Sealing wall construction method for soft soil foundation

Abstract

The invention relates to the field of soft soil foundation construction, in particular to a sealing wall construction method for a soft soil foundation, which comprises the following steps of: calibrating a plurality of detection points in a target construction area, carrying out jet impact detection on the detection points, and determining soil impact sensitive characteristics; according to the soil impact sensitive characteristics, determining an impact sensitive characterization value of soil in a target construction area so as to divide impact sensitive categories of the soil in the target construction area; drilling a grouting pipe with a nozzle into a preset position of soil in the target construction area by using a drilling machine, controlling the drilling machine to act based on the impact sensitive type, grouting the soil and forming a sealing wall column consolidation body, and if the impact sensitive type is weak sensitive, simultaneously adjusting the lifting speed of a drill bit of the drilling machine and the spraying strength of the nozzle to form the sealing wall column consolidation body. The problem that the construction process is affected due to different impact sensitivities of soil is solved, and then the construction quality and efficiency of sealing wall construction of the soft soil foundation are improved.

Description

Technical Field

[0001] The present invention relates to the field of soft soil foundation construction, and particularly to a construction method for a sealing wall for soft soil foundation. Background Art

[0002] Soft soil foundations usually have the characteristics of high compressibility, low strength, and high water content, which bring many challenges to engineering construction. The sealing wall of soft soil foundation is a construction technology specifically designed for the characteristics of soft soil foundation. In order to improve the bearing capacity and stability of soft soil foundation, various construction methods can be adopted, among which the sealing wall construction method has received attention due to its effectiveness and environmental friendliness.

[0003] Chinese Patent Publication No.: CN114753347A, discloses a grid-type soft soil foundation treatment method and foundation structure, including a grid-type solidification wall and a hard shell layer fixedly installed on the grid-type solidification wall. A plurality of wall columns are fixedly installed on the grid-type solidification wall, and the plurality of wall columns are symmetrically arranged. Each wall column is provided with an installation cavity, and a plurality of feeding holes communicating with the installation cavity are provided on the grid-type solidification wall. A plurality of water outlet holes are arranged at equal intervals on the wall column; a plurality of through holes respectively communicating with the corresponding installation cavities are provided on the hard shell layer, and a plurality of sealing components are arranged on the hard shell layer.

[0004] However, the following problems still exist in the prior art:

[0005] The impact sensitivity of soils in different regions is different, which affects the punching, disturbance, and damage of soil bodies in the high-pressure jet cement process, affects the grouting process, and the quality of the formed sealing wall column consolidation body. Summary of the Invention

[0006] Therefore, the present invention provides a construction method for a sealing wall for soft soil foundation to overcome the problem in the prior art that the impact sensitivity of soils in different regions is different, which affects the punching, disturbance, and damage of soil bodies in the high-pressure jet cement process, affects the grouting process, and the quality of the formed sealing wall column consolidation body.

[0007] To achieve the above object, the present invention provides a construction method for a sealing wall for soft soil foundation, including:

[0008] Calibrate a number of detection points in the target construction area, conduct jet impact detection on the detection points to determine the impact-sensitive characteristics of the soil, including excavating a pre-detection pit with 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 resulting hole and the collapse area of the hole edge;

[0009] Determine the impact-sensitive characterization value of the soil in the target construction area based on the impact-sensitive characteristics of the soil, so as to divide the impact-sensitive categories of the soil in the target construction area;

[0010] Use a drill rig to drill a grouting pipe with a nozzle into a predetermined position of the soil in the target construction area, control the operation of the drill rig based on the impact-sensitive category, and grout the soil to form a sealed wall column solidified body, including,

[0011] Simultaneously adjust the lifting speed of the drill bit and the spraying intensity of the nozzle according to the impact-sensitive characterization value, continuously detect the height of the return slurry liquid level in the drill hole, and determine whether the grouting meets the predetermined standard based on the height, so as to adjust the rotation speed of the drill bit;

[0012] Or, maintain the lifting speed of the drill bit and the spraying intensity of the nozzle to complete the grouting.

[0013] Further, the process of detecting the collapse area of the hole body edge includes,

[0014] Impact the bottom of the pre-detection pit body with a predetermined water flow intensity for a predetermined duration;

[0015] Take an image of the hole area formed by the impact;

[0016] Calibrate the depression contour in the image, determine the area of the depression contour, and obtain the collapse area of the hole body edge.

[0017] Further, determining the impact-sensitive characterization value of the soil in the target construction area based on the impact-sensitive characteristics of the soil includes,

[0018] Determine the ratio of the hole depth to the preset hole depth standard threshold as the first impact-sensitive characteristic;

[0019] Determine the ratio of the collapse area of the hole body edge to the preset collapse area standard threshold of the hole body edge as the second impact-sensitive characteristic;

[0020] Determine the sum of the first impact-sensitive characteristic and the second impact-sensitive characteristic as the impact-sensitive characterization value of the soil.

[0021] Further, dividing the impact-sensitive categories of the soil in the target construction area includes,

[0022] If the impact-sensitive characterization value of the soil is less than the preset impact-sensitive characterization value of the soil, then determine that the impact-sensitive category of the soil is a weak-sensitive category;

[0023] If the impact-sensitive characterization value of the soil is greater than or equal to the preset impact-sensitive characterization value of the soil, then determine that the impact-sensitive category of the soil is a strong-sensitive category.

[0024] Further, controlling the drilling rig operation based on the impact-sensitive category includes

[0025] If the impact-sensitive category is a weak-sensitive category, then simultaneously adjust the lifting speed of the drill bit of the drilling rig and the injection intensity of the nozzle according to the impact-sensitive characterization value, continuously detect the height of the returned slurry liquid level in the borehole, and determine whether the grouting meets the predetermined standard based on the height to adjust the rotation speed of the drill bit of the drilling rig;

[0026] If the impact-sensitive category is a strong-sensitive category, then maintain the lifting speed of the drill bit of the drilling rig and the injection intensity of the nozzle to complete the grouting.

[0027] Further, adjusting the lifting speed of the drill bit of the drilling rig according to the impact-sensitive characterization value includes

[0028] Reduce the lifting speed of the drill bit of the drilling rig, and the reduction amount of the lifting speed is negatively correlated with the impact-sensitive characterization value.

[0029] Further, adjusting the injection intensity of the nozzle of the drilling rig according to the impact-sensitive characterization value, wherein

[0030] Increase the injection intensity of the nozzle of the drilling rig, and the increase amount of the injection intensity is negatively correlated with the impact-sensitive characterization value.

[0031] Further, determining whether the grouting meets the predetermined standard based on the height includes

[0032] If the height of the returned slurry liquid level in the borehole is less than the preset height of the returned slurry liquid level, then determine that the grouting does not meet the predetermined standard;

[0033] If the height of the returned slurry liquid level in the borehole is greater than or equal to the preset height of the returned slurry liquid level, then determine that the grouting meets the predetermined standard.

[0034] Further, if it is determined that the grouting does not meet the predetermined standard, then adjust the rotation speed of the drill bit of the drilling rig, wherein

[0035] Increase the rotation speed of the drill bit of the drilling rig, and the increase amount is positively correlated with the height of the returned slurry liquid level.

[0036] Further, the bottom surface of the pre-detection pit is a plane and the bottom surface area needs to be greater than the predetermined area reference threshold.

[0037] Further, it also includes recording the lifting speed of the drill bit of the drilling rig and the injection intensity of the nozzle in real time.

[0038] Compared with the prior art, the present invention can accurately understand the properties of soil by impact detection and analysis of the impact-sensitive characteristics of the soil, which helps to better select construction methods and adjust grouting parameters. According to the impact-sensitive categories of the soil, construction parameters can be adjusted for different situations, including the lifting speed and spraying intensity, so as to achieve flexible control of the construction process. By continuously detecting the height of the return slurry liquid level in the borehole and adjusting it according to a predetermined standard, the grouting quality can be ensured to meet the requirements, and the stability and bearing capacity of the sealed wall column can be improved. By detecting the soil characteristics, the risks during the construction process can be reduced, and the construction safety can be ensured. Through advanced impact detection and grouting technologies, the construction efficiency can be improved, the construction period can be shortened, and the cost can be saved. Through the grouting consolidation technology, the bearing capacity and stability of the soft soil foundation can be improved, and while improving the overall quality of the foundation, the construction efficiency of the sealed wall of the soft soil foundation can be further improved.

[0039] In particular, the present invention can formulate a construction plan according to the impact-sensitive categories of the soil by dividing the impact-sensitive categories of the soil in the target construction area. Among them, the present invention calculates the impact-sensitive characterization value. In actual situations, the impact sensitivity of the soil in different regions is different. When subjected to liquid impact, the slump and the ability to be impacted and dented are different. Therefore, this application designs a detection plan for measuring the impact-sensitive characteristics of the soil, and calculates the impact-sensitive characterization value based on the depth of the hole and the slump area of the hole edge to characterize the impact sensitivity of the soil. Furthermore, it provides support for adaptively adopting different high-pressure jet cement schemes for subsequent division of impact-sensitive categories, and improves the quality of the formed consolidated body of the sealed wall column.

[0040] In particular, the present invention can accurately adjust the lifting speed of the drill bit of the drilling rig and the spraying intensity of the nozzle through the impact-sensitive characterization value. For soils with weak sensitivity categories, the impact resistance is strong and the soil mass is not easily slumped. Therefore, the lifting speed of the drill bit of the drilling rig is adaptively reduced, so that the spraying duration of the nozzle on a local area is increased to improve the slumping of the soil mass. Similarly, the spraying intensity is adaptively enhanced to impact the soil mass, and the height of the return slurry liquid level in the borehole is continuously detected to detect the mixing situation of the slurry driven by the drill bit and the slumped soil mass during the process. Furthermore, the rotation speed of the drill bit of the drilling rig is adaptively adjusted to ensure the mixing efficiency, and thus the quality and stability of the formed consolidated body of the sealed wall column are improved.

[0041] In particular, for soils with strong sensitivity categories, due to the easy slumping under impact, it is convenient to carry out the high-pressure jet cement process. Therefore, the lifting speed of the drill bit of the drilling rig and the spraying intensity of the nozzle are maintained to complete the grouting and form a consolidated body of the sealed wall column, thereby improving the construction efficiency. Description of the Drawings

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

[0043] Figure 2 Flowchart of the steps of the process for detecting the collapse area of the hole body edge according to an embodiment of the present invention;

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

[0045] Figure 4 Logical decision diagram for controlling the operation of the drilling rig based on the impact-sensitive categories according to an embodiment of the present invention. Detailed implementation manners

[0046] In order to make the objectives and advantages of the present invention clearer and more understandable, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0048] Please refer to Figure 1 as shown, which is a schematic diagram of the construction steps of a sealing wall based on a soft soil foundation according to an embodiment of the present invention. The present invention provides a method for constructing a sealing wall for a soft soil foundation, including:

[0049] Step S1: Calibrate a number of detection points in the target construction area, perform jet impact detection on the detection points to determine the impact-sensitive characteristics of the soil, including excavating a pre-detection pit with 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 hole body and the collapse area of the hole body edge obtained by the impact;

[0050] Step S2: Determine the impact-sensitive characterization value of the soil within the target construction area based on the impact-sensitive characteristics of the soil, so as to classify the impact-sensitive categories of the soil within the target construction area;

[0051] Step S3: Use a drilling rig to drill a grouting pipe with a nozzle into a predetermined position of the soil within the target construction area, control the operation of the drilling rig based on the impact-sensitive categories, and grout the soil to form a sealing wall column consolidation body, including,

[0052] Simultaneously adjust the lifting speed of the drilling rig bit and the jet intensity of the nozzle according to the impact-sensitive characterization value, continuously detect the height of the return slurry liquid level in the drill hole, and determine whether the grouting meets the predetermined standard based on the height, so as to adjust the rotation speed of the drilling rig bit;

[0053] Or, maintain the lifting speed of the drill bit and the jet intensity of the nozzle to complete the grouting.

[0054] Specifically, there is no limitation on the hole depth obtained by impact detection, and it can be a laser rangefinder or other forms, which will not be elaborated here.

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

[0056] Specifically, there is no limit on the predetermined water flow intensity for impacting the bottom of the pre-detection pit body with a predetermined water flow intensity, and it can be 1 to 2 kgf / cm2. 2 ), which will not be elaborated here.

[0057] Specifically, by digging a pre-test pit at the test point and impacting it with a predetermined water flow intensity, the impact situation encountered by the soil during the actual construction process can be accurately simulated, and the sensitivity of the soil to collapse or breakage due to impact can be accurately reflected. The depth of the hole obtained by testing the impact and the collapse area at the edge of the hole can accurately determine the sensitive characteristics of the soil to impact, thereby improving the accuracy of the construction. If the hole depth is deep and the collapse area is large, it means that the soil is more sensitive to impact.

[0058] See also Figure 2 As shown, it is a flowchart of the process of detecting the collapse area of ​​the cave edge according to an embodiment of the present invention. In step S1, the process of detecting the collapse area of ​​the cave edge includes:

[0059] Step S11, impacting the bottom of the pre-detected pit with a predetermined water flow intensity for a predetermined time;

[0060] Step S12, photographing an image of the hole area formed by the impact;

[0061] Step S13, calibrate the concave contour in the image, determine the area of ​​the concave contour, and obtain the collapse area of ​​the cave edge.

[0062] In implementation, the preset duration can be set between 3 and 5 minutes, which will not be repeated here.

[0063] In implementation, the method of capturing the image of the hole area formed by the impact is to use a camera device. There is no limitation on the specific method of identifying the concave contour in the captured image. The image can be processed by a contour recognition algorithm. Of course, other methods can also be used, which will not be repeated here.

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

[0065] Determining the ratio of the hole depth to the preset standard threshold of the hole depth as the first impact-sensitive characteristic;

[0066] Determining the ratio of the collapse area of the hole edge to the preset standard threshold of the collapse area of the hole edge as the second impact-sensitive characteristic;

[0067] Determining the sum of the first impact-sensitive characteristic and the second impact-sensitive characteristic as the impact-sensitive characterization value of the soil.

[0068] The standard threshold of the hole depth and the standard threshold of the collapse area of the hole edge are preset. Among them, a number of detection points in several target construction areas are detected in advance to determine the impact-sensitive characteristics of the soil, obtaining a number of hole depths and collapse areas of the hole edge, solving the average value of the hole depth and the average value of the collapse area of the hole edge, and setting that the standard threshold of the hole depth is 1.1 times the average value of the hole depth, and the standard threshold of the collapse area of the hole edge is 1.1 times the average value of the collapse area of the hole edge.

[0069] Please refer to Figure 3 As shown, it is the logical decision diagram for classifying the impact-sensitive categories of the soil in the target construction area in the embodiment of the present invention. In step S2, classifying the impact-sensitive categories of the soil in the target construction area includes,

[0070] If the impact-sensitive characterization value of the soil is less than the preset impact-sensitive characterization value of the soil, it is determined that the impact-sensitive category of the soil is a weak-sensitive category;

[0071] If the impact-sensitive characterization value of the soil is greater than or equal to the preset impact-sensitive characterization value of the soil, it is determined that the impact-sensitive category of the soil is a strong-sensitive category.

[0072] Specifically, the preset impact-sensitive characterization value of the soil is selected within the interval [2.25, 2.45].

[0073] Please refer to Figure 4 As shown, it is the logical decision diagram for controlling the operation of the drill based on the impact-sensitive category in the embodiment of the present invention. In step S3, controlling the operation of the drill based on the impact-sensitive category includes,

[0074] If the impact-sensitive category is a weak-sensitive category, adjust the lifting speed of the drill bit and the injection intensity of the nozzle simultaneously according to the impact-sensitive characterization value, continuously detect the height of the return slurry liquid level in the drill hole, and determine whether the grouting meets the predetermined standard according to the height to adjust the rotation speed of the drill bit;

[0075] If the impact-sensitive category is a strong-sensitive category, maintain the lifting speed of the drill bit of the rig and the injection intensity of the nozzle to complete grouting.

[0076] Specifically, in step S3, adjusting the lifting speed of the drill bit of the rig according to the impact-sensitive characterization value includes,

[0077] Reduce the lifting speed of the drill bit of the rig, and the reduction amount of the lifting speed is negatively correlated with the impact-sensitive characterization value.

[0078] In implementation, optionally,

[0079] Compare the impact-sensitive characterization value with the first soil impact-sensitive characterization value and the second soil impact-sensitive characterization value.

[0080] If the soil impact-sensitive characterization value is less than or equal to the first soil impact-sensitive characterization value, determine that the reduction amount of the lifting speed is 0.3 times the initial bit speed;

[0081] If the soil impact-sensitive characterization value is greater than the first soil impact-sensitive characterization value and less than the second soil impact-sensitive characterization value, determine that the reduction amount of the lifting speed is 0.2 times the initial bit speed;

[0082] If the soil impact-sensitive characterization value is greater than or equal to the second soil impact-sensitive characterization value, determine that the reduction amount of the lifting speed is 0.1 times the initial bit speed;

[0083] The first soil impact-sensitive characterization value is 0.6 times the soil impact-sensitive characterization value, and the second soil impact-sensitive characterization value is 0.8 times the soil impact-sensitive characterization value.

[0084] Specifically, adjust the injection intensity of the nozzle of the rig according to the impact-sensitive characterization value, where,

[0085] Increase the injection intensity of the nozzle of the rig, and the increase amount of the injection intensity is negatively correlated with the impact-sensitive characterization value.

[0086] In implementation, optionally,

[0087] Compare the soil impact-sensitive characterization value with the first soil impact-sensitive characterization value and the second soil impact-sensitive characterization value.

[0088] If the soil impact-sensitive characterization value is less than or equal to the first soil impact-sensitive characterization value, determine that the increase amount of the injection intensity is 0.2 times the initial injection intensity;

[0089] If the impact sensitivity characterization value of the soil is greater than the first soil impact sensitivity characterization value and less than the second soil impact sensitivity characterization value, then determine that the increase in injection intensity is 0.15 times the initial injection intensity;

[0090] If the impact sensitivity characterization value of the soil is greater than or equal to the second soil impact sensitivity characterization value, then determine that the increase in injection intensity is 0.1 times the initial injection intensity;

[0091] The present invention can accurately adjust the lifting speed of the drill bit of the drilling rig and the injection intensity of the nozzle through the impact sensitivity characterization value. For soils of the weakly sensitive category, the impact resistance is relatively strong, and the soil mass is not prone to collapse. Therefore, adaptively reduce the lifting speed of the drill bit of the drilling rig, so that the injection duration of the nozzle for a local area increases to improve the situation of soil mass collapse. Similarly, adaptively increase the injection intensity to impact the soil mass. And continuously detect the height of the returned slurry liquid level in the borehole to detect the mixing situation of the slurry driven by the drill bit and the collapsed soil mass during the detection process. Then, adaptively adjust the rotation speed of the drill bit of the drilling rig to ensure the mixing efficiency, and further improve the quality and stability of the formed sealed wall column solidified body.

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

[0093] If the height of the returned slurry liquid level in the borehole is less than the preset returned slurry liquid level height, then determine that the grouting does not meet the predetermined standard;

[0094] If the height of the returned slurry liquid level in the borehole is greater than or equal to the preset returned slurry liquid level height, then determine that the grouting meets the predetermined standard.

[0095] The preset returned slurry liquid level height is obtained by pre - setting. Measure the height of the returned slurry liquid level during several construction processes, solve the average value of the returned slurry liquid level height, and set the preset returned slurry liquid level height to 0.85 times the average value of the returned slurry liquid level height.

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

[0097] Specifically, adjust the rotation speed of the drill bit of the drilling rig, where,

[0098] The rotation speed of the drill bit of the drilling rig is positively correlated with the height of the returned slurry liquid level in the borehole.

[0099] In implementation, optionally,

[0100] Compare the height of the returned slurry liquid level with the preset first returned slurry liquid level height and the preset second returned slurry liquid level height,

[0101] If the height of the return slurry liquid level is less than or equal to the first return slurry liquid level height, it is determined that the increase in the rotational speed of the drill bit of the drilling rig is 0.1 times the initial rotational speed;

[0102] If the height of the return slurry liquid level is greater than the first return slurry liquid level height and less than the second return slurry liquid level height, it is determined that the increase in the rotational speed of the drill bit of the drilling rig is 0.15 times the initial rotational speed;

[0103] If the height of the return slurry liquid level is greater than or equal to the second return slurry liquid level height, it is determined that the increase in the rotational speed of the drill bit of the drilling rig is 0.2 times the initial rotational speed;

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

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

[0106] Specifically, the bottom surface of the pre-detection pit body is a plane and the bottom surface area needs to be greater than the predetermined area reference threshold.

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

[0108] For soils of the strong-sensitive category, because they are prone to collapse under impact and are convenient for the high-pressure jet cement process, therefore, the lifting speed of the drill bit of the drilling rig and the jetting intensity of the nozzle are maintained to complete grouting, forming a sealed wall column consolidation body, thereby improving the construction efficiency.

[0109] Specifically, it also includes real-time recording of the lifting speed of the drill bit of the drilling rig and the jetting intensity of the nozzle.

[0110] In implementation, real-time recording of the lifting speed of the drill bit of the drilling rig and the jetting intensity of the nozzle facilitates the operator to view accurate construction parameters, so as to more accurately master the construction status.

[0111] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 protection scope of the present invention.

Claims

1. A sealing wall construction method for soft soil foundation, characterized in that: include: Mark several detection points in the target construction area, perform jet impact detection on the detection points, and determine the impact-sensitive characteristics of the soil, including digging a predetermined depth at the detection point to construct a pre-detection pit, impacting the bottom of the pre-detection pit with a predetermined water flow intensity, and detecting the depth of the hole obtained by the impact and the collapse area of ​​the edge of the hole; The process of detecting the collapse area 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 time; Take images of the hole area created by the impact; Calibrate the concave contour in the image, determine the area of ​​the concave contour, and obtain the collapse area of ​​the edge of the cave body; Determining a shock sensitivity characterization value of the soil in the target construction area according to the shock sensitivity characteristics of the soil, so as to classify the shock sensitivity category of the soil in the target construction area; Using a drilling machine to drill a grouting pipe with a nozzle into a predetermined position of the soil in the target construction area, controlling the action of the drilling machine based on the impact sensitive category, grouting the soil to form a sealed wall column consolidation body, including: According to the impact sensitive characterization value, the lifting speed of the drill bit and the spray intensity of the nozzle are adjusted simultaneously, the liquid level of the grouting liquid in the borehole is continuously detected, and the grouting is determined according to the height to determine whether the grouting meets the predetermined standard, so as to adjust the rotation speed of the drill bit; Or, maintain the lifting speed of the drill bit and the jet intensity of the nozzle to complete the grouting.

2. The sealing wall construction method for soft soil foundation according to claim 1, characterized in that: Determining the shock sensitivity characterization value of the soil in the target construction area based on the shock sensitivity characteristics of the soil includes: Determining the ratio of the hole depth to a preset hole depth standard threshold as a first impact-sensitive feature; Determine the ratio of the cave edge collapse area to a preset cave edge collapse area standard threshold as the second impact sensitive feature; The sum of the first shock-sensitive characteristic and the second shock-sensitive characteristic is determined as the shock-sensitive characterization value of the soil.

3. The sealing wall construction method for soft soil foundation according to claim 1, characterized in that: The impact-sensitive categories of the soil in the target construction area include: If the soil impact sensitivity characterization value is less than a preset soil impact sensitivity characterization value, the impact sensitivity category of the soil is determined to be a weakly sensitive category; If the soil impact sensitivity characterization value is greater than or equal to a preset soil impact sensitivity characterization value, the impact sensitivity category of the soil is determined to be a highly sensitive category.

4. The sealing wall construction method for soft soil foundation according to claim 3, characterized in that: Controlling the drilling rig action based on the shock-sensitive category includes: If the shock-sensitive category is a weakly sensitive category, the lifting speed of the drill bit and the spray intensity of the nozzle are adjusted simultaneously according to the shock-sensitive characterization value, and the height of the grouting liquid level in the borehole is continuously detected to determine whether the grouting meets the predetermined standard according to the height, so as to adjust the rotation speed of the drill bit; If the impact-sensitive category is a highly sensitive category, the lifting speed of the drill bit and the jet intensity of the nozzle are maintained to complete the grouting.

5. The sealing wall construction method for soft soil foundation according to claim 1, characterized in that: Adjusting the lifting speed of the drill bit of the drilling rig according to the impact sensitivity characterization value includes: The lifting speed of the drill bit of the drilling rig is reduced, and the reduction amount of the lifting speed is negatively correlated with the impact sensitivity characterization value.

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

7. The sealing wall construction method for soft soil foundation according to claim 1, characterized in that: Determining whether the grouting meets the predetermined standard based on the height includes: If the return grouting liquid level in the borehole is lower than the preset return grouting liquid level, it is determined that the grouting does not meet the predetermined standard; If the liquid level of the return grouting liquid in the borehole is greater than or equal to the preset liquid level of the return grouting liquid, it is determined that the grouting meets the predetermined standard.

8. The sealing wall construction method for soft soil foundation according to claim 7, characterized in that: If the grouting does not meet the predetermined standard, the rotation speed of the drill bit of the drilling rig is adjusted, wherein: The rotation speed of the drill bit is increased, and the increase is positively correlated with the height of the return slurry liquid level.

9. The sealing wall construction method for soft soil foundation according to claim 1, characterized in that: The bottom surface of the pre-detection pit body is a plane and the bottom surface area must be larger than a predetermined area reference threshold.

10. The sealing wall construction method 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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