为准确评估TBM掘进隧洞支撑轨道所用的轨排对隧洞排水能力的影响，依托某引水发电隧洞工程，将解析法和数值法2种手段相结合用于排水能力的分析，数值法算得的综合糙率代入解析公式，能准确预测在预报的涌水量条件下保证安全施工的泄流能力。该方法已在实际工程中应用，施工期间发生的数次大涌水情况下的计算过流能力与实际过流能力较符合，证明了文章所述排水能力计算分析方法的准确性与实用性。

The influence of track skeleton for track support of TBM tunneling on drainage capacity of a diversion power tunnel is estimated by analytical method and numerical method. The drainage capacity needed, which can guarantee the safe tunnel construction under different water gushing volumes, can be predicted by putting the comprehensive roughness gained from the numerical method into the analytical formula. The abovementioned method has been applied to practice. The results show that the calculated drainage capacity coincides with actual one well so as to prove the accuracy and practicability of the method.