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In-hole seismic wave based advanced prediction method

A technology of advanced forecasting and seismic wave, applied in the direction of alarms, instruments, etc., can solve the problem that the seismic wave velocity value of the formation cannot be obtained, and achieve the effect of reducing the number of drilling holes, expanding the detection radius, and reducing sampling errors

Active Publication Date: 2016-06-29
铁三院(天津)工程有限公司
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Problems solved by technology

The essence of the tube wave detection method is a means of qualitatively judging the geological conditions around the borehole by only using the shape change of the Stoneley wave in the borehole, without analyzing and utilizing other seismic wave information, it cannot obtain the borehole The seismic wave velocity values ​​of each section of the stratum within the stratum, and the stratum cannot be accurately classified according to the longitudinal wave velocity (TB10012-2007 Table 4.3.2-4). The detection results obtained can only be used as qualitative analysis, which is one-sided, so it cannot As a complete look-ahead forecasting tool

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[0061] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be noted that the embodiments are illustrative, not restrictive, and cannot limit the protection scope of the present invention.

[0062] A kind of advanced prediction method based on the seismic wave in the hole comprises the following steps:

[0063] ⑴. Keep an appropriate distance between the excitation probe and the receiving probe in the hole, and then use the push rod to push the two probes to the bottom of the borehole synchronously. In the present invention, the receiving probe can be a single-component or three-component probe. Generally, a single-component probe can meet the requirements, but a three-component probe is more conducive to abnormal identification.

[0064] ⑵. Use the water injection device to fill the hole with water, and seal the hole with a rubber stopper to prevent water from flowing out, so as to ensure the excit...

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Abstract

The invention relates to an in-hole seismic wave based advanced prediction method. The in-hole seismic wave based advanced prediction method comprises the following steps that 1, an in-hole excitation probe and a receiving probe are synchronously pushed to the bottom of a drill hole; 2, a hole is filled with water by using a water injection device and is sealed by using a rubber plug; 3, detection is performed by adopting in-hole exciting seismic waves and hole orifice exciting seismic waves; 4, data processing and interpretation and result output are performed. The in-hole seismic wave based advanced prediction method is a novel advanced prediction means, can visually and accurately detect structural anomaly within a certain range of the periphery of the hole diameter in virtue of the advantages of in-hole common-offset seismic records in a close-range mode, can obtain the rock mass characteristics of surrounding rocks in a close-range mode, can utilize the seismic records obtained through hole orifice common-source point excitation to obtain a more accurate longitudinal wave speed value, can decrease report omission phenomena during drilling, can obtain more accurate speed information compared with other advanced earthquake prediction methods and can more accurately provide advanced tunnel prediction results. The prediction results provide powerful references for construction decision makers to decide to increase the number of drill holes or not and adopt which excavation ways.

Description

technical field [0001] The invention relates to the technical field of geological prediction, in particular to an advance prediction method based on seismic waves in holes. Background technique [0002] Advanced geological prediction is a technology to prevent engineering safety accidents and ensure construction and production safety under complex geological conditions. It is based on the relevant exploration data of the rock mass where the tunnel is located, the results of physical detection, geological prediction, and drilling detection used in the construction process, and uses the corresponding geological theory and disaster occurrence laws to analyze and study these data, so as to control the construction. Forecast the conditions of the rock mass in front of the subface and the possibility of disasters, adjust the construction method in time and take corresponding technical measures to ensure the safety of construction and production. Advanced geological prediction is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/10
CPCG08B21/10
Inventor 刘振明王银郝明李志华
Owner 铁三院(天津)工程有限公司
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