The water inrush is one of the main geologic hazards in the construction of deep-buried long tunnel, especially in karst region. Therefore, it is of great importanct to forecast and analyze the quantity of water inrush. Taking a water diversion project in central Yunnan Province for example, the three dimensional mathematical model of seepage flow was established based on the groundwater model software GMS by consideration of aquiferous medium, the hydrogeological structure of rock mass, the characteristics of groundwater flow system and the chemistry of groundwater of tunnel. Compared with the results of traditional cal-culation method and emprical formula, the calculation result differences are analyzed and the feasibility of the numerical computa-tion method was proved. By the model, we make a further systematic prediction of the water inrush quantity in different periods of construction, as well as make an in-depth analysis of construction impacts on surrounding groundwater.%涌突水是深埋长隧洞施工中最为突出的地质灾害之一,尤其是在岩溶发育地区,做好涌水量预测分析是保证施工安全的前提. 以滇中引水工程某深埋长隧洞为例,基于地下水模型系统软件GMS,并结合隧洞穿越段地下水含水介质特性、岩体水文地质结构、地下水流动系统特征、地下水化学及其环境特点,建立了三维渗流场数值模型,经与传统经验公式相比较,对计算结果的差异性进行了分析,验证了数值计算方法的可行性.最后利用该模型对隧洞施工期不同工况下的涌水量进行了预测分析,并对周边地下水的影响进行论证,为工程设计和施工提供了科学的参考依据和技术支撑.
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