利用环境同位素预测秦岭特长隧道的突水风险

Risk Prediction of Water Inflow into Extra-long Qinling Tunnel with Environmental Isotopes

对比地表水和下部地下水中环境同位素氘(D)和氚(3H或T)的数据表明,秦岭特长隧道北坡F4区域断层的水力传导性差,流经该断层的石砭峪河水与下部地下水无直接的水力联系.利用环境氚定量计算出河水对该段隧道潜在突水水量的贡献不足6%,从而完全排除了石砭峪河水通过F4区域断层溃入该隧道的可能性.

A comparison of environmental isotopes D and 3H in surface water and deep underground water shows that F4, a regional fault in the northern slope of extralong Qinling tunnel, has a poor hydraulic conductivity and there is no direct hydraulic connection between Shibianyu river flowing across fault F4 and deep underground water. The calculated result with environmental isotope tritium shows that the possible amount of water inflow into the tunnel from the river will be less than 6% of total possible water amount. For this reason, there is no the possibility that water in the river flows into the tunnel through fault F4.