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将济南辉长岩岩柱沿不同角度锯开,再用环氧树脂粘接后加工成标准园柱形样品以模拟愈合断层。将样品置放在单轴压机下加压,使愈合断层再破裂。实验表明:愈合断层再破裂的前兆变形、破裂前的声发射率变化规律和声发射b值变化规律在某些条件下类似于完整岩石的破裂,而在某些条件下又类似于既存断层的错动。断层面与主压应力的交角以及断层愈合程度是影响愈合断层再破裂的前兆特征的主要因素。本文还指出,在地震活动性的研究中,地震断层在一定程度上愈合后再发生破裂这一问题是不容忽视的重要问题。
The Jinan gabbro rock columns were sawed at different angles and then bonded with epoxy to form standard cylindrical samples to simulate healing faults. The sample is placed under pressure in a uniaxial press to re-rupture the healing fracture. Experiments show that the variation of acoustic emissivity and acoustic b emission before rupture are similar to the rupture of intact rocks under some conditions and similar to the existing faults under some conditions Wrong. The angle between the fault plane and the principal compressive stress and the degree of fault healing are the main factors affecting the precursor characteristics of the recalcitrated fault. This paper also points out that in the study of seismicity, the problem of rupture after earthquake fault healing to some extent is an important issue which can not be ignored.