CN111457803A - Underground space model circulating blasting test pre-buried blast hole and manufacturing method - Google Patents

Abstract

The invention provides a pre-embedded blast hole for a cyclic blasting test of an underground space model and a manufacturing method. The pre-embedded blast hole specifically includes a cylindrical blast hole and a plurality of cylindrical blast holes arranged symmetrically along the radial center of the cylindrical blast holes and aligned with the cylindrical blast holes. The outer edge of the cylindrical blast hole is fixedly connected to the wing plate; also includes a sealing aluminum plate arranged at the bottom of the pre-embedded blast hole, and the projection of the cylindrical blast hole along the vertical direction is located in the sealing aluminum plate; It also includes a thin tape that is arranged at the top opening of the pre-embedded blast hole. The application of the technical solution can reduce the test error.

Description

A kind of underground space model cyclic blasting test pre-embedded blast hole and manufacturing method

technical field

The invention relates to the technical field of underground space model blasting test, in particular to a pre-buried blast hole for a cyclic blasting test of an underground space model and a manufacturing method.

Background technique

The blasting mechanics model test is carried out through the underground space model test. The cyclic blasting test is to simulate the cyclic blasting test using a non-explosive charge coil device in the blasting hole of the tunnel face, and then discuss the influence of the cyclic blasting on the underground tunnel.

Disadvantages of the existing cyclic blasting test:

(1) Without the protection of pre-embedded blasting holes, the blasting test is likely to lead to the collapse of the tunnel face and the collapse of the existing blasting holes, resulting in fewer cyclic blasting, and the test cannot obtain the effect of blasting seismic waves and other factors on the surrounding rock. series of influences.

(2) Manually dig the blasting hole as the blasting cavity. With the progress of the blasting test, the blasting cavity continues to expand, resulting in the continuous increase of the gap between the blasting cavity and the explosive, and the size of the blasting hole changes. It is necessary to manually cut the blasting hole many times, which is troublesome to operate. , resulting in a change in the position of the explosion source and the embedded sensor, which has a large experimental error.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a pre-buried blast hole for a cyclic blasting test of an underground space model and a manufacturing method, which are conducive to reducing the measurement error of the underground model test, and can greatly save the blasting test operation time. .

In order to solve the above technical problems, the present invention provides a pre-embedded blast hole for a cyclic blasting test of an underground space model, the pre-embedded blast hole specifically includes a cylindrical blast hole and a plurality of symmetrical along the radial center of the cylindrical blast hole A wing plate arranged and fixedly connected with the outer edge of the cylindrical blast hole; also includes a sealing aluminum plate arranged at the bottom of the pre-embedded blast hole, the projection of the cylindrical blast hole along the vertical direction is located in the sealing Inside the aluminum plate; also includes a thin tape paper arranged at the top opening of the pre-embedded blasthole.

In a preferred embodiment, the wings are arranged at an interval of 120°.

In a preferred embodiment, the sealing aluminum plate is a square sealing aluminum plate with a thickness of 0.5 mm.

In a preferred embodiment, the cylindrical blast hole is formed by welding a thin aluminum plate with a thickness of 0.2 mm.

In a preferred embodiment, the thickness of the wing plate is 0.5mm.

In a preferred embodiment, the wing plate is a rectangular wing plate.

The invention also provides a method for making a pre-buried blast hole for a cyclic blasting test of an underground space model, comprising the following steps:

(1) The blast hole is made of a thin aluminum plate and welded into a cylindrical blast hole;

(2) Welded and sealed aluminum plate at the bottom of the cylindrical blasthole;

(3) Weld three wings at 120° intervals on the outer edge of the cylindrical blasthole;

(4) The installation and use steps of the blasthole: accurately locate the position of the blasthole in the model body, pre-embed the blasthole and the wing plate in the rock mass, and seal the opening side of the blasthole with thin tape to prevent the material from being poured into the blasthole during the pouring process. in the hole;

Before using the blast hole, pierce the tape on the open side of the blast hole and insert the non-explosive cartridge device for blasting.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The invention provides a pre-embedded blast hole for a cyclic blasting test of an underground space model and a manufacturing method. The overhanging wing plate and the square sealing aluminum plate are embedded in the model to ensure that the blast hole does not deviate during the casting and blasting of the model; the pouring process The two sides of the pre-buried blasthole are blocked to prevent the material from being poured into the blasthole during the pouring process. The wall thickness of the pre-embedded blasthole is relatively thin, and the explosion energy is almost not attenuated, which ensures the blasting test effect of the surrounding rock near the tunnel face. During the cyclic blasting test, the blasthole can be recycled, which is easy to operate, safe and reliable. Ensure that the size of the blasthole remains unchanged, the gap between the non-explosive charge coil device and the embedded blasthole remains unchanged, and the distance between the blast source and the embedded sensor is fixed, reducing the measurement error of the model test.

Description of drawings

Fig. 1 is the front view of underground space model cyclic blasting test embedded blast hole in the preferred embodiment of the present invention;

FIG. 2 is a top view of a pre-buried blast hole for a cyclic blasting test of an underground space model in a preferred embodiment of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

An underground space model cyclic blasting test pre-embedded blast hole, with reference to Figures 1 to 2, the pre-embedded blast hole specifically comprises a cylindrical blast hole 1 and a plurality of symmetrically arranged along the radial center of the cylindrical blast hole 1 and The wing plate 2 that is fixedly connected with the outer edge of the cylindrical blast hole 1; also includes a sealing aluminum plate 3 arranged at the bottom of the pre-embedded blast hole, and the projection of the cylindrical blast hole 1 along the vertical direction is located at the In the sealing aluminum plate 3; also includes a thin tape paper disposed at the top opening of the pre-embedded blast hole. Specifically, there are three wings 2 , that is, the wings 2 are arranged at an interval of 120°. In this embodiment, the sealing aluminum plate 3 is a square sealing aluminum plate 3 with a thickness of 0.5 mm. The cylindrical blast hole 1 is formed by welding a thin aluminum plate with a thickness of 0.2 mm. The thickness of the wing plate 2 is 0.5 mm.

A method for making a pre-buried blasthole for a cyclic blasting test of an underground space model, comprising the following steps:

(1) For the blast hole, a thin aluminum plate with a thickness of 0.2mm is welded into a cylindrical blast hole 1, with a diameter of 2.0cm and a height of 10cm; this size can be adjusted according to the specific requirements of the test; the wall thickness of the pre-embedded blast hole is thin, and the explosion energy is almost not attenuated , to ensure the blasting test effect of surrounding rock near the face;

(2) Three pieces of 0.5mm thick wing plates 2 are welded at 120° intervals between the outer edges of the cylindrical blasthole 1. The wing plates 2 are rectangular, the length of the wing plates 2 is the same 8cm, and the width of the wing plates 2 is 5cm. The wing plate 2 is embedded in the model to ensure that the blasthole will not be laterally offset and damaged during the model casting and blasting test; the bottom hole of the blasthole is welded with a 0.5mm thick square sealing aluminum plate 3, and the side length of the aluminum plate is 4cm; the sealing aluminum plate 3 Embedded in the model to ensure that the blasthole will not be vertically offset and damaged during the model pouring and blasting test;

(3) The installation and use steps of the blasthole: accurately locate the position of the blasthole in the model body, pre-embed the blasthole and the wing plate 2 in the rock mass, and seal the opening side of the blasthole with thin tape to prevent the material from pouring in during the pouring process. In the blast hole; before using the blast hole, pierce the tape on the opening side of the blast hole, and insert the non-explosive charge roll device for blasting.

The invention provides an underground space model cyclic blasting test pre-embedded blast hole and a manufacturing method. The outrigger wing plate 2 and the square sealing aluminum plate 3 are embedded in the model to ensure that the blast hole does not deviate during the casting and blasting process of the model; During the pouring process, both sides of the pre-buried blasthole are blocked to prevent the material from being poured into the blasthole during the pouring process. The wall thickness of the pre-embedded blasthole is relatively thin, and the explosion energy is almost not attenuated, which ensures the blasting test effect of the surrounding rock near the tunnel face. During the cyclic blasting test, the blasthole can be recycled, which is easy to operate, safe and reliable. Ensure that the size of the blasthole remains unchanged, the gap between the non-explosive charge coil device and the embedded blasthole remains unchanged, and the distance between the blast source and the embedded sensor is fixed, reducing the measurement error of the model test.

The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited to this. Insubstantial changes are acts that infringe the protection scope of the present invention.

Claims (7)

1. an underground space model cyclic blasting test pre-embedded blast hole is characterized in that described pre-embedded blast hole specifically comprises cylindrical blast hole and a plurality of symmetrically arranged along the radial center of described cylindrical blast hole and with the described cylindrical blast hole. A wing plate fixedly connected to the outer edge of the cylindrical blast hole; further comprising a sealing aluminum plate arranged at the bottom of the pre-embedded blast hole, the projection of the cylindrical blast hole along the vertical direction is located in the sealing aluminum plate; further comprising Tissue tape placed at the top opening of the pre-embedded blasthole. 2 . The underground space model cyclic blasting test pre-embedded blasthole according to claim 1 , wherein the wings are arranged at intervals of 120°. 3 . 3. The underground space model cyclic blasting test pre-embedded blasthole according to claim 1, wherein the sealing aluminum plate is specifically a square sealing aluminum plate with a thickness of 0.5 mm. 4. The underground space model cyclic blasting test pre-embedded blast hole according to claim 1, wherein the cylindrical blast hole is formed by welding a thin aluminum plate with a thickness of 0.2 mm. 5. The underground space model cyclic blasting test pre-embedded blasthole according to claim 1, wherein the thickness of the wing plate is 0.5mm. 6 . The underground space model cyclic blasting test pre-embedded blasthole according to claim 1 , wherein the wing plate is a rectangular wing plate. 7 . 7. an underground space model cyclic blasting test pre-buried blast hole making method is characterized in that employing the underground space model cyclic blasting test pre-buried blast hole described in any one of the above claims 1 to 6, comprising the following steps: (1) The blast hole is made of a thin aluminum plate and welded into a cylindrical blast hole; (2) Welded and sealed aluminum plate at the bottom of the cylindrical blasthole; (3) Weld three wings at 120° intervals on the outer edge of the cylindrical blasthole; (4) The installation and use steps of the blasthole: accurately locate the position of the blasthole in the model body, pre-embed the blasthole and the wing plate in the rock mass, and seal the opening side of the blasthole with thin tape to prevent the material from being poured into the blasthole during the pouring process. in the hole; Before using the blast hole, pierce the tape on the open side of the blast hole and insert the non-explosive cartridge device for blasting.

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