A device and method for monitoring deep horizontal displacement in soft soil foundation treatment

Abstract

This invention discloses a deep horizontal displacement monitoring device and method for soft soil foundation treatment, including a clinometer tube, a protective sealing tube coaxially installed inside the clinometer tube, a plurality of horizontal displacement monitoring mechanisms spaced apart inside the protective sealing tube, and a side support mechanism on each horizontal displacement monitoring mechanism. The protective sealing tube includes an inflatable inner tube and an inflatable outer tube coaxially arranged. Each horizontal displacement monitoring mechanism includes an acoustic ranging sensor and an inclination sensor installed inside the inflatable inner tube, configured to monitor the distance and inclination angle of the previous horizontal displacement monitoring mechanism. The side support mechanism is configured to fit against the inner side of the clinometer tube during operation, transmitting the force at the corresponding position of the clinometer tube to the horizontal displacement monitoring mechanism. By causing the protective sealing tube to deform synchronously through the clinometer tube, the deep horizontal displacement of the soft soil foundation can be monitored, ensuring the validity of the data.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering monitoring technology for soft soil foundation treatment, specifically to a deep horizontal displacement monitoring device and method for soft soil foundation treatment. Background Technology

[0002] Existing land resources constrain economic development. With the integration of water and sea transport, cities are increasingly focusing their development on areas closer to the coast. However, the original soil in these areas is mostly soft soil, characterized by high water content, high compressibility, low strength, and low permeability, resulting in poor physical properties. Therefore, foundation reinforcement is necessary to meet the needs of subsequent construction. In soft soil foundation treatment projects in the southeastern coastal areas, surcharge preloading is commonly used. This method is economical, practical, and technically feasible. It involves setting up a cofferdam outside the site and surcharge preloading on the foundation surface inside the site. This forces pore water in the soil to rise and escape to the surface along the grooves of the plastic sheeting, accelerating the settlement process of the soft soil foundation. This allows the reinforced soil to drain and consolidate, increasing its strength and achieving the purpose of foundation reinforcement. However, this method results in a slow increase in foundation strength during reinforcement. If the applied load is too rapid or excessive during construction, the soil strength may not have reached the level required to withstand the load, leading to deep landslides or cofferdam collapses. This not only delays the construction period but also increases economic costs. Therefore, effectively controlling the quality of soft soil foundation treatment projects and ensuring the safety and stability of the site's foundation is a problem that must be solved.

[0003] Setting up deep horizontal displacement monitoring of soil is to understand the changes in deep horizontal displacement of the foundation soil around the site in a timely manner during the treatment of soft soil foundation. By monitoring the deep horizontal displacement of the cofferdam soil or the surrounding soil, the law of deep horizontal displacement change can be grasped in a timely and effective manner, thereby determining the next loading time and avoiding deep landslides or cofferdam collapses caused by excessive or rapid construction loads.

[0004] Currently, deep horizontal displacement of soil is monitored by drilling inclinometers outside the loading zone or at the toe of the cofferdam slope, with the drilling depth reaching the stationary layer. The inclinometer is then manually pulled from inside the tube to monitor the deep horizontal displacement. For surcharge preloading foundation treatment projects, inclinometers should be drilled and installed around the site. However, this process presents several challenges. First, it requires monitoring personnel to manually pull the inclinometer to test the tubes. Each tube requires two separate tests: one forward and one reverse (rotating 180 degrees on top of the forward test). This, coupled with the depth of the inclinometer holes and the large site area preventing vehicle access, significantly increases the workload for monitoring personnel. Second, inclinometers are mostly made of PVC and ABS, reflecting deep horizontal deformation of the soil through bending caused by the material's deformation within the soil. If the joints are not properly sealed, silt can enter and block the tube, or if the deformation is significant, the inclinometer may break at the joint or in the middle, preventing the insertion of the inclinometer and thus hindering the monitoring of deep horizontal displacement of the foundation soil, ultimately making it impossible to assess the safety and stability of the foundation soil.

[0005] The patent number is CN202310912488.4, and the patent name is an inclinometer. It is equipped with a flip plate, and a counting sensor is connected to the controller to record the number of times the flip plate flips. It can automatically lay out lines and record data accurately. However, it cannot solve the problems of multiple holes and the inability of vehicles to travel on site. Compared with commonly used inclinometers, the device has more devices such as flip plates, making it difficult for monitoring personnel to carry the monitoring device.

[0006] The patent, numbered CN202311610042.2 and named "Automated Inclinometer," improves work efficiency by using an electric motor to automatically wind the cord instead of the traditional manual lifting method. However, the presence of a motor increases the weight of the instrument, making it more difficult to carry and increasing the workload of monitoring personnel.

[0007] Existing technology achieves automatic data acquisition by installing fixed inclinometers, which place multiple inclinometer sensors inside the inclinometer tube. However, the installation process of fixed inclinometers is quite cumbersome, requiring the sensors to be connected one by one. Furthermore, during the lowering process, the connecting rods and sensors are easily dropped due to their weight, causing injury to the installers. This also requires a high level of technical expertise. Therefore, there is an urgent need for a deep horizontal displacement monitoring device and method for soft soil foundation treatment to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a device and method for monitoring deep horizontal displacement in soft soil foundation treatment, which can effectively solve the problems existing in the prior art.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a deep horizontal displacement monitoring device for soft soil foundation treatment, comprising:

[0010] Inclinometer tubes are pre-embedded at the location to be measured, extending at least to the unmoved soil layer.

[0011] A protective sealing tube, coaxially installed inside the inclinometer tube, the protective sealing tube comprising a coaxially arranged inner inflation tube and an outer inflation tube; and

[0012] The protective sealing tube is provided with a number of horizontal displacement monitoring mechanisms at intervals. Each horizontal displacement monitoring mechanism includes an acoustic ranging sensor and an tilt sensor installed in the inflatable inner tube. The acoustic ranging sensor and the tilt sensor are configured to monitor the distance and tilt angle of the previous horizontal displacement monitoring mechanism.

[0013] Each of the horizontal displacement monitoring mechanisms is provided with a side support mechanism, which is configured to fit against the inside of the inclinometer tube during operation and transmit the force at the corresponding position of the inclinometer tube to the horizontal displacement monitoring mechanism.

[0014] Preferably, the protective sealing tube is equipped with an air pipe connector at its top end, and the air pipe connector is provided with a one-way valve structure. The air pipe connector is used to connect to an external pressurization device to inflate the inner and outer inflation tubes as needed.

[0015] Preferably, the horizontal displacement monitoring mechanism further includes a pair of waterproof connectors, which are installed at intervals inside the inflatable inner tube, and the two waterproof connectors and the inside of the inflatable inner tube together form a sealed chamber, and the acoustic ranging sensor and the tilt sensor are installed inside the sealed chamber.

[0016] Preferably, the side support mechanism includes a plurality of support shafts evenly arranged circumferentially, one end of each support shaft being connected to the horizontal displacement monitoring mechanism, and the other end extending out of the inflatable outer tube; and

[0017] The inclinometer tube has several channels inside, which are configured to allow support shafts to slide into and guide each support shaft to move along a route.

[0018] Preferably, the side support mechanism further includes a plurality of support ribs evenly arranged circumferentially, the support ribs being radially arranged inside the inner inflation tube and / or the outer inflation tube, and the support ribs having the following features along their inner edges:

[0019] Multiple support blocks are connected radially within the support ribs, and adjacent support blocks are movably connected.

[0020] The central inflation strip runs through all the support blocks and is connected to the inner or outer inflation tube. When inflated, the central inflation strip controls all the support blocks to be distributed radially collinearly.

[0021] Preferably, a counterweight base is installed at the bottom of the protective sealing tube, and several support shafts are also evenly installed on the counterweight base along the circumference. The counterweight base is configured to guide the protective sealing tube into the inclinometer tube under the action of gravity.

[0022] Preferably, the inclinometer tube has a slot at its bottom, the counterweight base has an insert block at its bottom, and the insert block has a locking mechanism. The locking mechanism is configured to lock the counterweight base to the slot when the inner and outer inflatable tubes are inflated, or to unlock the counterweight base to the slot when the inner and outer inflatable tubes are deflated.

[0023] Preferably, the locking mechanism includes a plurality of locking beads arranged circumferentially along the insert block, a shaped block is slidably installed inside the insert block, an elastic airbag is installed at one end of the shaped block, the elastic airbag is connected to the inner or outer inflatable tube, and a plurality of locking holes are correspondingly provided on the inner wall of the slot; the elastic airbag is configured as follows:

[0024] In its natural state, the irregular block is moved to the first position by its own elasticity, and the locking bead can freely disengage from the locking hole and retract into the insert block;

[0025] When inflated, the irregular block is pushed to the second position, and the portion of the irregular block in the second position that presses the locking bead out of the insert and gets into the locking hole.

[0026] This invention also discloses a method for monitoring deep horizontal displacement in soft soil foundation treatment, which is based on a deep horizontal displacement monitoring device for soft soil foundation treatment, specifically including:

[0027] S1. Assemble the horizontal displacement monitoring device and inflate the inner and outer inflatable tubes to ensure that the support shaft is in full contact with the inner wall of the inclinometer tube and that all support blocks are distributed collinearly along the radial direction.

[0028] S2. Connect the data from each horizontal displacement monitoring mechanism to the automatic data acquisition device;

[0029] S3. From bottom to top, monitor the acoustic ranging sensor data and tilt angle sensor data of the counterweight chassis through the first horizontal displacement monitoring mechanism, and calculate the distance L′ and tilt angle Δ of the first horizontal displacement monitoring mechanism;

[0030] S4. Obtain data from each horizontal displacement monitoring mechanism sequentially from bottom to top, and calculate:

[0031] Horizontal displacement values ​​of each horizontal displacement monitoring unit:

[0032]

[0033] Where si is the i-th horizontal displacement monitoring mechanism from bottom to top, and n is the number of horizontal displacement monitoring mechanisms;

[0034] Depth values ​​for each horizontal displacement monitoring device:

[0035]

[0036] The horizontal displacement values ​​of adjacent horizontal displacement monitoring mechanisms are adjusted in real time based on the depth value.

[0037] S5. Statistically analyze the horizontal displacement values, calculate the horizontal displacement rate, and plot the deep horizontal displacement curve.

[0038] Preferably, based on the data from the acoustic ranging sensor, the distance L′ between the two horizontal displacement monitoring mechanisms above and below the acoustic ranging sensor is calculated using the following formula: L′=v*t / 2, where v is the velocity of the sound wave and t is the transmission to reception time; si=L′sin(Δ); hi=L′cos(Δ).

[0039] Beneficial effects: In this invention, by burying an inclinometer tube as a protective outer tube, the device of this invention can be protected. By causing the protective sealing tube to deform synchronously through the inclinometer tube, the deep horizontal displacement of the soft soil foundation can be monitored, ensuring the validity of the data.

[0040] The installation process does not require the cumbersome installation of a fixed inclinometer. The device is simply placed inside the inclinometer tube and pressurized externally. When fully pressurized, the protective sealing tube from the bottom to the top of the inclinometer tube changes from a loose state to a vertical state. Furthermore, the side support mechanism in the horizontal displacement monitoring mechanism is connected to the inclinometer tube, ensuring that the device remains vertical inside the inclinometer tube, thus guaranteeing the integrity and usability of the device.

[0041] The horizontal displacement monitoring mechanism can measure the distance and tilt angle between the front and rear devices in real time, and correct horizontal deformation at different depths in real time. Compared with existing monitoring methods, it ensures the real-time, authenticity and applicability of the data. In addition, the device of this invention records the monitoring of deep horizontal displacement of the foundation of the site, so that the deep horizontal displacement of the foundation of the surcharge preloading site is not limited by inconvenient site transportation, unfavorable construction site environment and extreme weather. It can guide the construction surcharge rate in a timely and effective manner, greatly improving work efficiency. The automated acquisition function greatly improves the timeliness and accuracy of the data. Attached Figure Description

[0042] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0043] In the attached diagram:

[0044] Figure 1 This is a schematic diagram of the horizontal displacement monitoring device of the present invention;

[0045] Figure 2 This is a schematic diagram of the horizontal displacement monitoring mechanism of the present invention;

[0046] Figure 3 This is a top view of the horizontal displacement monitoring device of the present invention;

[0047] Figure 4 This is a schematic diagram of the counterweight chassis of the present invention;

[0048] Figure 5 This is a schematic diagram of the operation of the horizontal displacement monitoring device of the present invention;

[0049] Figure 6 This is a schematic diagram of the horizontal displacement monitoring mechanism of the present invention when it deviates;

[0050] The following are the labeling elements in the diagram: 1. Inclinometer tube; 21. Inflatable inner tube; 22. Inflatable outer tube; 23. Air tube connector; 31. Acoustic ranging sensor; 32. Tilt sensor; 33. Waterproof connector; 41. Support shaft; 42. Support rib; 43. Support block; 44. Central inflation strip; 5. Channel; 6. Counterweight chassis; 61. Insert block; 7. Groove; 71. Locking hole; 81. Locking bead; 82. Irregular block; 83. Elastic airbag. Detailed Implementation

[0051] The embodiments of the present invention will now be described with reference to the accompanying drawings. The terminology used in the embodiments section is for illustrative purposes only and is not intended to limit the scope of the invention. The embodiments of this application will now be described with reference to the accompanying drawings.

[0052] Example 1:

[0053] like Figure 1 As shown, a deep horizontal displacement monitoring device for soft soil foundation treatment includes an inclinometer tube 1, a protective sealing tube, a plurality of horizontal displacement monitoring mechanisms spaced apart inside the protective sealing tube, and a side support mechanism on each horizontal displacement monitoring mechanism.

[0054] refer to Figure 1 As shown, inclinometer tube 1 is pre-embedded at the location to be measured, with a depth extending at least to the immovable soil layer;

[0055] In a specific case, a φ70mm inclinometer tube 1 is used, with an outer diameter of 70 mm, a wall thickness of 5 mm, and a rod length of 1000-2000 mm, especially 1000 mm; each of the φ70mm inclinometer tube 1 has a threaded connection at the joints, as well as at the top and bottom, and is coated with silicone sealant;

[0056] refer to Figure 1As shown, the protective sealing tube is coaxially installed inside the inclinometer tube 1. The protective sealing tube includes an inner inflation tube 21 and an outer inflation tube 22, which are coaxially arranged. An air pipe connector 23 is installed at the top of the protective sealing tube, and the air pipe connector 23 is equipped with a one-way valve structure to ensure that the gas does not leak out during inflation. The air pipe connector 23 is used to connect to an external pressure testing device to inflate the inner inflation tube 21 and the outer inflation tube 22 as needed.

[0057] refer to Figures 1-2 As shown, the horizontal displacement monitoring mechanism includes an acoustic ranging sensor 31 and an inclination sensor 32 disposed in the inflatable inner tube 21. For example, the inclination sensor 32 (204) has a range of 0-360°, a resolution of 0.002°, and an accuracy of 0.01°. The acoustic ranging sensor 31 and the inclination sensor 32 are configured to monitor the distance and inclination of the previous horizontal displacement monitoring mechanism.

[0058] Among them, reference Figures 1-2 As shown, the horizontal displacement monitoring mechanism also includes a pair of waterproof connectors 33. The two waterproof connectors 33 are installed at intervals inside the inflatable inner tube 21, and the two waterproof connectors 33 and the inside of the inflatable inner tube 21 together form a sealed chamber. The acoustic ranging sensor 31 and the tilt sensor 32 are installed inside the sealed chamber.

[0059] refer to Figure 2-Figure 3 As shown, the side support mechanism is configured to fit against the inside of the inclinometer tube 1 during operation, and transmit the force at the corresponding position of the inclinometer tube 1 to the horizontal displacement monitoring mechanism. The side support mechanism includes several support shafts 41 evenly arranged along the circumference. One end of the support shaft 41 is connected to the horizontal displacement monitoring mechanism, and the other end extends out of the inflation tube 22. Several channels 5 are provided inside the inclinometer tube 1. The channels 5 are configured to allow the support shafts 41 to slide into and guide each support shaft 41 to move along the route.

[0060] Additionally, refer to Figure 3 As shown, the side support mechanism also includes several support ribs 42 evenly arranged circumferentially. The support ribs 42 are arranged radially inside the inner inflation tube 21 and / or the outer inflation tube 22. The support ribs 42 are provided with a central inflation strip 44 and multiple support blocks 43. The multiple support blocks 43 are connected radially in sequence inside the support ribs 42, and adjacent support blocks 43 are movably connected. The central inflation strip 44 passes through all support blocks 43 and is connected to the inner inflation tube 21 or the outer inflation tube 22. When inflated, the central inflation strip 44 controls all support blocks 43 to be collinearly distributed radially.

[0061] by Figure 3For example, the support block 43 has a triangular structure. The apex of one triangular support block 43 is movably connected to the midpoint of the base of the next triangular support block 43. In the uninflated state, each support block 43 can rotate and fold freely. When inflated, the sides of the support rib 42 expand and compress, reducing the movement space of the support blocks 43 and gradually guiding each support block 43 to be arranged in a straight line. At the same time, the central inflation strip 44 expands, further driving each support block 43 to be arranged in a straight line. (Refer to...) Figure 3 As shown, when the bottom edge of the outermost support block 43 is subjected to force, it will be transmitted to the next triangular support block 43 through the top corner. This process is repeated to rigidly transfer the force from the outermost layer to the inner side, thereby improving the synchronicity of the force on the inner side.

[0062] refer to Figure 1 and Figure 4 As shown, a counterweight base 6 is installed at the bottom of the protective sealing tube. Several support shafts 41 are also evenly installed on the counterweight base 6 along the circumferential direction. The counterweight base 6 is configured to guide the protective sealing tube into the inclinometer tube 1 under the action of gravity. The bottom of the inclinometer tube 1 is provided with a slot 7. An insert block 61 is installed at the bottom of the counterweight base 6, and a locking mechanism is installed on the insert block 61. The locking mechanism is configured to lock the counterweight base 6 and the slot 7 when the inner inflatable tube 21 and the outer inflatable tube 22 are inflated, or to unlock the counterweight base 6 and the slot 7 when the inner inflatable tube 21 and the outer inflatable tube 22 are deflated.

[0063] In a specific example, the locking mechanism includes several locking beads 81 arranged circumferentially along the insert block 61. Holes are provided on the surface of the insert block 61, and the locking beads 81 are installed within these holes, ensuring that the locking beads 81 do not detach from the insert block 61. A shaped block 82 is slidably installed within the insert block 61. The shaped block 82 has a structure such as a frustum shape and a gradually changing side surface. The gradually changing side surface compresses and moves the locking beads 81. An elastic airbag 83 is installed at one end of the shaped block 82, and the elastic airbag 83 communicates with the inner inflation tube 21 or the outer inflation tube 22. Several locking holes 71 are correspondingly provided on the inner wall of the slot 7. The elastic airbag 83 is configured as follows:

[0064] In its natural state, the elasticity of the block 82 pulls the irregular block 82 to the first position, and the locking bead 81 can freely disengage from the locking hole 71 and retract into the insert block 61;

[0065] When inflated, push the irregular block 82 to the second position. The irregular block 82 in the second position squeezes the locking bead 81 part out of the insert block 61 and gets into the locking hole 71.

[0066] Based on the above, the installation process of the device of the present invention is as follows:

[0067] Step 1: Before the surcharge preloading construction of the soft soil foundation, the location is determined. Drilling is carried out at the design required location to a depth until the stable soil layer is reached. Then, inclinometer tube 1 is buried with a bottom cover. The bottom of inclinometer tube 1 is placed in the stable soil layer, which can ensure that inclinometer tube 1 is fixed and vertical, and is perpendicular to the soil. It will not sink or settle, and plays a benchmark control role.

[0068] Step 2: Based on the length of the inclinometer tube 1, evenly distribute the positions of the horizontal displacement monitoring mechanism according to the tube length, and connect the horizontal displacement monitoring mechanism, the protective sealing tube, and the counterweight base 6 to form a whole;

[0069] Step 3: Align the support shaft 41 with the inner channel 5 of the inclinometer tube 1, and slowly place the counterweight plate 6 along the inside of the tube. The counterweight plate 6 has a certain weight, and with the support shaft 41 aligned with the inner channel 5 of the inclinometer tube 1 during placement, the entire assembly process will not result in knots or tangles.

[0070] Step 4: After the counterweight chassis 6 reaches the bottom of the inclinometer tube 1, the insert block 61 is inserted into the slot 7. The air pipe connector 23 is connected to an external pressure testing device to inflate the inner air pipe 21 and the outer air pipe 22 from empty to full. The inner air pipe 21 and the outer air pipe 22 are fully pressurized by air pressure. At the same time, the following levels of support are completed:

[0071] The air pressure fills the inner and outer tubes of the inflatable tube 21 and the outer tube 22, causing the support shaft 41 to fully contact the inner wall of the channel 5 of the inclinometer tube 1. As the air pressure increases, the protective sealing tube gradually changes from a loose state to a vertical state from the bottom to the top. The support shaft 41 slides slowly upward along the support shaft 41 until the entire protective sealing tube becomes vertical and all parts are in a fully pressurized working state.

[0072] The elastic airbag 83 presses up with air pressure, pushing the irregular block 82 to slide to the second position. The irregular block 82 squeezes the locking bead 81 part out of the insert block 61 and gets into the locking hole 71, thereby locking the counterweight chassis 6 position.

[0073] Each support rib 42 is inflated, and the central air strip 44 is inflated simultaneously to control all support blocks 43 to be distributed collinearly along the radial direction.

[0074] Step 5: Install an automatic data acquisition device at the top of the pipe to automatically collect test data from each horizontal displacement monitoring mechanism.

[0075] Example 2:

[0076] This invention also discloses a method for monitoring deep horizontal displacement in soft soil foundation treatment. Based on the installation of the aforementioned device, it achieves fully automated monitoring of deep horizontal displacement in soft soil foundations at surcharge preloading sites, specifically including:

[0077] S1. Assemble the horizontal displacement monitoring device according to the above operation, and inflate the inner tube 21 and the outer tube 22 with air so that the support shaft 41 is in full contact with the inner wall of the inclinometer tube 1 and all the support blocks 43 are distributed along the radial line.

[0078] S2. Connect the data of each horizontal displacement monitoring mechanism to the automatic acquisition device. Data can be copied from the automatic acquisition device using a USB flash drive or other means, or wireless data transmission can be used. By installing a wireless transmission module in the automatic acquisition device, wireless data transmission can be achieved. Data acquisition and transmission can be carried out by adjusting parameters such as the data acquisition cycle according to the on-site load accumulation construction cycle.

[0079] S3, Reference Figure 5 As shown, during the surcharge preloading process, the soil will displace outwards, such as... Figure 5 As shown, the deformation of the inclinometer tube 1 is the deep horizontal displacement of the foundation soil. The inclinometer tube 1 is tightly supported and contacted by the support shaft 41, which causes the protective sealing tube and the horizontal displacement monitoring mechanism to also undergo certain deformation. After deformation, the acoustic distance sensor 31 and the tilt sensor 32 in the horizontal displacement monitoring mechanism perform distance and tilt tests on the horizontal displacement monitoring device in front.

[0080] S4. During the soil deformation process, monitor the deep horizontal displacement of the foundation, referring to... Figure 6 As shown, the distance between the protective sealing tubes between the two horizontal displacement monitoring mechanisms is L when the tubes are fully pressurized. After deformation, the protective sealing tubes will have a certain tensile deformation, that is, the distance between the protective sealing tubes between the two horizontal displacement monitoring mechanisms in the deformed state is L′, where L′ is L (original length) + ΔL (expansion and contraction deformation). That is, the depth corresponding to the initial point is constantly changing with the deformation. The acoustic ranging sensor 31 can calculate the distance L′ between the two horizontal displacement monitoring mechanisms by generating acoustic waves, where L′ = v*t / 2, v is the acoustic velocity, and t is the transmission to reception time. Through the data of the tilt sensor 32, the change in tilt angle Δ between the two horizontal displacement monitoring mechanisms can be calculated. Based on the change in tilt angle and the distance after the change, the horizontal displacement value s of the two horizontal displacement monitoring mechanisms is calculated, with the formula: si = L′sin(Δ). The relative height h is also changing during the process, hi = L′cos(Δ). The depth value corresponding to the device can be corrected in real time, thereby ensuring the accuracy and authenticity of the data.

[0081] S5. From bottom to top, monitor the data from the acoustic ranging sensor 31 and tilt sensor 32 of the counterweight chassis using the first horizontal displacement monitoring mechanism, and calculate the distance L′ and tilt angle Δ of the first horizontal displacement monitoring mechanism; from bottom to top, acquire data from each horizontal displacement monitoring mechanism sequentially, and calculate:

[0082] Horizontal displacement values ​​of each horizontal displacement monitoring unit:

[0083]

[0084] Where si is the i-th horizontal displacement monitoring mechanism from bottom to top, and n is the number of horizontal displacement monitoring mechanisms;

[0085] Depth values ​​for each horizontal displacement monitoring device:

[0086]

[0087] The automated acquisition of deep horizontal displacement data in soft soil foundations under surcharge preloading summarizes and organizes the deep horizontal settlement data of the foundation during the surcharge preloading construction process. The monitoring results of deep horizontal displacement are compiled to produce information such as the horizontal displacement of each measuring point, the horizontal displacement rate of each measuring point, and the deep horizontal displacement curve. This provides data support to ensure the safety and stability of the foundation during the surcharge preloading construction process and plays an important guiding role in the quality of the entire construction process.

[0088] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. For those skilled in the art, after learning the contents described in the present invention, several equivalent changes and substitutions can be made without departing from the principle of the present invention. These equivalent changes and substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A device for monitoring deep horizontal displacement in soft soil foundation treatment, characterized in that, include: Inclinometer tubes are pre-embedded at the location to be measured, extending at least to the unmoved soil layer. A protective sealing tube, coaxially installed inside the inclinometer tube, the protective sealing tube comprising a coaxially arranged inner inflation tube and an outer inflation tube; and The protective sealing tube is provided with a number of horizontal displacement monitoring mechanisms at intervals. Each horizontal displacement monitoring mechanism includes an acoustic ranging sensor and an tilt sensor installed in the inflatable inner tube. The acoustic ranging sensor and the tilt sensor are configured to monitor the distance and tilt angle of the previous horizontal displacement monitoring mechanism. Each of the horizontal displacement monitoring mechanisms is provided with a side support mechanism, which is configured to fit against the inside of the inclinometer tube during operation and transmit the force at the corresponding position of the inclinometer tube to the horizontal displacement monitoring mechanism. The side support mechanism includes several support shafts evenly arranged circumferentially, one end of each support shaft being connected to the horizontal displacement monitoring mechanism, and the other end extending out of the inflatable outer tube; and The inclinometer tube has several channels inside, which are configured to allow support shafts to slide into and guide each support shaft to move along a route. The side support mechanism further includes a plurality of support ribs evenly arranged circumferentially, the support ribs being radially arranged inside the inner inflation tube and / or the outer inflation tube, and the support ribs having the following features along their inner edges: Multiple support blocks are connected radially in sequence within the support ribs, and adjacent support blocks are movably connected. The central inflation strip runs through all the support blocks and is connected to the inner or outer inflation tube. When inflated, the central inflation strip controls all the support blocks to be distributed radially collinearly.

2. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 1, characterized in that: The protective sealing tube is equipped with an air pipe connector at its top end, and the air pipe connector is equipped with a one-way valve structure. The air pipe connector is used to connect to an external pressure testing device to inflate the inner and outer inflation tubes as needed.

3. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 1, characterized in that: The horizontal displacement monitoring mechanism also includes a pair of waterproof connectors. The two waterproof connectors are installed at intervals inside the inflatable inner tube, and the two waterproof connectors and the inside of the inflatable inner tube together form a sealed chamber. The acoustic ranging sensor and the tilt sensor are installed inside the sealed chamber.

4. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 2, characterized in that: The bottom of the protective sealing tube is equipped with a counterweight base, and several support shafts are also evenly installed on the counterweight base along the circumference. The counterweight base is configured to guide the protective sealing tube into the inclinometer tube under the action of gravity.

5. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 4, characterized in that: The bottom of the inclinometer tube is provided with a slot, and the bottom of the counterweight base is equipped with a plug, and the plug is equipped with a locking mechanism. The locking mechanism is configured to lock the counterweight base to the slot when the inner and outer inflatable tubes are inflated, or to unlock the counterweight base to the slot when the inner and outer inflatable tubes are deflated.

6. The deep horizontal displacement monitoring device for soft soil foundation treatment according to claim 5, characterized in that: The locking mechanism includes a plurality of locking beads arranged circumferentially along the insert block. A shaped block is slidably installed inside the insert block. An elastic airbag is installed at one end of the shaped block. The elastic airbag is connected to the inner or outer inflatable tube. A plurality of locking holes are correspondingly provided on the inner wall of the slot. The elastic airbag is configured as follows: In its natural state, the irregular block is moved to the first position by its own elasticity, and the locking bead can freely disengage from the locking hole and retract into the insert block; When inflated, the irregular block is pushed to the second position, and the portion of the irregular block in the second position that presses the locking bead out of the insert and gets into the locking hole.

7. A method for monitoring deep horizontal displacement in soft soil foundation treatment, characterized in that, Monitoring is performed using the deep horizontal displacement monitoring device for soft soil foundation treatment as described in any one of claims 4-6, specifically including: S1. Assemble the horizontal displacement monitoring device and inflate the inner and outer inflatable tubes to ensure that the support shaft is in full contact with the inner wall of the inclinometer tube and that all support blocks are distributed collinearly along the radial direction. S2. Connect the data from each horizontal displacement monitoring mechanism to the automatic data acquisition device; S3. From bottom to top, monitor the acoustic ranging sensor data and tilt angle sensor data of the counterweight chassis through the first horizontal displacement monitoring mechanism, and calculate the distance L′ and tilt angle Δ of the first horizontal displacement monitoring mechanism; The horizontal displacement values ​​of the two horizontal displacement monitoring mechanisms, based on the distance L′ and the changing tilt angle Δ, are obtained using the following formula: s i =L′sin(Δ); S4. Obtain data from each horizontal displacement monitoring mechanism sequentially from bottom to top, and calculate: Horizontal displacement values ​​of each horizontal displacement monitoring unit: Among them, s i Let n be the i-th horizontal displacement monitoring mechanism from bottom to top, and n be the number of horizontal displacement monitoring mechanisms. Depth values ​​for each horizontal displacement monitoring device: The horizontal displacement values ​​of adjacent horizontal displacement monitoring mechanisms are adjusted in real time based on the depth value. S5. Statistically analyze the horizontal displacement values, calculate the horizontal displacement rate, and plot the deep horizontal displacement curve.

8. The method for monitoring deep horizontal displacement in soft soil foundation treatment according to claim 7, characterized in that: Based on the data from the acoustic ranging sensor, the distance L′ between the two horizontal displacement monitoring mechanisms above and below the acoustic ranging sensor is calculated using the formula: L′=v*t / 2, where v is the velocity of the sound wave and t is the transmission-to-reception time; s i =L′sin(Δ); h i =L′cos(Δ).

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