论文部分内容阅读
地球科学的研究对象之一是岩石。无论是地下能源的开发或是岩体稳定性评价及失稳预报等问题,都需要探测地下岩体的物理性质和状态变化。迄今为止,人们在地球上所能钻探的最深钻井只有十公里左右。因此,直接探测方法的能力是有限的。在间接探测方法中,应用最广的是声学方法,约占60％(见图1)。声学方法的优点是:①与其它形式的能量相比,声的弹性波容易传播并接收,可以快速监测和扩大测试范围。②声波的传播直接反映了岩石结构的变化,它受外界的干扰较小。研究岩石物理性质的声学方法分两类,如图2所示:
One of the objects of earth science research is rock. Whether it is the development of underground energy sources or the evaluation of rock stability and instability prediction, it is necessary to detect changes in the physical properties and state of the underground rock mass. So far, the deepest drilling that people can drill on the earth is only about ten kilometers. Therefore, the ability to directly detect the method is limited. Among the indirect detection methods, the most widely used is the acoustic method, which accounts for about 60% (see Figure 1). The advantages of the acoustic method are: 1 Compared with other forms of energy, the elastic wave of sound is easily transmitted and received, and the test range can be quickly monitored and expanded. 2 The propagation of sound waves directly reflects the changes in the rock structure, which is less affected by the outside world. There are two types of acoustic methods for studying rock physical properties, as shown in Figure 2: