Blast hole recyclable water insulation device and water insulation method for water-rich fractured rock mass

Abstract

The invention relates to the technical field of rock mass engineering blasting, in particular to a water insulation device and a water insulation method. The blast hole recyclable water insulation device for the water-rich fractured rock mass comprises an outer bag body, an inner bag body, an air valve and a pressure gauge, one end of the outer bag body is provided with an opening, the outer bag body sleeves the inner bag body through the opening, the air valve is mounted on the inner bag body, and the pressure gauge is mounted on the air valve; a capsule diaphragm is arranged on the inner side wall of the end, away from the opening, of the outer capsule, a balance weight cavity used for being filled with heavy objects is formed between the capsule diaphragm and the end, away from the opening, of the outer capsule, and the inner capsule can extrude the outer capsule to be tightly attached to the hole wall of the blast hole after being inflated with gas. By the adoption of the water insulation device, crack water can be isolated in the rock mass, the crack water is prevented from immersing into a blast hole to damage a blast hole structure, the influence of a water hole on blasting construction is fundamentally solved, the recyclable use function can be provided, and the problems that an existing device is a disposable consumable, and the batch use cost is difficult to control are solved.

Description

Technical Field

[0001] The invention relates to the technical field of rock mass engineering blasting, and in particular to a water-isolating device and a water-isolating method. Background Art

[0002] In the existing energy mining, most of the resources are buried underground and need to be stripped from the rock mass by drilling and blasting. However, due to factors such as climatic conditions and river transportation, the rock mass is usually rich in a large amount of fissure water. During the drilling and blasting construction process, after the blasthole is drilled according to the design, the blasthole, as a connecting vessel, changes the original flow state of the fissure water, prompting the surrounding fissure water to gather in the blasthole, resulting in water accumulation in the blasthole. The blasthole wall is saturated and expanded under the long-term immersion in water. In addition, the circulation of the surrounding fissure water makes it easy to collapse under the action of gravity. On the one hand, the integrity of the hole wall The hole is destroyed and the structure inside the hole is unclear, resulting in a large difference between the on-site charging and the design, uncontrollable blasting hazards, and excessive safety hazards. On the other hand, the rock mass on the hole wall is mixed with water to form muddy water. Due to the large buoyancy of muddy water, it is difficult for the explosives to sink to the bottom of the blasthole during the charging process, resulting in too long charging time and too low operating efficiency. In addition, the mixing of impurities in the muddy water and the explosives changes the detonation performance of the explosives and reduces the initial explosion energy of the explosives, resulting in the blasting quality of the surrounding rock mass being difficult to meet the requirements and requiring secondary treatment, with poor economic benefits.

[0003] Due to the negative effects of water accumulation in blastholes, most construction methods currently use spacers. However, spacers can only isolate the accumulated water at the bottom of the blasthole along the axial direction of the blasthole, and cannot fundamentally prevent the fissure water from infiltrating into the blasthole. In addition, explosives can only be loaded above the air spacer. After the explosion, most of the energy acts on the rock mass above the spacer, and the explosive strength of the bottom water-bearing rock mass is reduced. The foundation is easily left after blasting and excavation. In addition, the spacer is usually damaged once and has no reusable function. When there are too many water-containing blastholes, the amount used is large and the construction cost is too high. Based on this, it is necessary to develop a convenient construction and low-cost device to isolate the fissure water and prevent the fissure water in the rock mass from infiltrating into the blasthole, thereby providing a good charging environment for blasting construction, while ensuring the charging quality, and improving the operating efficiency and the ability of explosives to work on the rock mass. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a recyclable water-isolating device and water-isolating method for blastholes in water-rich fractured rock mass. The water-isolating device can isolate the fractured water in the rock mass, prevent the fractured water from seeping into the blasthole and destroying the blasthole structure, provide a good charging environment for blasting construction, allow the explosives to fully release energy, improve the ability of the explosives to work on the surrounding rock mass, ensure the blasting quality, fundamentally solve the impact of water holes on blasting construction, and provide a recyclable function to solve the problem that the existing device is a disposable consumable and the cost of batch use is difficult to control. The water-isolating method is an implementation method of the water-isolating device, which can achieve the above purpose through the water-isolating device.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a recyclable water-isolating device for blastholes in water-rich fractured rock mass, comprising: an outer bladder, an inner bladder, an air valve and a pressure gauge; one end of the outer bladder has an opening, the outer bladder is sleeved on the inner bladder through the opening, the air valve is mounted on the inner bladder, and the pressure gauge is mounted on the air valve; a bladder diaphragm is provided on the inner side wall of the end of the outer bladder away from the opening, a counterweight cavity for filling with heavy objects is formed between the bladder diaphragm and the end of the outer bladder away from the opening, and the inner bladder can squeeze the outer bladder to fit tightly with the blasthole wall after gas is injected into the inner bladder; when water-isolating the blasthole in water-rich fractured rock mass, first fill the counterweight cavity with heavy objects, then put the outer bladder and the inner bladder into the blasthole, then inflate the inner bladder through the air valve, the inner bladder expands and squeezes the outer bladder to fit tightly with the blasthole wall, then deflate the inner bladder, the deflated inner bladder and the outer bladder are separated from each other, and finally the outer bladder can be filled with explosives. The outer capsule can isolate the fissure water in the rock mass, preventing the fissure water from seeping into the blasthole and destroying the blasthole structure, providing a good loading environment for blasting construction, allowing the explosives to fully release energy, improving the ability of the explosives to work on the surrounding rock mass, ensuring the blasting quality, and fundamentally solving the impact of water holes on blasting construction. The inner capsule can be reused, which can solve the problem that the existing device is a disposable consumable and the cost of batch use is difficult to control.

[0007] Optionally, a first rope is provided at the opening edge of the outer sac, and a second rope is provided at the end of the outer sac away from the opening; the first rope can fix the inner sac and the outer sac, and the second rope can fix the weight in the counterweight cavity.

[0008] Optionally, the thickness of the outer balloon is smaller than the thickness of the inner balloon, so that the outer balloon can be squeezed after the inner balloon is inflated.

[0009] Optionally, the thickness of the outer balloon is 0.3 mm to 0.5 mm, and the thickness of the inner balloon is 0.7 mm to 1.8 mm, which further ensures the convenience of squeezing the outer balloon after the inner balloon is inflated.

[0010] Optionally, the tear strength of the outer balloon is greater than 20kN / m, and the tensile strength is greater than 20N, so as to ensure that when the inner balloon is inflated and the outer balloon is attached to the hole wall, the outer balloon can resist the buoyancy given to the outer balloon by the fissure water penetrating along the hole wall into the hole bottom without being damaged by the rock of the hole wall, and in rock masses with relatively developed fissures, the outer balloon can resist the impact of the air pressure of the adjacent blast hole on the outer balloon during drilling.

[0011] Optionally, the retractable diameter of the inner bladder is 0 to 50 mm, and the maximum bearing pressure is greater than 2.3 MPa, so that enough gas can be injected into the inner bladder, and the inner bladder can expand by 0 to 50 mm after inflation to squeeze the outer bladder.

[0012] In a second aspect, the present invention provides a blasthole water-isolating method applied to a blasthole water-isolating device for a water-rich fractured rock mass that can be recycled as described in any one of the first aspects, comprising the following steps:

[0013] S1: Prepare a reusable water-blocking device for blastholes in water-rich fractured rock mass based on the specifications of the blasthole;

[0014] S2: Fill the weight cavity with heavy objects;

[0015] S3: lowering a reusable water-isolating device for blastholes in water-rich fractured rock mass into the blastholes;

[0016] S4: inflating the inner bladder through the air valve, so that the inner bladder expands and squeezes the outer bladder to fit tightly against the wall of the blast hole, and stopping inflating the inner bladder when the air pressure displayed on the pressure gauge reaches a first air pressure value;

[0017] S5: Before charging the blast hole, the inner bladder is deflated and removed from the outer bladder.

[0018] By adopting the above steps, the outer capsule can isolate the fissure water in the rock mass, prevent the fissure water from seeping into the blasthole and destroying the blasthole structure, provide a good charging environment for blasting construction, allow the explosives to fully release energy, improve the ability of the explosives to work on the surrounding rock mass, ensure the blasting quality, and fundamentally solve the impact of water holes on blasting construction; the inner capsule can be used multiple times, which can solve the problem that the existing device is a disposable consumable and the cost of batch use is difficult to control.

[0019] Optionally, the weight filled in the counterweight cavity is 5-10kg, so that the water-proof device can fall to the bottom of the blasthole under the action of gravity; the first air pressure value is 0.3MPa~0.5MPa, which can ensure that the inner bag body expands and will not explode due to excessive air pressure.

[0020] Optionally, the diameter of the inner balloon in an uninflated state is The maximum diameter in the inflated state is When not inflated, the gap between the inner capsule and the borehole wall is where d 1 is the diameter of the blast hole, the expansion space of the inner capsule in Thereby achieving the function of the outer bladder being expanded and squeezed to fit closely with the wall of the blast hole.

[0021] Optionally, the pressure calculation formula of the inner capsule is: Where P 2 Represents the pressure of the inner capsule, P 1 represents the pressure of the inner bladder before inflation, Q represents the calculated flow rate of the inner bladder, L represents the length of the inner bladder, d represents the thickness of the inner bladder, ρ represents the gas density of the inner bladder inflation, Z represents the compression factor, T represents the open-type temperature during inflation, T 0 The representative Kelvin temperature is 273.15K; thus ensuring that the gas pressure of the inner capsule is within the appropriate range.

[0022] In summary, the present invention at least includes the following beneficial technical effects:

[0023] 1. The outer capsule in the water-isolating device can isolate the fissure water in the rock mass, prevent the fissure water from seeping into the blasthole and destroying the blasthole structure, provide a good charging environment for blasting construction, allow the explosives to fully release energy, improve the ability of the explosives to work on the surrounding rock mass, ensure the blasting quality, and fundamentally solve the impact of water holes on blasting construction; the inner capsule has a recyclable function, which can solve the problem that the existing device is a disposable consumable and the cost of batch use is difficult to control.

[0024] 2. By adopting a water-isolating device to implement a water-isolating method, it is possible to prevent the infiltration of fissure water in the blasthole, thereby ensuring the normal progress of blasting and reducing the cost of implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a working principle diagram of a blasthole water-isolating device for recycling in water-rich fractured rock mass according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Enlarged view of part A.

[0027] Figure 3 for Figure 1 Enlarged view of part B.

[0028] Figure 4 This is a diagram of the uninflated folded state of the water-isolating device for cyclic use of blastholes in water-rich fractured rock mass according to an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the degassing of the water-isolating device used for the blasthole in the water-rich fractured rock mass in the embodiment of the present invention;

[0030] Figure 6 It is a flow chart for implementing the water-isolating method in an embodiment of the present invention.

[0031] Explanation of the accompanying drawings: 1. outer bladder; 2. inner bladder; 3. air valve; 4. pressure gauge; 5. bladder diaphragm; 6. counterweight cavity; 7. first rope; 8. second rope. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The terms used in the following embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to be used as limitations of the present invention. As used in the specification of the present invention and the appended claims, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear contrary indication in its context. It should also be understood that the term "and / or" used in the present invention refers to and includes any or all possible combinations of one or more listed items. The term "exemplary" means "used as an example, embodiment or illustrative", and any embodiment described as "exemplary" here does not have to be interpreted as being superior to or better than other embodiments. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can expressly or implicitly include one or more of these features, and in the description of the embodiments of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0034] In a very large open-pit coal mine, the annual coal production is 30 million tons. The coal seam is buried 150 meters below the ground surface. The overlying rock and soil are peeled off from top to bottom in a step-by-step manner by drilling and blasting. The standard step height is 15 meters, the blasthole diameter is 152 mm, the extra-deep is 1 meter, the hole network parameter is 8m×5m, and the single blasting scale is about 180 blastholes. During the construction process, it was found that there was an aquifer between 75 meters and 105 meters below the ground surface. The fissure water exists in the rock mass, resulting in a large number of water-containing blastholes during construction, which seriously affects the blasting quality. Therefore, a recyclable water-isolating device and water-isolating method for blastholes in water-rich fractured rock mass are proposed.

[0035] refer to Figure 1 The embodiment of the present invention provides a recyclable water-isolating device for blastholes in water-rich fractured rock mass, comprising: an outer sac 1, an inner sac 2, an air valve 3 and a pressure gauge 4.

[0036] refer to Figure 1 and Figure 5The outer bladder 1 is made of plastic film, and is in the shape of a hollow cylinder with an opening at one end. The end of the outer bladder 1 with an opening is now defined as the top end, and the other end is defined as the bottom end. A bladder diaphragm 5 is provided on the inner side wall of the bottom end of the outer bladder 1, and a counterweight cavity 6 is formed between the bladder diaphragm 5 and the bottom end of the outer bladder 1. The counterweight cavity 6 can be filled with heavy objects such as rock cuttings and soil. The counterweight cavity 6 can withstand a gravity of 19.6N to 78.4N to ensure that the bottom end of the outer bladder 1 falls along the wall of the blast hole to the bottom of the blast hole and remains in a vertical state.

[0037] refer to Figure 4 The inner bladder 2 is made of rubber and has a certain elastic tension. The inner bladder 2 is in a hollow cylindrical shape. The outer bladder 1 is sleeved on the inner bladder through the opening. The air valve 3 is installed on one end of the inner bladder 2, and the air valve 3 is located at the opening of the outer bladder 1. The pressure gauge 4 is installed on the air valve 3. The air valve 3 can be used to inflate or deflate the inner bladder 2. After the inner bladder 2 is inflated, the outer bladder 1 can be pressed against the inner wall of the blast hole. The pressure gauge 4 is used to monitor the air pressure of the inner bladder 2 after it is inflated.

[0038] refer to Figure 2 and Figure 3 A first rope 7 is passed through the opening edge of the outer bladder 1. Tightening the first rope 7 can fix the outer bladder 1 to the inner bladder 2. By tightening or loosening the first rope 7, the outer bladder 1 can be disassembled and assembled. A second rope 8 is passed through the bottom of the outer bladder 1. After a weight is filled in the counterweight cavity 6, the bottom of the outer bladder 1 falls due to the gravity of the weight, and the second rope 8 can fix the weight.

[0039] Among them, the thickness of the outer capsule 1 is less than the thickness of the inner capsule 2. The thickness of the outer capsule 1 is between 0.3mm and 0.5mm, and is preferably 0.3mm in the embodiment of the present application. The tear strength of the outer capsule 1 is greater than 20kN / m. When the inner capsule 2 is in a non-inflated state, the outer capsule 1 can be disassembled and folded, and the inner capsule 2 and the outer capsule 1 can be rolled up together. When it fits the hole wall in the inflated state, it can resist the buoyancy of the outer capsule given by the fissure water penetrating along the hole wall into the bottom of the hole without being damaged by the rock of the hole wall. In the rock mass with relatively developed gaps, the outer capsule 1 can also resist the impact of the air pressure of the adjacent blasthole on the outer capsule 1 during perforation. The thickness of the inner capsule 2 is between 0.7mm and 1.8mm, and is preferably 1mm in the embodiment of the present application. The inner capsule 2 has strong toughness and wear resistance.

[0040] In the embodiment of the present application, according to the number of blastholes in the quasi-blasting area in the extra-large open-pit coal mine, the blasthole depth, the aperture size and other parameters, the length of the device is set to 16.5m, the diameter of the outer bladder 1 is set to 153mm, the collapsed diameter of the inner bladder 2 in the uninflated state is set to 108mm, and the length of the counterweight cavity 6 at the bottom of the outer bladder 1 is 10cm. Among them, the retractable diameter of the inner bladder 2 is between 0 and 50mm, the maximum bearing pressure of the inner bladder 2 is greater than 2.3MPa, and the tensile strength of the outer bladder 1 is greater than 20N.

[0041] The implementation principle of a reusable waterproofing device for blastholes in water-rich fractured rock mass provided by an embodiment of the present invention is as follows: when waterproofing the blastholes in water-rich fractured rock mass, firstly fill the counterweight cavity 6 with a heavy object, and fix the heavy object with a second rope 8, fix the top of the outer capsule 1 on the inner capsule 2 with a first rope 7, then put the outer capsule 1 and the inner capsule 2 into the blasthole, and then inflate the inner capsule 2 through the air valve 3, the inner capsule 2 expands and squeezes the outer capsule 1 to fit tightly against the wall of the blasthole, then the inner capsule 2 is deflated, and after deflation, the inner capsule 2 and the outer capsule 1 are separated from each other, then the first rope 7 is untied and the inner capsule 2 is taken out, and finally the outer capsule 1 can be filled with explosives. The outer capsule 1 can isolate the fissure water in the rock mass, prevent the fissure water from seeping into the blasthole and destroying the blasthole structure, provide a good charging environment for blasting construction, allow the explosives to fully release energy, enhance the ability of the explosives to work on the surrounding rock mass, ensure the blasting quality, and fundamentally solve the impact of water holes on blasting construction; the detachable inner capsule 2 (including the air valve and pressure gauge on the inner capsule) has the function of recyclability, which can solve the problem that the existing device is a disposable consumable and the cost of batch use is difficult to control.

[0042] The embodiment of the present invention also provides a blasthole water-isolating method.

[0043] refer to Figure 1 , Figure 5 and Figure 6 , a blasthole water-isolating method, comprising the following steps:

[0044] S1: Prepare blastholes for water-rich fractured rock mass based on blasthole specifications and reusable water-isolating devices.

[0045] First, according to the actual blasting situation, prepare the corresponding number and specifications of reusable water-isolating devices (hereinafter referred to as water-isolating devices) for blastholes in water-rich fractured rock mass, then transport the prepared water-isolating devices to the blasting site by vehicle, and place the water-isolating devices 1m to 1.5m near each blasthole to be drilled, so that the water-isolating devices can be placed in the blasthole immediately after the drilling is completed.

[0046] S2: Fill the counterweight cavity 6 with heavy objects.

[0047] After the drilling rig completes a single blasthole operation according to the designed hole depth, a 5-10 kg weight is immediately filled into the counterweight cavity 6. The weight can be granular rock cuttings, soil, or stones near the blasthole, and is not specifically limited. In the embodiment of the present application, 5 kg of granular rock cuttings are used to fill the counterweight cavity 6.

[0048] S3: The reusable water-isolating device for blastholes in water-rich fractured rock mass is lowered into the blasthole.

[0049] Since the counterweight cavity 6 at the bottom of the outer sac 1 is filled with heavy objects, the water-isolating device can be lowered into the blast hole by natural falling, and the water-isolating device can always remain in a vertical state during the lowering process. After lowering, the bottom end of the outer sac 1 contacts the bottom of the blast hole.

[0050] It should be understood that before lowering the water barrier, the outer bladder can be fixed to the inner bladder by the first rope 7, so as to prevent the inner and outer bladders from being separated from each other during lowering. The weight in the counterweight cavity 6 can be fixed by the second rope 8.

[0051] S4: Inflate the inner bladder 2 through the air valve 3, so that the inner bladder 2 expands and squeezes the outer bladder 1 to fit tightly against the wall of the blast hole, and stop inflating the inner bladder 2 when the air pressure displayed by the pressure gauge 4 reaches a first air pressure value.

[0052] The air compressor inflation tube of the drilling rig is connected to the air valve 3 on the inner bladder 2 to realize the inflation of the inner bladder 2, until the pressure pointer of the pressure gauge 4 rotates to 0.3MPa~0.5MPa (that is, the first air pressure value), and the outer bladder 1 is observed with the naked eye to see whether it is completely in contact with the wall of the blast hole, and the outer bladder 1 is pressed hard by hand. If the outer bladder 1 is completely in contact with the wall of the blast hole and there is no obvious depression, the inflation is stopped and the inflation tube is unplugged, and the air valve 3 is tightened with a cap to prevent gas leakage. It should be understood that the pressure needs to be determined according to the contact between the outer bladder 1 and the wall of the blast hole. In the embodiment of the present application, it is preferred to determine whether to stop inflation at 0.5MPa.

[0053] Specifically, if the diameter of the inner balloon 2 in the uninflated state is The maximum diameter in the inflated state is When not inflated, the gap between the inner capsule 2 and the hole wall of the blast hole 9 is where d 1 is the diameter of the blast hole 9. The expansion space of the inner capsule 2 in This ensures that the inner bladder 2 has the ability to shrink after the internal gas is discharged, so that the inner bladder 2 is separated from the outer bladder 1, and the inner bladder 2 is taken out for subsequent water-proof reuse.

[0054] The pressure calculation formula of the inner capsule 2 is: Where P 2 represents the final pressure of the inner capsule 2, in kPa; P 1 represents the pressure of the inner bladder 2 before inflation, in kPa; Q represents the calculated flow rate of the inner bladder 2, in m 3 / h; L represents the length of the inner bladder 2, in km; d represents the thickness of the inner bladder 2, in mm; ρ represents the gas density of the inner bladder 2, in kg / m 3 , usually the air density is 1.29kg / m 3 ; Z represents the compression factor, which is 1 when the pressure of the inner bladder 2 is less than 1.2 MPa (gauge pressure); T represents the open temperature during inflation; T 0 The representative Kelvin temperature is 273.15 K. By calculating the pressure in the inner bladder 2, the accuracy of the inflation amount can be improved.

[0055] S5: Before charging the blast hole, the inner bladder 2 is deflated and the inner bladder 2 is taken out from the outer bladder 1.

[0056] 30 minutes before charging the blasthole, untie the first rope 7 to separate the inner bladder 2 and the outer bladder 1. Then unscrew the air valve 3 to deflate the inner bladder 2, and wait until the pressure pointer of the pressure gauge 4 rotates to about 0 scale. At this time, the diameter of the inner bladder 2 returns to its original size, and the inner bladder 2 is separated from the outer bladder 1, and the inner bladder 2 can be pulled out. After that, the inner bladder 2 is folded into a layer and placed at the edge of the blasthole so that the staff can collect it for subsequent reuse. The outer bladder 1 remains in the blasthole to prevent the surrounding fissure water from filling into the blasthole.

[0057] S6: Loading explosives into the outer capsule 1.

[0058] The charging personnel loads explosives into the outer capsule 1 and completes the subsequent blasting work according to the process.

[0059] During the implementation of the above-mentioned water-isolating method, the outer capsule 1 can isolate the fissure water in the rock mass, prevent the fissure water from seeping into the blasthole and destroying the blasthole structure, provide a good charging environment for blasting construction, allow the explosives to fully release energy, enhance the ability of the explosives to work on the surrounding rock mass, ensure the blasting quality, and fundamentally solve the impact of water holes on blasting construction; the inner capsule 2 has a recyclable function, which can solve the problem that the existing device is a disposable consumable and the cost of batch use is difficult to control.

[0060] As described above, the above embodiments are only used to introduce the technical solution of the present invention in detail, but the description of the above embodiments is only used to help understand the method and core idea of ​​the present invention and should not be understood as limiting the present invention. Changes or substitutions that can be easily thought of by technicians in this technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A recyclable water-isolating device for blastholes in water-rich fractured rock mass, characterized in that: include: An outer bladder (1), an inner bladder (2), an air valve (3) and a pressure gauge (4); one end of the outer bladder (1) has an opening, the outer bladder (1) is sleeved on the inner bladder (2) through the opening, the air valve (3) is mounted on the inner bladder (2), and the pressure gauge (4) is mounted on the air valve (3); a bladder diaphragm (5) is provided on the inner side wall of the end of the outer bladder (1) away from the opening, a counterweight cavity (6) for filling with a heavy object is formed between the bladder diaphragm (5) and the end of the outer bladder (1) away from the opening, and after the gas is injected into the inner bladder (2), the outer bladder (1) can be squeezed to fit tightly with the wall of the blast hole (9).

2. A blasthole recyclable water-isolating device for water-rich fractured rock mass as claimed in claim 1, characterized in that: A first rope (7) is arranged at the edge of the opening of the outer sac (1), and a second rope (8) is arranged at an end of the outer sac (1) away from the opening.

3. A blasthole recyclable water-isolating device for water-rich fractured rock mass as claimed in claim 1 or 2, characterized in that: The thickness of the outer capsule (1) is smaller than the thickness of the inner capsule (2).

4. A blasthole recyclable water-isolating device for water-rich fractured rock mass as claimed in claim 3, characterized in that: The thickness of the outer capsule (1) is 0.3 mm to 0.5 mm, and the thickness of the inner capsule (2) is 0.7 mm to 1.8 mm.

5. A blasthole recyclable water-isolating device for water-rich fractured rock mass as claimed in claim 2 or 4, characterized in that: The outer capsule (1) has a tearing strength greater than 20 kN / m and a tensile strength greater than 20N.

6. A blasthole recyclable water-isolating device for water-rich fractured rock mass as claimed in claim 2 or 4, characterized in that: The retractable diameter of the inner capsule (2) is 0-50 mm, and the maximum bearing pressure is greater than 2.3 MPa.

7. A blasthole water-isolating method applied to a blasthole water-isolating device for water-rich fractured rock mass as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1: preparing a blasthole (9) for a water-rich fractured rock mass based on the specifications of the blasthole (9) and a recyclable water-isolating device; S2: Filling the counterweight cavity (6) with a weight; S3: lowering a reusable water-isolating device for a blasthole (9) for a water-rich fractured rock mass into the blasthole (9); S4: inflating the inner bladder (2) through the air valve (3) so that the inner bladder (2) expands and squeezes the outer bladder (1) to fit tightly against the wall of the blast hole (9), and stopping inflating the inner bladder (2) when the air pressure displayed by the pressure gauge (4) reaches a first air pressure value; S5: Before charging the blast hole (9), the inner bladder (2) is deflated and the inner bladder (2) is taken out from the outer bladder (1).

8. The blasthole water-isolating method according to claim 7, characterized in that: The weight filled in the counterweight cavity (6) is 5 to 10 kg, and the first air pressure value is 0.3 MPa to 0.5 MPa.

9. The blasthole water-isolating method according to claim 7, characterized in that: The diameter of the inner bladder (2) in the uninflated state is The maximum diameter in the inflated state is When not inflated, the gap between the inner bladder (2) and the hole wall of the blast hole (9) is Where d1 is the diameter of the blast hole (9), the expansion space of the inner capsule (2) in 10. The blasthole water-isolating method according to claim 7 or 9, characterized in that: The pressure calculation formula of the inner capsule is: Wherein P2 represents the pressure of the inner capsule (2), P1 represents the pressure of the inner capsule (2) before inflation, Q represents the calculated flow rate of the inner capsule (2), L represents the length of the inner capsule (2), d represents the thickness of the inner capsule (2), ρ represents the gas density of the inner capsule (2) when inflated, Z represents the compression factor, T represents the Kelvin temperature during inflation, and T0 represents the Kelvin temperature of 273.15K.

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