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Blast vibration safety judgment method considering crustal stress transient unloading

A transient unloading and blasting vibration technology, applied in special data processing applications, measuring devices, instruments, etc., can solve the problems of inaccurate safety assessment, can not well reflect the broadband characteristics of seismic waves, and achieve a wide range of frequency distribution. , the evaluation results are accurate and reliable, accurate and reliable vibration safety effect

Inactive Publication Date: 2017-06-20
CHINA THREE GORGES UNIV
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a blasting vibration safety judging method considering the transient unloading of ground stress, which can solve the problem of using the "Blasting Safety Regulations" GB6722-2014 in a high ground stress environment, which cannot well reflect the blasting load and ground stress. The broadband characteristics of seismic waves generated by the coupling of two excitation sources during stress transient unloading and the problem of inaccurate safety assessment can more accurately and reliably evaluate the safety of blasting vibration

Method used

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  • Blast vibration safety judgment method considering crustal stress transient unloading
  • Blast vibration safety judgment method considering crustal stress transient unloading
  • Blast vibration safety judgment method considering crustal stress transient unloading

Examples

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Embodiment 1

[0054] Engineering background: In a certain area, with the characteristics of large buried depth and high ground stress, a circular hydraulic tunnel A is excavated, and there is a completed hydraulic tunnel B near the excavated tunnel. A and B tunnels are in the At the same elevation, the parallel spacing is 50m, the tunnel radius is R=10m, and the initial ground stress around the tunnel is P 0 = 30MPa.

[0055] A method for judging the safety of blasting vibration considering the transient unloading of ground stress, comprising the following steps:

[0056] Step 1: Drill and charge at the face of tunnel A, using 8-stage delay detonators (MS1(0ms), MS3(50ms), MS5(110ms), MS7(200ms), MS9(310ms), MS11(460ms), MS13 (650ms) and MS15 (880ms)) are used as the detonation source, the aperture of the main blast hole is 90mm, the hole depth is 900cm, the hole distance is 240cm, the row distance is 200cm, and the length of the plugging section is 250cm. The φ60 or φ70mm charge rolls ar...

Embodiment 2

[0090] Figure 7 In the drilling and blasting excavation process of tunnel A, the number of surrounding rock vibration damage parts obtained by actual observation and the results of the surrounding rock safety evaluation using the existing evaluation means and the method of the present invention are respectively obtained, from Figure 7 It can be seen from the figure that compared with the existing blasting vibration safety criterion, the evaluation result is closer to the measured data and the evaluation accuracy is higher by adopting the blasting vibration safety criterion considering the transient unloading of ground stress provided by the invention.

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Abstract

The invention relates to a blast vibration safety judgment method considering crustal stress transient unloading. The blast vibration safety judgment method includes the steps that 1, a vibration meter is used for carrying out vibration monitoring on an excavated tunnel body and surrounding buildings to obtain actual measurement surrounding rock vibration signals; 2, the actual measurement vibration peak value PPV1 is obtained; 3, blast load (BL) and crustal stress transient unloading (IS) are recognized; 4, vibration amplitudes caused by two excitation source coupling action, crustal stress transient unloading and blast load, corresponding main vibration frequency and frequency demarcation point of blast high-frequency waves and transient low-frequency waves are obtained respectively; 5, the transient vibration peak value PPV2 and the blast vibration peak value PPV3 are obtained; 6, blast vibration safety allowable values [PPV1], [PPV2] and [PPV3] corresponding to the coupling vibration main frequency f1, the transient main frequency f2 and the blast main frequency f3 are selected; 7, the coupling vibration peak value PPV1 and the coupling safety allowable value [PPV1], the crustal stress transient vibration peak value PPV2 and the transient safety allowable value [PPV2] as well as the blast vibration peak value PPV3 and the blast safety allowable value [PPV3] are compared. The blast vibration safety judgment method is capable of accurately and reliably evaluating blast vibration safety.

Description

technical field [0001] The invention relates to a blasting vibration safety judging method considering the transient unloading of ground stress, and relates to the field of blasting vibration safety evaluation of surrounding rock or adjacent buildings during drilling and blasting excavation of deep rock mass. Background technique [0002] Under the background of the rapid development of my country's economic construction, the development space on the ground is seriously insufficient, and the underground space is gradually developed and utilized, such as underground workshops in the water conservancy industry, tunnel engineering in the transportation industry, nuclear waste storage in the nuclear power industry, etc., the construction of underground projects The construction is faced with unfavorable conditions such as large buried depth and high ground stress. The current rock mass excavation methods mainly include drill and blast method and mechanical (TBM) method. For the c...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01H17/00
CPCG01H17/00G06F30/20
Inventor 王奋范勇周宜红赵春菊江璐
Owner CHINA THREE GORGES UNIV
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