【摘要】 首先描述岩石的声弹理论,给出岩石的应力与弹性波波速之间的理论关系;其次利用岩石应力与弹性波波速之间的理论关系提出地应力超声测量方法,即通过测量套孔应力解除前后的孔壁超声波波速的变化,利用声弹理论反演出地应力。通过数值算例讨论地应力对孔壁超声波速的影响,其结果表明,该方法可以有效地确定地应力的大小和方向。更多还原

【Abstract】 A new method for measuring in-situ stresses with ultrasound is developed based on acoustoelasticity theory.First,acoustoelasticity theory of rock is shown,which gives the theoretical relation between the ultrasonic wave velocity and in-situ stress of rock.Second,based on the acoustoelasticity theory of rock,an ultrasound method for determining the in-situ stress of rock is presented.The velocity variation of ultrasonic waves along a borehole surface before and after overcoring is measured,based on which the in-situ stress can be back analyzed.Last,numerical example shows the influence of rock stresses on wave velocities along the borehole surface.The numerical results reveal that this method can effectively determine the magnitude and the direction of in-situ rock stresses.更多还原