为能定性描述围岩的软弱特性，提出瞬变电磁电阻率作为初始模型的隧道地震速度曲线反演方法。具体步骤为： 1）详细分析隧道地震数据特征，提出反视速度叠加方法提取叠加道集，以降低单道波形的误差，提高后期的反演精度； 2）提出适用于隧道地震数据的波阻抗反演方法，得到超前方向相对可靠的速度曲线； 3）为克服速度反演时的多解性问题，依据Faust公式建立速度和电阻率的联系，将瞬变电磁反演得到的视电阻率数据转化为初始速度模型，提高速度曲线的反演精度。模型数据的反演结果证明了反视速度叠加方法的合理性和初始速度模型的重要性；实测数据的反演结果表明，应用视电阻率约束的速度反演曲线能较好地提高超前方向速度曲线的反演精度，后期开挖结果也验证了速度曲线的合理性。

To qualitatively describe the weak characteristics of surrounding rock, an inversion method for seismic velocity curve based on transient electromagnetic resistivity is proposed. The specific steps are as follows: (1) The characteristics of tunnel seismic data are analyzed in detail, and the reverse velocity stack method is proposed to extract stack gather, so as to reduce the error of single channel waveform and improve the inversion accuracy in the later stage. (2) The tunnel seismic wave impedance inversion method is proposed to calculate relatively reliable velocity curve in the advance direction. (3) To overcome the multisolution problem in velocity inversion, the relationship between velocity and resistivity is established according to the Faust formula. The apparent resistivity data provided by the TEM is converted into the initial velocity model to improve the precision of wave impedance inversion. The inversion results of the model data prove the rationality of the inverse velocity stack method and the importance of the initial velocity model. The inversion results of the measured data show that the velocity inversion curve with apparent resistivity constraint can better improve the inversion accuracy of the velocity curve in the advance direction. Later excavation results also verify the rationality of the velocity curve.