花岗岩物理参数与纵波波速的关系分析

Relationship between P-wave velocity and physical parameters of granite

以花岗岩为例,用烘干法、水中称量法测试了其物理参数,用超声波直透法测试了其纵横波波速。在此基础上分析了花岗岩在干燥、天然和饱和状态三种状态下的纵波波速与含水率、密度、孔隙率、横波波速等物理参数之间的关系,确立了纵波波速与这些物理参数之间具有一元线性关系。其中,纵波波速与含水率具有一定的负相关性,与密度具有良好的正相关性,与孔隙率具有良好的负相关性,与横波波速具有一定的正相关性。同时,经过多元参数回归、分析和检验,确立了纵波波速与孔隙率之间,纵波波速与孔隙率、横波波速之间,均具有非常好的线性相关性。从而为通过孔隙率或通过孔隙率和横波波速对本地区花岗岩纵波波速进行预测和判定提供了试验依据,也为在不同地区针对不同岩性开展纵波波速与物理参数的相关性研究奠定了基础。

For an example of granite,this paper analyzes the relationship between P-wave velocity and physical parameters such as water content,density,porosity and S-wave in three states,dry,natural and saturated state.It is established for that there is a univariate linear relationship between P-wave velocity and these physical parameters of granite.Among them,there is a certain negative correlation between P-wave velocity and water content.It has a good positive correlation with density.It has a good negative correlation with porosity.It has a certain positive correlation with shear wave velocity.At the same time,through multiple parameter regression,analysis and test,it is established for that there is a very good linear correlation between P-wave velocity and porosity,and between P-wave velocity and porosity and S-wave velocity.This provides an experimental basis to predict and judge the P-wave velocity of granite in this area through porosity or porosity and S-wave velocity,and also lays a foundation for the study of correlation between P-wave velocity and physical parameters of different lithological in different areas.