试验机弹性储能对岩石力学性能测试的影响

EFFECT OF ELASTIC ACCUMULATION ENERGY OF TESTING MACHINE ON THE MECHANICAL MEASUREMENT OF ROCKS

在材料试验机上进行岩石力学性能测试时,如何准确测量岩石的变形是整个测试分析的基础.为了具体考察试验机刚度对岩石变形测量的影响程度,在两台不同的试验机上进行了岩石的单轴压缩试验,通过对加卸载过程中试验系统及岩石能量变化的分析,详细研究了试验系统弹性储能对岩石变形测量的影响,进而给出了基于试验机刚度的修正计算方法,来确定岩石在测试过程中的变形.

It is a fundamental problem of the rock mechanical measurements in material testing machine how to measure the rock deformation exactly. Rock uniaxial compression tests were carried out in two different testing machine so as to investigate the effect of machine stiffness on the deformation measurement. The energy transfer and conversion of testing system and sample during the loading and unloading processes are analyzed in this paper. It is found that the elastic accumulation energy of material testing machine affects the mechanical measurement of rocks. Moreover a revised method is proposed which can be adopted to calculate the deformation of rock during the test.