An experimental device for simulating super-long borehole grouting and monitoring changes in slurry along the way

Abstract

The utility model discloses a kind of experimental devices of simulating super-long borehole grouting and monitoring slurry along-path variation, it is related to geotechnical engineering grouting simulation and monitoring technical field, the device includes simulation borehole pipeline and along-path monitoring component;The simulation borehole pipeline includes several transparent pipe sections, several transparent pipe sections are sequentially folded arrangement in annular mode on plane and are assembled by standardization quick coupling between two, form grouting transport path equivalent to super-long borehole;Several monitoring points are arranged on the simulation borehole pipeline in the length direction of grouting transport path, a group of along-path monitoring components are equipped on each monitoring point, the along-path monitoring component includes pressure sensor and flow sensor, for monitoring the pressure and flow parameter variation characteristic in slurry transport process.The utility model can simulate the pipeline of super-long borehole, and effectively monitor the pressure, flow and physical property variation in the transport process of slurry in borehole.

Description

Technical Field

[0001] This utility model relates to the field of grouting simulation and monitoring technology in geotechnical engineering, specifically to an experimental device for simulating grouting in ultra-long boreholes and monitoring changes in grout along the borehole. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] Grouting technology, as an important means in geotechnical engineering to control groundwater seepage, reinforce soil structure, and improve foundation conditions, is widely used in major projects such as tunnel construction, slope treatment, reservoir dams, mining, and subway construction. With the continuous expansion of project scale and the increasing complexity of construction environments, ultra-long borehole grouting technology has gradually developed into an important means to address deep geological conditions, complex seepage channels, and the need for advanced protection. Especially in the fields of tunnel advanced support and advanced water plugging, high-pressure grouting through boreholes tens of meters or even exceeding 100 meters has become one of the mainstream technologies.

[0004] However, in ultra-long-distance borehole grouting, the grout's flow state and physical properties are affected by numerous factors due to the long-distance pipeline system during its high-pressure, high-speed transport. For example, the grout experiences significant pressure loss during transport, and grout particles may agglomerate, settle, or separate due to uneven flow velocity or shear force, leading to changes in grout viscosity, homogeneity, and rheological properties along the route. To ensure stable grouting operations, it is necessary to analyze the changes in the physical properties of the grout during long-distance transport. However, in actual engineering projects, due to geographical limitations, it is difficult to obtain data on the flow regime and property changes of the grout at different locations within the borehole. This makes grouting design, parameter control, and effect evaluation heavily reliant on experience and inversion methods, resulting in significant engineering uncertainties.

[0005] Currently, research on grouting transport behavior mainly focuses on short-distance, low-pressure grouting conditions. It primarily analyzes grout flow patterns and pressure changes through theoretical calculations, empirical formulas, or numerical simulations. While this provides a certain theoretical basis, it cannot fully and accurately reflect the grout flow characteristics during ultra-long borehole grouting. Furthermore, limitations exist in experimental conditions, borehole layout, and monitoring methods. For example, ultra-long borehole grouting in actual engineering projects requires significant space for laboratory simulations, and traditional experimental platforms are constrained by site limitations, making it difficult to simulate long-distance grouting paths and grout attenuation characteristics along the path. There is currently a lack of experimental platforms that can realistically reproduce ultra-long borehole grouting conditions, and a lack of monitoring of grout flow patterns and property changes under ultra-long borehole grouting conditions. Utility Model Content

[0006] To address the technical bottlenecks of existing grouting experimental devices, such as their inability to effectively simulate ultra-long borehole grouting conditions, lack of real-time monitoring methods for grout properties along the drilling path, and difficulty in obtaining the evolution law of grout physical properties during high-pressure long-distance transportation, this utility model provides an experimental device for simulating ultra-long borehole grouting and monitoring grout changes along the drilling path. By designing a pipeline to simulate ultra-long boreholes and the ability to monitor the grout properties inside the pipeline, the device enables the monitoring of pressure, flow rate, and physical property changes of grout during its transportation within the borehole, providing experimental support for optimizing engineering grouting design.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An experimental device for simulating grouting in ultra-long boreholes and monitoring grout changes along the drilling path includes a simulated borehole pipe and a path monitoring component. The simulated borehole pipeline includes several transparent pipe sections, which are arranged in a ring shape on a plane and assembled in pairs through standardized quick connectors to form a grouting and transportation path equivalent to an ultra-long borehole. Several monitoring points are set up along the simulated borehole pipeline along the length of the grouting transportation path. Each monitoring point is equipped with a set of along-path monitoring components, which include pressure sensors and flow sensors, to monitor the pressure and flow parameter changes during the grout transportation process.

[0008] The above design allows for the continuous arrangement of transparent pipe segments to form a linear equivalent channel with real hydraulic characteristics. This can be used to recreate the flow path and frictional attenuation characteristics of grout in actual long boreholes. While meeting the requirements for ultra-long-distance simulation, it can effectively save laboratory space and realize the simulation and experimentation of ultra-long borehole grouting conditions.

[0009] In a further technical solution, several transparent pipe sections are made of transparent PVC round pipes or transparent acrylic round pipes.

[0010] The above design facilitates real-time external observation of the grout's flow state, stratification, flocculation, sedimentation, and other physical changes during transport, providing experimental support for optimizing engineering grouting design.

[0011] In a further technical solution, the transparent pipe sections located at the beginning and end of the simulated drilling pipe are respectively equipped with grouting inlet joints and grout outlet joints; Among them, the end of the first pipe section that is not connected to other pipe sections serves as the grout inlet. The grout inlet is equipped with a grouting inlet connector, which is connected to a grouting pump. The end of the tail section that is not connected to other sections serves as the slurry outlet. The slurry outlet is equipped with an outlet connector, which is connected to the recovery container.

[0012] In a further technical solution, both the grouting inlet connector and the grout outlet connector adopt a standardized quick-change structure.

[0013] Through the above design, the entire device no longer relies on a complex grout supply and recovery system, but focuses solely on simulating the changes in grout properties within the duct, providing excellent experimental platform scalability and versatility. Moreover, the standardized quick-change interface design facilitates external connection to grouting pumps or pressure sources. This structure allows for flexible adjustment of parameters such as grouting pressure, flow rate, and concentration, meeting the control and testing needs under various grouting conditions, and possessing high compatibility and scalability.

[0014] Further technical solutions involve deploying several monitoring points at equal intervals.

[0015] A further technical solution involves setting a predetermined distance between the pressure sensor and the flow sensor at each monitoring point on the pipeline.

[0016] The above design enables monitoring of the pressure, flow rate, and physical properties of the grout at any location during the grouting process of ultra-long boreholes. Equidistant monitoring simplifies the complexity of the analysis.

[0017] A further technical solution involves installing a standardized quick connector at each monitoring point on the pipeline, located above the pipeline wall. A pressure sensor is then connected to this quick connector to record the slurry transport pressure at that monitoring point in real time.

[0018] A further technical solution involves installing an ultrasonic clamp-on flow meter at each monitoring point on the pipeline. The ultrasonic clamp-on flow meter is directly clamped to the outside of the pipeline wall and is used to record the slurry flow velocity inside the pipeline at the monitoring point.

[0019] The standardized design of the monitoring interface allows for quick plugging and unplugging and replacement, facilitating maintenance and expansion of sensor types.

[0020] A further technical solution involves assembling all joints and interfaces using sealing rings.

[0021] By using sealing rings at all interfaces, pipeline integrity can be ensured and system stability can be improved.

[0022] In a further technical solution, the device also includes an external data processing module; the data processing module is electrically connected to the along-process monitoring component and is used to synchronously acquire the grouting transport pressure and grout flow rate at each monitoring point and analyze the real-time spatial distribution of grout properties.

[0023] Through the above design, the slurry transport pressure and slurry flow rate at each monitoring point can be obtained in real time and accurately, and the slurry pressure and flow rate information of each monitoring point along the process can be collected simultaneously to realize the real-time spatial distribution analysis of slurry properties.

[0024] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model provides an experimental device for simulating grouting in ultra-long boreholes and monitoring grout changes along the pipeline. The device is constructed by modularly connecting multiple transparent pipes and using a ring-shaped folding arrangement to create a transport channel equivalent to an ultra-long borehole in actual engineering. This realistically simulates the grouting conditions in ultra-long boreholes and can effectively reproduce the flow path and hydraulic environment of the grout during high-pressure, long-distance transport. Moreover, multiple monitoring points are set along the simulated borehole pipeline. Each monitoring point is equipped with a high-precision pressure sensor and an ultrasonic clamp-type flow meter to achieve multi-channel synchronous acquisition of key parameters such as pressure and flow rate of the grout during transport. This allows for understanding the spatial distribution characteristics of the grout performance and provides experimental support for optimizing engineering grouting design.

[0025] 2. In the experimental device proposed in this utility model, the simulated drilling pipe is made of transparent PVC or acrylic material, and the entire pipe section is visible. During the experiment, the changes in the flow state of the slurry, such as flocculation, sedimentation, stratification, and blockage, can be observed directly, which improves the ability to perceive and judge the changes in the physical properties of the slurry. Moreover, the pipe connection adopts a combination of quick connectors and sealing rings, which has excellent sealing performance, compact structure, and convenient disassembly and assembly. This is conducive to frequent reconstruction of experiments and parameter comparison tests, thereby improving experimental efficiency and adaptability.

[0026] 3. The experimental device proposed in this utility model does not rely on a complex grout supply and recovery system, but focuses solely on simulating the changes in grout performance within the duct. It is easy for research units and laboratories to deploy and use repeatedly, and has good experimental platform scalability and versatility. The device is compatible with different grouting pump types, pressure ranges and grout compositions, and is suitable for experimental research on the transport behavior of various engineering grouting slurries under different working conditions, providing data support for grouting process design and optimization. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0028] Figure 1 This is a schematic diagram of the experimental device proposed in this utility model for simulating grouting in ultra-long boreholes and monitoring changes in grout along the drilling process.

[0029] The components include: 1. Simulated borehole pipe; 2. Grout inlet; 3. Grout outlet; 4. Grouting pump; 5. Pressure sensor; and 6. Flow sensor. Detailed Implementation

[0030] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] The terms “installation,” “connection,” “linking,” and “fixing” used in this application should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, an internal connection between two components, or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances, and they should not be construed as limiting this utility model.

[0033] like Figure 1 As shown, this utility model discloses an experimental device for simulating grouting in ultra-long boreholes and monitoring changes in grout along the drilling process, including a simulated borehole pipe 1 and a flow monitoring component.

[0034] The simulated borehole pipe 1 is used to construct a grouting transport path equivalent to an ultra-long borehole in actual engineering under laboratory conditions. Specifically, the simulated borehole pipe 1 includes several transparent pipe sections, all made of transparent PVC or transparent acrylic round pipes. This ensures strength while facilitating real-time external observation of the grout's flow state, stratification, flocculation, sedimentation, and other physical changes during transport. Furthermore, the pipe's inner diameter can be flexibly configured according to experimental requirements, with common specifications including 50mm, 60mm, 70mm, 80mm, 90mm, and 100mm. Each pipe section is 1-2 meters long, and efficient assembly and sealing are achieved through existing standardized quick-connect fittings combined with sealing rings. This ensures both airtight fluid transport and facilitates system disassembly, assembly, and repeatable testing.

[0035] Furthermore, to save laboratory space and meet the needs of ultra-long-distance simulation, all transparent pipe sections are arranged in a ring-like pattern on a plane, and are assembled in pairs using standardized quick-connect couplings, forming a grouting transport path equivalent to an ultra-long borehole, with a total length of 80-120 meters. For example, Figure 1As shown, the folded arrangement refers to the use of several straight pipe sections connected by quick connectors and elbow components, arranged in a multi-ring pattern on a plane, allowing the device to simulate the grouting path of an ultra-long borehole within a limited experimental space. In this method, all turns in the ring connection of pipe sections are achieved through connectors, without causing any bending or damage to the pipeline body or individual pipe sections, thus maintaining the integrity of the pipeline structure and the continuity of transportation.

[0036] This invention primarily considers that actual ultra-long boreholes may have complex shapes such as bends and diameter changes due to geological conditions. Traditional experimental platforms often use short, straight pipes for simulation, which cannot effectively reproduce the "path-by-path variation trend" of ultra-long boreholes, resulting in significant differences between the grout flow path and the actual working conditions. Therefore, the aforementioned annular pipe design is proposed, which can effectively save laboratory space and can form a linear equivalent channel with real hydraulic characteristics, i.e., a simulated borehole pipe. Grout is injected into one end of the pipe, and the grout will flow along the annular arrangement of the pipes and finally flow out from the other end of the pipe. It can reproduce the flow path and friction-by-path attenuation characteristics of the grout in actual long boreholes. While meeting the simulation requirements of ultra-long distances, it can effectively save laboratory space and realize the simulation and experimentation of grouting conditions in ultra-long boreholes.

[0037] It should be noted that the purpose of the experimental device proposed in this invention is to simulate the "path variation trend" of grouting in ultra-long boreholes, rather than to simulate the precise geometry of ultra-long boreholes. Although the simulated pipeline used in this invention is arranged in a planar ring, there are additional resistances introduced by local bends and connectors. However, these local resistances are known and controllable and will not disrupt the simulation of the overall flow trend of the system. Specifically, the overall transport channel can be made to have hydraulic characteristics and path length equivalent to actual long straight or irregular boreholes by adjusting the total length, diameter, inner wall material, and connection structure of the ring-folded pipeline, thereby simulating the "path variation trend" of grouting in ultra-long boreholes.

[0038] In addition, the simulated borehole pipe 1 is equipped with grouting inlet joints and grouting outlet joints on the transparent pipe sections at both ends. The end of the first pipe section not connected to other pipe sections serves as the grouting inlet 2, which is equipped with a grouting inlet joint connected to a grouting pump 4. The end of the last pipe section not connected to other pipe sections serves as the grouting outlet 3, which is equipped with a grouting outlet joint connected to a recovery container. Preferably, both the grouting inlet joint and the grouting outlet joint adopt a standardized quick-change structure for easy external connection to a grouting pump or pressure source.

[0039] Through the above design, the entire device no longer relies on a complex grout supply and recovery system, simplifying the setup of the grouting and grout discharge sections, focusing solely on simulating the changes in grout properties within the duct, and possessing excellent experimental platform scalability and versatility; the above structure can flexibly adjust parameters such as grouting pressure, flow rate, and concentration to meet the control and testing needs under various grouting conditions, and has high compatibility and scalability.

[0040] Furthermore, in the device proposed in this invention, the flow monitoring component serves as the core, used to acquire the multi-parameter variation characteristics of the grout during the drilling and transportation process. Specifically, several monitoring points are arranged along the simulated drilling pipeline 1 along the length of the grouting transportation path. Each monitoring point is equipped with a set of flow monitoring components, which include a pressure sensor 5 and a flow sensor 6, used to monitor the pressure and flow parameter variation characteristics during the grout transportation process.

[0041] As one implementation method, several monitoring points are set up at equal intervals. For example, multiple monitoring points are set up at equal intervals along the length of a simulated borehole pipeline. Each monitoring point is set up in a group every 5 meters, and the number of monitoring points can be flexibly increased or decreased according to research needs.

[0042] The above design enables monitoring of the pressure, flow rate, and physical properties of the grout at any location during the grouting process of ultra-long boreholes. Equidistant monitoring simplifies the complexity of the analysis.

[0043] Furthermore, at each monitoring point on the pipeline, a standardized quick-connect coupling is connected to the upper part of the pipeline wall. A pressure sensor is installed via this coupling and is used to record the slurry transport pressure at that monitoring point in real time. Each monitoring point on the pipeline is also equipped with an ultrasonic clamp-on flow meter, which is directly clamped to the outside of the pipeline wall and is used to record the slurry flow velocity inside the pipeline at that monitoring point. Preferably, to avoid potential spatial conflicts caused by multiple sensors being installed in the same location, the pressure sensor and flow sensor at each monitoring point on the pipeline are spaced a predetermined distance apart, such as... Figure 1 As shown, the flow sensor is positioned between two adjacent pressure sensors.

[0044] The standardized design of the monitoring interface allows for quick plugging and unplugging and replacement, facilitating maintenance and expansion of sensor types.

[0045] Preferably, all joints and interfaces are assembled using sealing rings. By using sealing rings at all interface locations, pipeline integrity is ensured and system stability is improved.

[0046] Furthermore, the aforementioned device also includes an external data processing module, which is electrically connected to the along-process monitoring component to synchronously acquire the grouting transport pressure and grout flow rate at each monitoring point and analyze the real-time spatial distribution of grout properties.

[0047] The simulated borehole pipe used in this experimental setup is made of transparent material, providing overall visualization capabilities. It allows for direct observation and monitoring of the slurry state at any pipe section, eliminating the need for separate observation windows. It can be equipped with optical lenses or cameras to acquire images of the slurry state and record its changing trends. Furthermore, all monitoring data interfaces are uniformly wired to an external data processing module, enabling simultaneous multi-channel acquisition and digital recording. This multi-channel data acquisition method allows for real-time and accurate acquisition of slurry transport pressure and flow velocity at each monitoring point. It also allows for simultaneous acquisition of slurry pressure and flow velocity information at each monitoring point along the pipeline, enabling real-time spatial distribution analysis of slurry properties.

[0048] The specific working process of this utility model is as follows: Step S1: Constructing the simulated borehole pipe. Select a transparent PVC or acrylic round pipe with an appropriate inner diameter according to the experimental requirements. For routine research, a pipe section with a 70mm inner diameter can be used. Connect individual 1-2 meter long pipe sections sequentially using standardized quick connectors and sealing rings, arranging them in a circular folding pattern on the laboratory floor to ensure the total length reaches the required simulated ultra-long borehole length, such as 100 meters. After connection, check the sealing of each connection point by injecting a suitable amount of water into the pipe to observe for any leakage.

[0049] Step S2: Installation of the flow monitoring components. Along the length of the simulated borehole pipe, a set of monitoring points is set every 5 meters. At each monitoring point, a high-precision pressure sensor is installed via a tee connector, ensuring the pressure sensor is securely installed and the interface is well-sealed to prevent slurry leakage from affecting measurement accuracy. On the pipe section between the two pressure sensors, unlike traditional impeller-type flow meters, this invention uses a non-contact ultrasonic clamp flow meter. Following its installation requirements, it is clamped to the outer wall of the pipe, and its position and angle are adjusted to ensure accurate detection of the flow velocity inside the pipe.

[0050] Step S3: System Connection and Debugging. Connect the grouting inlet connector of the simulated borehole pipe assembly to the grouting pump. The grout outlet connector can be connected to a suitable recovery container or discharge device. Connect all monitoring data interfaces to the external data processing module via unified wiring, and check whether the wiring connections are correct and whether there are any short circuits or open circuits. Turn on the power and start the grouting pump to inject clean water at a low pressure and flow rate to perform preliminary system debugging, checking whether the pressure sensor and flow sensor are working properly, and whether the data acquisition module can accurately collect and record data.

[0051] Step S4: Experimental Operation and Data Acquisition. According to the experimental design, adjust parameters such as pressure, flow rate, and grout concentration of the grouting pump to simulate different grouting conditions. During the experiment, directly observe the grout flow state through a transparent pipe. If any abnormalities are found, adjust the experimental parameters or check the system promptly. Simultaneously, use the data acquisition module to collect real-time pressure and flow rate data at each monitoring point, and record image information of the grout state using a matching optical lens or camera device. After the experiment, organize and analyze the acquired data to study the changes in pressure, flow rate, and physical properties of the grout during its transport within the borehole.

[0052] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. An experimental device for simulating the grouting and monitoring the changes of slurry along the way in a super-long borehole, characterized in that, Includes simulated borehole pipes and along-path monitoring components; The simulated borehole pipeline includes several transparent pipe sections, which are arranged in a ring shape on a plane and assembled in pairs through standardized quick connectors to form a grouting and transportation path equivalent to an ultra-long borehole. Several monitoring points are set up along the simulated borehole pipeline along the length of the grouting transportation path. Each monitoring point is equipped with a set of along-path monitoring components, which include pressure sensors and flow sensors, to monitor the pressure and flow parameter changes during the grout transportation process.

2. The experimental device for simulating the super-long borehole grouting and monitoring the change of slurry along the way according to claim 1, wherein, Several transparent pipe sections are made of transparent PVC round pipe or transparent acrylic round pipe.

3. The experimental device for simulating the super-long borehole grouting and monitoring the change of slurry along the way according to claim 1, wherein, The simulated borehole pipe is equipped with a grouting inlet joint and a grouting outlet joint on the transparent pipe sections located at the beginning and end, respectively. Among them, the end of the first pipe section that is not connected to other pipe sections serves as the grout inlet. The grout inlet is equipped with a grouting inlet connector, which is connected to a grouting pump. The end of the tail section that is not connected to other sections serves as the slurry outlet. The slurry outlet is equipped with an outlet connector, which is connected to the recovery container.

4. The experimental device for simulating the super-long borehole grouting and monitoring the change of slurry along the way according to claim 3, wherein, Both the grouting inlet connector and the grout outlet connector adopt a standardized quick-change structure.

5. The experimental device for simulating the super-long borehole grouting and monitoring the change of slurry along the way according to claim 1, wherein, Several monitoring points were set up at equal intervals.

6. The experimental device for simulating the super-long borehole grouting and monitoring the change of slurry along the way according to claim 1, wherein, The pressure sensor and flow sensor installed at each monitoring point on the pipeline are spaced at a predetermined distance.

7. The experimental device for simulating the super-long borehole grouting and monitoring the change of slurry along the way according to claim 1, characterized in that, At each monitoring point on the pipeline, a standardized quick connector is connected to the upper part of the pipeline wall. A pressure sensor is installed through the standardized quick connector and is used to record the slurry transport pressure at that monitoring point in real time.

8. The experimental apparatus for simulating the super-long borehole grouting and monitoring the changes of the slurry along the way according to claim 1, wherein, An ultrasonic clamp-on flow meter is installed at each monitoring point on the pipeline. The ultrasonic clamp-on flow meter is directly clamped to the outside of the pipeline wall and is used to record the flow velocity of the slurry inside the pipeline at the monitoring point.

9. The experimental device for simulating the super-long borehole grouting and monitoring the change of slurry along the way according to claim 7 or 8, characterized in that, All joints and interfaces are assembled using sealing rings.

10. The experimental setup for simulating the super-long borehole grouting and monitoring the changes in the slurry along the way according to claim 1, wherein, The device also includes an external data processing module; the data processing module is electrically connected to the along-the-line monitoring component and is used to synchronously acquire the grouting transport pressure and grout flow rate at each monitoring point and analyze the real-time spatial distribution of grout properties.

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