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导言采用光弹应变计研究岩石压力是光弹实验技术的最新友展,其与光弹模型实验之间的主要区别是,在新方法中是将某种透明的人工双折射材料作成光弹应变片粘贴在岩石(或支柱)上,直接测量岩石(或支柱)应力的分布和大小;或作成光弹元件,制成各种观测岩石压力和移动的仪器,而不是进行室内模型试验。由于光弹应变计能直接测量被测物件的应力方向和大小,其作用相当于无数个小电阻应变计,可作静力和动力测量,对岩石、金属、混凝土和木材的应力状态均能进行观测,不受物件表面形状和井下大气条件的影响;而且观测时间可以延续很长,所以,近年来这种观测技术获得
Introduction The use of photoelastic strain gauges to study rock pressure is the latest development in photoelastic experimentation. The main difference between this and photoelastic model experiments is that in the new method, a transparent artificial birefringent material is made into photoelastic strain Paste the rock (or pillars) directly on the rock (or pillar) stress distribution and size; or make photoelastic elements to produce a variety of rock pressure and movement instruments, rather than performing in-house model tests. Because the photoelastic strain gauge can directly measure the stress direction and size of the measured object, its function is equivalent to countless small resistance strain gauges, which can be used for static and dynamic measurement. It can work on the stress state of rock, metal, concrete and wood The observation is not affected by the surface shape of the object and the atmospheric conditions downhole. Moreover, the observation time can be extended for a long time. Therefore, this observation technique has been obtained in recent years