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中文摘要：
白鹤滩水电站施工期导流泄水采用隧洞导流方案。由于地下隧洞建设是一个动态过程,涌水量模拟预测需要跟随导流洞施工过程进行。基于坝址区右岸水文地质条件及其渗流场数值模型,随不断变化的内边界条件,利用TOUGH2软件分步模拟动态施工过程中的涌水量。各步分别模拟一定时间内开挖一定距离,期间可配合实现混凝土衬砌的模拟效果。计算结果显示,导流洞揭露渗透性良好的地层P2β53,P2β43及P2β13时,涌水量较大。此外,断层位置易突发大量涌水,尤其断层F17处。通过比较得知,若未考虑施工过程,计算结果将严重低估导流洞涌水量。使用的方法简单有效,便于修改,可实现多种施工方案下的洞内涌水动态模拟。以数学模型的方法模拟预测导流洞涌水量,可为导流洞施工及防渗排水方案的制定提供科学依据。
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