NL2034487B1 - Negative pressure measuring device of cavern causing ground collapse disaster and using method thereof - Google Patents

Negative pressure measuring device of cavern causing ground collapse disaster and using method thereof Download PDF

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Publication number
NL2034487B1
NL2034487B1 NL2034487A NL2034487A NL2034487B1 NL 2034487 B1 NL2034487 B1 NL 2034487B1 NL 2034487 A NL2034487 A NL 2034487A NL 2034487 A NL2034487 A NL 2034487A NL 2034487 B1 NL2034487 B1 NL 2034487B1
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Netherlands
Prior art keywords
cavity
negative pressure
pressure
roof
ground
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NL2034487A
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Dutch (nl)
Inventor
Chen Hongkai
Liu Bin
Liang Xuezhan
Wang Shengjuan
Jiao Pengpeng
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Univ Zaozhuang
Wang Shengjuan
Chen Hongkai
Chongqing Junfuqikai Tech Ltd
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Priority to NL2034487A priority Critical patent/NL2034487B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials

Abstract

Disclosed is a negative pressure measuring device of cavern causing ground collapse 5 disaster and a using method thereof, which comprises an experimental box, wherein a supporting layer with adjustable inclination angle is laid and fixed in the middle part of the inner wall of the experimental box, and a soil cover layer on the cavern roof is laid on the upper surface of the supporting layer. The invention can better simulate the actual environment and improve the accuracy of collecting experimental data.

Description

NEGATIVE PRESSURE MEASURING DEVICE OF CAVERN CAUSING GROUND
COLLAPSE DISASTER AND USING METHOD THEREOF
TECHNICAL FIELD
The invention belongs to the technical field of ground collapse simulation devices, and in particular relates to a negative pressure measuring device of cavern causing ground collapse disaster and a using method thereof.
BACKGROUND
When karst caves develop to cover soil, ground collapse will easily occur under natural or man-made factors. In order to better predict the collapse disaster, it is necessary to analyse the stability of the cave cover that has not collapsed, among which the negative pressure of the cave is an important data in the stability analysis of the cave cover.
In the prior art, although there are some cavern negative pressure measuring devices, they generally have the problem of low simulation accuracy, resulting in low accuracy of experimental data. Therefore, this paper provides a negative pressure measuring device of cavern causing ground collapse disaster and a using method thereof, which can better simulate the actual environment and improve the accuracy of collecting experimental data.
SUMMARY
In order to solve the above technical problems, the invention provides a negative pressure measuring device of cavern causing ground collapse disaster and a using method thereof, which can better simulate the actual environment and improve the accuracy of collecting experimental data.
In order to achieve the above purpose, the present invention provides a negative pressure measuring device of cavern causing ground collapse disaster, including, an experimental box, wherein a supporting layer with adjustable inclination angle is laid and fixed in the middle of the inner wall of the experimental box, and a soil cover layer on the top of the supporting layer is laid, and the bottom end and the side wall of the experimental box are respectively communicated with a drainage pipe and a water inlet pipe; the rain piece is fixed at the top end of the experimental box and corresponds to the soil cover layer on the cavern roof; the external pressure simulation component comprises a sleeve box, wherein that sleeve box is covered outside the rain piece and used for blocking the top opening of the experimental box, and a pressure supply piece for supply pressure to the experimental box is communicated with the sleeve box;
the air pressure monitoring piece has two monitoring ends, which respectively extend into the sleeve box and between the supporting layer and the inner wall of the bottom end of the experimental box.
Further, the supporting layer is a steel mesh, and two opposite inner walls of the experimental box are respectively provided with accommodating grooves, and the inner walls of the accommodating grooves are fixedly connected with mounting plates, which are sequentially provided with a plurality of threaded holes from top to bottom. One side of the mounting plates close to the steel mesh is provided with a clamping piece, which is fixed with one end of the steel mesh and detachably connected with the mounting plates through the threaded holes.
Further, the clamping piece comprises two clamping plates which are arranged oppositely, one side of the steel mesh is located between the two clamping plates, and the two clamping plates are fixedly connected by connecting bolts, and the side walls of the clamping plates located above are threadedly connected with adjusting bolts, which are detachably connected with the threaded holes.
Further, the rain piece includes a rain plate connected to the top end of the experimental box, which is communicated with a water supply tank through a water inlet pipe, and the water inlet pipe passes through the sleeve box.
Further, the pressure supply piece comprises an air supply box, the air supply box is communicated with the inside of the sleeve box through an air supply pipe, and the air outlet end of the air supply pipe is position above the soil cover layer on the cavern roof.
Further, the outer walls of the two opposite side walls of the experimental box are fixedly connected with the bearing plates, and the bottom end of the sleeve box is in contact with the top end of the bearing plates.
Further, the monitoring piece comprises two vacuum pressure gauges, one of which extends into the casing and is located above the soil cover layer on the cavern roof, and the other vacuum pressure gauge is located below the soil cover layer on the cavern roof.
The using method of the negative pressure measuring device of cavern causing ground collapse disaster comprises the following steps:
S1, adjusting the supporting layer: changing the inclination angle of the supporting layer to simulate the inclination angle of the soil cover layer on the cavern roof in a real environment;
S2, filling soil: filling the soil cover layer on the cavern roof on the supporting layer;
S3, simulating underground water: passing water between the supporting layer and the inner wall at the bottom of the experimental box;
S4, simulating external air pressure: opening the pressure supply piece, changing the air pressure in the sleeve box and monitoring through a monitoring end;
S5. starting the experiment: opening the rain piece and the drainage pipe, and recording and collecting the air pressure between the supporting layer and the bottom of the experiment box.
Compared with the prior art, the invention has the following advantages and technical effects: 1. The supporting layer with adjustable inclination angle is used to place the soil cover layer on the cavern roof, which can exactly simulate the actual situation of the soil under the ring. 2. By setting the pressure supply piece, the real air pressure in the actual environment area is simulated, and the accuracy of detection can be improved by matching with the rain piece.
BRIEF DESCRIPTION OF THE FIGURES
The accompanying drawings, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application, and do not constitute an improper limitation of this application. In the attached drawings:
Fig. 1 is a perspective view of a measuring device;
Fig. 2 is a perspective view of the positional relationship between the rain piece and the sleeve box; is a perspective view of the experimental box;
Fig. 3 is a perspective view of the connection relationship between the steel mesh and the experimental box;
Fig. 4 is a sectional view of the connection relationship between the steel mesh and the experimental box;
Among them, 1-experimental box, 2-soil cover layer of cavern roof, 3-drainage pipe, 4- water inlet pipe, 5-sleeve box, 6-steel mesh, 7-accommodating groove, 8-mounting plate, 9- threaded hole, 10-clamping plate, 11-connecting bolt, 12-adjusting bolt, 13-rain plate, 14 -water supply tank, 15 -water inlet pipe, 16 -air supply box, 17 -air supply pipe, 18 -bearing plate, 19 - vacuum pressure gauge.
DESCRIPTION OF THE INVENTION
In the following, the technical scheme in the embodiment of the invention will be clearly and completely described with reference to the attached drawings. Obviously, the described embodiment is only a part of the embodiment of the invention, but not the whole embodiment.
Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative labour belong to the scope of protection of the present invention.
In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be further described in detail with the attached drawings and specific embodiments.
Referring to figures 1 - 5, the invention provides a negative pressure measuring device of cavern causing ground collapse disaster, which comprises an experimental box 1, wherein a supporting layer with adjustable inclination angle is laid and fixed in the middle of the inner wall of the experimental box 1, and a soil cover layer 2 on the top of the supporting layer is laid, and the bottom end and the side wall of the experimental box 1 are respectively communicated with a drainage pipe 3 and a water inlet pipe 15; the rain piece is fixed at the top end of the experimental box 1 and corresponds to the soil cover layer 2 on the cavern roof; the external pressure simulation component comprises a sleeve box 5, wherein that sleeve box 5 is covered outside the rain piece and used for blocking the top opening of the experimental box 1, and a pressure supply piece for supply pressure to the experimental box 1 is communicated with the sleeve box 5; the air pressure monitoring piece has two monitoring ends, which respectively extend into the sleeve box 5 and between the supporting layer and the inner wall of the bottom end of the experimental box 1.
Understandably, the experimental box 1 is used to hold the soil cover layer 2 on the cavern roof, the supporting layer with adjustable inclination angle is used to change the inclination angle of the soil cover layer 2 on the cavern roof, the rain piece is used to simulate rainfall, and the pressure supply piece is matched with the sleeve box 5, so that the soil cover layer 2 on the cavern roof is under controllable external pressure by inflating the sleeve box 5.
For further optimization scheme, refer to Figs. 4 and 5, the supporting layer is a steel mesh 6, and two opposite inner walls of the experimental box 1 are respectively provided with accommodating grooves 7, and the inner walls of the accommodating grooves 7 are fixedly connected with mounting plates 8, which are sequentially provided with a plurality of threaded holes 9 from top to bottom. One side of the mounting plates 8 close to the steel mesh 6 is provided with a clamping piece, which is fixed with one end of the steel mesh 6 and detachably connected with the mounting plates 8 through the threaded holes 9.
In a further optimization scheme, the clamping piece comprises two clamping plates 10 which are arranged oppositely, one side of the steel mesh 6 is located between the two clamping plates 10, and the two clamping plates 10 are fixedly connected by connecting bolts 11, and the side walls of the clamping plates 10 located above are threadedly connected with adjusting bolts 12, which are detachably connected with the threaded holes 9.
It can be understood that the steel mesh 6 is fixedly clamped by the two clamping plates 10, and at the same time, the adjusting bolt 12 is matched with the mounting plate 8, so that the inclination angle of the steel mesh 6 can be changed.
Further, geotextile (not shown in the figure) is laid on the upper surface of the steel mesh 6 to prevent soil from falling from the gap of the steel mesh 6.
For further optimization, referring to Fig. 2 and Fig. 3, the rain piece includes a rain plate 13 connected to the top end of the experimental box 1, which is communicated with a water supply tank 14 through a water inlet pipe 15, and the water inlet pipe 15 passes through the sleeve box 5. Rain plate 13 is used to simulate rainfall.
In a further optimization scheme, that pressure supply piece comprises an air supply box 16, the air supply box 16 is communicated with the inside of the sleeve box 5 through an air supply pipe 17, and the air outlet end of the air supply pipe 17 is position above the soil cover layer 2 on the cavern roof. The air supply box 18 is used to inflate the sleeve box 5, and the 5 pressure in the sleeve box 5 can be monitored in real time by a vacuum pressure gauge 19.
Further, the water inlet pipe 15 and the air supply pipe 17 can be multi-section detachable water pipes, thus facilitating the installation or disassembly of the sleeve box 5.
For further optimization, refer to Fig. 3, the outer walls of the two opposite side walls of the experimental box 1 are fixedly connected with the bearing plates 18, and the bottom end of the sleeve box 5 is in contact with the top end of the bearing plates 18. The bearing plate 18 is used to support the sleeve box 5, and at the same time, the bottom inner wall of the sleeve box 5 should be attached to the outer wall of the experimental box 1 to improve the sealing effect of the sleeve box 5.
For further optimization, referring to Fig. 1, the monitoring piece includes two vacuum pressure gauges 19, one of which extends into the casing 5 and is located above the soil cover layer 2 on the cavern roof, and the other vacuum pressure gauge 19 is located below the soil cover layer 2 on the cavern roof. Two vacuum pressure gauges 19 are used for pressure measurement in different areas, wherein the output signal ends of the vacuum pressure gauges 19 can be connected with an automatic receiving device for recording and collecting data.
The user of the negative pressure measuring device of cavern causing ground collapse disaster further optimizes the scheme, and the using steps include:
S1, adjusting that steel mesh 6: changing the inclination angle of the steel mesh 6 to simulate the inclination angle of the soil cover layer 2 on the cavern roof in a real environment;
S2, filling soil: after laying geotextile on the steel mesh 8, filling the soil cover layer 2 on the cavern roof;
S3, simulating underground water: passing water between the steel mesh 6 and the inner wall at the bottom of the experimental box 1 through the water inlet pipe 15;
S4, simulating external air pressure: opening the air supply box 18, changing the air pressure in the sleeve box 5 and monitoring by a vacuum pressure gauge;
S5. starting the experiment: opening the water supply tank 14 and the drainage pipe 3, and record and collect the air pressure between the steel mesh 6 and the bottom of the experiment tank 1.
The above is only the preferred embodiment of this application, but the protection scope of this application is not limited to this. Any change or replacement that can be easily thought of by a person familiar with this technical field within the technical scope disclosed in this application should be included in the protection scope of this application. Therefore, the protection scope of this application should be based on the protection scope of the claims.

Claims (8)

CONCLUSIESCONCLUSIONS 1. Een inrichting voor het meten van de negatieve druk in een holte die een ramp instorting van door instorting van de grond kan veroorzaken, welke inrichting omvat: — een onderzoeksbak (1}, waarbij — een steunlaag met instelbare hellingshoek in het midden van de binnenwand van de onderzoeksbak (1) is geplaatst en bevestigd, — een bodembedekkingslaag (2) op het dak van de holte bovenop de steunlaag is gelegd, en — het onder gelegen uiteinde en de zijwand van de onderzoeksbak (1) zijn verbonden met respectievelijk een drainagebuis (3) en een watertoevoerbuis (15); — een beregeningsonderdeel dat aan het boven gelegen uiteinde van de onderzoeksbak (1) is bevestigd en overeenkomt met de bodembedekkingslaag (2) op het dak van de holte; — een externe druksimulatiecomponent die een schuifbak (5) omvat, waarbij — de schuifbak (5) buiten het beregeningsonderdeel is afgedekt en wordt gebruikt om de boven gelegen opening van de onderzoeksbak (1) te blokkeren, en — een drukvoorzieningsonderdeel voor het aanbrengen van druk op de onderzoeksbak (1) in verbinding staat met de schuifbak (5); — een luchtdrukbewakingsonderdeel dat twee bewakingsuiteinden heeft, die zich respectievelijk in de schuifbak (5) en tussen de steunlaag en de binnenwand van het onder gelegen uiteinde van de onderzoeksbak (1) uitstrekken.1. A device for measuring negative pressure in a cavity liable to cause a disaster by ground collapse, comprising: inner wall of the examination tank (1) is placed and secured, — a ground cover layer (2) is laid on the roof of the cavity on top of the supporting layer, and — the lower end and side wall of the examination tank (1) are connected respectively to a drainage pipe (3) and a water supply pipe (15); — an irrigation component attached to the upper end of the examination tank (1) and corresponding to the soil cover layer (2) on the roof of the cavity; (5), in which — the sliding tray (5) is covered outside the irrigation part and is used to block the upper opening of the examination tank (1), and — a pressure supply part for applying pressure to the examination tank (1) in is connected to the sliding box (5); — an air pressure monitoring component having two monitoring ends extending respectively into the sliding tray (5) and between the support layer and the inner wall of the lower end of the examination tray (1). 2. De inrichting voor het meten van de negatieve druk in een holte die een ramp instorting van door instorting van de grond kan veroorzaken volgens conclusie 1, waarbij — de steunlaag een stalen gaas is (6), — twee tegenover elkaar liggende binnenwanden van de onderzoeksbak (1) voorzien zijn van opvanggroeven (7), — de binnenwanden van de opvanggroeven (7) vast zijn verbonden met bevestigingsplaten (8), die achtereenvolgens van boven naar beneden voorzien zijn van een aantal schroefgaten (9), — een zijde van de bevestigingsplaten (8) nabij het stalen gaas (6) is voorzien van een klemstuk dat met een uiteinde van het stalen gaas (6) is bevestigd en via de schroefgaten (9) losneembaar met de bevestigingsplaten (8) is verbonden.2. The device for measuring the negative pressure in a cavity capable of causing a disaster by ground collapse according to claim 1, wherein - the supporting layer is a steel mesh (6), - two opposite inner walls of the examination container (1) is provided with collection grooves (7), - the inner walls of the collection grooves (7) are firmly connected to mounting plates (8), which are successively provided with a number of screw holes (9) from top to bottom, - one side of the mounting plates (8) near the steel mesh (6) are provided with a clamping piece that is attached to one end of the steel mesh (6) and is releasably connected to the mounting plates (8) via the screw holes (9). 3. De inrichting voor het meten van de negatieve druk in een holte die een ramp instorting van door instorting van de grond kan veroorzaken volgens conclusie 2, waarbij — het klemstuk klemplaten (10) omvat die tegenover elkaar zijn geplaatst,The device for measuring the negative pressure in a cavity capable of causing a ground collapse disaster according to claim 2, wherein - the clamping piece comprises clamping plates (10) positioned opposite each other, — een zijde van het stalen gaas (6) zich tussen de twee klemplaten (10) bevindt, — de twee klemplaten (10) met verbindingsbouten (11) vast zijn verbonden, en — de zijwanden van de bovenliggende klemplaten (10) met stelbouten (12) schroefbaar zijn verbonden, welke stelbouten met de draadgaten (9) afneembaar zijn verbonden.— one side of the steel mesh (6) is between the two clamping plates (10), — the two clamping plates (10) are firmly connected with connecting bolts (11), and — the side walls of the upper clamping plates (10) are fixed with adjusting bolts ( 12) are screwably connected, which adjusting bolts are removably connected to the threaded holes (9). 4. De inrichting voor het meten van de negatieve druk in een holte die een ramp instorting van door instorting van de grond kan veroorzaken volgens conclusie 1, waarbij het beregeningsonderdeel een regenplaat (13) omvat die met het boveneinde van de onderzoeksbak (1) is verbonden, die via een waterinlaatpijp (15) is verbonden met een watertoevoertank (14), welke waterinlaatpijp (15) door de schuifbak (5) gaat.The device for measuring the negative pressure in a cavity that may cause a disaster by ground collapse according to claim 1, wherein the irrigation part comprises a rain plate (13) connected to the upper end of the examination tank (1). connected via a water inlet pipe (15) to a water supply tank (14), which water inlet pipe (15) passes through the sliding box (5). 5. De inrichting voor het meten van de negatieve druk in een holte die een ramp instorting van door instorting van de grond kan veroorzaken volgens conclusie 1, waarbij het drukvoorzieningsonderdeel een luchttoevoerbak (16) omvat, waarbij — de luchttoevoerbak (16) via een luchttoevoerleiding (17) in verbinding staat met de binnenkant van de schuifbak (5), — het uiteinde van de luchttoevoerleiding (17) zich boven de bodembedekkingslaag (2) op het dak van de grot bevindt.The device for measuring the negative pressure in a cavity that may cause a ground collapse disaster according to claim 1, wherein the pressure supply part comprises an air supply box (16), wherein - the air supply box (16) via an air supply line (17) is connected to the inside of the sliding box (5), — the end of the air supply pipe (17) is above the ground cover layer (2) on the roof of the cave. 6. De inrichting voor het meten van de negatieve druk in een holte die een ramp instorting van door instorting van de grond kan veroorzaken volgens conclusie 1, waarbij — de buitenwanden van de twee tegenover elkaar liggende zijwanden van de onderzoeksbak (1) vast zijn verbonden met de draagplaten (18), en — het onder gelegen uiteinde van de schuifbak (5) in contact staat met het boven gelegen uiteinde van de draagplaten (18).The device for measuring the negative pressure in a cavity capable of causing a disaster by ground collapse according to claim 1, wherein - the outer walls of the two opposite side walls of the examination tank (1) are rigidly connected with the supporting plates (18), and - the lower end of the sliding box (5) is in contact with the upper end of the supporting plates (18). 7. De inrichting voor het meten van de negatieve druk in een holte die een ramp instorting van door instorting van de grond kan veroorzaken volgens conclusie 1, waarbij — het bewakingsonderdeel twee vacuümdrukmeters (19) omvat, waarbij er een ervan zich in de mantelbuis (5) uitstrekt en zich boven de grondbedekkingslaag {2} op het dak van de holte bevindt, en — de andere vacuümdrukmeter (19) zich onder de bodembedekkingslaag (2) op het dak van de holte bevindt.The device for measuring the negative pressure in a cavity capable of causing a ground collapse disaster according to claim 1, wherein - the monitoring part comprises two vacuum pressure gauges (19), one of them being located in the casing ( 5) extends and is located above the ground cover layer {2} on the roof of the cavity, and — the other vacuum pressure gauge (19) is located below the ground cover layer (2) on the roof of the cavity. 8. Een werkwijze voor het toepassen van de inrichting voor het meten van de negatieve druk in een holte die een ramp instorting van door instorting van de grond kan veroorzaken volgens conclusie 1, omvattende de stappen:A method of applying the negative pressure measuring device in a cavity that may cause a ground collapse disaster according to claim 1, comprising the steps: S1: instellen van de steunlaag: wijzigen van de hellingshoek van de steunlaag om de hellingshoek van de grondbedekkingslaag (2) op het dak van de holte in een reële omgeving te simuleren;S1: Support layer adjustment: Changing the slope angle of the support layer to simulate the slope angle of the ground cover layer (2) on the roof of the cavity in a real environment; S2: vullen van de grond: vullen van de grondbedekkingslaag (2) op het dak van de holte op de steunlaag;S2: ground filling: filling the ground cover layer (2) on the roof of the cavity on the supporting layer; S3: simuleren van ondergronds water: doorlaten van water tussen de steunlaag en de binnenwand op de bodem van de onderzoeksbak (1);S3: simulating underground water: allowing water to pass between the support layer and the inner wall at the bottom of the research tank (1); S4: simuleren van externe luchtdruk: openen van het drukonderdeel, wijzigen van de luchtdruk in de schuifbak (5) en bewaken via een bewakingsuiteinde;S4: Simulate external air pressure: open the pressure part, change the air pressure in the sliding box (5) and monitor it via a monitoring end; S5: starten van het experiment: openen van het beregeningsonderdeel en de afvoerbuis (3),S5: starting the experiment: opening the irrigation part and the drainage pipe (3), en registreren en verzamelen van de luchtdruk tussen de steunlaag en de bodem van de onderzoeksbak (1).and recording and collecting the air pressure between the support layer and the bottom of the examination tank (1).
NL2034487A 2023-04-03 2023-04-03 Negative pressure measuring device of cavern causing ground collapse disaster and using method thereof NL2034487B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110133221A (en) * 2019-05-15 2019-08-16 枣庄学院 For simulating the experimental rig of cavern's negative pressure
CN112611850A (en) * 2020-12-16 2021-04-06 同济大学 Surface karst fissure area soil surface loss and underground leakage simulation device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110133221A (en) * 2019-05-15 2019-08-16 枣庄学院 For simulating the experimental rig of cavern's negative pressure
CN112611850A (en) * 2020-12-16 2021-04-06 同济大学 Surface karst fissure area soil surface loss and underground leakage simulation device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEN XUEJUN ET AL: "Analysis of the Influence of Groundwater Level Fluctuation on Karst Soil Cave Collapse", GEOFLUIDS, vol. 2023, 21 January 2023 (2023-01-21), GB, pages 1 - 17, XP093103930, ISSN: 1468-8115, Retrieved from the Internet <URL:https://downloads.hindawi.com/journals/geofluids/2023/7540561.pdf> [retrieved on 20231121], DOI: 10.1155/2023/7540561 *

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