In-hole seismic wave based advanced prediction method

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 ...

AI Technical Summary

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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