Vibro-replacement gravel pile construction method capable of eliminating hole shrinkage phenomenon

Abstract

The vibro-replacement gravel pile construction method capable of eliminating the hole shrinkage phenomenon comprises the steps that injection current data containing hole depth parameters are sequentially obtained according to unit time in the hole guiding process; determining the soil layer hardness grade corresponding to the penetration current data of each hole depth parameter according to the penetration current data containing the hole depth parameters obtained in sequence, so as to obtain the soil layer hardness grades corresponding to different depths of the lead hole; according to the soil layer hardness grades corresponding to the different depths, a construction scheme for controlling the densified current and the vibration remaining time of a vibroflotation pile machine according to the hardness degrees of the different stratums in the gravel pile manufacturing process is generated; and in the gravel pile manufacturing process, the densification current and the vibration remaining time of the vibroflotation pile machine in densification of gravel pile filler are controlled according to the construction scheme, so that the diameter shrinkage phenomenon of the gravel pile is eliminated.

Description

Technical Field

[0001] This invention relates to the field of foundation reinforcement technology for water conservancy and hydropower projects, and more specifically, to a method for constructing vibratory compaction stone piles that can eliminate the phenomenon of diameter reduction. Background Technology

[0002] Vibro-compaction is a widely used foundation reinforcement technique in soft soil areas or areas with weak bearing capacity. Soft soil foundations are typically characterized by high void ratio, high water content, high compressibility, and low bearing capacity. This makes effective treatment of soft soil foundations crucial in engineering construction to prevent uneven settlement or even structural damage, and to ensure the quality and safety of engineering construction.

[0003] Vibro-compaction foundation treatment technology has advantages such as simple construction equipment, convenient operation, fast construction speed, and easy control of reinforcement quality. Moreover, the reinforcement materials used are only crushed stone and pebbles, which are readily available and inexpensive. Therefore, vibro-compaction technology has been widely used and continuously developed in large-scale soft soil foundation treatment projects such as reservoir dams and cofferdams in my country. However, vibro-compaction crushed stone pile foundation reinforcement is an underground, concealed project. The complexity of the pile's internal structure and the uncertainty of geological conditions lead to certain limitations in existing quality evaluation methods. Therefore, in-depth exploration and analysis of real-time evaluation methods based on multi-dimensional construction data are of great significance for the pile formation quality of vibro-compaction crushed stone piles and the effect of composite foundation reinforcement.

[0004] In particular, during the process of constructing crushed stone piles, problems are prone to occur. Figure 1 The reduced diameter shown will severely affect the foundation reinforcement effect. Summary of the Invention

[0005] The purpose of this application is to provide a vibratory compaction method for constructing stone piles that can eliminate the problem of diameter reduction, in order to address the shortcomings of the prior art.

[0006] According to a first embodiment of the present invention, a method for constructing vibro-compacted stone piles that can eliminate the diameter reduction phenomenon includes:

[0007] During the drilling process, the penetration current data containing the hole depth parameter is acquired sequentially at unit time intervals.

[0008] Based on the penetration current data containing hole depth parameters obtained sequentially, the soil hardness level corresponding to each penetration current data containing hole depth parameters is determined, so as to obtain the soil hardness level corresponding to different depths of the pilot hole.

[0009] Based on the soil hardness level corresponding to different depths, a construction plan is generated to control the densification current and vibration time of the vibratory pile driver during the crushed stone pile manufacturing process for different soil hardness levels.

[0010] During the crushed stone pile manufacturing process, the vibratory compaction machine is controlled according to the construction plan to adjust the current and vibration time of the crushed stone pile filling material in order to eliminate the shrinkage phenomenon of the crushed stone pile.

[0011] Preferably, the penetration current data containing the hole depth parameter is data that includes both a hole depth field and a penetration current field.

[0012] Preferably, during the pilot hole construction, the vibratory pile driver controller acquires the penetration current data containing hole depth parameters, including:

[0013] By acquiring the real-time movement length of the wire rope of the suspended vibratory pile driver, the hole depth field of the hole depth data can be obtained.

[0014] The penetration current data corresponding to the moving length of the wire rope is used as the penetration current field.

[0015] Then, the hole depth field and the penetration current field are combined to form the penetration current data containing the hole depth parameter.

[0016] Preferably, the construction scheme for controlling the densification current and vibration time of the vibratory compaction pile driver during the pile-making process of generating crushed stone piles, based on different soil hardness levels, includes:

[0017] Based on the different strata hardness levels, a construction plan is generated for the vibratory pile driver's densification current and vibration retention time, which are specific to the strata hardness levels corresponding to the construction depth.

[0018] According to the construction plan, a control program for controlling the operation of the vibratory pile driver is generated, and the generated control program is loaded into the vibratory pile driver controller.

[0019] Preferably, controlling the densification current and vibration duration of the vibratory compaction pile driver in accordance with the construction plan includes:

[0020] The vibratory pile driver controller determines the construction depth by acquiring the real-time movement length of the wire rope suspending the vibratory pile driver.

[0021] The vibratory pile driver controller controls the densification current and vibration duration of the vibratory pile driver for the crushed stone pile filler according to the construction depth.

[0022] According to a second embodiment of the present invention, a method for constructing vibro-compacted stone piles that can eliminate the diameter reduction phenomenon includes:

[0023] During the drilling process, multiple penetration current data containing hole depth parameters were obtained;

[0024] The formation hardness is classified using the multiple penetration current data containing hole depth parameters to obtain several formation hardness grades.

[0025] Based on the hardness grades of the aforementioned strata, a construction plan is generated to control the current and vibration time of the vibratory pile driver during the crushed stone pile manufacturing process, taking into account the hardness grades of different strata.

[0026] During the crushed stone pile manufacturing process, the vibratory compaction machine is controlled according to the construction plan to adjust the current and vibration time of the crushed stone pile filling material in order to eliminate the shrinkage phenomenon of the crushed stone pile.

[0027] Preferably, the penetration current data containing the hole depth parameter is data that includes both a hole depth field and a penetration current field.

[0028] Preferably, the step of classifying the formation hardness using the multiple penetration current data containing borehole depth parameters includes: performing a clustering operation on penetration current data with similar current values ​​to group them into a penetration current data cluster, thereby obtaining multiple penetration current data clusters; determining the formation depth range corresponding to each penetration current cluster based on the highest and lowest depth values ​​of the penetration current in each penetration current data cluster; and dividing the formation around the pilot borehole into multiple formations with different formation hardness levels based on the formation depth range corresponding to each penetration current cluster.

[0029] Preferably, the construction scheme for controlling the densification current and vibration time of the vibratory compaction pile driver during the pile making process of generating crushed stone piles includes: generating a construction scheme for the densification current and vibration time of the vibratory compaction pile driver according to the densification current and vibration time of the vibratory compaction pile driver for the densification current and vibration time of the vibratory compaction pile driver corresponding to the densification current and vibration level of the different densities; generating a control program for controlling the operation of the vibratory compaction pile driver according to the construction scheme, and loading the generated control program into the vibratory compaction pile driver controller.

[0030] Preferably, controlling the densification current and vibration time of the vibratory compaction pile driver in the densified crushed stone pile fill according to the construction plan includes: the vibratory compaction pile driver controller determines the construction depth by acquiring the moving length of the steel wire rope suspending the vibratory compaction pile driver in real time; the vibratory compaction pile driver controller controls the densification current and vibration time of the vibratory compaction pile driver in the crushed stone pile fill according to the construction depth.

[0031] The beneficial effects of this application are: real-time monitoring of abnormal situations during pile construction through data acquisition and preprocessing technology; and accurate identification and correction of localized diameter reduction phenomena through data analysis to assess pile quality and further reduce risks. Attached Figure Description

[0032] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.

[0033] Figure 1 A schematic diagram illustrating the diameter reduction phenomenon of crushed stone piles;

[0034] Figure 2 This is a schematic diagram of the first embodiment of the vibratory compaction stone pile construction method of the present invention, which can eliminate the diameter reduction phenomenon;

[0035] Figure 3 This is a schematic diagram of the second embodiment of the vibratory compaction stone pile construction method of the present invention, which can eliminate the diameter reduction phenomenon;

[0036] Figure 4 This is a stratigraphic identification map based on the AGNES clustering algorithm of this invention. Detailed Implementation

[0037] The specific embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. It should be understood that the present invention is not limited to the specific real-time embodiments. For those skilled in the art, various modifications will be obvious as long as they conform to the scope of the appended claims and the basic spirit of the present invention. Therefore, all inventions based on the concept of the present invention are within the scope of protection.

[0038] Figure 2 The first embodiment of the vibratory compaction method for constructing stone piles according to the present invention, which can eliminate the diameter reduction phenomenon, is shown, including:

[0039] During the drilling process, the penetration current data containing the hole depth parameter is acquired sequentially at unit time intervals.

[0040] Based on the penetration current data containing hole depth parameters obtained sequentially, the soil hardness level corresponding to each penetration current data containing hole depth parameters is determined, so as to obtain the soil hardness level corresponding to different depths of the pilot hole.

[0041] Based on the different soil hardness levels at different depths, a construction plan is generated to control the current of the vibratory pile driver and the vibration time during the crushed stone pile manufacturing process, taking into account the different soil hardness levels.

[0042] During the crushed stone pile manufacturing process, the vibratory compaction machine is controlled according to the construction plan to adjust the current and vibration time of the crushed stone pile filling material in order to eliminate the shrinkage phenomenon of the crushed stone pile.

[0043] The penetration current data containing hole depth parameters of the present invention includes data with hole depth field and penetration current field.

[0044] During the pilot hole construction, the vibratory pile driver controller acquires penetration current data containing hole depth parameters, including: acquiring the hole depth field of the hole depth data by acquiring the real-time movement length of the wire rope suspending the vibratory pile driver; using the penetration current data corresponding to the movement length of the wire rope as the penetration current field; and then synthesizing the hole depth field and the penetration current field and adding a sequence number indicating the acquisition time at the beginning to form the penetration current data containing hole depth parameters.

[0045] The construction scheme for controlling the densification current and vibration retention time of the vibratory compaction machine during the production of crushed stone piles for different soil hardness levels includes: generating a construction scheme for the densification current and vibration retention time of the vibratory compaction machine for the soil hardness level corresponding to the construction depth, based on the different soil hardness levels; generating a control program for controlling the operation of the vibratory compaction machine based on the construction scheme, and loading the generated control program into the vibratory compaction machine controller.

[0046] The control of the densification current and vibration time of the vibratory compaction pile machine for densifying the crushed stone pile fill according to the construction plan includes: the vibratory compaction pile machine controller determines the construction depth by acquiring the moving length of the steel wire rope suspending the vibratory compaction pile machine in real time; the vibratory compaction pile machine controller controls the densification current and vibration time of the vibratory compaction pile machine for the crushed stone pile fill according to the construction depth.

[0047] Figure 3 This invention illustrates a second embodiment of a vibro-compacted stone pile construction method that eliminates diameter reduction, comprising:

[0048] During the drilling process, multiple penetration current data containing hole depth parameters were obtained;

[0049] The formation hardness is classified using the multiple penetration current data containing hole depth parameters to obtain formation hardness levels at different depths.

[0050] Based on the different hardness levels of the strata at different depths, a construction plan is generated to control the current of the vibratory pile driver and the vibration time during the crushed stone pile manufacturing process, taking into account the different hardness levels of the strata.

[0051] During the crushed stone pile manufacturing process, the vibratory compaction machine is controlled according to the construction plan to adjust the current and vibration time of the crushed stone pile filling material in order to eliminate the shrinkage phenomenon of the crushed stone pile.

[0052] Penetration current data containing hole depth parameters includes both hole depth and penetration current fields.

[0053] The classification of formation hardness using the multiple penetration current data containing borehole depth parameters includes: clustering penetration current data with similar current values ​​into a single penetration current cluster, thus obtaining multiple penetration current clusters; determining the formation depth range corresponding to each penetration current cluster based on the highest and lowest penetration current depths in each cluster; and classifying the formation around the borehole into multiple formations with different hardness levels based on the formation depth range corresponding to each penetration current cluster.

[0054] The construction scheme for controlling the densification current and vibration time of the vibratory compaction machine during the production of crushed stone piles, based on different strata hardness levels, includes: generating a construction scheme for the densification current and vibration time of the vibratory compaction machine corresponding to the strata hardness level corresponding to the construction depth, based on the different strata hardness levels; generating a control program for controlling the operation of the vibratory compaction machine based on the construction scheme, and loading the generated control program into the vibratory compaction machine controller.

[0055] The control of the densification current and vibration time of the vibratory compaction pile machine for densifying the crushed stone pile fill according to the construction plan includes: the vibratory compaction pile machine controller determines the construction depth by acquiring the moving length of the steel wire rope suspending the vibratory compaction pile machine in real time; the vibratory compaction pile machine controller controls the densification current and vibration time of the vibratory compaction pile machine for the crushed stone pile fill according to the construction depth.

[0056] The following section will explain some details of the above content in the context of the upstream cofferdam foundation treatment project of Lawa:

[0057] (1) Hole depth monitoring. A depth sensor installed on the vibratory pile driver is used to sense the construction depth of the vibratory pile driver by collecting the length of the moving wire rope.

[0058] (2) Current monitoring. This includes the penetration current during the pre-hole drilling process and the densification current during the pile making process. Both are monitored by using a 400 / 5 current transformer to collect the real-time current value of the vibratory compactor. This type of current transformer can convert large currents into small currents for measurement and monitoring.

[0059] The information sensors on the vibratory compactor collect and transmit data at a rate of one data point per second. Although each crushed stone pile records a large amount of data, not all of it is valid. Data preprocessing is required to remove duplicate, abnormal, or invalid data and improve data quality. The implementation method is as follows:

[0060] (1) Data classification and process differentiation

[0061] Acquire all raw data collected from the vibratory compactor equipment. Based on specific fields in the data (whether they contain markers for crushed stone fill), categorize the data into "pre-drilling process" and "pile-making process." Add or confirm process markers for each data entry to clearly identify its process.

[0062] (2) Remove invalid data points

[0063] Remove invalid movement data: Check the movement direction information of each data point. If the movement direction of the vibratory compactor is opposite to the construction direction (indicating a non-working state), remove these data points from the dataset.

[0064] Remove paused construction data: Identify and remove data points that indicate a pause in construction based on log information or specific status markers (such as "paused" status) in the data.

[0065] Remove data with zero current: Check the current value of each data point. If the current is zero (which may indicate that the device is not working or the data is recorded incorrectly), remove these data points from the dataset.

[0066] (3) Effective current data points during pile making process

[0067] The minimum effective encryption current for this project is 190A. If the current value is lower than 190A, it indicates that the oscillation equipment has not fully utilized its encryption potential or that the equipment is malfunctioning. Therefore, all records with current readings below 190A are considered invalid data and are discarded.

[0068] (4) Filtering depth data points

[0069] Linear Depth Verification: For data from each process, analyze the trend of depth data changes. Use chart analysis to identify whether the depth data shows a linear change, thereby determining whether the vibratory beater is in an effective working state.

[0070] Data filtering at the same depth: When multiple data points exist at the same depth, the data point corresponding to the earliest timestamp is selected as the representative of that depth. During data filtering, sorting and deduplication methods are used to ensure that for each unique depth value, only the first occurrence (i.e., the earliest) of the data record is retained.

[0071] This invention proposes the concept of power conservation during the pre-drilling process of vibratory compaction stone piles, the expression of which is as follows:

[0072] P = I * U = α * F s *V

[0073] In the formula: P is the work done per unit time during the pre-drilling process of the crushed stone pile, W; I is the current during pre-drilling, i.e., the penetration current value, A; U is the pre-drilling voltage, V; α is a certain constant; F sdenoted as N, representing the drilling force during the pilot hole drilling process; V represents the penetration rate of the crushed stone pile during the pilot hole drilling process, obtained by the change in depth per unit time, in m / s.

[0074] During the pre-drilling process of the crushed stone pile, due to the low drilling speed and the fact that the main soil layers of the foundation are silty sand and low-liquid-limit clay, the axial viscous force can be ignored. The work done by the crushed stone pile per unit time can be regarded as the energy consumed in breaking up the soil layers. The values ​​of the penetration current I and penetration rate V can be obtained through real-time monitoring data. With the construction voltage value being a fixed value, the drilling force F can be calculated. s and use F s This indicates different geological types during the pre-drilling process of vibratory crushing stone piles.

[0075] To accurately analyze the state of different formations, this invention employs the AGNES clustering algorithm to process the drilling force F. s Data. AGNES is a bottom-up hierarchical clustering algorithm that discovers the inherent structure of data by progressively merging data points into increasingly larger clusters. In the geological engineering of vibro-compacted stone pile pilot holes, the AGNES algorithm is used to process penetration current data, grouping data points with similar current characteristics into the same category, revealing different strata types and their spatial distribution patterns. Therefore, by studying the magnitude of the penetration current, the influence of geological factors on the local diameter reduction of the pile can be analyzed. The specific method is as follows:

[0076] Input a set of data samples and define the threshold K for the cluster.

[0077] Each sample is treated as an initial cluster, and the two closest clusters are found according to the Euclidean distance formula.

[0078] By continuously merging two clusters that are close to each other to form a new set of clusters, the center point of each cluster is recalculated.

[0079] The result is output when the defined threshold K for the number of clusters is reached.

[0080] In this embodiment, we assume that the dataset D = {x} i {i = 1, 2, ..., n} is the preprocessed sample set of borehole construction data, c j (j = 1, 2, ..., k) represents the j-th cluster of the clustering, and the Euclidean expression for the distance between two data objects is:

[0081]

[0082] If cluster c i An object and a cluster c j The distance between any two objects in a given cluster is the smallest among all Euclidean distances between objects belonging to different clusters, c. i and c jThey may be merged. All objects in each cluster represent the similarity between two clusters, determined by the similarity of the nearest pairs of data points in those two clusters. The distance between clusters is:

[0083]

[0084] In each iteration, the objective function value is optimized by continuously adjusting the cluster merging strategy and the weights of feature parameters, thereby achieving the best clustering effect. Based on the preset number of clusters, the AGNES hierarchical clustering algorithm is used for stratigraphic identification of soft foundations. The AGNES algorithm starts by treating each data point as an independent cluster, gradually merging the most similar clusters and continuously updating the distance between clusters. By adjusting the merging strategy and the weights of feature parameters, the objective function is optimized, ultimately achieving the best stratigraphic identification result.

[0085] In this embodiment, the Lawa Hydropower Station is located on the upper reaches of the Jinsha River, at the border between Sichuan and Tibet, and is a Class I (1) large-scale project. The maximum thickness of the riverbed overburden is 71.6m, and its material composition is complex, mainly consisting of 4 layers: Q al-5 Alluvial sand and gravel layer, 1.8m to 10.8m thick; Q l-3 The landslide dammed lake deposits sandy silt and silty sand in still water, with a thickness of approximately 15m to 25m in the dam area; Q l-2 The still-water sedimentary layer of the landslide dammed lake has a maximum thickness of 32.5m; Q al-1 The soil is primarily composed of alluvial sand, gravel, and boulders, typically 5-15 meters thick. To reduce the randomness of the initial cluster configuration, AGNES can use statistical features of the class structure within the dataset to adjust the merging strategy, thereby improving clustering stability and accuracy. The cluster threshold K is defined as 4, and the final recognition result is as follows: Figure 4 As shown, the stratum where a certain vibratory compaction stone pile is located was divided into 4 layers using the AGNES clustering algorithm, among which 12-27m is Q. l-3 The soil in this layer is significantly softer; the layer at 27-35m is Q. l-2-③ Layer; 35-42m is Q l-2-② The stratum is mainly composed of low-liquid-limit silt and sandy low-liquid-limit silt; 42-52m is Q l-2-① Layers. Clustering results show the entire Q layer. l-2 The maximum thickness of the layer is 25m, lower than the maximum thickness of 32.5m recorded in geological exploration data. Furthermore, Q... l-2-① Layers and Q l-2-③ The layers are mainly composed of low liquid limit clay, and the clustering results show similarity. The results of the AGNES hierarchical clustering algorithm are consistent with the soil layer distribution obtained from the preliminary exploration in the cofferdam foundation, verifying that the penetration current can effectively reflect the stratum information, and based on this, the influence of the stratum on the pile diameter is analyzed.

[0086] This embodiment includes the pile type with reduced diameter section, the penetration current of the pilot hole, and the distribution of the reinforcement current and vibration time along the depth during pile construction. When encountering soft soil layers, the reinforcement current decreases significantly, and the vibration time needs to be extended to increase the reinforcement current. The penetration current at the depth near the locally reduced diameter section is significantly lower, indicating that there may be a weak interlayer at this depth. Improper construction control can easily lead to localized reduction in diameter. The reinforcement current at the lower part of the locally reduced diameter section shows a monotonically increasing trend within a certain depth range, indicating that the reinforcement section length in these areas is relatively long. Although the reinforcement current and vibration time meet the requirements, localized reduction in diameter may still occur. In addition to controlling the reinforcement current and vibration time during construction, the lifting and lowering distance of the vibratory compactor must be strictly controlled, limiting the length of the reinforcement section for each vibration compaction to 0.5–1.0 m to effectively prevent reduction in diameter.

[0087] Although the present invention has been described in detail above, it is not limited thereto, and those skilled in the art can make various modifications based on the principles of the present invention. Therefore, all modifications made in accordance with the principles of the present invention should be understood to fall within the protection scope of the present invention.

Claims

1. A method for constructing vibro-compacted stone piles that can eliminate the diameter reduction phenomenon, comprising: During the drilling process, the penetration current data containing the hole depth parameter is acquired sequentially at unit time intervals. Based on the penetration current data containing hole depth parameters obtained sequentially, the soil hardness level corresponding to each penetration current data containing hole depth parameters is determined, so as to obtain the soil hardness level corresponding to different depths of the pilot hole. Based on the soil hardness level corresponding to different depths, a construction plan is generated to control the densification current and vibration time of the vibratory pile driver during the crushed stone pile manufacturing process for different soil hardness levels. During the crushed stone pile manufacturing process, the vibratory compaction machine is controlled according to the construction plan to adjust the current and vibration time of the crushed stone pile filling material in order to eliminate the shrinkage phenomenon of the crushed stone pile.

2. The vibro-compaction stone pile construction method according to claim 1, wherein the penetration current data containing the hole depth parameter is data including a hole depth field and a penetration current field.

3. The vibro-compacting stone pile construction method according to claim 2, wherein during the pilot hole construction, the vibro-compacting pile driver controller acquires the penetration current data containing hole depth parameters, including: By acquiring the real-time movement length of the wire rope of the suspended vibratory pile driver, the hole depth field of the hole depth data can be obtained. The penetration current data corresponding to the moving length of the wire rope is used as the penetration current field. Then, the hole depth field and the penetration current field are combined to form the penetration current data containing the hole depth parameter.

4. The vibratory compaction method for constructing stone piles according to claim 3, wherein the construction scheme for controlling the densification current and vibration retention time of the vibratory compaction machine for different soil hardness levels during the stone pile production process includes: Based on the different soil hardness levels, a construction plan is generated for the vibratory pile driver's densification current and vibration retention time, which are specific to the soil hardness level corresponding to the construction depth. According to the construction plan, a control program for controlling the operation of the vibratory pile driver is generated, and the generated control program is loaded into the vibratory pile driver controller.

5. The vibro-compaction stone pile construction method according to claim 4, wherein controlling the densification current and vibration retention time of the vibro-compaction pile machine in densifying the stone pile fill according to the construction plan includes: The vibratory pile driver controller determines the construction depth by acquiring the real-time movement length of the wire rope suspending the vibratory pile driver. The vibratory pile driver controller controls the densification current and vibration duration of the vibratory pile driver for the crushed stone pile filler according to the construction depth.

6. A method for constructing vibro-compacted stone piles that can eliminate the diameter reduction phenomenon, comprising: During the drilling process, multiple penetration current data containing hole depth parameters were obtained; The formation hardness is classified using the multiple penetration current data containing hole depth parameters to obtain several formation hardness grades. Based on the hardness grades of the aforementioned strata, a construction plan is generated to control the current and vibration time of the vibratory pile driver during the crushed stone pile manufacturing process, taking into account the hardness grades of different strata. During the crushed stone pile manufacturing process, the vibratory compaction machine is controlled according to the construction plan to adjust the current and vibration time of the crushed stone pile filling material in order to eliminate the shrinkage phenomenon of the crushed stone pile.

7. The vibro-compaction stone pile construction method according to claim 6, wherein the penetration current data containing the hole depth parameter is data including a hole depth field and a penetration current field.

8. The vibro-compaction stone pile construction method according to claim 6, wherein the step of classifying the hardness of the strata using the multiple penetration current data containing hole depth parameters includes: Clustering is performed on the penetration current data with similar current values ​​to group them into a single penetration current data cluster, thus obtaining multiple penetration current data clusters. Based on the highest and lowest depth values ​​of the penetration current in each penetration current cluster, determine the formation depth range corresponding to each penetration current cluster. Based on the formation depth range corresponding to each penetration current cluster, the formation around the borehole is divided into multiple formations with different formation hardness levels.

9. The vibro-compaction stone pile construction method according to claim 8, wherein the construction scheme for controlling the densification current and vibration retention time of the vibro-compaction pile driver during the stone pile generation process for different strata hardness levels includes: Based on the different strata hardness levels, a construction plan is generated for the vibratory pile driver's densification current and vibration retention time, which are specific to the strata hardness levels corresponding to the construction depth. According to the construction plan, a control program for controlling the operation of the vibratory pile driver is generated, and the generated control program is loaded into the vibratory pile driver controller.

10. The vibro-compaction stone pile construction method according to claim 9, wherein controlling the densification current and vibration retention time of the vibro-compaction pile machine in densifying the stone pile fill according to the construction plan includes: The vibratory pile driver controller determines the construction depth by acquiring the real-time movement length of the wire rope suspending the vibratory pile driver. The vibratory pile driver controller controls the densification current and vibration duration of the vibratory pile driver for the crushed stone pile filler according to the construction depth.

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