Study of determining permeability coefficient in water inrush numerical calculation of subsea tunnel

LI Shu-cai; ZHAO Yan; XU Bang-shu; LI Li-ping; LIU Qin; WANG Yu-kui

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Study of determining permeability coefficient in water inrush numerical calculation of subsea tunnel

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- Study of determining permeability coefficient in water inrush numerical calculation of subsea tunnel
- Vol. 33, Issue 5, (2012)
- 作者机构：
  
  1. 山东大学岩土与结构工程研究中心,济南,250061
  2. 青岛市地下铁道公司,山东,青岛,266071
  3. 中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏,徐州,221008
- 作者简介：
- 基金信息：
- DOI：
  CLC： U614
- Online First：14 May 2012，
  
  Published：2012
- 稿件说明：
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LI Shu-cai, ZHAO Yan, XU Bang-shu, et al. Study of determining permeability coefficient in water inrush numerical calculation of subsea tunnel[J]. 2012, 33(5).
DOI：

LI Shu-cai, ZHAO Yan, XU Bang-shu, et al. Study of determining permeability coefficient in water inrush numerical calculation of subsea tunnel[J]. 2012, 33(5). DOI：

摘要

海底隧道的建设往往伴随着高风险，而水害则是海底隧道建设期间风险最主要的来源之一，隧道涌水对施工安全与建成后的运营成本控制有着重要影响，因此，对海底隧道进行涌水量预测便显得尤为重要。数值计算方法是当前涌水量预测中应用最广的方法之一，而计算涌水量过程中最关键的问题之一是渗透系数的确定。以青岛胶州湾海底隧道工程为背景，通过数值计算、模型试验与现场监测数据分析等手段相结合的方法，对海底隧道建设期涌水量的预测进行了研究。首先进行海底隧道开挖后涌水量现场监测，得到开挖后涌水量变化曲线；再采用数值计算方法对围岩渗透系数的取值进行反分析，对渗透系数进行不断修正，并在数值计算中成功拟合实测涌水量曲线，所得到的渗透系数即为数值计算中应采用的合理渗透系数。在结合试验段地质情况的基础上将合理渗透系数与前期地勘压水试验得到的渗透系数进行比对，得到两者之间的关系。并通过模型试验的手段对以上结论进行验证。将其应用到海底隧道的涌水量预测中，通过正演数值计算预测围岩相似洞段的涌水量，其结果对海底隧道涌水量预测有一定的参考意义。

Abstract

The construction of subsea tunnel is high risky and water inrush is one of the main risk sources. If water inrush into the tunnel

it will have an important influence on the safety of construction as well as the control of operation cost after the subsea tunnel is completed. So making water inrush forecast is very important in the construction phase. Numerical analysis is the most popular method used in the prediction of water inrush at present

of which ascertaining the permeability coefficient is one key problem. Taking Qingdao Jiaozhouwan Subsea Tunnel as the project background

this paper deals with water inrush forecast during the subsea tunnel construction period by comprehensive usage of numerical computation

model test and local monitoring data analysis. Firstly

variation curves of the water inrush are got by monitoring the water inrush after tunnel excavation. Then numerical method is used to calculate the water inrush. During the process of calculating

parameters are adjusted constantly to fit the curve successfully. The permeability coefficient obtained is reasonable; it should be used in the numerical computation. Combined with the model geology

the relationship between the reasonable permeability coefficient and the permeability coefficient which is got from geological packer test in the early stage is obtained by comparison. Then model test is used to verify above conclusions. Finally

the conclusions can be used to other sections of subsea tunnel to make water inrush forecast. The result has significance for practice reference.

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