会党校;
【基金】：国家自然科学基金面上项目(41772319);国家自然科学基金青年基金项目(51409013) 2015重庆市研究生科研创新项目(CYB15038)
【分类号】：U448.25

【相似文献】