首先依据弹性波理论对影响纵横波波速的参数进行分析,明确影响横波波速的参数主要包括密度、应力载荷及应变量.根据分析结果,分别测试不同岩性、饱和状态、围压及轴压条件下的岩石纵横波波速.最后以实验结果为最初样本,通过训练LM-BP神经网络,对横波波速实验结果进行拟合,拟合平均相对误差为2.22％.结果表明,岩性、含气性及应力状态是影响纵横波波速主要因素,利用LM-BP神经网络的多条件拟合横波波速具有更高的精度.%Using elastic wave theory,the parameters such as density,stress,and strain that affect the velocity of P-wave and S-wave are analyzed.The velocities of P-wave and S-wave are tested subsequently in different lithology,saturation state,ambient pressure and axial pressure conditions.Finally,the average relative error is estimated as 2.22％ utilizing the LM-BP neural network fit with experimental results.The results show that the lithology,saturation state and stress state are key factors that influence the relationship of the P-wave and S-wave velocity.To obtain higher accuracy,the LM-BP neural network can be used to fit the S-wave speed under multi-condition.
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