海底隧道涌水量的预测及其应用研究

文章采用理论分析方法,推导了均质围岩中海底隧道注浆圈外表面、衬砌外水压力及涌水量的理论解析公式,并分析了涌水量与各量值之间的关系。通过对地下水渗流场数学模型研究,采用等效连续介质模型用数值方法分析了隧道渗流场的分布,计算出海底隧道的每延米涌水量,并与理论解析解进行了对比分析。结果表明,海底隧道的涌水量不仅与围岩和注浆圈的渗透系数的比值关系密切,而且还与隧道的半径、远场水压力、注浆圈的半径有关;数值计算所得结果与理论解析公式计算得到的涌水量基本一致;为了确保海底隧道施工及运营的安全,应采取"以堵为主,限量排放"的治水方案。

Prediction and Research on Water Inflow for a Subsea Tunnel

Authors of the paper by using theoretical method deducted the formulae for the water pressure acting on,and the water inflow passing through,the outer surface of grouted ring and lining back,and analyzed the relationship between water inflow and other parameters.Based on the study of seepage field numerical model,equivalent continuum model and numerical method were used to analyze the water inflow of a subsea tunnel with the results compared with theoretical solutions.Results indicated that water inflow is not only dependent upon the coefficient of permeability of surrounding rocks and grouted ring,but also upon the radius of the tunnel,the thickness of grouted ring and external water pressure.Results of numerical analysis and theoretical deduction were well consistent with each other.The principle of 'taking water-stopping precedence of restricted drainage' should be followed for the safety of construction and operation of subsea tunnels.