...
  • 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 >Excavation-induced hydraulic conductivity reduction around a tunnel - Part 1: Guideline for estimate of ground water inflow rate
【24h】

Excavation-induced hydraulic conductivity reduction around a tunnel - Part 1: Guideline for estimate of ground water inflow rate

机译：开挖引起的隧道周围水力传导率降低-第1部分：估算地下水流入量的准则

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

Field observations indicate that current engineering practice does not consistently estimate ground water flows into unlined rock excavated tunnels due to various factors that analytical solutions do not take into account. These factors include significant geological features, groundwater drawdown, inadequate estimates of hydraulic conductivity from packer tests, and stress-induced rock-mass permeability reduction in the vicinity of tunnel (lining-like zone). A key variable that is not properly accommodated in current practice, is the hydro-mechanical interaction within the joints in the surrounding rock mass. The significance of this variable is discussed in the 1st part of the paper which presents an analytical solution assessing ground water inflow rate into a tunnel using a mathematical derivation that takes into account the excavation-induced rock permeability reduction in the vicinity of a tunnel based on hydro-mechanical coupling effect. In the 2nd part of the paper, results from numerical analysis are presented to verify the proposed analytical solution for estimating ground water inflow rate into a tunnel. Further studies are currently underway to identify other key variables and their impact on the behavior of unlined tunnels and hydrological flow regime in the surrounding fractured rock mass using a distinct element method program which can fully consider hydro-mechanical coupled behavior of joints.
机译：现场观察表明，由于分析解决方案未考虑的各种因素，目前的工程实践并不能始终如一地估算流入无衬砌岩石开挖隧道的地下水流量。这些因素包括显着的地质特征，地下水流失，来自封隔器试验的水力传导率估计不足以及隧道附近（衬砌状区域）应力引起的岩体渗透率降低。当前实践中未适当适应的一个关键变量是围岩中节理内的水力-机械相互作用。在本文的第1部分中讨论了此变量的重要性，该部分提出了一种分析解决方案，该方法使用数学推导来评估地下水流入隧道的速度，该数学推导考虑了基于隧道的开挖引起的岩石渗透率降低，基于水力耦合效应。在本文的第二部分中，给出了数值分析的结果，以验证所提出的用于估算隧道中地下水流入量的分析解决方案。目前正在开展进一步研究，以使用可充分考虑节理的水力-机械耦合特性的独特单元法程序，确定其他关键变量及其对周围裂隙岩体中无衬砌隧道的行为和水文流动状况的影响。

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