Water-rich area drilling blasting vibration reduction method

Abstract

The embodiment of the invention discloses a vibration reduction method for drilling blasting in a water-rich area, and relates to but is not limited to a blasting technology. The water-rich area drilling blasting vibration reduction method comprises the steps that a vibration reduction hole set is formed in a propagation path of blasting stress incident waves propagating from a blasting excavation area to a protected object, the blasting excavation area is separated from the protected object, and the vibration reduction hole set comprises a plurality of vibration reduction holes; and introducing air into the plurality of vibration reduction holes respectively. In this way, the original water-filled state of the vibration reduction holes can be changed, and the air content of the vibration reduction holes is increased. By means of the characteristic that the stress intensity isolation capacity of air is high, propagation of blasting stress incident waves propagating from a blasting excavation area to a protected object can be effectively hindered, damage to the protected object caused by blasting of the blasting excavation area is avoided, and the vibration reduction effect is similar to that of a land waterless area.

Description

Technical Field

[0001] The present disclosure relates to but is not limited to blasting technology, and in particular to a vibration reduction method for drilling and blasting in water-rich areas. Background Art

[0002] When blasting and excavation are carried out in water-rich areas such as ports or docks under complex environments, the blasting vibration needs to be controlled to prevent the blasting from damaging the protected objects. In order to speed up the construction progress, the blasting cannot be carried out by reducing the blasting scale and the amount of single-stage explosives. It is necessary to arrange vibration reduction holes on the propagation path of the blasting stress incident wave for vibration reduction.

[0003] Different from the vibration reduction holes in the conventional area, the vibration reduction holes in the water-rich area are filled with water, which has poor obstruction to the incident waves of blasting stress. Summary of the invention

[0004] The embodiment of the present disclosure provides a method for reducing vibration during drilling and blasting in a water-rich area, comprising: A vibration reduction hole group is provided in a propagation path of a blasting stress incident wave propagating from a blasting excavation area to a protected object, so as to separate the blasting excavation area from the protected object, wherein the vibration reduction hole group includes a plurality of vibration reduction holes; and Air is introduced into the plurality of vibration-damping holes respectively.

[0005] In some embodiments of the method for reducing vibration during drilling and blasting in water-rich areas, the step of introducing air into the plurality of vibration reduction holes comprises: A pipeline is arranged in the vibration reduction hole, and the pipeline has a plurality of air outlet holes arranged near the bottom of the vibration reduction hole; Compressed air is introduced into the pipeline and discharged into the vibration-damping holes from the plurality of air outlet holes.

[0006] In some embodiments of the method for vibration reduction in drilling and blasting in water-rich areas, one end of the pipeline close to the bottom of the vibration reduction hole is sealed, the multiple air outlet holes are arranged in the circumference of the pipeline and penetrate the pipeline in the radial direction of the pipeline, and the multiple air outlet holes are distributed at intervals along the axial direction of the pipeline.

[0007] In some embodiments of the method for reducing vibration during drilling and blasting in water-rich areas, the pressure of the compressed air is greater than or equal to the hydrostatic pressure at the bottom of the vibration reduction hole.

[0008] In some embodiments of the method for reducing vibration during drilling and blasting in water-rich areas, the diameter of the pipeline is 25 mm to 35 mm; and / or The diameter of the air outlet hole is 3 mm to 7 mm.

[0009] In some embodiments of the method for reducing vibration during drilling and blasting in water-rich areas, the material of the pipeline is PVC; and / or The compressed air is generated by an air compressor having the vibration reduction hole.

[0010] In some embodiments of the method for vibration reduction in drilling and blasting in water-rich areas, the ratio of the distance from the blasting excavation area along the propagation path to the vibration reduction hole group to the distance from the vibration reduction hole group along the propagation path to the protected object is 0.4 to 0.6.

[0011] In some embodiments of the method for vibration reduction in drilling and blasting in water-rich areas, there are multiple vibration reduction hole groups, and the multiple vibration reduction hole groups are arranged in sequence along the propagation path.

[0012] In some embodiments of the method for reducing vibration by drilling and blasting in water-rich areas, the diameter of the vibration reduction hole is consistent with the diameter of the blasting hole opened in the blasting excavation area; The spacing between adjacent vibration-damping holes in each vibration-damping hole group is 3 to 5 times the diameter of the vibration-damping holes; The spacing between adjacent groups of vibration-damping holes is 0.5 to 1.5 times the diameter of the vibration-damping holes.

[0013] In some embodiments of the method for reducing vibration during drilling and blasting in water-rich areas, the bottom of the vibration reduction hole is placed outside the propagation path.

[0014] The method for vibration reduction in drilling and blasting in water-rich areas of the disclosed embodiment includes opening a vibration reduction hole group in the propagation path of the blasting stress incident wave propagating from the blasting excavation area to the protected object, separating the blasting excavation area from the protected object, the vibration reduction hole group includes a plurality of vibration reduction holes; and respectively introducing air into the plurality of vibration reduction holes. In this way, the original state of the vibration reduction holes being filled with water can be changed, and the air content of the vibration reduction holes can be increased. By utilizing the strong ability of air to isolate stress intensity, the propagation of the blasting stress incident wave propagating from the blasting excavation area to the protected object can be effectively hindered, and the damage to the protected object caused by blasting in the blasting excavation area can be avoided. The vibration reduction effect is similar to that of the waterless area on land.

[0015] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. Other advantages of the present disclosure can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure.

[0017] Figure 1 It is a schematic flow chart of a method for reducing vibration in drilling and blasting in a water-rich area according to an embodiment of the present disclosure; Figure 2 It is a schematic diagram of the wave transmission and reflection of the blasting stress incident wave in the embodiment of the present disclosure; Figure 3 Schematic diagram of the plane layout of the vibration reduction holes in the embodiment of the present disclosure; Figure 4 is a schematic diagram of the arrangement of the vibration-damping holes in the depth direction in an embodiment of the present disclosure; Figure 5 It is a partial schematic diagram of the position of the vibration-damping hole in the embodiment of the present disclosure.

[0018] Description of Figure Numbers: 10. Blasting excavation area; 20. Protected object; 30. Transmission path; 40. Pipeline; 100. Vibration reduction hole; 200. Air outlet hole; 300. Bubble. DETAILED DESCRIPTION

[0019] The present disclosure describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present disclosure. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0020] The present disclosure includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features, and elements of the present disclosure may also be combined with any conventional features or elements to form a unique invention scheme. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme. Therefore, it should be understood that any feature shown and / or discussed in the present disclosure may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0021] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described in the present disclosure, the method or process should not be limited to the steps in the specific order described. As will be understood by those of ordinary skill in the art, other orders of steps are also possible. Therefore, the specific order of the steps set forth in the specification should not be interpreted as a limitation on the claims. In addition, the claims for the method and / or process should not be limited to the steps performed in the order written, and those skilled in the art can easily understand that these orders can be changed and still remain within the spirit and scope of the embodiments of the present disclosure.

[0022] When blasting and excavation are carried out in water-rich areas such as ports or docks under complex environments, the blasting vibration needs to be controlled to prevent the blasting from damaging the protected objects. In order to speed up the construction progress, the blasting cannot be carried out by reducing the blasting scale and the amount of single-stage explosives. It is necessary to arrange vibration reduction holes on the propagation path of the blasting stress incident wave for vibration reduction.

[0023] Different from the vibration reduction holes in the conventional area, the vibration reduction holes in the water-rich area are filled with water, which has poor obstruction to the incident waves of blasting stress.

[0024] Please combine Figures 1 to 4 In an embodiment of the present disclosure, a method for reducing vibration during drilling and blasting in a water-rich area is disclosed, comprising: S1, opening a vibration reduction hole group in the propagation path 30 of the blasting stress incident wave I propagating from the blasting excavation area 10 to the protected object 20, separating the blasting excavation area 10 from the protected object 20, the vibration reduction hole group including a plurality of vibration reduction holes 100; and S2. Introduce air into the plurality of vibration-damping holes 100 respectively.

[0025] Based on the transflection theory of wave mechanics, when an elastic wave is transmitted from one medium to another, transmission and reflection phenomena will occur at the interface of the media. The intensity of the transmitted wave T and the reflected wave R is related to the wave impedance of medium a and medium b, and satisfies the following formula: Among them, ρ a is the density of medium a, ρ b is the density of medium b, (Cp) a is the longitudinal wave velocity of medium a, (Cp) b is the longitudinal wave velocity of medium b, ρ a (Cp) a is the wave impedance of medium a, ρ b (Cp) b is the wave impedance of medium b.

[0026] Under standard conditions, the density of water is 1000kg / m 3 , the wave speed of water is 1500m / s, and the wave impedance of water is 1.5×10 6 kg / m 3 m / s; The density of air is 1.29 kg / m 3 , the wave speed of air is 344m / s, and the wave impedance of air is 4.44×10 2 kg / m 3 ·m / s. The wave impedance of water is 3380 times that of air.

[0027] Assume that the rock mass of the blasting excavation area 10 is dense granite, and the density of dense granite is 2600kg / m 3 Up to 3000kg / m 3 , take the median value of 2800kg / m 3 , the wave velocity of dense granite is 5000kg / m 3 to 7000m / s, taking the median value of 6000m / s, the wave impedance of dense granite is 1.68×10 7 kg / m 3 m / s.

[0028] According to the above formula, when dense granite is blasted and excavated, the intensity of the transmitted wave T is about 0 when facing the air surface, and is only 16% of the intensity of the incident wave I when facing the water surface. This shows that due to the small wave impedance of air, the ability of air to isolate stress intensity is strong.

[0029] The vibration reduction method for drilling and blasting in water-rich areas of the disclosed embodiment includes opening a vibration reduction hole group in the propagation path 30 of the blasting stress incident wave I propagating from the blasting excavation area 10 to the protected object 20, separating the blasting excavation area 10 from the protected object 20, and the vibration reduction hole group includes a plurality of vibration reduction holes 100; and respectively introducing air into the plurality of vibration reduction holes 100. In this way, the original state of the vibration reduction holes 100 being filled with water can be changed, and the air content of the vibration reduction holes 100 can be increased. By utilizing the strong ability of air to isolate stress intensity, the propagation of the blasting stress incident wave I propagating from the blasting excavation area 10 to the protected object 20 can be effectively hindered, and the damage to the protected object 20 caused by blasting in the blasting excavation area 10 can be avoided. The vibration reduction effect is similar to that of the land waterless area.

[0030] In an exemplary embodiment, if Figure 5 As shown, air is introduced into the plurality of vibration-damping holes 100 respectively, including: A pipeline 40 is disposed in the vibration-damping hole 100 , and the pipeline 40 has a plurality of air outlet holes 200 disposed near the bottom of the vibration-damping hole 100 .

[0031] Compressed air is introduced into the pipeline 40 and discharged into the vibration-damping holes 100 from the plurality of air outlet holes 200 .

[0032] In this way, the compressed air can be introduced into the bottom of the vibration damping hole 100 through the setting of the air outlet hole 200, so that the air can be relatively evenly distributed in the entire vibration damping hole 100, increasing the air content in the vibration damping hole 100, thereby improving the ability of the vibration damping hole 100 to hinder the incident wave I of the blasting stress.

[0033] By introducing compressed air into the pipeline 40 , the air has a certain pressure, which can resist the water pressure and ensure that the air can be discharged into the vibration reduction hole 100 smoothly.

[0034] In an exemplary embodiment, if Figure 5 As shown, one end of the pipeline 40 close to the bottom of the vibration reduction hole 100 is sealed. This can reduce the impact of air-driven water on the bottom of the vibration reduction hole 100, reduce the stirring of the soil, reduce the risk of clogging of the air outlet 200, and ensure that the air can be discharged smoothly from the air outlet 200. In addition, avoiding the air outlet 200 being opened near the bottom of the vibration reduction hole 100 on the pipeline 40 can also reduce exhaust resistance, reduce the driving force for driving compressed air, and achieve energy saving effect.

[0035] A plurality of air outlet holes 200 are arranged in the circumferential direction of the pipeline 40 and penetrate the pipeline 40 in the radial direction of the pipeline 40, and the plurality of air outlet holes 200 are spaced apart along the axial direction of the pipeline 40. This makes the air discharge more uniform, thereby making the air distribution in the vibration-damping hole 100 more uniform. In addition, the plurality of vibration-damping holes 100 are at different distances from the bottom of the vibration-damping hole 100, thereby reducing the risk of the plurality of vibration-damping holes 100 being blocked at the same time.

[0036] In an exemplary embodiment, the pressure of the compressed air is greater than or equal to the hydrostatic pressure at the bottom of the vibration reduction hole 100. This ensures that the air can be discharged smoothly into the vibration reduction hole 100. The hydrostatic pressure at the bottom of the vibration reduction hole 100 can be measured in advance, and the pressure of the compressed air can be determined based on the measurement result, so that the air can be discharged smoothly into the vibration reduction hole 100 while minimizing the energy consumption of introducing compressed air. After the dense bubbles 300 are continuously discharged from the vibration reduction hole 100, it means that the preparation of the vibration reduction hole 100 is completed, and the introduction of air can be stopped after the detonation is completed.

[0037] In an exemplary embodiment, the diameter of the pipe 40 may be about 25 mm to 35 mm. For example, the diameter of the pipe 40 may be about 30 mm.

[0038] In an exemplary embodiment, the diameter of the air outlet 200 may be about 3 mm to 7 mm. For example, the diameter of the air outlet 200 may be about 5 mm. In the embodiment of the present disclosure, the plurality of air outlets 200 can form three to four air outlet groups, and the air outlets 200 in each air outlet group are evenly distributed around the axis of the tube body. The spacing between two adjacent air outlet groups along the axial direction of the tube body is about 2 times the diameter of the air outlet 200. The cross-sectional shape of the air outlet 200 may be, but is not limited to, a triangle, a rectangle, a circle, or the like.

[0039] In an exemplary embodiment, the material of the pipe 40 is PVC (polyvinyl chloride), which is cheap and easy to obtain, and the opening of the air outlet 200 is relatively simple, which can further reduce costs. Compressed air is generated by an air compressor with a vibration reduction hole 100, without the need to purchase additional equipment. This can further reduce costs, so that the increased costs are mainly concentrated on the opening of the vibration reduction hole 100.

[0040] In the exemplary embodiment, please combine Figure 2 and Figure 3 , the ratio of the distance from the blasting excavation area 10 along the propagation path 30 to the vibration damping hole group to the distance from the vibration damping hole group to the protected object 20 along the propagation path 30 can be about 0.4 to 0.6. For example, the ratio of the distance from the blasting excavation area 10 along the propagation path 30 to the vibration damping hole group to the distance from the vibration damping hole group to the protected object 20 along the propagation path 30 can be about 0.5. In this way, the vibration damping hole group has a better blocking effect on the blasting stress incident wave I, and the number of vibration damping holes 100 in the vibration damping hole group is small, which saves cost and is economical.

[0041] In an exemplary embodiment, please continue to refer to Figure 2 and Figure 3 , the number of vibration reduction hole groups is multiple, and the multiple vibration reduction hole groups are sequentially arranged along the propagation path 30. In this way, by setting up multiple vibration reduction hole groups, multiple effects of hindering the blasting stress incident wave I can be formed between the blasting excavation area 10 and the protected object 20, thereby improving the hindering effect on the blasting stress incident wave I. In the propagation direction of the blasting stress incident wave I, the vibration reduction holes 100 in the latter vibration reduction hole group can be set corresponding to the gap between the adjacent vibration reduction holes 100 in the former vibration reduction hole group. In the embodiment of the present disclosure, the number of vibration reduction hole groups is two. Figure 2 As shown, the vibration reduction holes 100 are in a plane, and at least part of the vibration reduction holes 100 or at least part of the vibration reduction holes 100 are located outside the propagation path 30 of the blasting stress incident wave I, further ensuring the blocking effect on the blasting stress incident wave I. In the embodiment of the present disclosure, the two outermost vibration reduction holes 100 of the vibration reduction hole group arranged near the blasting excavation area 10 are partially located outside the propagation path 30 of the blasting stress incident wave I. The cross-sectional shape of the vibration reduction hole 100 can be, but is not limited to, a triangle, a rectangle, a circle, etc.

[0042] like Figure 3 As shown, the bottom of the vibration reduction hole 100 is placed outside the propagation path 30. This can further ensure the blocking effect on the blasting stress incident wave I, so that the blasting stress incident wave I has a better blocking effect in both the horizontal direction and the vertical direction.

[0043] In an exemplary embodiment, the diameter of the vibration reduction hole 100 is consistent with the diameter of the blasting hole 300 opened in the blasting excavation area 10, which can reduce the process of adjusting the drilling hole diameter and enable the same drilling tool to complete the opening of the blasting hole 300 and the vibration reduction hole 100, saving costs and construction time.

[0044] The spacing between adjacent vibration-damping holes 100 in each vibration-damping hole group may be approximately 3 to 5 times the diameter of the vibration-damping hole 100. For example, the spacing between adjacent vibration-damping holes 100 in each vibration-damping hole group may be approximately 4 times the diameter of the vibration-damping hole 100.

[0045] The spacing between adjacent groups of vibration-damping holes may be approximately 0.5 to 1.5 times the diameter of the vibration-damping hole 100. For example, the spacing between adjacent groups of vibration-damping holes may be approximately 1 times the diameter of the vibration-damping hole 100.

[0046] In the description of the present disclosure, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0047] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include at least one of the features.

[0048] In the description of the present disclosure, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0050] In the present disclosure, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0052] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A method for reducing vibration during drilling and blasting in water-rich areas, characterized in that: include: A vibration reduction hole group is opened in the propagation path of the blasting stress incident wave propagating from the blasting excavation area to the protected object, so as to separate the blasting excavation area from the protected object, wherein the vibration reduction hole group includes a plurality of vibration reduction holes; and Air is introduced into the plurality of vibration-damping holes respectively.

2. The method for reducing vibration during drilling and blasting in water-rich areas according to claim 1, characterized in that: The step of respectively introducing air into the plurality of vibration-damping holes comprises: A pipeline is arranged in the vibration reduction hole, and the pipeline has a plurality of air outlet holes arranged near the bottom of the vibration reduction hole; Compressed air is introduced into the pipeline and discharged into the vibration-damping holes from the plurality of air outlet holes.

3. The method for reducing vibration during drilling and blasting in water-rich areas according to claim 2, characterized in that: One end of the pipeline close to the bottom of the vibration reduction hole is sealed, the multiple air outlet holes are arranged in the circumference of the pipeline and penetrate the pipeline in the radial direction of the pipeline, and the multiple air outlet holes are distributed at intervals along the axial direction of the pipeline.

4. The method for reducing vibration during drilling and blasting in water-rich areas according to claim 3, characterized in that: The pressure of the compressed air is greater than or equal to the hydrostatic pressure at the bottom of the vibration-damping hole.

5. The method for reducing vibration during drilling and blasting in water-rich areas according to any one of claims 2 to 4, characterized in that: The diameter of the pipeline is 25mm to 35mm; and / or The diameter of the air outlet is 3 mm to 7 mm.

6. The method for reducing vibration during drilling and blasting in water-rich areas according to claim 2, characterized in that: The material of the pipeline is PVC; and / or The compressed air is generated by an air compressor having the vibration reduction hole.

7. The method for reducing vibration during drilling and blasting in water-rich areas according to claim 1, characterized in that: The ratio of the distance from the blasting excavation area along the propagation path to the vibration reduction hole group to the distance from the vibration reduction hole group along the propagation path to the protected object is 0.4 to 0.

6.

8. The method for reducing vibration during drilling and blasting in water-rich areas according to claim 7, characterized in that: There are multiple vibration-damping hole groups, and the multiple vibration-damping hole groups are arranged in sequence along the propagation path.

9. The method for reducing vibration during drilling and blasting in water-rich areas according to claim 8, characterized in that: The diameter of the vibration reduction hole is consistent with the diameter of the blasting hole opened in the blasting excavation area; The spacing between adjacent vibration-damping holes in each vibration-damping hole group is 3 to 5 times the diameter of the vibration-damping holes; The spacing between adjacent groups of vibration-damping holes is 0.5 to 1.5 times the diameter of the vibration-damping holes.

10. The method for reducing vibration during drilling and blasting in water-rich areas according to any one of claims 7 to 9, characterized in that: The bottom of the vibration-damping hole is located outside the propagation path.

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