A Correction Method for the Span in the Trans-hole Acoustic Wave Test of Rock Blasting Damage

Abstract

The invention discloses a method for correcting a span during rock blasting damage cross-hole sound wave test. The method is suitable for span correction between an emitting transducer and a receiving transducer in a sound wave hole for rock blasting digging damage sound wave monitoring in blasting digging engineering. A sample is measured through a sound wave hole before blasting to obtain coordinates A (xa, ya, za) and B (xb, yb, zb) of orifices A and B; after blasting, the orifices of the dug residual sound wave hole are cleared, and the sample is measured to obtain the coordinates A' (x'a, y'a, z'a) and B' (x'b, y'b, z'b) of the two orifices A and B; an actual distance between the emitting transducer and the receiving transducer at the moment can be precisely calculated through a formula, wherein eta=xb+(xb-x'b)tbi-xa-(xa-x'a)tai, delta=yb+(yb-y'b)tbi-ya-(ya-y'a)tai, phi=zb+(zb-z'b)tbi-za-(za-z'a)tai. According to the method, the span can be corrected only through the coordinates of the orifices of the conventional sound wave monitoring hole of the engineering before and after blasting without measuring an inclination angle and an inclination direction of the sound wave detection hole; extra workload and extra equipment are not added; the method is easy to operate, precise and reliable. The calculating formula of the span correction method provided by the invention is simple; calculation is easy, and sound wave test analysis software is easily programmed and implanted.

Description

technical field [0001] The invention belongs to the fields of water conservancy and hydropower engineering, transportation, mines, etc., and specifically relates to a method for correcting the span of a rock blasting damage cross-hole acoustic wave test, which is suitable for a transmitting transducer and a receiving transducer for rock blasting excavation damage acoustic wave monitoring The span correction between. Background technique [0002] During foundation blasting excavation in water conservancy and hydropower projects, transportation, mining and other fields, there are usually different degrees of damage to the rock mass below the foundation surface. At present, the sonic method is mainly used to conduct comparative tests before and after blasting to determine the range of blasting damage and evaluate the excavation quality of the foundation surface rock mass. The sound wave test of the blasting damage range of rock mass is a testing technique to evaluate the blast...

AI Technical Summary

Problems solved by technology

This creates a serious problem, inaccurate wave velocity calculations due to inaccurate spans can lead to completely wrong judgments

[0005] Some engineers and technicians use the method of measuring the inclination of the hole to correct the span, but the aperture of the acoustic test hole is generally small, and the diameter of the inclinometer is large, which is difficult to realize; and it is necessary to add equipment such as an electronic compass and an inclinometer. It is neither economical nor cumbersome

Moreover, under the conditions of the work site, the tendency is more difficult to accurately measure, so this method has great limitations

Images