Abstract:

This article illustrates the measuring principle of deep and surface displacements of surrounding rock of roadway, analyses the disadvantages of two kinds of conventional measuring methods，proposes a new combination multi-point displacement meter which can comprehensively measure deep and surface displacement of surrounding rock, improve the measuring precision and validity ,reduce observation station, and based on this new instrument illustrates a method of measuring and calculating the deep surrounding rock separation , real displacement and the ratio of deep and surface displacement, which provides scientifical and valid data for researching the movement rule of surrounding rock and designing roadway support reasonably.

Key words: new combination multi-point displacement meter, comprehensive measurement, measuring and calculating, real deep displacement