CN111895872B - In-hole charging structure for controlling blasting root bottom and construction method thereof - Google Patents
In-hole charging structure for controlling blasting root bottom and construction method thereof Download PDFInfo
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- CN111895872B CN111895872B CN202010889809.XA CN202010889809A CN111895872B CN 111895872 B CN111895872 B CN 111895872B CN 202010889809 A CN202010889809 A CN 202010889809A CN 111895872 B CN111895872 B CN 111895872B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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Abstract
The invention discloses a hole charging structure for controlling a blasting root bottom, wherein an inert interlayer is arranged in a charging section and divides the charging section into an upper charging section and a lower charging section; the first detonating detonator is arranged at the middle lower part of the upper charging section, the second detonating detonator is arranged close to the top end of the lower charging section, and the first detonating detonator and the second detonating detonator are both connected to the blasting network through leg wires; the explosive filled in the blast hole is divided into an upper explosive charging section and a lower explosive charging section by adopting the inert interlayer, and the explosive above the inert interlayer is used for forming an ideal blasting funnel so as to ensure the crushing and throwing effects of a rock body; the explosive below the inert interlayer is used for enhancing the breaking of the rock mass at the bottom of the hole so as to reduce the blasting root; the invention fully utilizes the regulation and control function of the detonating primer on the detonation energy transmission, realizes the optimized utilization of the explosive energy, and achieves the double purposes of forming a more ideal blasting funnel to ensure the crushing and throwing effects and increasing the hole bottom rock mass crushing to reduce the blasting root.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering blasting, and particularly relates to a hole charging structure for controlling a blasting root bottom and a construction method thereof.
Background
In the engineering fields of mining, traffic, hydropower, municipal engineering and the like, blasting excavation or mining of rock masses is often involved, and drilling bench blasting is a widely adopted method. In the step blasting, the control of the residual root can not be ignored, and due to the excessive root, the pushing-out of the blasting chassis of the next step can be retarded, the blasting effect of the subsequent step is influenced, the secondary treatment cost can be increased, and the construction efficiency is greatly reduced. How to effectively control the blasting root is always a difficult problem which troubles field construction personnel.
The existing method for controlling the blasting root mostly starts from the aspects of optimizing blasting design and blasting circuits, such as locally increasing ultra-depth, increasing the density coefficient of blast holes, adopting V-shaped blasting circuits and blasting modes with wide hole distance and small resistant lines, and the like. The detonation of the explosive in the blast hole is usually completed by a delay detonator, however, in consideration of blasting fragmentation and throwing effects, the bottom detonation mode is selected in the blasting field, and the optimal utilization of the explosive energy is realized from the angle of the position adjustment of the detonation detonator.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a hole charging structure for controlling a blasting root and a construction method thereof, aiming at solving the technical problem that the blasting root is difficult to control in the prior art, and realizing the optimized utilization of explosive energy by utilizing the regulation and control of a detonating detonator on the blasting energy transmission.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a hole-in-hole charging structure for controlling a blasting root, which comprises a detonator leg wire, a blocking section, a charging section, a first detonating detonator, an inert interlayer and a second detonating detonator, wherein the blocking section and the charging section are respectively arranged in a blast hole from top to bottom; the inert interlayer is arranged in the charge section and divides the charge section into an upper charge section and a lower charge section, and the upper charge section and the lower charge section are detonated in sections; the first detonating detonator is arranged at the middle lower part of the upper charging section, the second detonating detonator is arranged close to the top end of the lower charging section, and the first detonating detonator and the second detonating detonator are connected to the blasting network through detonator leg wires.
Furthermore, the length of the upper charge section is 3/5-3/4 of the total length of the charge sections, and the length of the lower charge section is 1/4-2/5 of the total length of the charge sections.
Furthermore, the first detonating detonator is arranged at a position which is far from the bottom 1/4-2/5 of the upper charging section, and the energy-gathered hole of the first detonating detonator is arranged upwards.
Further, a second detonating detonator is arranged at a position 10-20cm away from the top end of the lower charging section, and the energy-gathered holes of the second detonating detonator are arranged downwards.
Further, the size of the inert interlayer along the axial direction of the blast hole is 1.5-2 times of the sympathetic detonation distance of the explosive, and the diameter of the inert interlayer is 0.85-0.95 times of the diameter of the blast hole.
Furthermore, the inert interlayer adopts an air bag, a sand bag or a sand bag.
Further, the length of the blocking section is 0.9-1.0 times of the minimum resistance line.
Further, the first and second initiation detonators have the same length.
The invention also provides a construction method for controlling the hole charging structure of the blasting root, which comprises the following steps:
drilling blast holes to the design requirements according to the blasting design requirements, and reserving an ultra drill;
firstly, filling the explosive of the lower explosive charging section, and placing a second detonating detonator in the lower explosive charging section; then an inert interlayer is filled; then filling the explosive of the upper explosive loading section, and placing a first detonating detonator in the upper explosive loading section; after charging, the first detonating detonator and the second detonating detonator are pulled to the orifice of the blast hole through the detonator foot wire; and finally, filling the blocking section.
Further, in the step 1, the over drilling length is 20-30 cm.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a hole charging structure for controlling blasting root bottom, which adopts an inert interlayer to divide explosive filled in a blast hole into an upper charging section and a lower charging section, wherein the upper charging section and the lower charging section are detonated in sections; the explosive above the inert interlayer is used for forming an ideal blasting funnel so as to ensure the crushing and throwing effects of the rock mass; the explosive below the inert interlayer is used for enhancing the breaking of the rock mass at the bottom of the hole so as to reduce the blasting root; the invention fully utilizes the regulation and control function of the detonating primer on the blasting energy transmission to realize the optimized utilization of the explosive energy, thereby achieving the double purposes of forming a more ideal blasting funnel to ensure the crushing and throwing effects and increasing the hole bottom rock mass crushing to reduce the blasting root bottom.
Furthermore, the energy-gathered holes of the first detonating detonator are arranged upwards, so that the detonation wave of the upper explosive charging section is mainly propagated upwards, the explosive energy of the explosive above the inert interlayer is deviated to the orifice for transmission, the large block rate of the orifice is reduced, and an ideal blasting funnel is formed to ensure the crushing and throwing effects of the rock mass.
Furthermore, the energy-gathered holes of the second detonating detonator are arranged downwards, so that the detonation waves of the lower charging section are mainly transmitted downwards, the detonation energy of the explosive below the inert interlayer is transmitted towards the bottom of the hole, and the breakage of the rock mass at the bottom of the hole is enhanced to reduce the blasting root.
Furthermore, the explosive filled in the blast hole is divided into two independent sections by the inert interlayer for detonation, on one hand, the explosive is prevented from being detonated in a designed mode due to delay errors of the detonators, and on the other hand, the mutual collision of detonation waves between an upper detonation detonator and a lower detonation detonator is prevented, so that the blasting effect is influenced.
The invention also provides a construction method of the hole charging structure for controlling the blasting root, which realizes the optimized utilization of the explosive energy only based on the adjustment of the position of the explosive detonating detonator in a single blast hole, has simple operation, does not increase extra cost and has lower cost.
The invention reduces the extra depth or weakens the hidden quality of the bottom reinforced charge, simultaneously considers the requirements of the orifice and the bottom rock mass on energy, not only can reduce the orifice bulk rate and form an ideal blasting funnel to ensure the crushing and throwing effects, but also can enhance the crushing of the bottom rock mass and effectively reduce the blasting root.
Drawings
FIG. 1 is a schematic diagram of a charge configuration in a hole for controlling the bottom of a blast root according to the present invention;
FIG. 2 is a one-dimensional flow model of detonation of a columnar charge;
FIG. 3 is a schematic diagram of the distribution of explosive energy along the axial direction of a blast hole and the corresponding fragmentation profile in a conventional bottom-firing mode;
FIG. 4 is a schematic diagram of the distribution of the explosive energy along the axial direction of the blast hole and the corresponding fragmentation profile in a conventional upper part detonation mode;
FIG. 5 is a schematic view showing the arrangement of blast holes in a bench blasting;
fig. 6 is a cross-sectional view taken along line I-I in fig. 5.
Wherein, 1 detonator leg wire, 2 plugging sections, 3 charging sections, 4 first detonating detonators, 5 inert interlayers, 6 second detonating detonators, 7 detonation wave propagation directions, 8 explosive detonating points, 9 vacuum rigid tubes, 10 explosive energy distribution along the axial direction of blast holes, 11 rock mass breaking outlines, 12 blast holes and 13 minimum resisting wires; 31 upper charge section and 32 lower charge section.
Detailed Description
For a better understanding of the present invention, the following examples illustrate the present invention in detail.
As shown in the attached drawing 1, the hole inner charging structure for controlling the blasting root comprises a detonator leg wire 1, a blocking section 2, a charging section 3, a first detonating detonator 4, an inert interlayer 5 and a second detonating detonator 6, wherein the blocking section 2 and the charging section 3 are respectively arranged in a blast hole 12 from top to bottom; the inert interlayer 5 is arranged in the charge section 3 and divides the charge section 3 into an upper charge section 31 and a lower charge section 32, and the upper charge section 31 and the lower charge section 32 are detonated in sections; first detonating detonator 4 is arranged at the middle lower part of upper charge section 31, second detonating detonator 6 is arranged near the top end of lower charge section 32, and first detonating detonator 4 and second detonating detonator 6 are both connected to the blasting network through detonator leg wire 1.
The length of the upper charge section 31 is 3/5-3/4 of the total length of the charge section 3, and the length of the lower charge section 32 is 1/4-2/5 of the total length of the charge section 3; the first detonating primer 4 is arranged at a position 1/4-2/5 away from the bottom of the upper charging section 31, and the energy-gathered holes of the first detonating primer 4 are arranged upwards, so that the detonation wave of the first detonating primer 4 is mainly upwards propagated, the detonation energy can be deviated to the orifice for transmission, namely, the explosives above the inert interlayer are mainly used for forming an ideal blasting funnel so as to ensure the crushing and throwing effects of the rock mass; the second detonating detonator 6 is arranged at a position 10-20cm away from the top end of the lower charging section 32, the energy-gathered holes of the second detonating detonator 6 are arranged downwards, the detonation waves are spread downwards, the detonation energy can be deviated to the bottom of the hole for transmission, namely, the explosives below the inert interlayer are mainly used for enhancing the breakage of the bottom of the hole to reduce the blasting root;
the sections of the first detonating detonator 4 and the second detonating detonator 6 are the same, and the leg wires of the first detonating detonator and the second detonating detonator are combined into a strand and are connected into the blasting network together.
The preparation of the inert interlayer 5 can be determined according to field conditions, as long as the explosives at the upper section and the lower section of the interlayer are not mutually detonated, preferably, the inert interlayer 5 is made of inert materials such as an air bag, a sand bag or a sand bag; the size of the inert interlayer 5 along the axial direction of the blast hole is 1.5-2 times of the sympathetic detonation distance of the explosive, and the diameter of the inert interlayer 5 is 0.85-0.95 times of the diameter of the blast hole.
The length of the blocking section 2 is 0.9-1.0 times of the minimum resistance line 13; when finished explosive cartridges are filled in the upper explosive filling section 31 or the lower explosive filling section 32, non-coupling explosive filling is adopted, and the non-coupling coefficient is 1.2-1.5; when the on-site mixed charge is adopted in the upper charge section 31 or the lower charge section 32, the coupled charge is adopted.
The invention relates to a hole charging structure for controlling blasting root bottom, which adopts an inert interlayer to divide the explosive filled in a blast hole into two sections, the explosive above the inert interlayer adopts a mode of middle-lower part detonation, and a first detonation detonator of the explosive above the inert interlayer is arranged at the middle-lower part of an upper charging section; the explosive below the inert interlayer is detonated at the upper part, and a second detonating detonator is arranged at the top of the explosive charging section; the explosive in the blast hole is divided into two independent sections by the inert interlayer for detonation, and is not continuously detonated, so that the explosive is not detonated according to a designed mode due to delay errors of the detonators, and the detonation waves generated between the upper detonation detonator and the lower detonation detonator are prevented from colliding with each other, so that the blasting effect is influenced.
The hole charging structure for controlling the blasting root bottom can realize the optimized utilization of the explosive energy only based on the adjustment of the position of the explosive detonating detonator in a single blast hole, has simple operation, does not increase additional cost, reduces the extra depth or weakens the hidden quality of the hole bottom reinforced charging, simultaneously considers the requirements of the breaking of the orifice and the hole bottom rock mass on the energy, not only can reduce the large block rate of the orifice and form an ideal blasting funnel to ensure the breaking and throwing effects, but also can enhance the breaking of the hole bottom rock mass and effectively reduce the blasting root bottom.
The invention also provides a construction method for controlling the hole charging structure of the blasting root, which comprises the following steps:
drilling a blast hole 12 to the design requirement according to the blasting design requirement, reserving an excess drill, wherein the excess drill is 20-30 cm long, and reserving a certain slag filling margin for hole bottom leveling by setting the excess drill.
firstly, checking the pore-forming quality, such as whether the pore depth and the pore inclination reach the standard, whether the pore collapse exists and the like; respectively calibrating the elevation of the orifice and the bottom of the hole, and ensuring the bottoms of all blast holes to be at the same design elevation as far as possible by adopting a method of filling drilling rock debris or rock slag; hole bottom leveling is performed to obtain a relatively flat step floor.
the explosive of the lower charge section 32 is first charged and a second detonating primer 6 is placed in the lower charge section 32; then an inert interlayer 5 is filled; thereafter charging the explosive of the top charge section 31 and placing the first detonation detonator 4 in the top charge section; after charging, the leg wires of the first detonating detonator 4 and the second detonating detonator 6 are pulled to the orifice of the blast hole through the leg wire 1; and finally, filling the blocking section.
The invention provides an arrangement mode of the in-hole detonating detonators for controlling the blasting root bottom from the perspective of optimizing the position of the detonating detonators of the explosives in a single blast hole and based on the regulation and control effect of the detonating detonators on the detonation energy transmission; the position of the detonating detonator in the hole determines the propagation direction of the detonation wave, and the transmission of the detonation energy can be influenced, so that part of the detonation energy can be transmitted to the bottom of the hole by properly adjusting the position of the detonating detonator, the breakage of the rock mass at the bottom of the hole is enhanced, and the purpose of reducing the blasting root is achieved; the regulation and control function of the detonating detonator on the detonation energy transmission is fully utilized, and the optimized utilization of the explosive energy is realized, so that the dual purposes of forming an ideal blasting funnel to ensure the crushing and throwing effects and increasing the hole bottom rock mass crushing to reduce the blasting root bottom are achieved.
For the detonation of the columnar charge, based on the assumed one-dimensional flow model, as shown in fig. 2, the columnar charge is disposed in the vacuum rigid tube 9, and it can be known that the energy finally transmitted to the left and right sides of the detonation point is:
if the detonation point is assumed to be at the left end of the charge, the final energy transfer is satisfied:
in the two formulae, E a 、E b The right side is the energy transmitted to the left side and the right side of the detonation point respectively, rho and D are the density and the detonation velocity of the explosive respectively, S is the cross-sectional area of the explosive package, a, b and l are the length of the explosive package on the left side and the right side of the detonation point respectively and the total length of the explosive package, and l is a + b.
According to the two formulas, the position of the explosive detonation point 8 has a great regulation and control function on the transmission of the explosive energy of the columnar explosive package, and under the condition that the left end of the explosive package is detonated, the energy transmitted to the right side of the explosive package is about 1.5 times of the energy of the left side, namely the explosive energy is deflected to the forward transmission of the propagation of the detonation wave.
The invention discloses a hole charging structure for controlling a blasting root, which is an optimized explosive detonation mode mainly based on comprehensive consideration of respective advantages and disadvantages of a traditional bottom detonation mode and an upper detonation mode.
If the first detonation detonator 4 is placed at the bottom end of the charge, i.e. bottom detonation, as shown in figure 3, the detonation wave propagates upwards in the direction 7; the explosion energy is transmitted along the axial distribution 10 of the blast hole and is deviated to the orifice, the rock mass crushing profile 11 of the blast hole is a vertical funnel, which is favorable for reducing the large block rate of the orifice and ensuring more ideal crushing and throwing effects, but is not favorable for crushing the rock mass at the bottom of the hole, and the blasting root is easy to form.
As shown in fig. 4, if the second initiation detonator 6 is placed on top of the charge, i.e. the upper portion is initiated, the propagation direction 7 of the detonation wave is downward; the distribution 10 of explosion energy along the axial direction of the blast hole is deviated from the hole bottom for transmission, the rock mass crushing profile 11 of the blast hole is an inverted funnel, which is beneficial to the crushing of the rock mass at the hole bottom and can reduce the blasting root, but the blast hole is easy to form a large block at the hole opening, and the crushing and throwing effects are poor.
Examples
In the construction process of a certain petrochemical base, a large number of earth and stone excavation is involved, and a deep hole bench blasting method is mainly adopted. The height of the step of conventional blasting is 13.0m, quincunx holes are distributed, the row spacing between blast holes is 6.0m multiplied by 3.5m, the diameter of each blast hole is 115mm, the inclination angle alpha is 80 degrees, the drilling depth is 14.5m, the charging length is 9.0m, the adopted explosive is 2# rock emulsion explosive, and the explosive is finished product cartridge.
The invention discloses a hole charging structure for controlling blasting root bottom, which comprises the following steps:
(1) drilling a blast hole: and drilling a blast hole to a designed elevation according to the requirement of blasting design, and reserving 20-30 cm of ultra-drilling.
(2) Checking the quality of formed holes and leveling the hole bottoms: firstly, checking the quality of formed holes, such as whether the hole depth and the hole inclination reach the standard or not, whether hole collapse exists or not, and the like; and then the elevation of the hole opening and the hole bottom are respectively calibrated, and the hole bottoms of all blast holes are ensured to be at the same design elevation as far as possible by adopting a method of filling drilling rock debris or rock slag.
(3) Charging and blocking: firstly, filling explosive with the length of 1/3 below the inert interlayer, wherein the length of the lower explosive charging section is 3.0m, and placing a second detonating detonator 10-20cm away from the top end of the explosive package of the lower explosive charging section to ensure that the energy-gathered cavity of the second detonating detonator faces downwards; then filling a pre-prepared inert barrier layer; continuing to load explosive 2/3 lengths above the inert barrier, in this example the upper charge section is 6.0m in length, and placing the primary detonation detonator below 1/3 m, in this example 2.0m from the bottom end of the upper charge section, ensuring that the shaped energy cavity of the primary detonation detonator is up; after charging, combining the leg wires of the two detonators into one strand and drawing the strand to an orifice; finally, filling the blocking section by adopting drilling rock debris or rock slag; the inert interlayer in the example is prepared from a columnar PVC pipe sealed from top to bottom, the diameter of the PVC pipe is 100-105 mm, the height of the PVC pipe is 1.5-2.0 times of the sympathetic detonation distance of the 2# rock emulsion explosive, and the height of the PVC pipe is 8-10 cm.
(4) Networking and detonating: and connecting the leg wires of the detonating detonators into a detonating network according to design requirements, checking the accuracy and safety of the network, making safety warning, and finally finishing the detonating.
(5) And (3) blasting effect inspection: after blasting is finished, the blasting pile form is carefully observed, the orifice blocks are counted, and after slag removal is finished, the number of blasting root bottoms is checked, and the elevation of the step bottom plate is measured so as to evaluate the effect of root bottom control.
The invention relates to a hole charging structure for controlling the blasting root bottom, which adopts an inert interlayer to divide the explosive filled in a blast hole into two sections, wherein the explosive above the inert interlayer is detonated by adopting a middle-lower part mode, namely, the detonating detonator of the explosive above the inert interlayer is arranged at the middle-lower part of an upper charging section; the explosive below the inert interlayer adopts an upper detonating mode, namely, a detonating detonator is arranged on the upper part of the lower charging section. The invention takes the requirements of orifice and hole bottom rock mass crushing on energy into consideration based on the regulation and control function of the detonating detonator on the blasting energy transmission, not only can form a more ideal blasting funnel and reduce the orifice bulk rate to ensure the crushing and throwing effects, but also can enhance the crushing of the hole bottom rock mass and achieve the purpose of reducing the blasting root, has the advantages of simple and convenient operation, low cost and the like, can be widely applied to rock mass blasting excavation or exploitation in the engineering fields of mining, traffic, hydropower, municipal administration and the like, and is particularly suitable for step blasting.
The above description is only illustrative of the preferred embodiments of the present invention, and any structural changes, improvements, modifications, etc. made without departing from the principle of the present invention are deemed to be within the scope of the present invention.
Claims (7)
1. An in-hole charging structure for controlling a blasting root bottom is characterized by comprising a detonator leg wire (1), a blocking section (2), a charging section (3), a first detonating detonator (4), an inert interlayer (5) and a second detonating detonator (6), wherein the blocking section (2) and the charging section (3) are respectively arranged in a blast hole (12) from top to bottom; the inert interlayer (5) is arranged in the charge section (3) and divides the charge section (3) into an upper charge section (31) and a lower charge section (32), and the upper charge section (31) and the lower charge section (32) are detonated in sections; the first detonating detonator (4) is arranged at the middle lower part of the upper charging section (31), the second detonating detonator (6) is arranged close to the top end of the lower charging section (32), and the first detonating detonator (4) and the second detonating detonator (6) are both connected to the blasting network through detonator leg wires (1);
the size of the inert interlayer (5) along the axial direction of the blast hole is 1.5-2 times of the sympathetic detonation distance of the explosive, and the diameter of the inert interlayer (5) is 0.85-0.95 times of the diameter of the blast hole;
the inert interlayer (5) adopts an air bag, a sand bag or a sand bag;
the sections of the first detonating detonator (4) and the second detonating detonator (6) are the same.
2. A hole charge configuration for controlling the bottom of a blasting root according to claim 1, characterized in that the length of the upper charge section (31) is 3/5-3/4 of the total length of the charge section (3), and the length of the lower charge section (32) is 1/4-2/5 of the total length of the charge section (3).
3. A hole charge arrangement for controlling the bottom of a blast root according to claim 1, characterised in that the primary detonation detonator (4) is arranged at a distance from the bottom 1/4-2/5 of the upper charge section (31), the shaped cavity of the primary detonation detonator (4) being arranged upwardly.
4. A hole charge arrangement for controlling the bottom of a blast root according to claim 1, characterised in that a second initiation detonator (6) is arranged at a distance of 10-20cm from the top end of the lower charge section (32), the shaped cavity of the second initiation detonator (6) being arranged downwards.
5. A hole charge configuration for controlling the bottom of a blasting root according to claim 1, characterised in that the length of the plug section (2) is 0.9-1.0 times the minimum resistance line.
6. A method of construction for controlling a hole charge configuration in a blast root, as claimed in any one of claims 1 to 5, comprising the steps of:
step 1, drilling a blast hole (12):
drilling a blast hole (12) to the design requirement according to the blasting design requirement, and reserving an ultra drill;
step 2, checking the hole forming quality and leveling the hole bottoms to ensure that the hole bottoms of all blast holes are at the same preset elevation;
step 3, charging and blocking:
firstly, filling the explosive of the lower explosive charge section (32), and placing a second detonating detonator (6) in the lower explosive charge section (32); then an inert interlayer (5) is filled; then the explosive of the upper explosive charge section (31) is filled, and a first detonating detonator (4) is arranged in the upper explosive charge section; after charging, the first detonating detonator (4) and the second detonating detonator (6) are pulled to the orifice of the blast hole through the detonator foot wire (1); and finally, filling the blocking section (2).
7. A construction method for controlling a hole charging structure for blasting root bottom according to claim 6, characterized in that in step 1, the over-drilling length is 20-30 cm.
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| CN114353609B (en) * | 2021-12-21 | 2023-05-12 | 湖北工业大学 | Structure and method for sectional charging in downward blast hole |
| CN115127413B (en) * | 2022-07-19 | 2023-06-02 | 中国人民解放军陆军工程大学 | Integrated rapid blasting excavation device and method for hard rock |
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| CN105651127A (en) * | 2016-01-28 | 2016-06-08 | 中钢集团马鞍山矿山研究院有限公司 | Charge system for advance rock breaking of surface mine |
| CN107957222A (en) * | 2017-11-28 | 2018-04-24 | 武汉大学 | Reduce blasthole spaced loading and the method for ignition of methods of blasting toes in open generation rate |
| CN110906822A (en) * | 2019-12-19 | 2020-03-24 | 中国水利水电第七工程局有限公司 | Deep hole blasting charge and detonation method for reducing root bottom based on digital detonator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105571419A (en) * | 2016-01-28 | 2016-05-11 | 中钢集团马鞍山矿山研究院有限公司 | Blasting method capable of effectively reducing blasting boulder yield of surface mine |
| CN105651127A (en) * | 2016-01-28 | 2016-06-08 | 中钢集团马鞍山矿山研究院有限公司 | Charge system for advance rock breaking of surface mine |
| CN107957222A (en) * | 2017-11-28 | 2018-04-24 | 武汉大学 | Reduce blasthole spaced loading and the method for ignition of methods of blasting toes in open generation rate |
| CN110906822A (en) * | 2019-12-19 | 2020-03-24 | 中国水利水电第七工程局有限公司 | Deep hole blasting charge and detonation method for reducing root bottom based on digital detonator |
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