从地震层析速度确定原位岩土力学参数

摘要

地震纵横波层析成像速度与岩土弹性力学参数有关，多道面波分析（MASW）采用类似二维反射地震处理，得到共中点互相关道集（CMPCC）提取面波频散曲线，由面波频散曲线反演二维速度结构，在岩土结构分层等方面有良好的效果。通过同一剖面的折射地震波层析成像得到纵波速度结构，对岩土层的动弹模量和泊松比等力学参数进行分析，为下一步地质工程设计及岩土力学试验提供参考。%The tomography velocity of compress and shear seismic wave is related with the mechanic parameters of rock and soil.The dispersion curves of the multi channel analysis of surface wave method (MASW)can be gotten from the common middle points cross correlation (CMPCC )gather which is processed as same as the reflection seismic method.We can get the 2D velocity structure from inversing dispersion cures in whole profile,it is well applied in the layering rock and soil strata.The elastic mechanics parameters,such as elastic module and poisson ratio,etc can be deduced by comparing the refraction tomography velocity with surface wave veolocity in the same profile,to supply the useful information in the next engineering geology exploration and design,rock and soil mechanics experiment in the laboratory as well.