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Characteristics and mechanisms of strain waves generated in rock by cylindrical explosive charges

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Journal of Central South University 2016年第11期23卷 2951-2957页

作者：刘科伟李萧翰李夕兵姚志华舒宗宪袁明华 School of Resources and Safety Engineering Central South University Yuxi Mining Co. Ltd. Yunnan Copper Industry (Group) Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines Central South University

A superposing principle, by suitably adding the strain waves from a number of concentrated explosive charges to approximate the waves generated by a cylindrical charge based on the strain wave of a point or small spherical explosive charge generated in rock, is used to further study the triggering time of strain gauges installed in radial direction at same distances but different positions surrounding a cylindrical explosive charge in rock. The duration of the first compression phase and peak value of strain wave, and furthermore, their differences are analyzed and some explanations are given. Besides that, the gauge orientation in which the maximum peak value occurs is also discussed. At last, the effect of velocity of detonation(V.O.D.) of a cylindrical explosive charge on the strain waves generated in the surrounding rock is taken as key research and the pattern of peak amplitude of a strain wave varies with the V.O.D. is likely to have been found.

关键词： cylindrical explosive charge strain wave concentrated explosive charge elemental strain wave superposing principle velocity of detonation(V O D ) velocity of propagation(V O P )

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Finite Dimension of Global Attractor of Nonlinear strain waves in Elastic waveguides

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Communications in Nonlinear Science and Numerical Simulation 1998年第3期3卷 173-176页

作者： Dacai MA and Murong JIANG(Department of Mathematics, Shangrao Teacher’s College, Shangrao 334000,China)(Department of Mathematics, Yunnan University, Kunming 650091, China)E-mail: jemail@*** Department of Mathematics Shangrao Teacher's College Shangrao 334000 China Department of Mathematics Yunnan University Kunming 650091 China

Consider herein are the finite dimension of global attractor of nonlinearstrain waves in elastic waveguides. By constructing two appropriate bounded coerciveguadratic forms and analysis of evolution of volume in E1 sp... 详细信息

关键词： strain wave attractor Hausdorff and fractal dimensions

Tidal wave anomalies of geoelectrical field before remote earthquakes

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Acta Seismologica Sinica(English Edition) 2007年第1期20卷 51-62页

作者：张学民翟彦忠郭学增郭建芳 Institute of Geology China Earthquake Administration Beijing 100029 China Earthquake Administration of Hebei Province Shijiazhuang 050021 China

In this paper, geoelectrical field anomalies at Changli and Xingji station in Hebei Province were analyzed before five remote earthquakes. It was found that the anomalies mainly occurred two or three months before earthquakes, which is of importance to short-term and impendent earthquake prediction. There exhibited different characteristics in geoelectrical field anomalies, but they were closely related to tidal waves, for example, the increasing in ampli- tude at semidiurnal and semimonthly periods of tidal waves; the decreasing or disappearing in amplitude of tidal waves that should have been recorded normally at that time; while there accompanied incremental signals with high frequency, such as jump variations. It was thought that the formation mechanism of the geoelectrical anoma- lies before strong earthquakes resulted from stress-strain resonance effects when rock was weakened during the preparation process in seismic area, and then signals of electric field propagated to remote stations in free space or crust, and superposed on the geoelectric field tidal waves recorded at the stations, leading to increasing or decreasing in amplitude of geoelectrical tidal waves. The high frequency signals may be related to the variation of rock porosity, permeability and so on beneath the stations, as a result of the dynamic effects of remote earthquakes.

关键词： geoelectrical field geoelectrical tidal waves semidiurnal period strain wave imminent seismic prediction

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The Latest Study of Gravitational wave Communication System

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Journal of Earth Science and Engineering 2016年第3期6卷 164-176页

作者： Yoshinari Minami Advanced Science-Technology Research Organization (Formerly NEC Space Development Division) 35-13 Higashikubo-ChoNishi-Ku Yokohama 220-0062 Japan

Gravitational wave is a strain wave of space and this can be also generated by strong magnetic field. The principle of gravitational wave generation using the fluctuation in strain field induced by magnetic field is introduced. Using both foregoing gravitational wave generator and gravitational wave detector （i.e. laser interferometric gravitational wave antenna）, the gravitational communication system can be possible. This paper introduces its content presented at 20th Annual Lecture （1989） and the research trends in the latest gravitational wave.

关键词： Gravitational wave space-time continuum space strain strain wave curvature gravitational wave communication.magnetic field.