STUDY ON WAVE VELOCITY AND ATTENUATION OF ROCK MASS IN 2D STRESSES FIELD
二维应力场作用下岩体弹性波速与衰减特性研究

The results of elastic wave velocity from site testing of engineering rock masses indicated that elastic wave propagation velocity was influenced by stresses field.In order to study the stresses influence to velocity and attenuation of rock masses,the wave velocity and attenuation properties of rock masses in 2D stresses field were theoretically researched;and the theoretical relationships between elastic wave velocity and attenuation and stresses in jointed rock mass suffering 2D stresses field were proposed.At first,based on the deformation analysis of joints in rock mass under 2D loading,the volume changes of jointed rock mass was derived.Then according to the relationship between wave velocity and volume changes of jointed rock masses,an equivalent model analyzing the propagation of elastic wave in jointed rock mass was developed.The calculating formula of elastic wave velocity and attenuation of rock masses in 2D stresses field were proposed by using the equivalent analyzing model of the elastic wave propagation in jointed rock masses.In order to check the theoretical model and calculating formulae,an experimental research was performed on the samples of gypsum include cracks in the laboratory.The experimental results show that the elastic wave velocity and attenuation change distinctly with stresses in jointed rock mass in 2D uniform stresses field;and the testing results agree well with the theoretical model prediction.