• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tunnelling and underground space technology >Collapsible characteristics of loess tunnel site and their effects on tunnel structure
【24h】

Collapsible characteristics of loess tunnel site and their effects on tunnel structure

机译：黄土隧洞的湿陷性特征及其对隧道结构的影响

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

During the infrastructure construction process in the loess region of Northwest China, some tunnels are inevitably located in collapsible loess strata, and the potential collapsible deformation of the surrounding loess may threaten the safety and stability of the tunnel structure. To investigate the functional mechanism of loess strata hydrocollapse for a tunnel structure, a large field water immersion test was conducted in this study on the ground surface above an existing loess tunnel. The subsidence of the strata and the mechanical response of the tunnel structure during long-term water immersion were measured and analysed to reveal the collapsible deformation characteristics of the loess tunnel site and their effects on the tunnel structure. The results show that the surface water could infiltrate into the base of the tunnel and that a large deformation occurred in the surrounding loess near the tunnel vault once the loess was wetted. As the water infiltrated to the burial depth of the tunnel, the base pressure increased significantly, the tunnel structure subsided and the inverted arch cracked. Therefore, for a loess tunnel with a relatively shallow burial depth, long-term water immersion above the tunnel should be avoided, and the possibilities of decreasing bearing capacity and tunnel foundation subsidence at the arch feet caused by wetting must be considered during design and construction.
机译：在西北黄土地区的基础设施建设过程中，一些隧道不可避免地位于湿陷性黄土层中，周围黄土的潜在湿陷性变形可能威胁到隧道结构的安全性和稳定性。为了研究黄土层水崩塌对隧道结构的作用机理，本研究在现有黄土隧道上方的地面上进行了大范围的水浸试验。通过对长期沉水过程中地层的沉陷和隧道结构的力学响应进行了测量和分析，揭示了黄土隧道现场的湿陷变形特征及其对隧道结构的影响。结果表明，地表水可能渗入隧道底部，一旦湿润黄土，在隧道拱顶附近的周围黄土中会发生较大的变形。当水渗入隧道的埋藏深度时，基础压力显着增加，隧道结构消退，倒拱裂开。因此，对于埋藏深度相对较浅的黄土隧道，应避免在隧道上方长期浸水，在设计和施工过程中必须考虑到因湿润而导致拱脚处的承载力下降和隧道地基沉陷的可能性。 。

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