A method for constructing a sealing wall for soft soil foundations

Abstract

This invention relates to the field of soft soil foundation construction, and more particularly to a method for constructing a sealing wall for soft soil foundations. The invention involves marking several detection points in the target construction area, performing jet impact testing on these points to determine the soil's impact sensitivity characteristics, and then determining the impact sensitivity characterization value of the soil within the target construction area based on these characteristics to classify the soil within the target construction area into impact sensitivity categories. A drilling rig is used to drill a grouting pipe with a nozzle into a predetermined location in the soil within the target construction area. Based on the impact sensitivity category, the drilling rig's operation is controlled to grout the soil, forming a solidified sealing wall column. If the soil is weakly sensitive, the drilling bit's lifting speed and the nozzle's jet intensity are adjusted simultaneously. This overcomes the problem of varying soil impact sensitivity affecting the construction process, thereby improving the construction quality and efficiency of sealing wall construction on soft soil foundations.

Description

Technical Field

[0001] This invention relates to the field of soft soil foundation construction, and more particularly to a method for constructing a sealing wall for soft soil foundations. Background Technology

[0002] Soft soil foundations typically exhibit high compressibility, low strength, and high water content, posing numerous challenges to engineering construction. Sealing walls for soft soil foundations are a construction technique specifically designed to address these characteristics. To improve the bearing capacity and stability of soft soil foundations, various construction methods can be employed, among which sealing wall construction methods have gained attention due to their effectiveness and environmental friendliness.

[0003] Chinese Patent Publication No. CN114753347A discloses a method and foundation structure for treating grid-type soft soil foundations, including a grid-type solidification wall and a hard shell layer fixedly installed on the grid-type solidification wall. Multiple wall columns are fixedly installed on the grid-type solidification wall, arranged symmetrically. Each wall column has an installation cavity. The grid-type solidification wall has multiple feed holes communicating with the installation cavities, and the wall columns have multiple water outlet holes arranged at equal intervals. The hard shell layer has multiple through holes communicating with corresponding installation cavities, and multiple sealing components are provided on the hard shell layer.

[0004] However, the following problems still exist in the existing technology:

[0005] The soil in different regions has different impact sensitivities, which affect the shearing, disturbance and damage to the soil in the high-pressure jet cement process, and affect the grouting process and the quality of the formed sealed wall column consolidation. Summary of the Invention

[0006] Therefore, the present invention provides a method for constructing a sealing wall on a soft soil foundation, which overcomes the problem in the prior art that the different impact sensitivities of soil in different areas affect the shearing, disturbance and damage to the soil in the high-pressure jet cement process, thus affecting the grouting process and the quality of the solidified sealing wall column.

[0007] To achieve the above objectives, the present invention provides a method for constructing a sealing wall for soft soil foundations, comprising:

[0008] Several testing points are marked in the target construction area. Jet impact testing is carried out at the testing points to determine the soil’s impact sensitivity characteristics. This includes excavating a pre-test pit at a predetermined depth at the testing point, impacting the bottom of the pre-test pit with a predetermined water flow intensity, and testing the depth of the pit obtained by the impact and the collapse area of ​​the pit’s edge.

[0009] Based on the aforementioned soil shock sensitivity characteristics, the shock sensitivity characterization value of the soil in the target construction area is determined, so as to classify the shock sensitivity category of the soil in the target construction area;

[0010] A drilling rig is used to drill a grouting pipe with a nozzle into a predetermined location in the soil within the target construction area. The drilling rig's operation is controlled based on the impact sensitivity category to grout the soil, forming a sealed wall-column consolidation body.

[0011] Based on the impact sensitivity index, the lifting speed of the drill bit and the injection intensity of the nozzle are adjusted simultaneously. The height of the grout level in the borehole is continuously monitored. Based on the height, it is determined whether the grouting meets the predetermined standard, so as to adjust the rotation speed of the drill bit.

[0012] Alternatively, grouting can be completed by maintaining the drilling speed of the drill bit and the spray intensity of the nozzle.

[0013] Furthermore, the process of detecting the area of ​​collapse at the edge of the cave includes,

[0014] The bottom of the pre-detection pit is impacted with a predetermined water flow intensity for a predetermined duration;

[0015] Images were taken of the area where the hole was created by the impact.

[0016] The concave contour in the image is calibrated, the area of ​​the concave contour is determined, and the collapsed area of ​​the hole edge is obtained.

[0017] Furthermore, determining the impact sensitivity characterization values ​​of the soil within the target construction area based on the aforementioned soil impact sensitivity characteristics includes,

[0018] The ratio of the cavity depth to a preset standard threshold for cavity depth is determined as the first impact-sensitive feature;

[0019] The ratio of the collapsed area at the edge of the cavity to a preset standard threshold for the collapsed area at the edge of the cavity is determined as the second impact-sensitive feature.

[0020] The sum of the first shock-sensitive feature and the second shock-sensitive feature is determined as the shock-sensitive characterization value of the soil.

[0021] Furthermore, classifying the soil within the target construction area into impact-sensitive categories includes:

[0022] If the soil shock sensitivity index is less than the preset soil shock sensitivity index, the soil is determined to be a weakly sensitive category.

[0023] If the soil shock sensitivity index is greater than or equal to the preset soil shock sensitivity index, then the soil is determined to be a highly sensitive category.

[0024] Furthermore, controlling the drilling rig's actions based on the aforementioned impact-sensitive category includes:

[0025] If the impact sensitivity category is a weakly sensitive category, the lifting speed of the drill bit and the injection intensity of the nozzle are adjusted simultaneously according to the impact sensitivity characterization value. The height of the grout level in the borehole is continuously detected. The grouting is judged based on the height to determine whether the grouting meets the predetermined standard, so as to adjust the rotation speed of the drill bit.

[0026] If the impact-sensitive category is a highly sensitive category, the drilling rig bit lifting speed and nozzle injection intensity are maintained to complete the grouting.

[0027] Furthermore, adjusting the lifting speed of the drill bit based on the aforementioned impact sensitivity characteristic value includes,

[0028] The lifting speed of the drill bit is reduced, and the amount of reduction in lifting speed is negatively correlated with the impact sensitivity index value.

[0029] Furthermore, the injection intensity of the drilling rig nozzle is adjusted based on the aforementioned impact sensitivity characterization value, wherein,

[0030] The injection intensity of the drilling rig nozzle is increased, and the increase in injection intensity is negatively correlated with the impact sensitivity characterization value.

[0031] Furthermore, determining whether the grouting meets the predetermined standards based on the stated height includes:

[0032] If the height of the grout return fluid in the borehole is less than the preset height of the grout return fluid, the grouting is deemed not to meet the predetermined standard.

[0033] If the height of the grout return fluid in the borehole is greater than or equal to the preset height of the grout return fluid, then the grouting is deemed to meet the predetermined standard.

[0034] Furthermore, if it is determined that the grouting does not meet the predetermined standards, the rotational speed of the drill bit is adjusted, wherein...

[0035] Increasing the rotation speed of the drill bit increases the amount of fluid increase, which is positively correlated with the height of the returned slurry level.

[0036] Furthermore, the bottom surface of the pre-detection pit is a plane and the area of ​​the bottom surface must be greater than a predetermined area benchmark threshold.

[0037] Furthermore, it also includes real-time recording of the drilling rig's drill bit lifting speed and the nozzle's spray intensity.

[0038] Compared with existing technologies, this invention accurately understands soil properties through impact detection and analysis of soil's impact sensitivity characteristics. This helps in better selecting construction methods and adjusting grouting parameters. Based on the soil's impact sensitivity category, construction parameters, including lifting speed and injection intensity, can be adjusted for different situations, thus achieving flexible control of the construction process. By continuously monitoring the grout level in the borehole and adjusting it according to predetermined standards, the grouting quality can be ensured to meet requirements, improving the stability and bearing capacity of the sealing wall column. Detecting soil characteristics reduces risks during construction, ensuring construction safety. Advanced impact detection and grouting technology improves construction efficiency, shortens the construction cycle, and saves costs. Grouting consolidation technology improves the bearing capacity and stability of soft soil foundations, enhancing the overall quality of the foundation while further increasing the construction efficiency of sealing walls on soft soil foundations.

[0039] In particular, this invention enables the formulation of construction plans based on the impact sensitivity categories of the soil within the target construction area. Specifically, this invention calculates impact sensitivity characterization values. In reality, soils in different areas exhibit varying impact sensitivities, with different abilities to collapse and indentation when subjected to liquid impact. Therefore, this application designs a detection scheme to measure the impact sensitivity characteristics of the soil. The impact sensitivity characterization values ​​are calculated based on the depth of the caving body and the collapse area at the caving edge, thus characterizing the soil's impact sensitivity. This provides support for the subsequent classification of impact sensitivity categories and the appropriate adoption of different high-pressure jet cement schemes, thereby improving the quality of the formed sealed wall column consolidation body.

[0040] In particular, this invention can precisely adjust the lifting speed of the drill bit and the spraying intensity of the nozzle through the impact sensitivity characterization value. For soils with weak impact sensitivity, the soil has strong impact resistance and is not easy to collapse. Therefore, the lifting speed of the drill bit is adaptively reduced, which increases the spraying duration of the nozzle on the local area to improve the soil collapse. Similarly, the spraying intensity is adaptively increased to impact the soil. In addition, the height of the grout level in the borehole is continuously monitored to detect the mixing of the grout with the collapsed soil under the action of the drill bit. Thus, the rotation speed of the drill bit is adaptively adjusted to ensure mixing efficiency, thereby improving the quality and stability of the formed sealed wall column consolidation body.

[0041] In particular, for highly sensitive soil types, which are prone to collapse under impact, high-pressure jet cement technology can be easily applied. Therefore, maintaining the drilling speed of the drill bit and the jet intensity of the nozzle is crucial to complete the grouting process, forming a sealed wall column solidification, thereby improving construction efficiency. Attached Figure Description

[0042] Figure 1This is a schematic diagram illustrating the construction steps of a sealing wall based on soft soil foundation according to an embodiment of the present invention;

[0043] Figure 2 This is a flowchart illustrating the steps involved in detecting the collapsed area at the edge of a cave in accordance with an embodiment of the present invention.

[0044] Figure 3 A logic decision diagram for classifying the impact-sensitive categories of soil within the target construction area according to an embodiment of the present invention;

[0045] Figure 4 This is a logic decision diagram for controlling the drilling rig's actions based on the impact-sensitive category in an embodiment of the present invention. Detailed Implementation

[0046] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0047] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0048] Please see Figure 1 The diagram illustrates the construction steps of a sealing wall based on soft soil foundation according to an embodiment of the present invention. The present invention provides a method for constructing a sealing wall on a soft soil foundation, comprising:

[0049] Step S1: Mark several detection points in the target construction area, conduct jet impact testing on the detection points, and determine the soil's impact sensitivity characteristics. This includes excavating a pre-detection pit at a predetermined depth at the detection point, impacting the bottom of the pre-detection pit with a predetermined water flow intensity, and detecting the depth of the pit obtained by the impact and the collapse area of ​​the pit's edge.

[0050] Step S2: Determine the impact sensitivity characterization value of the soil in the target construction area based on the soil impact sensitivity characteristics, so as to classify the impact sensitivity category of the soil in the target construction area.

[0051] Step S3: Using a drilling rig, a grouting pipe with a nozzle is drilled into a predetermined location in the soil within the target construction area. The drilling rig's operation is controlled based on the impact sensitivity category to grout the soil, forming a sealed wall-column consolidation body, including...

[0052] Based on the impact sensitivity index, the lifting speed of the drill bit and the injection intensity of the nozzle are adjusted simultaneously. The height of the grout level in the borehole is continuously monitored. Based on the height, it is determined whether the grouting meets the predetermined standard, so as to adjust the rotation speed of the drill bit.

[0053] Alternatively, grouting can be completed by maintaining the drilling speed of the drill bit and the spray intensity of the nozzle.

[0054] Specifically, there is no limitation on the depth of the cavity obtained from the impact detection; it can be a laser rangefinder or other methods, which will not be elaborated here.

[0055] Specifically, there is no limit to the predetermined depth of the pre-test pit to be excavated at the test point. It is understood that in order to obtain the internal condition of the soil, the excavation depth should not be too shallow. Preferably, the excavation depth should be greater than 1 meter. The shape of the pit can be a cube and the bottom should be flat. This will not be elaborated further.

[0056] Specifically, the predetermined water flow intensity for impacting the bottom of the pre-test pit is not limited and can be between 1 and 2 kgf / cm². 2 This will not be elaborated further.

[0057] Specifically, by excavating a pre-test pit at the test point and impacting it with a predetermined water flow intensity, the impact conditions encountered by the soil during actual construction can be accurately simulated. This accurately reflects the soil's sensitivity to impact, resulting in collapse or breakage. The depth of the pit and the collapse area at the edge of the pit obtained from the impact test can accurately determine the soil's impact sensitivity characteristics, thereby improving the accuracy of construction. If the pit is deep and the collapse area is large, it indicates that the soil is highly sensitive to impact.

[0058] Please see Figure 2 The diagram shown is a flowchart illustrating the steps of detecting the collapsed area at the edge of a cave in an embodiment of the invention. In step S1, the process of detecting the collapsed area at the edge of the cave includes...

[0059] Step S11: Impact the bottom of the pre-detection pit with a predetermined water flow intensity for a predetermined duration;

[0060] Step S12: Take an image of the area where the hole was formed by the impact;

[0061] Step S13: Mark the concave contour in the image, determine the area of ​​the concave contour, and obtain the collapsed area of ​​the hole edge.

[0062] In practice, the preset duration can be set between 3 and 5 minutes, which will not be elaborated further.

[0063] In practice, the images of the impact-induced hole area are captured using a camera device. There are no restrictions on the specific method for identifying the concave contours in the acquired images. Contour recognition algorithms can be used to process the images, or other methods can be used, which will not be elaborated here.

[0064] Specifically, in step S2, determining the impact sensitivity characterization value of the soil within the target construction area based on the soil impact sensitivity characteristics includes:

[0065] The ratio of the cavity depth to a preset standard threshold for cavity depth is determined as the first impact-sensitive feature;

[0066] The ratio of the collapsed area at the edge of the cavity to a preset standard threshold for the collapsed area at the edge of the cavity is determined as the second impact-sensitive feature.

[0067] The sum of the first shock-sensitive feature and the second shock-sensitive feature is determined as the shock-sensitive characterization value of the soil.

[0068] The standard thresholds for tunnel depth and tunnel edge collapse area are pre-set. Specifically, several target construction areas are pre-tested at detection points to determine the soil's impact sensitivity characteristics, resulting in several tunnel depths and tunnel edge collapse areas. The average tunnel depth and average tunnel edge collapse area are calculated. The standard threshold for tunnel depth is set to be 1.1 times the average tunnel depth, and the standard threshold for tunnel edge collapse area is set to be 1.1 times the average tunnel edge collapse area.

[0069] Please see Figure 3 As shown, this is a logic decision diagram for classifying the soil in the target construction area into impact-sensitive categories according to an embodiment of the present invention. In step S2, classifying the soil in the target construction area into impact-sensitive categories includes...

[0070] If the soil shock sensitivity index is less than the preset soil shock sensitivity index, the soil is determined to be a weakly sensitive category.

[0071] If the soil shock sensitivity index is greater than or equal to the preset soil shock sensitivity index, then the soil is determined to be a highly sensitive category.

[0072] Specifically, the preset soil shock sensitivity characterization values ​​are selected within the range [2.25, 2.45].

[0073] Please see Figure 4 As shown, this is a logic decision diagram for controlling the drilling rig's actions based on the impact-sensitive category in an embodiment of the present invention. In step S3, controlling the drilling rig's actions based on the impact-sensitive category includes:

[0074] If the impact sensitivity category is a weakly sensitive category, the lifting speed of the drill bit and the injection intensity of the nozzle are adjusted simultaneously according to the impact sensitivity characterization value. The height of the grout level in the borehole is continuously detected. The grouting is judged based on the height to determine whether the grouting meets the predetermined standard, so as to adjust the rotation speed of the drill bit.

[0075] If the impact-sensitive category is a highly sensitive category, the drilling rig bit lifting speed and nozzle injection intensity are maintained to complete the grouting.

[0076] Specifically, in step S3, adjusting the lifting speed of the drill bit based on the impact sensitivity characterization value includes:

[0077] The lifting speed of the drill bit is reduced, and the amount of reduction in lifting speed is negatively correlated with the impact sensitivity index value.

[0078] In implementation, optionally,

[0079] The values ​​of soil sensitive to shock were compared with the first and second values ​​of soil sensitive to shock.

[0080] If the soil shock sensitivity index is less than or equal to the first soil shock sensitivity index, then the reduction in lifting speed is determined to be 0.3 times the initial drill bit speed;

[0081] If the soil impact sensitivity index is greater than the first soil impact sensitivity index but less than the second soil impact sensitivity index, then the reduction in lifting speed is determined to be 0.2 times the initial drill bit speed.

[0082] If the soil shock sensitivity index is greater than or equal to the second soil shock sensitivity index, then the reduction in lifting speed is determined to be 0.1 times the initial drill bit speed;

[0083] The first soil shock sensitivity index is 0.6 times the soil shock sensitivity index, and the second soil shock sensitivity index is 0.8 times the soil shock sensitivity index.

[0084] Specifically, the injection intensity of the drilling rig nozzle is adjusted based on the aforementioned impact sensitivity characterization value, wherein,

[0085] The injection intensity of the drilling rig nozzle is increased, and the increase in injection intensity is negatively correlated with the impact sensitivity characterization value.

[0086] In implementation, optionally,

[0087] The soil shock sensitivity index was compared with the first soil shock sensitivity index and the second soil shock sensitivity index.

[0088] If the soil shock sensitivity index is less than or equal to the first soil shock sensitivity index, then the increase in spray intensity is determined to be 0.2 times the initial spray intensity.

[0089] If the soil impact sensitivity index is greater than the first soil impact sensitivity index but less than the second soil impact sensitivity index, then the increase in spray intensity is determined to be 0.15 times the initial spray intensity.

[0090] If the soil shock sensitivity index is greater than or equal to the second soil shock sensitivity index, then the increase in spray intensity is determined to be 0.1 times the initial spray intensity.

[0091] This invention enables precise adjustment of the drill bit's lifting speed and the nozzle's spray intensity based on impact sensitivity values. For soils with low impact sensitivity and strong resistance to impact, the drill bit's lifting speed is adaptively reduced, increasing the nozzle's spray duration in localized areas to mitigate soil collapse. Similarly, the spray intensity is adaptively increased to impact the soil. Furthermore, the height of the grout level within the borehole is continuously monitored to detect the mixing of the grout with the collapsing soil under the influence of the drill bit. This allows for adaptive adjustment of the drill bit's rotation speed to ensure mixing efficiency, thereby improving the quality and stability of the formed sealed wall column consolidation.

[0092] Specifically, in step S3, determining whether the grouting meets the predetermined standard based on the height includes:

[0093] If the height of the grout return fluid in the borehole is less than the preset height of the grout return fluid, the grouting is deemed not to meet the predetermined standard.

[0094] If the height of the grout return fluid in the borehole is greater than or equal to the preset height of the grout return fluid, then the grouting is deemed to meet the predetermined standard.

[0095] The preset grout level is obtained by measuring the grout level during several construction processes, calculating the average grout level, and setting the preset grout level to 0.85 times the average grout level.

[0096] Specifically, in step S3, if it is determined that the grouting does not meet the predetermined standard, the rotation speed of the drill bit is adjusted.

[0097] Specifically, the rotational speed of the drill bit is adjusted, wherein...

[0098] The rotational speed of the drill bit is positively correlated with the height of the slurry level in the borehole.

[0099] In implementation, optionally,

[0100] The height of the returned grout level is compared with the preset first and second returned grout level heights.

[0101] If the height of the returned slurry is less than or equal to the height of the first returned slurry, then the increase in the rotational speed of the drill bit is determined to be 0.1 times the initial rotational speed.

[0102] If the height of the returned slurry is greater than the height of the first returned slurry but less than the height of the second returned slurry, then the increase in the rotational speed of the drill bit is determined to be 0.15 times the initial rotational speed.

[0103] If the height of the returned slurry is greater than or equal to the height of the second returned slurry, then the increase in the rotational speed of the drill bit is determined to be 0.2 times the initial rotational speed.

[0104] The preset height of the first return slurry level is 1.25 times the preset height of the return slurry level;

[0105] The preset height of the second return slurry level is 1.5 times the preset height of the return slurry level;

[0106] Specifically, the bottom surface of the pre-detection pit is a plane and the area of ​​the bottom surface must be greater than a predetermined area benchmark threshold.

[0107] In practice, the predetermined area benchmark threshold is selected between 0.5 square meters and 1 square meter.

[0108] For highly sensitive soil types, which are prone to collapse under impact, high-pressure jet cementing is convenient. Therefore, maintaining the drilling speed of the drill bit and the spraying intensity of the nozzle is crucial to complete the grouting process, forming a sealed wall column consolidation body, thereby improving construction efficiency.

[0109] Specifically, this also includes real-time recording of the drilling rig's drill bit lifting speed and the nozzle's spray intensity.

[0110] During implementation, real-time recording of the drilling rig's drill bit lifting speed and the nozzle's spray intensity allows operators to view accurate construction parameters, thereby gaining a more precise understanding of the construction status.

[0111] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for constructing a sealing wall for soft soil foundations, characterized in that, include: Step S1: Mark several detection points in the target construction area, conduct jet impact testing on the detection points, and determine the soil's impact sensitivity characteristics. This includes excavating a pre-detection pit at a predetermined depth at the detection point, impacting the bottom of the pre-detection pit with a predetermined water flow intensity, and detecting the depth of the pit obtained by the impact and the collapse area of ​​the pit's edge. The process of detecting the area of ​​collapse at the edge of the cave includes, The bottom of the pre-detection pit is impacted with a predetermined water flow intensity for a predetermined duration; Images were taken of the area where the hole was created by the impact. The concave contour in the image is calibrated, the area of ​​the concave contour is determined, and the collapsed area of ​​the hole edge is obtained; Step S2: Determine the impact sensitivity characterization value of the soil in the target construction area based on the soil impact sensitivity characteristics, so as to classify the impact sensitivity category of the soil in the target construction area. The ratio of the cavity depth to a preset standard threshold for cavity depth is determined as the first impact-sensitive feature; The ratio of the collapsed area at the edge of the cavity to a preset standard threshold for the collapsed area at the edge of the cavity is determined as the second impact-sensitive feature. The sum of the first shock-sensitive feature and the second shock-sensitive feature is determined as the shock-sensitive characterization value of the soil; If the soil shock sensitivity index is less than the preset soil shock sensitivity index, the soil is determined to be a weakly sensitive category. If the soil shock sensitivity index is greater than or equal to the preset soil shock sensitivity index, then the soil is determined to be a highly sensitive category. Step S3: Using a drilling rig, insert a grouting pipe with a nozzle into a predetermined location in the soil within the target construction area. Control the drilling rig's movement based on the impact sensitivity category to grout the soil, forming a sealed wall column consolidation body. If the impact sensitivity category is a weakly sensitive category, the lifting speed of the drill bit and the injection intensity of the nozzle are adjusted simultaneously according to the impact sensitivity characterization value. The height of the grout level in the borehole is continuously detected. The grouting is judged based on the height to determine whether the grouting meets the predetermined standard, so as to adjust the rotation speed of the drill bit. If the impact-sensitive category is a highly sensitive category, then the drilling rig bit lifting speed and the nozzle injection intensity are maintained to complete the grouting.

2. The method for constructing a sealing wall for soft soil foundation according to claim 1, characterized in that, Adjusting the lifting speed of the drill bit based on the aforementioned impact sensitivity index includes: The lifting speed of the drill bit is reduced, and the amount of reduction in lifting speed is negatively correlated with the impact sensitivity index.

3. The method for constructing a sealing wall for soft soil foundation according to claim 1, characterized in that, The injection intensity of the drilling rig nozzle is adjusted according to the aforementioned impact sensitivity characterization value, wherein, The injection intensity of the drilling rig nozzle is increased, and the increase in injection intensity is negatively correlated with the impact sensitivity characterization value.

4. The method for constructing a sealing wall for soft soil foundation according to claim 1, characterized in that, Determining whether the grouting meets the predetermined standards based on the height includes: If the height of the grout return fluid in the borehole is less than the preset height of the grout return fluid, the grouting is deemed not to meet the predetermined standard. If the height of the grout return fluid in the borehole is greater than or equal to the preset height of the grout return fluid, then the grouting is deemed to meet the predetermined standard.

5. The method for constructing a sealing wall for soft soil foundation according to claim 4, characterized in that, If the grouting is determined to be non-compliant with predetermined standards, the rotational speed of the drill bit is adjusted. Increasing the rotation speed of the drill bit increases the amount of fluid increase, which is positively correlated with the height of the returned slurry level.

6. The method for constructing a sealing wall for soft soil foundation according to claim 1, characterized in that, The bottom surface of the pre-detection pit is flat and the area of ​​the bottom surface must be greater than the predetermined area benchmark threshold.

7. The method for constructing a sealing wall for soft soil foundation according to claim 1, characterized in that, It also includes real-time recording of the drilling rig's drill bit lifting speed and the nozzle's spray intensity.

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