延时叠加震源对地表振动的数值仿真
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摘要
利用AUTODYN-2d程序,本文分别对1.5kg普通震源药柱和1.5kg三级延时叠加震源对地表的振动状况进行了仿真研究,并对其试验结果进行了对比分析,得到了两种震源产生的地震波在距装药底端面10m处的压力曲线、对地表振动的切向速度、切向位移以及压力等的变化曲线。研究结果表明:在合理控制各级药柱之间的距离间隔和时间间隔的情况下,延时叠加震源可获得能量向下方向的叠加,且在相同药量条件下,下传能量大于普通震源;延时叠加震源产生的对地表质点的振动切向速度和切向位移均明显小于同药量的普通震源药柱,表明延时叠加震源更适合于复杂地表区的地震勘探。
Using AUTODYN-2d program, the simulation study on vibration of surface is carried out by using 1.5kg conventional dynamite source and three-level time-delayed stack source respectively, and correlation and analysis of experimental results are carried out, which got the pressure curve that the seismic waves formed by two kinds of sources is at 10m below the changing bottom interface, the variation curves of shear velocity, displacement and pressure of surface vibration. The studied results showed that in a situation of reasonably controlling the interval of distance and time between separate levels of explosive column, the time-delayed stack source can get the stack of downgoing energy and be greater than the conventional dynamite in downgoing energy if the charge size is same; the shear velocity and displacement of vibration at surface point produced by time-delayed source are significantly less than that by conventional explosive column with same charge size, showing that the time-delayed stack source is more suitable for seismic exploration in complex surface area.
Using AUTODYN-2d program, the simulation study on vibration of surface is carried out by using 1.5kg conventional dynamite source and three-level time-delayed stack source respectively, and correlation and analysis of experimental results are carried out, which got the pressure curve that the seismic waves formed by two kinds of sources is at 10m below the changing bottom interface, the variation curves of shear velocity, displacement and pressure of surface vibration. The studied results showed that in a situation of reasonably controlling the interval of distance and time between separate levels of explosive column, the time-delayed stack source can get the stack of downgoing energy and be greater than the conventional dynamite in downgoing energy if the charge size is same; the shear velocity and displacement of vibration at surface point produced by time-delayed source are significantly less than that by conventional explosive column with same charge size, showing that the time-delayed stack source is more suitable for seismic exploration in complex surface area.
引文
[1]李庆忠.走向精确勘探的道路.北京:石油工业出版社,1995
[2]李文彬,王晓鸣,赵国志,何勇.延时叠加震源激发地震波能量的研究.爆破器材,2004(1):9~11
[3]李文彬,王晓鸣,赵国志,何勇.高分辨率地震勘探垂向叠加震源研究.南京理工大学学报,2002(1):44~47
[4]Century Dynamics Inc.Interactive Non-Linear DynamicAnalysis Soft ware Theory Manua.Century DynamicsIncorporated,2004
[2]李文彬,王晓鸣,赵国志,何勇.延时叠加震源激发地震波能量的研究.爆破器材,2004(1):9~11
[3]李文彬,王晓鸣,赵国志,何勇.高分辨率地震勘探垂向叠加震源研究.南京理工大学学报,2002(1):44~47
[4]Century Dynamics Inc.Interactive Non-Linear DynamicAnalysis Soft ware Theory Manua.Century DynamicsIncorporated,2004
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