...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Computers and Geotechnics >Load reduction on high-filled cut-and-cover tunnel using discrete element method
【24h】

Load reduction on high-filled cut-and-cover tunnel using discrete element method

机译：离散元法降低高填挖挖隧道的荷载

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

High-filled cut-and-cover tunnels (HFCCTs) can help satisfy the tremendous demand for usable land. However, this reclamation tunneling method involves massive backfill over a cut-and-cover tunnel (CCT), which induces high overburden pressure on the tunnel. A better understanding of the mechanisms that can reduce this load could also help to reduce safety risks and design costs. To this end, the use of relatively low-compacted (RLC) soil can reduce the load on top of CCTs; however, the RLC soil layer makes the load transfer mechanisms more complex. Previous studies have either ignored the distinct properties of soils or focused mainly on their macromechanical properties. Thus, if micromechanical soil properties can be considered properly, then the load transfer mechanisms can be better understood. Backfill with different relative compaction ('R') levels must be considered: e.g., R = 90% for major backfill and R = 80% for the RLC layer placed over a HFCCT.Via a discrete element method (DEM) software program, this study investigated changes in vertical earth pressure (VEP) on HFCCTs relative to the thickness and spread distance of the RLC soil layer, the ratio of the width of the valley to the width of the CCT (referred to as the B/D ratio), and the slope angle. Parametric DEM studies were conducted to characterize these influential factors. The DEM study results show that a proper thickness and spread distance of the RLC soil layer can optimize the soil arching effect and reduce VEP on top of CCTs. The results also show that the B/D ratio and slope angle are relevant to the reorientation of the VEP.
机译：高填方的掩埋式隧道（HFCCT）可以帮助满足对可用土地的巨大需求。但是，这种开挖隧道方法涉及在“覆盖式”隧道（CCT）上进行大量回填，从而在隧道上产生较高的覆盖层压力。更好地了解可以减少这种负载的机制还可以帮助降低安全风险和设计成本。为此，使用相对低密度的土壤可以减少CCT顶部的负荷。但是，RLC土层使载荷传递机制更加复杂。先前的研究要么忽略了土壤的独特特性，要么主要关注土壤的宏观力学特性。因此，如果可以适当考虑微机械土壤特性，那么可以更好地理解载荷传递机理。必须考虑具有不同相对压实度（'R'）的回填：例如，对于主要回填，R = 90％，对于放置在HFCCT上的RLC层，R = 80％。通过离散元素方法（DEM）软件程序，研究调查了HFCCT的垂直土压力（VEP）相对于RLC土层的厚度和传播距离，谷宽与CCT宽度之比（称为B / D比）的变化，和倾斜角度。进行参数DEM研究以表征这些影响因素。 DEM研究结果表明，适当的RLC土层厚度和铺展距离可以优化土拱效应并降低CCT顶部的VEP。结果还表明，B / D比和倾斜角与VEP的重新定向有关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号