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围岩松动圈可分为松散带,过渡带和原岩,这三层在波速度上存在明显的差异这为利用地震折射层析方法测试围岩松动圈提供了良好的地球物理基础。本文通过介绍地震折射层析方法的原理,松动圈现场测试时测线的布置位置,每条测线的布置方式(包括检波器和炮点的位置),测试时对炮点检波距炸药用量的要求,采集到的数据的处理流程,以及松散带、过渡带和原岩的划分方法和解释原则,用一个实例说明了地震折射层析方法如何划分松动圈范围和设计锚杆长度。证明了地震折射层析方法在围岩松动圈测试中的有效性。
The loose rings of the surrounding rock can be divided into loose belt, transition belt and original rock, which have obvious difference in wave velocity. This provides a good geophysical basis for testing the loose ring of surrounding rock by seismic refraction tomography. In this paper, the principle of seismic refraction tomography is introduced, the location of measuring line in the field test of loose ring, the arrangement of each measuring line (including the position of detector and shot) Requirements, the data processing flow and the principle of dividing and analyzing the loose belt, transition belt and original rock, an example is given to illustrate how seismic refraction tomography can divide the range of loose ring and design the length of anchor rod. It is proved that the seismic refraction tomography method is effective in the test of rocking zone of surrounding rock.