Radial Deformations Induced by Groundwater Flow on Deep Circular Tunnels
Radial Deformations Induced by Groundwater Flow on Deep Circular Tunnels
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DOI：
10.1007/s00603-006-0097-4
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发表时间：
2007-02
影响因子：
6.2
通讯作者：
Seok Woo Nam;A. Bobet
中科院分区：
文献类型：
--
作者：
Seok Woo Nam;A. Bobet
隧道施工过程中，隧道周围地表变形的大小和分布经常受到监测，并提供有关地表-支护相互作用和地表行为的关键信息。因此，重要的是要确定不同参数对地面变形的影响，以准确有效地评估在开挖过程中观察到的地面和支撑行为。本文研究了这样一种关系：渗流对径向变形的影响。在以下假设条件下进行了大量的数值分析：深圆形无支撑隧道，弹性地基，各向同性远场应力，干地或饱和地稳态渗水。分析涵盖了广泛的隧道尺寸，有效应力和孔隙压力。数值模拟结果证实了以前的解析解归一化径向变形背后的脸（即隧道侧的脸）的隧道开挖在干燥的地面，并已被用来提出一个新的分析公式归一化的径向位移的前面和后面的隧道面干燥和饱和的地面与水流。渗水显著增加了掌子面前方和掌子面处的归一化径向变形的大小和分布，但对掌子面后方的位移分布没有太大影响。
The magnitude and distribution of ground deformations around a tunnel are often monitored during construction and provide key information about ground-support interaction and ground behavior. Thus it is important to determine the effects of different parameters on ground deformations to accurately and effectively evaluate what contributes to ground and support behavior observed during excavation. This paper investigates one such relation: the effects of seepage on radial deformations. A number of numerical analyses have been conducted with the following assumptions: deep circular unsupported tunnel, elastic ground, isotropic far field stresses, dry ground or saturated ground with steady-state water seepage. The analyses cover a wide range of tunnel sizes, effective stresses, and pore pressures. Results from the numerical simulations confirm previous analytical solutions for normalized radial deformations behind the face (i.e. on the tunnel side of the face) of a tunnel excavated in dry ground, and have been used to propose a new analytical formulation for normalized radial displacements ahead and behind the tunnel face for both dry and saturated ground with water flow. Water seepage substantially increases the magnitude and distribution of the normalized radial deformations ahead of the face and at the tunnel face, but does not change much the displacement distribution behind the tunnel face.