An experimental study on variation of b value during deformation of rock samples with different structural models

Introduction Analyses of the b value in the frequency-magnitude relation (Gutenberg & Richter curve, G-R curve), lgN=a?bM, is one of important methods for earthquake prediction. It is often used to study the state of tectonic deformation and regional stress field. Many studies on the b value have been made in aspects of seismicity, experimental modeling (acoustic emission) and theory (Mogi, 1962; Scholz, 1968; LI et al, 1978; MA, 1978; CHEN, 1977; GENG, 1986; DU and MA, 1986; CAI et…     

国外矿区测震系统

在地下采矿作业中,顶板冒落与岩石突出(roof fau and rock burst)是造成人员与设备损失的主要灾害之一。随着经济建设的发展,采空区扩大,采掘深度增加,这个问题必然会日益严重。因此,预测预报冒落与岩石突出是一个迫在眉睫的课题。 冒落与突出局部应力超过岩石强度时导致岩体内部的裂隙雪崩式失稳扩展的结果,伴随有非常复杂的各种物理现象,对它们的预测有很多种手段可供使用。自从七十年代以来,世界上一些发达国家在矿山生产中广泛开展了利用高频、宽动态测震系统预报顶板冒落与岩石突出的研究。