隧道过海段水压力及渗流量计算方法

为了研究三心圆隧道复合衬砌的渗流量及不同部位水压力大小,分别利用等效面积法和等效周长法求出不同注浆圈厚度、不同注浆圈渗透系数、不同初期支护渗透系数下三心圆隧道的渗流量及不同部位水压力折减系数的解析解;并与相同条件下不同工况的数值模拟值进行对比。结果表明:计算隧道渗流量时,等效面积法得到的解与数值模拟值最大相差0. 3%;等效周长法得到的解与数值模拟值相差1. 5%。计算初期支护外水压力折减系数时,等效面积法得到的解与数值模拟值最大相差4. 8%;等效周长法得到的解与数值模拟值相差4. 6%。计算二次衬砌外水压力折减系数时,等效面积法得到的解与数值模拟值最大相差7. 6%;等效周长法得到的解与数值模拟值相差7. 8%。

Study on Calculation Method of Water Pressure and Seepage Flow for Subsea Tunnel

In order to study the seepage flow and water pressure on the composite lining of three-centered circle tunnel, this paper calculated the analytical solution of seepage flow and water pressure reduction coefficient under different thickness of grouting circle, different permeability coefficient of grouting circle, different permeability coefficient of primary support by using equivalent area method and equivalent perimeter method. The simulation results were compared with those under different conditions, which shows that when calculating the seepage flow of the tunnel, the solution obtained by the equivalent area method differs by 0.3% from that obtained by numerical simulation; The solution obtained by equivalent perimeter method differs by 1.5% from that obtained by numerical simulation; When calculating the reduction coefficient of water pressure of the primary support, the solution obtained by the equivalent area method differs by 4.8% from the numerical simulation ; The solution obtained by equivalent perimeter method differs by 4.6% from the numerical simulation.; When calculating the reduction coefficient of water pressure of the second lining, the maximum difference between the solution obtained by the equivalent area method and the numerical simulation is 7.6%;There is a difference of 7.8% between the solution obtained by the equivalent perimeter method and the numerical simulation .