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获取与瑞利波理论频散曲线相匹配的实测频散曲线是正确反演土层参数及分布的前提,表面波谱分析(SASW)法和频率-波数(F-K)法是求取瑞利波实测频散曲线的两种主要方法。采用传递矩阵法计算得到瑞利波在各种典型地层模型地表处时域内的振动信息,作为SASW法和F-K法的测试数据进行了模拟测试。分别将两种方法得到的实测频散曲线与理论频散曲线对比,分析了道距、偏移距和道数等测试参数的影响,以及两种方法对于各种典型地层的测试效果。结果表明,测试参数对两种方法的影响有所不同,选择合适的测试参数能够得到好的测试效果,道数相同时F-K法的测试效果优于SASW法,多通道F-K法的测试效果优于少通道F-K法。
Obtaining the measured dispersion curve that matches the dispersion curve of Rayleigh wave is the premise of correct inversion of soil parameters and distribution. The surface wave spectrum analysis (SASW) and frequency-wave number (FK) Two main methods of dispersion curve. The vibration information of Rayleigh wave in the time domain of the surface of various typical stratigraphic models was calculated by using the transfer matrix method. The simulation tests were carried out as the test data of SASW and F-K methods. The measured dispersion curves obtained by the two methods are compared with the theoretical dispersion curves respectively. The influence of the test parameters such as the track pitch, the offset distance and the number of lanes, and the test results of the two methods on various typical formations are analyzed. The results show that the influence of the test parameters on the two methods is different. Selecting the right test parameters can get a good test result. When the number of tracks is the same, the FK test results are better than the SASW test. The test results of the multi-channel FK test are better than those of the FK test Less channel FK method.