【摘要】 中国的钻孔应力相对观测是在李四光的倡导下开始的,目的是探索地震预报的途径。早期的钻孔应力观测(电感法)试图直接观测应力变化,在与弹性力学理论的结合上存在矛盾,即理论上需要观测的是位移,实际上用的压磁传感器是观测力的。1977年,在理论和实践方面发生的变革,为后来四分量应变观测的进一步发展奠定了基础。在人们努力协调传感器与观测原理的矛盾的过程中,应力仪和应变仪的概念发生了混淆。地应力不能测量的观点是没有根据的。更多还原

【Abstract】 The practice of continuously monitoring ground stress with the purpose to forecast earthquakes in China was initially led by Li Siguang.The early observation using piezomagnetic sensors attempted to measure stress directly.It had a basic disagreement in design from the viewpoint of elastic theory: piezomagnetic sensors measure force but displacement.Revolution took place both in theory and practice in 1977,which had paved the way for the so-called 4-component borehole strainmeter to take over.However,mistakes have happened from time to time about this type of observation during the whole progress.The saying that stress can not be measured is groundless.更多还原