阅读说明：本技术 预控顶矿房中深孔二次***方法 (Secondary blasting method for medium-length hole of pre-control roof chamber ) 是由 张纪伟 刘太亮 陈军成 于 2020-06-30 设计创作，主要内容包括：本发明涉及预控顶矿房中深孔二次爆破方法,属于爆破技术领域。本发明的目的在于提出一种预控顶矿房中深孔二次爆破方法,解决中深孔爆破大块多和震动扰民的问题。本发明包括：A、确定爆破炮孔的间距和排距；B、向预控顶矿房钻凿炮孔,并控制炮孔偏斜率；C、向炮孔内充填炸药并实施第一次爆破,其中充填深度为炮孔深度的一半；D、向剩余中深孔中充填炸药并实施第二次爆破。(The invention relates to a secondary blasting method for a deep hole in a pre-control roof chamber, belonging to the technical field of blasting. The invention aims to provide a secondary blasting method for a medium-length hole of a pre-control roof chamber, which solves the problems of large blasting blocks of the medium-length hole and disturbance to residents due to vibration. The invention comprises the following steps: A. determining the spacing and row spacing of blasting holes; B. drilling blast holes to the pre-control roof chamber, and controlling the blast hole deflection rate; C. filling explosives into the blast hole and carrying out first blasting, wherein the filling depth is half of the depth of the blast hole; D. and filling explosive into the residual medium-length hole and performing secondary blasting.)

1. A secondary blasting method for a deep hole in a pre-control roof chamber is characterized by comprising the following steps:

A. determining the spacing and row spacing of blasting holes;

B. drilling blast holes to the pre-control roof chamber, and controlling the blast hole deflection rate;

C. filling explosives into the blast hole and carrying out first blasting, wherein the filling depth is half of the depth of the blast hole;

D. and filling explosive into the residual medium-length hole and performing secondary blasting.

2. The secondary blasting method for the medium-length hole in the pre-controlled roof chamber as recited in claim 1, wherein: and D, plugging the bottom of the blast hole before filling the explosive for the second time.

3. The secondary blasting method for the medium-length hole in the pre-controlled roof chamber as recited in claim 1, wherein: the method also comprises the following steps between the steps C and D:

and (5) cleaning rock slag and waste liquid in the blast hole.

4. The secondary blasting method for the medium-length hole in the pre-controlled roof chamber as recited in claim 1, wherein: the primary blasting and the secondary blasting are initiated by using millisecond detonators.

Technical Field

The invention relates to a secondary blasting method for a deep hole in a pre-control roof chamber, belonging to the technical field of blasting.

Background

The main process of medium-length hole blasting is to convey explosives into blasting holes and then to use an initiating device to detonate to complete the operation. However, in the actual blasting process, the medium-length hole blasting is large in large blocks and the blasting vibration is large, so that the shoveling, loading and unloading efficiency is affected, and in addition, the ground vibration disturbs residents.

Disclosure of Invention

The invention aims to provide a secondary blasting method for a medium-length hole of a pre-control roof chamber, which solves the problems of large blasting blocks of the medium-length hole and disturbance to residents due to vibration.

The invention relates to a secondary blasting method for a deep hole in a pre-control roof chamber, which comprises the following steps:

A. determining the spacing and row spacing of blasting holes;

B. drilling blast holes to the pre-control roof chamber, and controlling the blast hole deflection rate;

C. filling explosives into the blast hole and carrying out first blasting, wherein the filling depth is half of the depth of the blast hole;

D. and filling explosive into the residual medium-length hole and performing secondary blasting.

Preferably, in the step D, the bottom of the blast hole is plugged before the explosive is filled for the second time.

Preferably, the following steps are further included between steps C and D:

and (5) cleaning rock slag and waste liquid in the blast hole.

Preferably, the first blasting and the second blasting are initiated by millisecond blasting caps.

The invention has the beneficial effects that: flexible operation, small blasting vibration and moderate ore-breaking lumpiness, and improves the production (shoveling and ore-discharging) efficiency.

Detailed Description

A secondary blasting method for a deep hole in a pre-control roof chamber comprises the following steps:

A. determining the spacing and row spacing of blasting holes;

B. drilling blast holes to the pre-control roof chamber, and controlling the blast hole deflection rate;

C. filling explosives into the blast hole and carrying out first blasting, wherein the filling depth is half of the depth of the blast hole;

D. and filling explosive into the residual medium-length hole and performing secondary blasting.

And D, plugging the bottom of the blast hole before filling the explosive for the second time.

Wherein, the following steps are also included between steps C and D:

and (5) cleaning rock slag and waste liquid in the blast hole.

Wherein, the first blasting and the second blasting priming detonators adopt millisecond detonators.

Of course, the foregoing is only a preferred embodiment of the invention and should not be taken as limiting the scope of the embodiments of the invention. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.