Determination method for safe excitation parameter of explosive epicenter
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A technology for excitation parameters and explosive sources, which is applied in the field of geophysical exploration and can solve problems such as increased construction difficulty and complex terrain conditions.
Active Publication Date: 2016-06-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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In these areas, more constraints are encountered when using explosive sources to excite seismic w
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example 1
[0037] Example 1: Method for determining safe excitation parameters of three-layer soil medium structure:
[0038] Step 1: From the analysis of single-hole static penetration and geotechnical identification maps in the target area, it can be known (such as figure 2 ), there are two main types of soil within the range of 0-30m at this point: silt (and silt clay) and silt. The silt can be subdivided into three types: silt, silty clay, and silt and silty clay layer.
[0039] According to the static penetration test results, the rock and soil 30m thick from the ground are divided into three layers.
[0040] For the soil medium of the three layers, the density is detected by the ring knife method;
[0041] use the formula Determine the wave velocity of each layer of media, where the elastic modulus E can be queried using the material library.
[0042] Step 2: According to the "Blasting Safety Regulations" (6722-2014), the attenuation coefficient of the soil layer is: k=250-35...
example 2
[0055] Example 2: Determination method of safety excitation parameters of five-layer soil medium structure:
[0056] Step 1: Single-hole static penetration testing and rock-soil identification in the target area. The silt can be subdivided into three types: silt, silty clay, and silt and silty clay layers.
[0057] According to the results of static penetration testing, the rock and soil 30m thick from the ground are divided into 5 layers.
[0058] For the soil medium of the three layers, the density is detected by the ring knife method;
[0059] use the formula Determine the wave velocity of each layer of media, where the elastic modulus E can be queried using the material library.
[0060] Step 2: According to the "Blasting Safety Regulations" (6722-2014), the attenuation coefficient of the soil layer is: k=250-350, α=1.8-2.0, and the coefficient with the smallest attenuation is selected, that is, k=350, α=2.0 .
[0061] According to the "Blasting Safety Regulations" (6...
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Abstract
The invention provides a determination method for a safe excitation parameter of an explosive epicenter. The method comprises that (a) a near land surface investigation method is used to delimit a rock layered position of a surface layer preliminarily; (b) aimed at a main protection object, a safe small dose is selected for trial shot, and a maximal vibration speed value is extracted; (c) a vibration attenuation parameter inversion matrix of the stratum is established according to the rock position of the surface layer, positional relation between a trial shot point and a vibration monitoring point and the monitored and extracted maximal vibration speed; (d) the vibration attenuation parameter inversion matrix in the step (c) is solved to obtain vibration attenuation relations among the surface layers; and (e) according to a safe vibration threshold and the vibration attenuation relations of the surface layers, the better safe excitation parameter is determined. The determination method for the safe excitation parameter of the explosive epicenter is high in speed, wide in application range, low in cost, easy to realize and effective.
Description
technical field [0001] The invention relates to the field of geophysical exploration, and more particularly relates to a method for determining safe excitation parameters of an explosive seismic source. Background technique [0002] There are many methods of geophysical prospecting, such as seismic prospecting, electromagnetic prospecting, gravity prospecting and so on. Seismic prospecting is the most widely used prospecting method at present. Compared with other prospecting methods, seismic prospecting has the advantages of high precision, high resolution, and large detection depth. [0003] Seismic exploration firstly needs artificial methods to excite seismic waves, and the effect of exciting seismic waves is very important, which directly affects the imaging depth and precision of seismic exploration. At present, the excitation sources of seismic waves can be divided into two types: explosive sources and non-explosive sources, and the principles are roughly the same. T...
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