Method of initiation of explosive charges

FIELD: blasting operations.

SUBSTANCE: the purpose of the invention is creation of an effective and trusty firing method with a controlled time delay. The substance of the invention consists that at initiation of a surface network a time delay of initiation of explosive charges between the adjoining wells define from the following ratio T<L/V, where T is a time delay, L is a line of the least resistance from the nearest blasted well to the initiated well, V - a breaking wave velocity (it defines a physical-mechanical state of the blasted medium), and initiation of the wells blasting charges is conducted by a system of a non-electric blasting with a null delay, at that for obtaining a converging detonation of the explosive charge the length of waveguides of the system of the non-electric blasting is regulated. For upgrading accuracy of initiation of a surface network it is possible to use electrical detonators with electronic delay (EDED).

EFFECT: the invention ensures an effective and trusty firing method with a controlled time delay.

2 cl, 1 dwg, 1 ex

 

The invention relates to the field of blasting operations, in particular to systems and means of blasting

Known methods of blasting using non-electric blasting systems[1], which consists in the creation of a surface of a slowdown when using pyrotechnic relay and transmission of detonation militants, therefore, discharge of industrial explosive materials (VM) detonating cord (LH).

The use of such blasting systems associated with low efficiency of explosion due to the possibility of partial burnout of charge VM by passing it the detonation of LH, as well as significant variation in time of the pyrotechnic actuation relays (˜10%). And about 10% variation in velocity of detonation LH. In addition, assuming errors in the design of explosion associated with the wrong choice of time slowing down when explosions neighboring wells, there is a possibility of premature termination detonation in LH because of the shift of the well.

The objective of the invention is the creation of a more efficient blasting method.

The problem is solved due to the fact that in the known method of initiation of explosive materials blasting systems, including initiating surface network with the creation of surface deceleration and initiation of borehole charges, when creating a surface deceleration time ass is Riki initiation between adjacent wells is chosen from the relation T< L/V, where:

T - time delay,

L - the line of least resistance from the nearest blown up well to the initiated,

V is the velocity of the wave of destruction (determines the physical and mechanical condition of the shattered environment), and the initiation of borehole charges realized by the system of non-electric blasting with zero slowdown (SINV-0), to obtain converging detonation of charge the length of the waveguides nonelectrical blasting system regulate.

To improve the accuracy of the actuation surface network, you can use electric detonators with a programmable electronic delay (ADAS).

The proposed method of blasting charges is illustrated by figure 1, where: 1 - electric detonator with the electronic delay (ADAS), 2 - explosive line, 3 - hole cut, 4 - charge of explosive material (VM) in the hole, 5 - borehole system nonelectric blasting (SINV-With-0) with the action in the upper and lower parts of the charge VM, 6 - node connection wiring EDAS with highway 2, L is the line of least resistance between the wells of the top and bottom.

An example of the method of initiation VM

The free ends of the TVC SINV-With-0 are connected with ADAS programmed for the desired reaction time, the ends of the TVC with militants have in the upper and lower parts of the charge VM. For shallow wells can use the sterile one SINV-S-0, for deep (15 m and more) - two or more charges fighters [2]. An explosion at a specified time EDES, after the filing of the control signal, provides the initiation of SINV-C-0, in turn, through the action, exciting detonation charge VM.

High precision control explosion is achieved, first of all, precision actuation ADAS working in the time range 0-12 sec with an accuracy of ±0.5 MS, and the high speed stability of the process in the TVC, component ±1% from the nominal value. Thus, the time delay between actuation of the militants at the length of the TVC 40 m will not exceed 0.4 MS, which at a speed of detonation VM=4 km/s gives the spatial variation of not more than 1.6 m, less than 5% along the length of the column of charge. At the same time excluded burnout charge VM, most of the energy of the explosion is spent on crushing rocks and is marked by a significant decrease of the seismicity of the explosion.

To avoid peripetia waveguide shear deformation of the borehole from the explosion of the previous wells located along the line of least resistance (LNS), when choosing the time of deceleration between them you can use the data [3], where the graphs of attenuation of stress waves in elastic medium and a medium with friction. So, for a grid of wells 7 m x 7 m safe time when the hole diameter of 0.3 m is for elastic medium ˜T=L/V=7 m/350 m/s=20 MS, for a medium with friction is ˜ T=7 m/87,5 m/s=80 MS.

The proposed method was tested on Sibirginskij the incision in the Kemerovo region, where mass was held on 6 explosions in the process which reliably blown over 700 borehole charges VM. Diagonal blasting was carried out with a delay between wells 15-30 MS and between rows 45-60 MS that fit in the estimation of time delays on the value for an environment with friction.

The use of SINV-S-0 with primer-detonator, not containing highly sensitive pyrotechnic igniter composition significantly increases the safety of blasting agents to mechanical impact.

Literature

1. Bunkhouses. // Destruction of rocks by explosion. P. 154-160. Moscow. 1992

2. Safety during blasting. P.40. Moscow. 2001

3. Awiseman, Anichanov. // Wave voltages in the explosion of the well of the charge. Sbuscribe case No. 91/48. P.20, Moscow. 1998

1. The method of initiation of explosive materials blasting systems, including initiating surface network with the creation of surface deceleration and initiation of borehole charges, characterized in that when creating the surface of the deceleration delay time of initiation between adjacent wells is chosen from the relation

T<L/V

where T is the time delay;

L - line n is Kenichiro resistance from the nearest blown up well to the initiated;

V is the velocity of waves of destruction,

and initiation of borehole charges realized by the system of non-electric blasting with zero slowdown, to obtain converging detonation of charge the length of the waveguides nonelectrical blasting system regulate.

2. The method according to claim 1, characterized in that at the initiation of the surface network to create a surface deceleration applied electric detonators with electronic delay.



 

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