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Method for determining distributed explosive source triggering parameters

A technology of explosive seismic sources and excitation parameters, which is applied in the field of geophysical exploration, can solve the problems of restricting the application of distributed seismic sources and poor excitation effects, and achieve the effects of increasing frequency, broadening seismic wave frequency band, and increasing main frequency

Active Publication Date: 2016-03-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

When the distributed seismic source parameters do not match the near-surface parameters of the exploration area, the excitation effect tends to become worse, which also limits the application of distributed seismic sources

Method used

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  • Method for determining distributed explosive source triggering parameters
  • Method for determining distributed explosive source triggering parameters
  • Method for determining distributed explosive source triggering parameters

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example 1

[0039] Example 1: Method for determining safe excitation parameters of three-layer soil medium structure:

[0040] 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.

[0041] According to the static penetration test results, the rock and soil 30m thick from the ground are divided into three layers.

[0042] For the soil medium of the three layers, the density is detected by the ring knife method;

[0043] According to the arrival time of the seismic wave and the distance between the monitoring point and the charge package, the wave velocity of each layer can be obtained (the number of monitoring points = the number of layers);

[0044] use the formula Determine the modulus o...

example 2

[0061] Example 2: Determination method of safety excitation parameters of five-layer soil medium structure:

[0062] Step 1: According to the analysis of single-hole static sounding and rock-soil identification map in the target area, there are two main types of soil within the range of 0-30m at this point: silt (and silt clay) and silt. For silt, it can be subdivided into three types: silt, silty clay, and interbedded silt and silty clay.

[0063] According to the results of static penetration testing, the rock and soil 30m thick from the ground are divided into 5 layers.

[0064] For the soil medium of the 5 layers, the density is detected by the ring knife method;

[0065] According to the arrival time of the seismic wave and the distance between the monitoring point and the charge package, the wave velocity of each layer can be obtained (the number of monitoring points = the number of layers);

[0066] use the formula Determine the modulus of elasticity of the medium; ...

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Abstract

The invention provides a method for determining distributed explosive source triggering parameters. The method comprises the steps of (a) adopting a near-surface survey method to delimit a rock-soil layer horizon of a surface layer and determining basic physical parameters; (b) performing gun testing and triggering, and monitoring and recording ground vibration; (c) according to gun testing arrangement and rock-soil layering of the earth surface, establishing a finite element model of explosion action in rock-soil of the explosive source; (d) performing comparing regression analysis by finite element model calculation and test monitoring records, and determining rock-soil dynamic deformation model parameters; (e) performing analysis comparison on initial elastic wave energy and frequency in multiple distributed explosive source triggering schemes on the basis of the established on-site rock-soil layer model, combining exploration target layer characteristics and requirements, and determining that the distribution satisfying the energy and resolution is explosive source triggering parameters. The method for determining the distributed explosive source triggering parameters, provided by the invention, is rapid in speed, wide in application scope, low in cost, simple and convenient, and easy to implement.

Description

technical field [0001] The invention relates to the field of geophysical exploration, and more particularly relates to a method for determining excitation parameters of a distributed explosive seismic source. Background technique [0002] The charge structure of the explosive source, that is, the filling form of the explosive and the spatial distribution of the charge column, determine the output form and propagation direction of the explosion energy of the explosive source. When seismic sources with different charge structures explode in rock and soil, the explosion wave will form different modes of action with the surrounding rock and soil medium, and produce different seismic effects. Over the years, based on their own research theories, combined with long-term practical experience and test results, researchers at home and abroad have designed a variety of source charge structures suitable for seismic exploration, including multi-distributed explosive sources, low detonat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/104G01V1/13
CPCG01V1/104G01V1/13
Inventor 王仲琦牟杰于成龙李建平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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