岩体变形的原位观测,是地下洞室、边坡等岩石工程稳定监测的重要手段。一般认为,变形观测能够比较直观地反映岩石力学性态的变化规律,资料分析也比较容易,因而是一种最简单、最有效、使用最广泛的方法。目前在变形观测中比较常用的仪器是多点伸长计,它可以量测不同深度岩体的绝对和相对位移,量 In situ observation of deformation of rock mass is an important means for stable monitoring of underground cavern, slope and other rock engineering. It is generally believed that deformation observation can reflect the variation law of rock mechanical properties more intuitively and data analysis is also easier. Therefore, it is the simplest, most effective and most widely used method. At present, the most commonly used instrument in deformation observation is the multi-point extensometer, which can measure the absolute and relative displacement of rock mass at different depths,