岩石非线性弹性对岩石物理实验的影响研究

Study on the Influence of Rock's Nonlinear Elasticity on Rock Physical Experiment

非线性弹性是岩石的一种很普遍的性质,其主要原因分为2个大的方面:一是岩石内部存在两类不同的空隙,在受压后反应不一致,导致岩石本身的各种参数模量随之而呈现非线性变化,这给岩石物理实验的测定带来了不确定因素。二是岩石本身存在滞后效应,本文将从岩石物理实验出发,精确测定了CQ地区块岩石样品随着压力增加,纵波速度的变化情况,并加以分析,提出改进实验精度的几点建议和意见。

The main reasons of nonlinear elasticity, which is a common nature of rock, are divided into two major aspects： first, after being pressured, the two different types of interstices that existing in internal rocks have inconsistent response, which results in nonlinear changes of the various parameters modulus of the rock. This brings uncertain factors to the determination of rock physics experiments. Second, the rook has hysteresis effect itself. Starting from the rock physical experiments, the paper accurately determines and analyzes the changes of CQ regional rock samples＂ P-wave velocity with increasing pressures, and proposes several opinions for improving experimental precision.