互助北山特长隧道涌水量预测研究

Research on Water Inflow Prediction of Extra-long Tunnel of Huzhu Beishan

【目的】为了给隧道设计和施工提供依据,需对隧道涌水量进行预测。【方法】以青海互助北山特长隧道为例,基于勘察报告,综合分析其自然地理情况和工程地质条件,对地表水和地下水化学特征进行详细分析,采用降水入渗系数法、地下径流模数法和地下水动力法等三种方法对隧址区涌水量进行预测分析。【结果】结果表明,采用地下径流模数法计算的结果对施工安全的保障更有利。【结论】研究成果对类似特长隧道涌水量预测具有一定参考意义。

[Purposes]In order to provide a basis for tunnel design and construction,it is necessary to pre⁃dict the water inflow of the tunnel.[Methods]Based on the investigation report,this paper took the extralong tunnel of Huzhu Beishan in Qinghai Province as an example,comprehensively analyzed its physical geography and engineering geological conditions,analyzed the chemical characteristics of surface water and groundwater in detail,and used precipitation infiltration coefficient method,underground runoff modulus method and groundwater dynamic method to predict and analyze the water inflow in the tunnel site area.[Findings]The results show that the calculation result of underground runoff modulus method is more favorable to the guarantee of construction safety.[Conclusions]This study has certain reference significance for the water inflow prediction of similar long tunnel.