CN111351409A - Blasting vibration reduction method - Google Patents

Abstract

The invention discloses a blasting vibration reduction method, which comprises the following steps: excavating and circularly advancing; sequentially forming cut holes, auxiliary holes and peripheral holes in the same end face; arranging a vibration detector at a certain distance from the peripheral holes; and acquiring a vibration value of the vibration detector in the blasting process to represent a blasting vibration reduction value. The blasting vibration reduction method provided by the invention comprehensively considers surrounding buildings, surrounding rock classification, supporting conditions, surrounding environment and the like, and calculates the maximum single-explosive blasting amount according to the blasting vibration safety allowable standard. On the premise of fully meeting the requirement of operation progress, on the same operation surface, the circulating footage is reduced in sequence, the single-shot explosive loading is reduced, and the blasting parameters are optimized step by step. And finally, comprehensively analyzing the economic indexes of the blasting excavation technology to obtain an optimal blasting scheme.

Description

Blasting vibration reduction method

Technical Field

The invention relates to the technical field of ore body blasting demolition, in particular to a blasting vibration reduction method.

Background

The technical problem of influence on vibration of surrounding important buildings in tunneling blasting in a to-be-blasted area is solved, and project progress and safety production requirements are guaranteed. In the prior art, the influence on surrounding important buildings in the blasting process is generally comprehensively judged on the blasting explosive quantity, the blasting distance and the engineering geological conditions, and the evaluation process is complicated, troublesome in process and poor in universality.

Disclosure of Invention

The invention aims to provide a method for reducing vibration of blasting, which at least solves part of defects in the prior art.

A further object of the present invention is to provide a method of shock absorption for blasting which is simple to operate.

Another further object of the present invention is to provide a blasting vibration reduction method with strong versatility.

Particularly, the invention provides a blasting vibration reduction method, which comprises the following steps:

excavating and circularly advancing;

sequentially forming cut holes, auxiliary holes and peripheral holes in the same end face;

arranging a vibration detector at a certain distance from the peripheral holes;

and acquiring a vibration value of the vibration detector in the blasting process to represent a blasting vibration reduction value.

Preferably, the angle of the cut holes is 65 ° to 78 °.

Preferably, the preset spacing between the cut holes prevents cross-talk.

Preferably, the circulating footage distance is 3-4 m.

Preferably, the single-shot load is reduced as the distance of the cyclic footage is reduced.

Preferably, the distance between the peripheral hole and the vibration detector is 150-200 m.

Compared with the blasting vibration reduction method in the prior art, the blasting vibration reduction method provided by the invention has the following beneficial effects:

the blasting vibration reduction method provided by the invention comprehensively considers surrounding buildings, surrounding rock classification, supporting conditions, surrounding environment and the like, and calculates the maximum single-explosive blasting amount according to the blasting vibration safety allowable standard. On the premise of fully meeting the requirement of operation progress, on the same operation surface, the circulating footage is reduced in sequence, the single-shot explosive loading is reduced, and the blasting parameters are optimized step by step. And finally, comprehensively analyzing the economic indexes of the blasting excavation technology to obtain an optimal blasting scheme.

Detailed Description

The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The blasting vibration reduction method provided by the invention is used for determining and optimizing blasting parameters so as to ensure that the rock drilling blasting parameters are reasonable, safe and efficient. The blasting vibration reduction method specifically comprises the following steps:

firstly, excavating and circularly advancing.

Specifically, the IV-grade surrounding rock adopts a full-section excavation method, and the circulating footage distance is 3-4 m. The circulating footage refers to the distance for completing the propelling of a circulating excavation working surface. One cycle means that the working face excavation is performed in a complete process starting with the excavation and ending with the excavation at a distance. In a particular embodiment, the distance of cyclic progression may be 3m, 3.2m, 3.5m, 3.7m and 4m, depending on the particular rock mass.

And secondly, sequentially forming cut holes, auxiliary holes and peripheral holes in the same end face.

And sequentially drilling the auxiliary holes and the peripheral holes of the three-stage wedge-shaped cut holes by using a rock drill with the diameter of 48mm in the same section. The distance between peripheral eyes is 50 cm; the full-section excavation ultra-depth is 0.2 m. The distance between the cut hole should be controlled during drilling, prevent to occur sympathetic explosion, control the angle and prevent the cluster hole, preferably, the drilling direction of two adjacent cut holes sets up oppositely, when the angle of inclination of one cut hole was towards north, the angle of inclination of cut hole adjacent thereto was towards the south promptly. And sequentially charging, filling, connecting, warning and detonating according to the design requirements of the scheme.

Further, the inclination angle of the cut holes is 65-78 °, specifically 65 °, 68 °, 72 °, 76 ° and 78 °.

In some preferred embodiments, the single-response charge decreases as the distance of the cyclic advancement decreases, and the fit relationship between the cyclic advancement and the single-response charge is q 0.35x, where q is the charge per well in kg; x is the distance of the cyclic footage in m.

And thirdly, arranging a vibration detector at a certain distance from the peripheral holes.

The distance between the peripheral holes and the vibration detector is 150-200 m.

And fourthly, acquiring a vibration value of the vibration detector in the blasting process.

And acquiring a vibration value of the vibration detector in the blasting process, wherein the vibration value represents a blasting vibration reduction value, and different circulation footings are used for detecting the blasting vibration value. The blasting vibration value is minimum under the same condition, and the weakest destructive power to the civil buildings of the peripheral military facilities is the optimal blasting parameter.

The blasting vibration reduction method provided by the invention comprehensively considers surrounding buildings, surrounding rock classification, supporting conditions, surrounding environment and the like, and calculates the maximum single-explosive blasting amount according to the blasting vibration safety allowable standard. On the premise of fully meeting the requirement of operation progress, on the same operation surface, the circulating footage is reduced in sequence, the single-shot explosive loading is reduced, and the blasting parameters are optimized step by step. And finally, comprehensively analyzing the economic indexes of the blasting excavation technology to obtain an optimal blasting scheme.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (6)

1. A vibration reduction method for blasting is characterized by comprising the following steps:

excavating and circularly advancing;

sequentially forming cut holes, auxiliary holes and peripheral holes in the same end face;

arranging a vibration detector at a certain distance from the peripheral holes;

and acquiring a vibration value of the vibration detector in the blasting process to represent a blasting vibration reduction value.

2. A method of damping blast vibration as defined in claim 1, wherein:

the angle of the cut hole is 65-78 degrees.

3. A method of damping blast vibration as defined in claim 2, wherein: the preset spacing between the cut holes is used for preventing hole stringing.

4. A method of damping blast vibration as defined in claim 3, wherein:

the distance of the circulating footage is 3-4 m.

5. A method of damping vibration in a blast as defined in claim 4, wherein:

the single-shot charge is reduced as the distance of the cyclic feed is reduced.

6. A method of damping blast vibration as defined in claim 1, wherein:

the distance between the peripheral holes and the vibration detector is 150-200 m.