Charging method for improving blasting effect of viscoplastic rock mass developed on native fragile structural surface

Abstract

The invention relates to the technical field of blasting, and provides a charging method for improving the blasting effect of a viscoplastic rock mass developed by a native fragile structural plane, which comprises the following steps: explosive selection: selecting an explosive with lower sensitivity and higher energy output according to the characteristics of the viscoplastic rock mass; charging structure design: adopting a sectional charging structure, namely dividing the explosive into a plurality of small sections along the length direction of the blast hole, and separating the sections by using an explosive-proof material; explosive charging is conducted, specifically, explosive is stuffed into the blast hole in a wave type explosive charging mode; according to the method, the effective energy utilization rate of blasting of the viscoplastic rock mass developed on the native fragile structural surface can be remarkably increased, the blasting effect can be improved, the unit explosive consumption can be reduced, meanwhile, the excessive smashing phenomenon can be reduced, and the uniformity of the broken lumpiness can be improved; the method further has good safety and operability and is suitable for blasting operation under various complex geological conditions.

Description

Technical Field

[0001] The invention relates to the technical field of blasting, and in particular to a charging method for improving the blasting effect of a viscoplastic rock mass with developed original fragile structural surfaces. Background Art

[0002] Viscoplastic rock mass refers to rock mass that is prone to plastic deformation under the action of external forces. This type of rock mass usually has low mechanical strength and the ability to transfer stress. After being subjected to force, it mainly releases stress in the form of plastic deformation, and the deformation process is time-dependent. The main mode of destruction of viscoplastic rock mass is viscous shearing, which will produce a large number of inconspicuous hidden cracks and closed cracks. These cracks are narrow, short and densely distributed. Even if tensile cracks are developed, they are often filled and blocked by their own broken mud products.

[0003] Viscoplastic rock masses are mainly composed of viscoplastic rocks, such as mudstone, tuff, etc. The mineral composition and cement properties of these rocks determine their viscoplastic properties. In addition, transitional rocks, such as sandstone, sandy shale, limestone, marble, crystalline schist, gneiss and various igneous rocks, may also exhibit viscoplastic properties under certain conditions.

[0004] When blasting is carried out in viscoplastic rock mass, due to the strong plastic deformation capacity of the rock mass, the energy generated by the explosion of explosives is easily absorbed and dispersed, resulting in unstable blasting effect and low energy utilization rate. Summary of the invention

[0005] The invention provides a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces.

[0006] The technical solution of the present invention is as follows: a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, comprising the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials; S3: charging, using the wave charging method to pack the explosives into the blast hole; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives.

[0007] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0008] In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

[0009] In the step S3, the diameter d of the blasthole is 80-120 mm, the hole depth L is 14-18 m, and the extra depth h is 1 m.

[0010] In the step S3, the charge density is 0.5g / ml-1g / ml, and the unit consumption is 0.2kg / m 3 -0.4kg / m 3 .

[0011] In the step S3, the length of each section of explosive is 1 / 4-1 / 3 of the length of the blasthole, and the length of the explosion-proof material is 1 / 10-1 / 5 of the length of the explosive.

[0012] In the step S3, an air gap is provided between the explosive and the blasthole wall, forming an uncoupled charge structure.

[0013] In the step S3, the air gap is 1 / 100-1 / 300 of the borehole diameter.

[0014] In the step S4, the millisecond difference interval time Δt is determined according to the rock mass crack coefficient Kp and the rock strength coefficient f.

[0015] In step S4, the millisecond difference interval time ms.

[0016] The working principle and beneficial effects of the present invention are: 1. The present invention can significantly improve the effective energy utilization rate of blasting viscoplastic rock mass with developed original fragile structural surfaces, improve the blasting effect, reduce the unit drug consumption, reduce the over-crushing phenomenon, and improve the uniformity of the crushed pieces. In addition, the method has good safety and operability and is suitable for blasting operations under various complex geological conditions.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0022] Example 2 like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0023] In the step S1, the explosive is tetranitroethane PETN.

[0024] Embodiment 3: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0025] In the step S1, the explosive is a modified emulsion explosive.

[0026] Embodiment 4: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0027] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0028] In the step S2, the flameproof material is: ceramic material.

[0029] Embodiment 5: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0030] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0031] In the step S2, the flameproof material is a thermoplastic material.

[0032] Embodiment 6: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0033] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0034] In the step S2, the flameproof material is titanium alloy.

[0035] Embodiment 7: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0036] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0037] In the step S2, the flameproof material is glass fiber reinforced plastic (GFRP).

[0038] Embodiment 8: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0039] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0040] In the step S2, the flameproof material is: carbon fiber reinforced plastic CFRP.

[0041] Embodiment 9: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0042] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0043] In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

[0044] In the step S3, the diameter d of the blasthole is 80, the hole depth L is 14, and the extra depth h is 1m.

[0045] In the step S3, the charge density is 0.5 g / ml and the unit consumption is 0.2 kg / m 3 .

[0046] In the step S3, the length of each section of explosive is 1 / 4 of the length of the blasthole, and the length of the explosion-proof material is 1 / 10 of the length of the explosive.

[0047] Embodiment 10: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0048] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0049] In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

[0050] In step S3, the diameter d of the blasthole is 120 mm, the hole depth L is 18 m, and the extra depth h is 1 m.

[0051] In the step S3, the charge density is 1 g / ml and the unit consumption is 0.4 kg / m 3 .

[0052] In the step S3, the length of each section of explosive is 1 / 3 of the length of the blasthole, and the length of the explosion-proof material is 1 / 5 of the length of the explosive.

[0053] Embodiment 11: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0054] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0055] In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

[0056] In step S3, the diameter d of the blasthole is 100 mm, the hole depth L is 16 m, and the extra depth h is 1 m.

[0057] In the step S3, the charge density is 0.75 g / ml and the unit consumption is 0.3 kg / m 3 .

[0058] In the step S3, the length of each section of explosive is 7 / 24 of the length of the blasthole, and the length of the explosion-proof material is 3 / 5 of the length of the explosive.

[0059] Embodiment 12: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0060] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0061] In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

[0062] In the step S3, the diameter d of the blasthole is 80-120 mm, the hole depth L is 14-18 m, and the extra depth h is 1 m.

[0063] In the step S3, the charge density is 0.5g / ml-1g / ml, and the unit consumption is 0.2kg / m 3 -0.4kg / m 3 .

[0064] In the step S3, the length of each section of explosive is 1 / 4-1 / 3 of the length of the blasthole, and the length of the explosion-proof material is 1 / 10-1 / 5 of the length of the explosive.

[0065] In the step S3, an air gap is provided between the explosive and the blasthole wall, forming an uncoupled charge structure.

[0066] Embodiment 13: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0067] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0068] In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

[0069] In the step S3, the diameter d of the blasthole is 80-120 mm, the hole depth L is 14-18 m, and the extra depth h is 1 m.

[0070] In the step S3, the charge density is 0.5g / ml-1g / ml, and the unit consumption is 0.2kg / m 3 -0.4kg / m 3 .

[0071] In the step S3, the length of each section of explosive is 1 / 4-1 / 3 of the length of the blasthole, and the length of the explosion-proof material is 1 / 10-1 / 5 of the length of the explosive.

[0072] In the step S3, an air gap is provided between the explosive and the blasthole wall, forming an uncoupled charge structure.

[0073] In the step S3, the air gap is 1 / 100 of the diameter of the blast hole to reduce the peak explosion pressure, avoid excessive rock crushing, and prolong the explosion pressure action time.

[0074] In the step S4, the millisecond difference interval time Δt is determined according to the rock mass crack coefficient Kp and the rock strength coefficient f. ms.

[0075] Embodiment 14: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0076] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0077] In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

[0078] In the step S3, the diameter d of the blasthole is 80-120 mm, the hole depth L is 14-18 m, and the extra depth h is 1 m.

[0079] In the step S3, the charge density is 0.5g / ml-1g / ml, and the unit consumption is 0.2kg / m 3 -0.4kg / m 3 .

[0080] In the step S3, the length of each section of explosive is 1 / 4-1 / 3 of the length of the blasthole, and the length of the explosion-proof material is 1 / 10-1 / 5 of the length of the explosive.

[0081] In the step S3, an air gap is provided between the explosive and the blasthole wall, forming an uncoupled charge structure.

[0082] In the step S3, the air gap is 1 / 300 of the blast hole diameter to reduce the peak explosion pressure, avoid excessive rock crushing, and prolong the explosion pressure action time.

[0083] In the step S4, the millisecond difference interval time Δt is determined according to the rock mass crack coefficient Kp and the rock strength coefficient f. ms.

[0084] Embodiment 15: like Figure 1 As shown, this embodiment proposes a charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, which includes the following steps: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials. Segmented charge can make the blast energy evenly distributed, prolong the blast pressure action time, and improve the utilization rate of blast energy; S3: Charging, using the wave charging method to pack the explosives into the blast hole, this method can increase the explosive surface area of ​​the explosives and improve the uniformity of the explosion energy release; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives, so that the stress wave in the rock is superimposed with the stress generated previously, thereby improving the utilization rate of blasting energy.

[0085] In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

[0086] In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

[0087] In the step S3, the diameter d of the blasthole is 80-120 mm, the hole depth L is 14-18 m, and the extra depth h is 1 m.

[0088] In the step S3, the charge density is 0.5g / ml-1g / ml, and the unit consumption is 0.2kg / m 3 -0.4kg / m 3 .

[0089] In the step S3, the length of each section of explosive is 1 / 4-1 / 3 of the length of the blasthole, and the length of the explosion-proof material is 1 / 10-1 / 5 of the length of the explosive.

[0090] In the step S3, an air gap is provided between the explosive and the blasthole wall, forming an uncoupled charge structure.

[0091] In the step S3, the air gap is 1 / 150 of the diameter of the blast hole to reduce the peak explosion pressure, avoid excessive rock crushing, and prolong the explosion pressure action time.

[0092] In the step S4, the millisecond difference interval time Δt is determined according to the rock mass crack coefficient Kp and the rock strength coefficient f. ms.

[0093] In this embodiment, the effective energy utilization rate of blasting viscoplastic rock mass with developed original fragile structural surfaces can be significantly improved, the blasting effect can be improved, the unit drug consumption can be reduced, and at the same time, the excessive crushing phenomenon can be reduced and the uniformity of the crushed block size can be improved. In addition, this method also has good safety and operability and is suitable for blasting operations under a variety of complex geological conditions.

[0094] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surfaces, characterized in that: The following steps are involved: S1: Explosive selection: according to the characteristics of viscoplastic rock mass, choose explosives with lower sensitivity and higher energy output; S2: Charge structure design, adopting segmented charge structure, that is, the explosive is divided into multiple small sections along the length of the blasthole, and each section is separated by explosion-proof materials; S3: charging, using the wave charging method to pack the explosives into the blast hole; S4: Detonation logic setting, using millisecond differential extrusion blasting to control the detonation time of each section of explosives.

2. The charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 1, characterized in that: In the step S1, the explosive is tetranitroethane PETN or a modified emulsion explosive.

3. The charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 2, characterized in that: In the step S2, the flameproof material is any one of: ceramic material, thermoplastic material, titanium alloy, glass fiber reinforced plastic GFRP, and carbon fiber reinforced plastic CFRP.

4. The charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 3 is characterized in that: In the step S3, the diameter d of the blasthole is 80-120 mm, the hole depth L is 14-18 m, and the extra depth h is 1 m.

5. The charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 4, characterized in that: In the step S3, the charge density is 0.5g / ml-1g / ml, and the unit consumption is 0.2kg / m 3 -0.4kg / m 3 .

6. The charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 5, characterized in that: In the step S3, the length of each section of explosive is 1 / 4-1 / 3 of the length of the blasthole, and the length of the explosion-proof material is 1 / 10-1 / 5 of the length of the explosive.

7. The charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 6, characterized in that: In the step S3, an air gap is provided between the explosive and the blasthole wall, forming an uncoupled charge structure.

8. The charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 7, characterized in that: In the step S3, the air gap is 1 / 100-1 / 300 of the borehole diameter.

9. The charging method for improving the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 8, characterized in that: In the step S4, the millisecond difference interval time Δt is determined according to the rock mass crack coefficient Kp and the rock strength coefficient f.

10. The method for charging explosives to improve the blasting effect of viscoplastic rock mass with developed original fragile structural surface according to claim 9, wherein in the step S4, the millisecond difference interval time ms.

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