CN218180243U - Long-term nuclear explosion load simulation device of shallow-buried structure - Google Patents
Long-term nuclear explosion load simulation device of shallow-buried structure Download PDFInfo
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- CN218180243U CN218180243U CN202221008285.XU CN202221008285U CN218180243U CN 218180243 U CN218180243 U CN 218180243U CN 202221008285 U CN202221008285 U CN 202221008285U CN 218180243 U CN218180243 U CN 218180243U
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Abstract
The invention relates to a long-time nuclear explosion load simulation device with a shallow buried structure, which comprises a model to be tested, an explosion pit, a cover plate and explosives, wherein the bottom of the model to be tested is fixedly connected with the bottom of the explosion pit, so that the model to be tested forms a channel structure with openings at two ends, the openings at two ends of the channel structure are provided with baffle plates, so that a closed space is formed inside the model to be tested, a sand medium layer is filled at the lower part of the explosion pit, and the top height of the model to be tested is lower than the top height of the sand medium layer; a steel cable is arranged in the blasting pit, is positioned above the sand medium layer and is respectively fixed on two side walls of the blasting pit at two ends; the explosives are uniformly arranged on the steel cable; the cover plate is arranged at the top of the explosion pit, and a closed space is formed in the explosion pit, so that the device can realize the dynamic response test of the structure under the action of the explosion load of the nuclear weapon with longer duration, and the problem of lack of research means of the dynamic response test of the shallow buried structure under the action of the nuclear shock wave during long-term operation is solved.
Description
Technical Field
The invention relates to a long-term nuclear explosion load simulation device for a shallow-buried structure, and belongs to the field of dynamic response testing of underground structures.
Background
The protection project can resist the destructive effect of a preset weapon, has irreplaceable effects in the aspects of strengthening national defense, resisting invasion and the like, particularly underground protection project (tunnel type protection project), is buried at a certain depth below the ground, has the characteristics of strong natural resistance and easy camouflage and concealment, takes a straight-wall circular arch structure as an example, and has the advantages that the superior bearing capacity is widely applied to the underground protection project at present, the structural response of the protection structure under the nuclear explosion load in long-term is greatly different from the structural response under the explosion load with short duration, and the nuclear weapon destructive effect of the underground protection project is always a hot point of research in various countries in the world.
At present, nuclear explosion loading, shock tube loading, static pressure loading and other modes are mainly used for a structural nuclear explosion load resistance performance test mode, the nuclear explosion loading can not be achieved obviously at present, the shock tube loading is limited by size and pressure values and is only suitable for small-size model tests, and the static pressure loading mode and the nuclear explosion shock wave loading mode are too different and can not well reflect the loaded characteristics of a protective structure.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a test method for simulating the action of an explosion load on a shallow buried structure during long-term holding, so as to realize the dynamic response test of the structure under the action of the explosion load of a nuclear weapon with longer duration and solve the problem of lack of research means of the dynamic response test of the shallow buried structure under the action of a nuclear shock wave during long-term holding.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a long-time nuclear explosion load simulation device with a shallow-buried structure comprises a model to be tested, an explosion pit, a cover plate and explosives, wherein the bottom of the model to be tested is fixedly connected with the bottom of the explosion pit, so that the model to be tested forms a channel structure with openings at two ends, the openings at two ends of the channel structure are provided with baffle plates, so that a closed space is formed inside the model to be tested, a sand medium layer is filled at the lower part of the explosion pit, and the top height of the model to be tested is lower than the top height of the sand medium layer; a steel cable is arranged in the blasting pit and is positioned above the sand medium layer, and two ends of the steel cable are respectively fixed on two side walls of the blasting pit; the explosives are uniformly arranged on the steel cable; the cover plate is arranged at the top of the explosion pit, and a closed space is formed inside the explosion pit.
The technical scheme is further designed as follows: the bottom of the explosion pit is provided with a concrete cushion, and the bottom of the model to be tested is fixed on the concrete cushion.
The model bottom that awaits measuring is through right angle connecting plate fixed connection on the concrete cushion, the both sides of right angle connecting plate laminate with a model side and the concrete cushion that awaits measuring respectively, all are equipped with the through-hole on the both sides of right angle connecting plate, and the right angle connecting plate is through wearing to establish crab-bolt and the model and the concrete cushion fixed connection that await measuring in the through-hole.
Step surfaces which are symmetrically arranged are arranged at the top of the blast pit wall, and the edge of the cover plate is supported at the bottom of the step surfaces.
The inner side of the bottom of the step surface is provided with a rubber pad, and the rubber pad is in contact with the cover plate.
An electromagnet is arranged at the bottom of the step surface, and the cover plate is a steel plate.
The top of the cover plate is provided with a lifting hook
The model to be measured is of an arch structure, and the inner side of the model to be measured is enclosed by a baffle and a concrete cushion layer to form a closed space.
And a surface pressure sensor is arranged on the surface of the sand medium layer, and a soil pressure box is arranged on the outer surface of the model to be tested.
The steel cables are arranged in a criss-cross mode and are uniformly distributed in a plane parallel to the top surface of the sand medium layer; the inner wall of the explosion pit is provided with a fixing ring, and the steel cable is fixed on the fixing ring.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention adopts the technical scheme that explosives are uniformly distributed in an explosion space, and the shock wave and high-pressure gas generated by explosion of the detonating cord uniformly act on the sand surface, thereby better realizing the plane loading mode of the protection structure struck by nuclear explosion.
In the large-scale closed explosion pit environment, high-pressure gas generated by chemical explosion is sealed in the explosion cavity, so that the action time of explosion load is greatly prolonged, and the problem that the characteristic of nuclear explosion impact wavelength duration is difficult to realize is solved.
The invention integrally places the model in the sand medium, and can better simulate the shallow buried test condition of the structure.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of a connection structure between the blast pit wall and the cover plate in FIG. 1;
fig. 4 is a schematic structural diagram of a joint of the model to be tested and the concrete cushion in fig. 1.
In the figure: 1-blasting pit, 11-concrete cushion, 12-step surface, 13-rubber cushion, 14-electromagnet, 2-model to be tested, 21-right-angle connecting plate, 22-anchor bolt, 23-baffle, 3-sand medium layer, 4-steel cable, 5-explosive, 6-cover plate and 61-lifting hook.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Example one
As shown in fig. 1, the long-term nuclear explosion load simulation device with a shallow buried structure in the embodiment includes a rectangular explosion pit 1, a side wall of the explosion pit 1 is formed by pouring concrete, a concrete cushion 11 is arranged at the bottom of the explosion pit 1, a model 2 to be tested is in an arch shape, bottoms of two sides of the arch shape are fixedly connected with the concrete cushion 11 through right-angle connecting plates 21, two sides of each right-angle connecting plate 21 are respectively attached to the bottom of one side of the model 2 to be tested and the concrete cushion 11, as shown in fig. 4, through holes are arranged on two sides of each right-angle connecting plate 21, and the right-angle connecting plates 21 are anchored on the model 2 to be tested and the concrete cushion 11 after passing through the through holes through anchor bolts 22 to realize fixed connection; if the model 2 is made of steel plate, one side of the right-angle connecting plate 21 can be welded to the model 2, and the other side is fixed to the concrete cushion 11 by an anchor bolt.
As shown in fig. 2, after the model 2 to be tested is fixed in the explosion pit 1, the sand medium is filled into the explosion pit 1, in order to prevent sand from entering the inner side of the model 2 to be tested, the baffles 23 are arranged at the two ends of the model 2 to be tested, the sand medium is filled until the model 2 to be tested is completely submerged, a certain distance exists between the top surface of the sand medium and the top of the model 2 to be tested, the shallow-buried test condition is better simulated, a sand medium layer 3 is formed, and the baffles 23 are supported at the two ends of the model 2 to be tested under the pressure of the sand medium layer 3, so that a closed space is formed inside the model 2 to be tested.
A plurality of criss-cross steel cables 4 are arranged on the upper portion of the blasting pit 1 in the same plane, the steel cables 4 are evenly distributed in a plane parallel to the top surface of the sand medium layer 2, and the plane is located above the sand medium layer; both ends of each steel cable 4 are fixedly connected with two opposite side walls of the blasting pit 1, in order to install and detach the steel cables 4 more conveniently in the embodiment, fixing rings (not shown in the figure) are fixedly arranged at corresponding positions on the side walls of the blasting pit 2, and the end parts of the steel cables 4 are tied on the fixing rings; explosives 5 are uniformly arranged on the steel cable 4, and in the embodiment, linear hexogen is adopted.
Referring to fig. 3, the top of the explosion pit 1 is provided with symmetrically arranged step surfaces 12 and covers the cover plate 6, and the top of the cover plate 6 is provided with a lifting hook 61, so that the cover plate 6 can be conveniently lifted.
The edge of the cover plate 6 is supported at the bottom of the step surface 12, and the step surface 12 is used for positioning the cover plate 6; the rubber pad 13 is arranged on the inner side of the bottom of the step surface 12, the top surface of the rubber pad 13 is higher than the bottom of the step surface 12, the rubber pad 13 is in contact with the bottom of the cover plate 6, a sealing effect is achieved, a closed space is formed inside the explosion pit 1, the electromagnet 14 is further arranged at the bottom of the step surface, the cover plate 6 made of steel can be adsorbed on the electromagnet 14, the cover plate is pushed open by impact force generated by explosion, the embodiment is a large closed explosion pit environment, and is used for researching nuclear explosion load lower structure response when underground protection engineering (tunnel type protection engineering and the like) is held for a long time, so that the size of the device is large, if the cover plate 6 is too heavy, the cost is increased, the lifting is difficult, if the device is too light, the explosion impact force is easy to push open, and the phenomenon that the cover plate is pushed open cannot occur due to the arrangement of the electromagnet 14 in the embodiment.
In the embodiment, the surface pressure sensor is arranged on the surface of the sand medium layer 3, and the soil pressure box is arranged on the outer surface of the model to be detected 2 and used for detecting the explosion impact pressure.
In the embodiment, at the beginning of the test, explosives 5 are uniformly arranged in the blast pit, and shock waves and detonation gases generated by explosion of the explosives 5 act on the surface of the sand medium layer 3. The high-pressure gas generated after explosion can not be discharged out quickly, the high-pressure gas can be filled in a closed space formed by the side wall of the explosion pit 1 and the cover plate 6, and a uniform explosion pressure load is formed to act on the sand medium 4, at the moment, when the shock wave enters harder material sand from softer material air, due to the increase of the acoustic impedance of the medium, the transmitted wave is stronger than the incident wave, the pressure peak value reaching the surface of the model 2 to be tested can be larger than the incident pressure of the sand surface, and the impact of nuclear explosion can be well simulated.
In the embodiment, the test device for simulating the nuclear explosion load acting on the shallow buried structure in the long-term holding process greatly prolongs the positive pressure duration time of the shock wave in the test section, the positive pressure action time of the shock wave reaching the surface of the sand medium layer 3 can reach 400ms, the positive pressure action time of the shock wave reaching the surface of the model to be tested 2 can reach 750ms, and the problem of simulation of the shallow buried structure under the impact of nuclear explosion is well solved.
The technical solutions of the present invention are not limited to the above embodiments, and all technical solutions obtained by using equivalent substitution modes fall within the scope of the present invention.
Claims (10)
1. The utility model provides a nuclear explosion load analogue means when shallow buried structure's length is held which characterized in that: the device comprises a model to be tested, an explosion pit, a cover plate and explosives, wherein the bottom of the model to be tested is fixedly connected with the bottom of the explosion pit, so that the model to be tested forms a channel structure with openings at two ends, baffles are arranged at the openings at two ends of the channel structure, a closed space is formed inside the model to be tested, a sand medium layer is filled at the lower part of the explosion pit, and the top height of the model to be tested is lower than the top height of the sand medium layer; a steel cable is arranged in the blasting pit, is positioned above the sand medium layer and is respectively fixed on two side walls of the blasting pit at two ends; the explosives are uniformly arranged on the steel cable; the cover plate is arranged at the top of the explosion pit, and a closed space is formed inside the explosion pit.
2. The apparatus for simulating a long-term nuclear explosive load of a shallow buried structure according to claim 1, wherein: the bottom of the explosion pit is provided with a concrete cushion, and the bottom of the model to be tested is fixed on the concrete cushion.
3. The apparatus for simulating a long-term nuclear explosive load of a shallow buried structure according to claim 2, wherein: the model bottom that awaits measuring is through right angle connecting plate fixed connection on the concrete cushion, the both sides of right angle connecting plate laminate with a model side and the concrete cushion that awaits measuring respectively, all are equipped with the through-hole on the both sides of right angle connecting plate, and the right angle connecting plate is through wearing to establish crab-bolt and the model and the concrete cushion fixed connection that await measuring in the through-hole.
4. The apparatus for simulating a long-term nuclear explosive load of a shallow buried structure according to claim 3, wherein: step surfaces which are symmetrically arranged are arranged at the top of the blast pit wall, and the edge of the cover plate is supported at the bottom of the step surfaces.
5. The apparatus for simulating a long-term nuclear explosive load of a shallow buried structure according to claim 4, wherein: a rubber pad is arranged on the inner side of the bottom of the step surface and is in contact with the cover plate.
6. The apparatus for simulating a long-term nuclear explosive load of a shallow buried structure according to claim 5, wherein: an electromagnet is arranged at the bottom of the step surface, and the cover plate is a steel plate.
7. The apparatus for simulating a long-term nuclear explosive load of a shallow buried structure according to claim 6, wherein: the top of the cover plate is provided with a lifting hook.
8. The apparatus for simulating a long-term nuclear explosive load of a shallow buried structure according to claim 1, wherein: and a surface pressure sensor is arranged on the surface of the sand medium layer, and a soil pressure box is arranged on the outer surface of the model to be tested.
9. The apparatus for simulating a long-term nuclear explosive load of a shallow buried structure according to claim 1, wherein: the steel cables are arranged in a criss-cross mode and are evenly distributed in a plane parallel to the top surface of the sand medium layer.
10. The apparatus for simulating a long-term nuclear explosive load in a shallow buried structure according to claim 9, wherein: the inner wall of the explosion pit is provided with a fixing ring, and the steel cable is fixed on the fixing ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221008285.XU CN218180243U (en) | 2022-04-28 | 2022-04-28 | Long-term nuclear explosion load simulation device of shallow-buried structure |
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| CN202221008285.XU CN218180243U (en) | 2022-04-28 | 2022-04-28 | Long-term nuclear explosion load simulation device of shallow-buried structure |
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| CN218180243U true CN218180243U (en) | 2022-12-30 |
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| CN202221008285.XU Active CN218180243U (en) | 2022-04-28 | 2022-04-28 | Long-term nuclear explosion load simulation device of shallow-buried structure |
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