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多次覆盖反射波勘探是地震勘探中精度高、应用广的方法之一,由于浅层勘探的反射波信号容易被面波、声波干扰,使得该方法在进行浅部探测时不能取得较好的效果。而瞬态瑞雷波勘探在浅层勘探中具有较高的探测精度,其结果是探测排列下岩土体速度的综合反映。鉴于此,本文采用多次覆盖采集的滚动采集模式,将一维的瞬态瑞雷波勘探变为二维,从而得到测线下岩土体剪切波速度的二维分布。通过与浅层地震反射波勘探进行对比分析,结果表明,在浅层采空区勘探中,二维多道瞬态瑞雷波勘探具有较高的分辨率。因此,在浅层地震反射波勘探过程中,如果面波发育,可进行浅层地震反射波与瞬态瑞雷波联合勘探,以提高勘探结果的准确性。
Repeatedly covering the reflection wave exploration is one of the methods of high precision and wide application in seismic exploration. Because the reflected wave signal of the shallow exploration is easily disturbed by surface waves and acoustic waves, the method can not obtain better effect. The transient Rayleigh wave exploration in shallow exploration has a higher detection accuracy, the result is a comprehensive reflection of the rock mass arrangement speed. In view of this, this paper adopts rolling acquisition mode of multiple coverage acquisition to change one-dimensional transient Rayleigh wave exploration into two-dimensional, so as to obtain the two-dimensional distribution of shear wave velocity of rock and soil under the survey line. Through the comparison with the shallow seismic reflection wave exploration, the results show that the 2D multi-channel transient Rayleigh wave exploration has a higher resolution in the exploration of shallow goaf. Therefore, during the shallow seismic reflection wave exploration, if the surface wave develops, joint exploration of shallow seismic reflection wave and transient Rayleigh wave can be carried out to improve the accuracy of the exploration result.