碳酸盐岩的声波特性研究及其应用

基于岩溶地区碳酸盐岩试样室内声波测试分析发现:(1)泥质灰岩和角砾状灰岩的波速比普通灰岩、灰质白云岩比一般白云岩和角砾白云岩的高.(2)灰岩的声波、密度略大于白云岩的声波、密度,灰岩的动弹性模量、剪切模量和体积模量也比白云岩大.(3)溶蚀程度和微小结构面对碳酸盐岩中波的传播速度影响较大,灰岩波速随风化程度的提高而降低.(4)纵、横波速与岩石的密度具有线性关系,利用密度、波速、纵横波速比或泊松比可初步判断碳酸盐岩在岩性上的差别.(5)声波测试和单轴抗压强度试验求得的岩石的弹性模量具有一定的相关性,利用声波测试结果可以推求实际工程中计算、设计所需的力学参数.

STUDY AND APPLICATION OF SONIC WAVE PROPERTIES OF CARBONATE ROCK

Sonic wave measuring of carbonate rock in karst area are taken in laboratory,and the research shows that the wave speed of marlite and brecciola is higher than that of common limestone,and the wave speed of middle degree weathering limestone is higher than that of strong degree weathering limestone.The wave speed of calcareous dolomite is higher than that of common dolomite and conglomerate dolomite.The degree of corrosion and minuteness structural plane affect the wave speed of carbonate rock.The density of limestone is bigger than that of dolomite,and the wave speed of limestone is bigger than dolomite.The dynamic modulus of elasticity,shear modulus and bulk modulus of limestone are bigger than that of dolomite.There is linear relationship between the density of carbonate rock and the longitudinal or rotational wave.Lithologic difference of carbonate rock can be judged with density,wave speed,longitudinal and rotational wave speed ratio or Poisson's ratio.The relationship between dynamic and static modulus of elasticity is introduced in light of sonic wave measuring and mechanical testing.The mechanical parameters for calculating and designing of engineering can be derived from this relationship.