荷载对钻孔应变测值影响的实验及力学解析

介绍了弦频钻孔应变仪和体积式应变仪二次地表荷载试验的结果。根据弹性力学的理论和方法,对钻孔地壳应变测量及荷载试验的力学模型、边界条件等予以简化,使得经典的集中力作用于半无限弹性体表面的布辛奈斯克(Boussinesq)解,可有条件地运用于钻孔应变测量中地表荷载变化问题的定量分析研究。所给出的实验方法、研究思路及计算方法等,对定量研究钻孔应变测量中的荷载干扰、研究岩石力学性质、制定台站钻孔应变观测技术标准及观测规范等具有一定意义。

Experimental result and theoretic analysis concerning the borehole strain responding to the load on earth's surface

In this paper, two loading experimental results are introduced by using both strong frequency borehole strain meter and volume strain gauge. According to the elastic mechanical theory and method, both mechanical model and boundary condition for strain measurement in borehole loading experiment are simplified. So classical focal force acts on Boussinesq' solution on the surface of half limitless elastic body. It may be applied in the quantitative research about the measure of borehole strain in variety of the loading on the surface. The experimental method, research thought and calculation method will supply the significant help for the quantitative research of the load disturbance in the borehole, the mechanical nature of rock, establishing observation technical standard and observation criterion and so on.