CN210597184U - Indoor model device for detecting formation-cover re-grouting lifting deformation - Google Patents
Indoor model device for detecting formation-cover re-grouting lifting deformation Download PDFInfo
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- CN210597184U CN210597184U CN201921327555.1U CN201921327555U CN210597184U CN 210597184 U CN210597184 U CN 210597184U CN 201921327555 U CN201921327555 U CN 201921327555U CN 210597184 U CN210597184 U CN 210597184U
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Abstract
The utility model discloses an indoor model device for stratum-cover re-grouting lifting deformation detection, which comprises a model box, a test piece, a pressure control system and a detection system, wherein the test piece is arranged in the model box, the test piece is provided with at least one grouting hole, the pressure control system comprises a conveying pipe, a pump and an adjusting valve, one end of the conveying pipe extends into the grouting hole, the other end of the conveying pipe is connected with the pump, and the adjusting valve is arranged on the conveying pipe and is positioned between the pump and a grouting hole orifice; the detection system is provided with a pressure sensor and a strain gauge, the pressure sensor is used for detecting grouting pressure, and the strain gauge is used for detecting lifting displacement. The utility model provides an indoor model device that is used for stratum-lid to irritate thick liquid again and lifts dynamic deformation to detect can simulate the lifting deformation condition under different stratum, the different grouting parameter condition.
Description
Technical Field
The utility model relates to a grout stratum lifts and moves research technical field, concretely relates to indoor model device that is used for stratum-lid to heavily irritate thick liquid and lifts deformation detection.
Background
The grouting is to apply pressure to the slurry or chemical solution with gelling property according to a specified proportion or concentration by a machine, and press the slurry into rock cracks or foundation pores, surrounding rock cracks or tunnels to be grouted by pressure through drilling. Thus filling the joints, cracks, pores, gaps, cavities or cracks, and playing the roles of consolidation, adhesion, seepage prevention, bearing strength and deformation resistance improvement, stress transmission and the like.
The concrete covered rock-fill dam is a common dam type in water conservancy and hydropower engineering, the consolidation grouting and curtain grouting of the dam type are generally carried out in bedrock covered by a concrete cover plate, the grouting pressure, the grout injection rate and the stratum crack condition are all reasons for causing the lifting deformation of the concrete cover, and the integrity and the seepage-proofing capability of the cover are seriously influenced due to the concrete cover heavy crack caused by the lifting deformation.
The dam foundation consolidation grouting is aimed at shallower applied stratum, the hole depth is usually only five to ten meters, and in order to achieve the purpose of stratum fracture consolidation, high-pressure grouting is usually used for completion, so that stratum cracking and lifting accidents are easily caused. However, dam foundation consolidation grouting is an important link for reinforcing and seepage-proofing a dam, grouting engineering is concealed engineering, and improper control of the grouting process easily causes accidents such as stratum lifting, dislocation and the like, so that secondary damage to the grouted stratum is caused, and the safety performance of the dam is seriously influenced. The grouting field test has certain limitation on the research of lifting response and control because of the influence of factors such as stratum singleness, long construction period, large arrangement field of grouting holes and lifting holes, and the need of independent arrangement of the lifting holes, so that the simulation test device for the lifting deformation of the stratum is designed according to the requirements of field grouting construction to simulate the lifting deformation condition under the conditions of different stratums and different grouting parameters, and has important significance on the research of the lifting risk control.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in: to the technical problem that prior art exists, the utility model provides an indoor model device that is used for stratum-lid heavy grouting to lift deformation to detect can simulate the deformation condition of lifting under different stratum, the different grouting parameter condition.
In order to solve the technical problem, the utility model provides a technical scheme does:
an indoor model device for detecting stratum-cover re-grouting lifting deformation comprises a model box, a test piece, a pressure control system and a detection system, wherein the test piece is arranged in the model box and is provided with at least one grouting hole, the pressure control system comprises a conveying pipe, a pump and an adjusting valve, one end of the conveying pipe extends into the grouting hole, the other end of the conveying pipe is connected with the pump, and the adjusting valve is arranged on the conveying pipe and is positioned between the pump and a grouting hole orifice; the detection system is provided with a pressure sensor and a strain gauge, the pressure sensor is used for detecting grouting pressure, and the strain gauge is used for detecting lifting displacement.
The further improvement of the technical scheme is as follows:
the test piece comprises a cover plate and at least one stratum from top to bottom in sequence, and the grouting hole penetrates through the cover plate and extends into the stratum.
In the above scheme, preferably, the detection system is further provided with a stress-strain sensor, the pressure sensor is located at the bottom of the grouting hole, and each layer of stratum is provided with the stress-strain sensor.
In the above scheme, preferably, the pressure sensors are more than two, and the delivery pipe is provided with one pressure sensor near the grouting hole.
In the above scheme, preferably, the strain gauges are provided with a plurality of groups, and are arranged on the surface of the cover plate and the outer wall of the mold box.
In the above aspect, preferably, the strain gauges are disposed at intervals.
In the above scheme, preferably, the ground layer is uniformly provided with the strain gauges along the lifting deformation direction and the direction perpendicular to the lifting deformation direction.
In the above scheme, preferably, the indoor model device is further provided with an automatic grouting recorder, and the detection system is electrically connected with the automatic grouting recorder.
In the above scheme, preferably, a flowmeter is arranged on the conveying pipe.
The utility model provides an indoor model device that is used for stratum-lid heavy grouting to lift dynamic deformation to detect compares with prior art and has following advantage: the utility model discloses according to the actual grouting site conditions, confirm indoor model test scale proportion, experimental material selection and test scheme, through the utility model discloses an indoor model device can realize the simulation of actual engineering lift deformation process, device easy operation can simulate the stratum lift simulation under engineering construction realization different grouting pressure and stratum parameter situation. The utility model discloses can conveniently lift the research of phenomenon to the grouting stratum to the influence of stratum-lid heavy destruction and lift the risk control effectively, to formulating grouting safety construction technical standard and to having important reference value to the prevention of lifting the risk phenomenon.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is the utility model discloses the arrangement diagram of apron grout hole and foil gage when using the implementation.
The reference numbers in the figures illustrate:
1. a pressure control system; 11. a pump; 12. a flow meter; 13. adjusting a valve; 14. a delivery pipe; 2. grouting automatic recorder; 3. a detection system; 31. a pressure sensor; 32. a stress-strain sensor; 33. a strain gauge; 4. a test piece; 41. a cover plate; 42. an earth formation; 43. grouting holes; 5. and (5) a model box.
Detailed Description
The following describes the embodiments of the present invention in detail. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
Fig. 1 and fig. 2 show an embodiment of the indoor model device for formation-cover re-grouting lifting deformation detection of the present invention, the indoor model device includes a model box 5, a test piece 4, a pressure control system 1 and a detection system 3, the test piece 4 is disposed in the model box 5, the test piece 4 is provided with at least one grouting hole 43, the pressure control system 1 includes a conveying pipe 14, a pump 11 and a regulating valve 13, one end of the conveying pipe 14 extends into the grouting hole 43, the other end is connected with the pump 11, the regulating valve 13 is disposed on the conveying pipe 13, and is located between the orifice of the pump 11 and the grouting hole 43; the detection system 3 is provided with a pressure sensor 31 and a strain gauge 33, wherein the pressure sensor 31 is used for detecting grouting pressure, and the strain gauge 33 is used for detecting lifting displacement.
In this embodiment, the test piece 4 sequentially includes a cover plate 41 and two strata 42 from top to bottom, and the grouting hole 43 penetrates through the cover plate 41 and extends into the lowest stratum 42. The shape of the model box 5 is cuboid, the size of the inner space is 2000mm multiplied by 1500mm multiplied by 1200 mm (length multiplied by width multiplied by height), and the model box is formed by splicing 5 aluminum alloy plates with the thickness of 15 mm. In the stratum base material, by analyzing the physical and mechanical properties of on-site strata (such as granite, basalt and sedimentary rock), a concrete test piece with similar mechanical properties to the on-site strata rock is determined as an indoor stratum material by adopting a rock physical and mechanical test means; the simulation of the cracks adopts concrete to manually set the cracks, for example, a sheet stripping method in the prior art is adopted to make closed cracks and open cracks with different trends and different distributions. The fracture density and the fracture opening of the test piece 4 can be set according to a certain rule and can also be determined according to the field stratum permeability, so that the indoor model scale test can be ensured to truly simulate the field construction conditions.
In this embodiment, the detection system 3 is further provided with a stress-strain sensor 32, the pressure sensor 31 is located at the bottom of the grouting hole 43, and each stratum 42 is provided with the stress-strain sensor 32.
In this embodiment, more than two pressure sensors 31 are provided, and one pressure sensor 41 is provided at the position of the delivery pipe 14 near the grouting hole 43.
In this embodiment, a plurality of sets of strain gauges 33 are provided and arranged on the surface of the cover plate 41 and the outer wall of the mold box 5. The strain gauges 33 are arranged at intervals. In this embodiment, as shown in fig. 2, which is a layout diagram of grouting holes 43 and strain gauges 33, 15 strain gauges 33 are adhered to the surface of a cover plate 41 and arranged in three rows, with 200mm of transverse intervals and 300mm of longitudinal intervals; 8 strain gages 33 are adhered to the surface of the interface of the two stratums 2, and the adjacent strain gages 33 are transversely spaced by 250mm and longitudinally spaced by 400 mm; 8 strain gages 33 are adhered to the outer side of the model box and distributed in two rows; the adjacent strain gauges 33 are transversely spaced by 250mm and longitudinally spaced by 400 mm; the strain gauges 33 are uniformly arranged on the ground layer 42 along the lifting deformation direction and perpendicular to the lifting deformation direction, and the displacement of the cover plate 41 is measured by the strain gauges 33; pressure sensors 31 are embedded at the bottom of the grout hole 43 and in different ground layers 42 for observing the variation of the grout pressure at different hole depths.
In this embodiment, the indoor model device is further provided with an automatic grouting recorder 2, and the detection system 3 is electrically connected with the automatic grouting recorder 2.
In this embodiment, a flow meter is provided on the delivery pipe. The utility model discloses a model still is equipped with the controller that is used for controlling equipment such as governing valve 13, pump 11, and the controller can choose for use the general controller that can realize equipment such as governing valve 13, pump 11 switching for use in prior art, does not do other description here. The controller controls grouting parameters such as grouting pressure, water-cement ratio, flow and the like, the stress-strain sensor measures the lifting displacement result of the concrete precast slab in the stratum 42, the result is displayed on the grouting automatic recorder 2 through an RS232 interface and is compared with pressure, density and water-cement ratio data, and real-time printing of a lifting curve is realized; stress-strain sensors 32 are uniformly arranged on the stratum 42 along the deformation direction of the rock body and perpendicular to the deformation direction and are used for measuring the strain of the stratum 42; the strain gauges 33 are uniformly arranged on the cover plate 41 and used for measuring the strain displacement of the cover plate 41; the grouting pressure, the lifting displacement, the slurry flow and the stratum-cover stress strain are sampled and recorded by the grouting automatic recorder 2. The grouting pressure change process can be analyzed through lifting deformation, and the lifting risk caused by improper grouting pressure control is controlled and guided.
In the test, the pressure control system 1 is first used to inject slurry into the second formation 42 at the bottom, so that the lift occurs. During which individual meter readings are observed and recorded. The rate of injection and the volume of slurry injected into the formation 42 can be controlled by adjusting the valve 13 to control the occurrence of lift phenomena to varying degrees. And the stratum lifting value and the dependent variable of the cover plate 41 under different grouting working conditions can be observed in a comparison mode by combining the mixing ratio of the slurry, so that a more effective grouting stratum lifting treatment method can be obtained.
The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. An indoor model device for detecting formation-cover re-grouting lifting deformation is characterized by comprising a model box, a test piece, a pressure control system and a detection system, wherein the test piece is arranged in the model box and is provided with at least one grouting hole, the pressure control system comprises a conveying pipe, a pump and an adjusting valve, one end of the conveying pipe extends into the grouting hole, the other end of the conveying pipe is connected with the pump, and the adjusting valve is arranged on the conveying pipe and is positioned between the pump and the orifice of the grouting hole; the detection system is provided with a pressure sensor and a strain gauge, the pressure sensor is used for detecting grouting pressure, and the strain gauge is used for detecting lifting displacement.
2. The indoor model device for detecting the lifting deformation of the stratum-cover re-grouting according to claim 1, wherein the test piece comprises a cover plate and at least one stratum in sequence from top to bottom, and the grouting hole penetrates through the cover plate and extends into the stratum.
3. The indoor model device for formation-cover re-grouting lifting deformation detection as claimed in claim 2, wherein the detection system is further provided with a stress-strain sensor, the pressure sensor is positioned at the bottom of the grouting hole, and each formation is provided with the stress-strain sensor.
4. The indoor model device for formation-cover re-grouting lifting deformation detection as claimed in claim 3, wherein the number of the pressure sensors is more than two, and the delivery pipe is provided with one pressure sensor near the grouting hole.
5. The indoor model device for formation-cover re-grouting lifting deformation detection as claimed in claim 3, wherein the strain gauges are provided with multiple groups and are arranged on the surface of the cover plate and the outer wall of the model box.
6. The indoor model device for formation-cover re-grouting lifting deformation detection as claimed in claim 5, wherein the strain gauges are arranged at intervals.
7. The indoor model device for formation-cover re-grouting lifting deformation detection as claimed in claim 5, wherein strain gauges are uniformly arranged on the formation along the lifting deformation direction and perpendicular to the lifting deformation direction.
8. The indoor model device for detecting the lifting deformation of the stratum-cover re-grouting according to claim 1, wherein the indoor model device is further provided with an automatic grouting recorder, and the detection system is electrically connected with the automatic grouting recorder.
9. The indoor model device for formation-cover re-grouting lifting deformation detection as claimed in claim 1, wherein a flow meter is arranged on the conveying pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921327555.1U CN210597184U (en) | 2019-08-16 | 2019-08-16 | Indoor model device for detecting formation-cover re-grouting lifting deformation |
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| CN201921327555.1U CN210597184U (en) | 2019-08-16 | 2019-08-16 | Indoor model device for detecting formation-cover re-grouting lifting deformation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650365A (en) * | 2020-07-14 | 2020-09-11 | 清华大学 | Intelligent grouting multifunctional test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650365A (en) * | 2020-07-14 | 2020-09-11 | 清华大学 | Intelligent grouting multifunctional test device |
| CN111650365B (en) * | 2020-07-14 | 2021-05-07 | 清华大学 | Intelligent grouting multifunctional test device |
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