川西折多山区位于中国“Y”字形活动构造断裂区域，地处川藏交通廊道关键位置。针对该地区某在建隧道出现异常冷水涌突水的现象，为查明该地区的构造裂隙冷水循环机理，利用高精度数字高程模型（digital elevation model, DEM）数据解译识别、水化学与同位素分析，Landsat卫星影像分析、Visual Modflow数值模拟等方法对隧道构造裂隙水的补给来源和区域地下水循环模式进行讨论。结果表明，研究区内的大小构造裂隙大多为良好的导水通道；根据水化学测试结果，推测涌水水源为山体地下水静储量与外部冷水地下水的混合；隧顶上方常年性冰湖与冰蚀谷的冰雪融水共同构成了隧道涌水的外部冷水源，提出了大气降水+冰雪融水的“冰水双源补给”地下水循环机理概念模型；Visual Modflow数值模拟结果显示涌水集中于导水断裂带，二维模拟展示了冷水地下水由补给源至排泄基准的全径流过程以及剖面各部位径流强度的示意，验证了“冰水双源补给”涌水机理的合理性。

The Zheduo mountain area in western Sichuan Plateau is located in the "Y" -shaped active tectonic fault region of China, and is located in the key position of Sichuan-Tibet transportation corridor. In view of the phenomenon of abnormal cold water gusher in a tunnel in this area, in order to find out the mechanism of cold water circulation in structural fractures in this area, high-precision digital elevation model (DEM) data was used to interpret and identify, and hydrochemical analysis was carried out. Landsat satellite image analysis, Visual Modflow numerical simulation and other methods were used to discuss the recharge source of structural fracture water in a tunnel and the groundwater circulation model in the region. The results show that the large and small structural fractures in the study area are mostly good water channels. According to the results of water chemistry test, it is inferred that the source of water gusher is the mixture of the mountain groundwater static reserve and the external cold water groundwater. The external cold water source of cold water gusher is formed by the perennial glacial lake in the region together with the melting of snow and ice in the glacial valley. Combined with the above mentioned concept model, the groundwater circulation mechanism of "double-source recharge of ice and water" of atmospheric precipitation and snow and ice meltwater was proposed. The Visual Modflow numerical simulation results show that water gushing was concentrated in the water-conducting fault zone, and the two-dimensional simulation shows the whole runoff process of cold water groundwater from the recharge source to the discharge datum and the schematic diagram of the runoff intensity in each part of the profile, verifying the rationality of the water gushing mechanism of "ice-water double source recharge".