摘要
基于岩体在二维应力场作用下的节理变形分析,运用节理变形对岩体中节理体积率的改变,建立节理对岩体中弹性波传播影响的等效模型,从而推导节理岩体在应力场作用下的弹性波传播速度和衰减随应力的变化关系。为检验理论公式的可靠性,对2组含裂缝的石膏模型进行弹性波测试,试验测试结果表明,理论计算结果与试验结果具有较好的一致性。
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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第1期123-130,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
教育部重点科技项目(03113)
关键词
岩石力学
节理岩体
波速
衰减
rock mechanics
jointed rock mass
wave velocity
attenuation
