炸药震源激发效果分析
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摘要
本文从球面波传播的基本原理出发,通过对克希霍夫积分公式的求解,分析了弹性波在传播过程中波前面的曲率半径和波场强度的关系,指出爆炸产生的空洞形状对地震波强度有影响,在某一方向上的弹性波振动振幅与等效空洞在此方向的曲率半径成正比。据此理论分析了实际工作中的炸药类型和形状,认为细长药柱和聚能激发均不能形成曲率半径较大的等效空洞,因而达不到增大激发能量的效果。为此提出合理选择炸药类型和形状的基本方法。
Starting from the basie principle of spherical wave propagation and through solving the Kirch-hoff integrated formula,the paper analyzed the re-lation between the curvature radius of spherical wave front and wave field strength during propagation of elastic wave and pointed out the influence of produced equivalent cavity form on seismic wave strength; the amplitude of elastic wave in a direction and equivalent cavity are direct propor-tional to the curvature radius in that direction. On the basis of the theory the dynamite type and form in practice has been analyzed. It is considered that using long and thin charge column and charge cluster for shooting does not form equivalent cavi-ty having larger curvature radius, so that the ef-fect of increasing explosive energy has not been achieved. Therefore ,the paper presented the basie methods for reasonable selection of dynamite type and form and made reasonable suggestion on major issues that ought to be considered.
Starting from the basie principle of spherical wave propagation and through solving the Kirch-hoff integrated formula,the paper analyzed the re-lation between the curvature radius of spherical wave front and wave field strength during propagation of elastic wave and pointed out the influence of produced equivalent cavity form on seismic wave strength; the amplitude of elastic wave in a direction and equivalent cavity are direct propor-tional to the curvature radius in that direction. On the basis of the theory the dynamite type and form in practice has been analyzed. It is considered that using long and thin charge column and charge cluster for shooting does not form equivalent cavi-ty having larger curvature radius, so that the ef-fect of increasing explosive energy has not been achieved. Therefore ,the paper presented the basie methods for reasonable selection of dynamite type and form and made reasonable suggestion on major issues that ought to be considered.
引文
[1] Sharpe J A. The production of elastic wave by explo-sion pressures, I : Theory and empirical field obser-vations. Geophysics ,1942,7(2) :144-154
[2] Nicholls H. Coupling explosive energy to rock. Geo-physics, 1962,27(3) :305-316
[3] 陆基孟等.地震勘探原理.北京:石油工业出版社,1982,334～360
[4] 钱荣钧.对地震资料野外采集工作中一些问题的讨论.地震勘探采集技术论文集,北京:石油工业出版社,1993
[5] 王卫华.纵波勘探中的炸药激发方式分析.石油地球物理勘探,1999,34(3) :249～259
[2] Nicholls H. Coupling explosive energy to rock. Geo-physics, 1962,27(3) :305-316
[3] 陆基孟等.地震勘探原理.北京:石油工业出版社,1982,334～360
[4] 钱荣钧.对地震资料野外采集工作中一些问题的讨论.地震勘探采集技术论文集,北京:石油工业出版社,1993
[5] 王卫华.纵波勘探中的炸药激发方式分析.石油地球物理勘探,1999,34(3) :249～259
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