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Discrimination method of impact range of rock mass excavation blasting based on p-wave pulse rise time

A technology of influence range and discrimination method, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc., can solve the problems of uncertainty and influence on the reliability of sound wave speed, and achieve the effect of reducing influence and improving accuracy

Active Publication Date: 2016-01-13
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the test, since the sound wave must first pass through the coupling agent when propagating, that is, the actual travel distance S of the sound wave is equal to the distance S that the sound wave propagates in the rock mass r The distance S traveled by sound waves in water w sum, since S w The unavoidability and uncertainty of , will affect the reliability of the measured sound wave velocity

Method used

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  • Discrimination method of impact range of rock mass excavation blasting based on p-wave pulse rise time
  • Discrimination method of impact range of rock mass excavation blasting based on p-wave pulse rise time
  • Discrimination method of impact range of rock mass excavation blasting based on p-wave pulse rise time

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: Single-hole sonic test

[0026] Carry out following steps successively according to the present invention:

[0027] Step 1: Carry out on-site rock mass testing and collect waveform data

[0028] 1) Connect the transducer to the acoustic wave collection device, and place the transducer at the bottom of the detection hole;

[0029] 2) Inject water into the detection hole until water flows out from the hole, then close the water injection valve of the hole to keep water flowing out from the hole;

[0030] 3) When the waveform is stable, collect the waveform and save the data;

[0031] 4) Move the transducer 20cm to the next detection position;

[0032] 5) Repeat the above steps to complete the whole testing process of a measuring hole.

[0033] Step 2: Determine the P wave and read the P wave rise time

[0034] 1) Run the corresponding sound wave detection and processing software;

[0035] 2) Call out the acoustic wave data file at a certain depth of a cer...

Embodiment 2

[0043] Example 2: Trans-hole acoustic wave test

[0044] Carry out following steps successively according to the present invention:

[0045] Step 1: Carry out on-site rock mass acoustic testing and collect waveform data

[0046]1) Connect the transducer and the sound wave acquisition equipment, respectively place the transmitting transducer and the receiving transducer at the same depth at the bottom of the two detection holes;

[0047] 2) Inject water into the detection hole until water flows out from the hole, then close the water injection valve of the hole to keep water flowing out from the hole;

[0048] 3) When the waveform is stable, collect the waveform and save the data;

[0049] 4) Simultaneously move the transmitting transducer and receiving transducer 20cm upwards to the next detection position;

[0050] 5) Repeat the above steps to complete the whole testing process of a measuring hole.

[0051] Step 2: Determine the P wave and read the P wave rise time

[00...

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Abstract

A method for discriminating the range of impact of rock mass excavation and blasting based on the rise time of P wave pulses, comprising the following steps: (1) carrying out on-site rock mass sound wave testing and collecting waveform data; (2) distinguishing and determining the P wave; (3) reading the rise time of the P wave; (4) Distinguishing the impact range of blasting. The advantage is that due to the elastic properties of the water medium, after the P wave propagates through the water medium, the rise time of the P wave is basically not affected by the water coupling distance between the sensor and the detection hole wall. Therefore, compared with the rock mass excavation and blasting influence range discrimination method based on the sound wave velocity, the discrimination method based on the P wave pulse time can effectively reduce the influence of the water coupling distance between the sensor and the hole wall on the test results and improve the accuracy of the test results. accuracy.

Description

technical field [0001] The invention relates to the technical fields of water conservancy and hydropower and geotechnical engineering, in particular to a method for discriminating the impact range of rock mass excavation and blasting based on the rise time of P wave pulses. Background technique [0002] During the blasting and excavation of rock mass, due to the effect of blast load, dynamic damage to the retained rock mass will inevitably occur while the rock blasting is completed; at the same time, with the formation of a new free surface, the physical and mechanical properties of the rock mass will be preserved. Disturbance and deterioration occur, forming so-called excavation disturbance zones or excavation damage zones. The excavation disturbance area or excavation damage area will have adverse effects on the safety of the preserved rock mass and engineering buildings. Reasonably and accurately judging the impact range of rock mass excavation and blasting, and judging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/07
Inventor 卢文波张玉柱宁淑元严鹏陈明周创兵
Owner WUHAN UNIV