Method for evaluating compaction degree of lime-soil compaction pile in collapsible loess

Abstract

The present application belongs to the technical field of foundation treatment, and in particular to a method for evaluating the compaction degree of lime-soil compaction piles in collapsible loess, comprising the following steps: Step 1, determining the construction parameters of the compaction piles. The method for evaluating the compaction degree of lime-soil compaction piles in collapsible loess comprises steps 1 to 7. When evaluating the compaction degree of lime-soil compaction piles in collapsible loess, an indoor compaction test scheme is designed, the optimal combination of the maximum compaction degree of the soil in the lime-soil pile is determined, and each layer of lime-soil is detected during the compaction and forming of the lime-soil compaction pile. When the detection is unqualified, an alarm is given to realize real-time and rapid detection of the compaction degree of the lime-soil compaction pile, thereby solving the problems that in the prior art, after the lime-soil compaction pile is formed, manual detection is performed, which not only has low detection efficiency, but also when the detection is unqualified after the compaction pile is formed, the pile body needs to be completely reworked, which affects the construction period and increases the construction cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation treatment, in particular to a method for evaluating compaction degree of lime-soil compaction pile in collapsible loess. BACKGROUND

[0002] Collapsible loess is an unsaturated under-compacted soil, which has low compressibility and high strength under natural humidity, but causes large collapsible deformation under the influence of additional pressure or self-weight pressure after being soaked with water. Therefore, such soil must be treated before being used as the foundation of a building. Lime-soil compaction pile is an effective and convenient method for treating collapsible loess foundation, which uses hammering to drive a steel pipe into the soil to laterally compact the pipe into a hole, and then backfills the pile hole with lime-soil in a certain volume ratio of 2:8 or 3:7 after the pipe is pulled out, and the lime-soil is compacted to form a pile. The lime-soil compaction pile and the soil between the piles together form a composite foundation to bear the load of the upper part.

[0003] During the treatment of the foundation by the lime-soil compaction pile, in order to ensure that the load requirement of the composite foundation is met, the compaction degree of the lime-soil compaction pile needs to be detected. The existing detection of the compaction degree of the lime-soil compaction pile is performed manually after the lime-soil compaction pile is formed. This construction detection method not only has low detection efficiency, but also requires the pile body to be completely reworked when the lime-soil compaction pile is detected as unqualified after being formed, which affects the construction period and increases the construction cost. Therefore, a method for evaluating the compaction degree of the lime-soil compaction pile in collapsible loess is needed. SUMMARY

[0004] Based on the existing technical problem that the lime-soil compaction pile is manually detected after being formed during the treatment of the foundation by the lime-soil compaction pile, which not only has low detection efficiency, but also requires the pile body to be completely reworked when the lime-soil compaction pile is detected as unqualified after being formed, which affects the construction period and increases the construction cost, the present application provides a method for evaluating the compaction degree of the lime-soil compaction pile in collapsible loess.

[0005] The method for evaluating the compaction degree of the lime-soil compaction pile in collapsible loess provided by the present application comprises the following steps:

[0006] Step one, determine the construction parameters of the compaction pile, including the lime-soil ratio, the water content, the number of hammering, the hammering energy, the thickness of the filler, the soil compaction speed, the soil compaction time and the soil compaction frequency.

[0007] Step two, indoor compaction test, design an indoor compaction test scheme, determine the optimal combination of the maximum compaction degree of the lime-soil pile soil, and perform fitting regression analysis on the test results to establish an explicit prediction model between the compaction degree of the lime-soil filler and the influencing factors.

[0008] Step three, construction monitoring, during the construction of the compaction pile, the compaction degree of the lime-soil compaction pile is monitored by setting the construction monitoring device.

[0009] The construction monitoring device comprises a compaction degree monitoring platform for compaction degree monitoring of the compaction pile construction, and a comparative analysis module connected with the compaction degree monitoring platform for data comparative analysis and processing, and an indoor compaction simulation database connected with the comparative analysis module for simulation data storage.

[0010] The compaction degree monitoring platform is electrically connected with a controller through a wireless communication module, and the controller is electrically connected with a lime-soil compaction pile compaction degree detection mechanism for detecting the compaction degree of the lime-soil compaction pile and a construction site alarm module for data anomaly alarm.

[0011] The construction site alarm module is an audible and visual alarm.

[0012] The controller is electrically connected with a data storage module for storing the detection data of the lime-soil compaction pile compaction degree detection mechanism.

[0013] Step four, sampling verification, a certain number of sampling points are selected around the compaction pile, and the standard penetration test is usually used to obtain the compressive strength index of the soil.

[0014] Step five, test detection, the dynamic penetration method or the static penetration method is used to obtain the compressive strength of the soil under the compaction pile, and multiple tests are performed to obtain the average value.

[0015] Step six, comparison and evaluation, by comparing the compressive strength of the soil under the compaction pile and the compressive strength of the soil around the compaction pile, the effect of the compaction pile on the compaction of the soil is evaluated.

[0016] Step seven, according to the evaluation result, appropriate adjustment measures are taken, the compaction degree is improved by changing the soil compaction parameters or increasing the number of compaction piles.

[0017] Preferably, the lime-soil compaction pile compaction degree detection mechanism comprises a rammer for compaction pile construction, a pressure cavity for compaction degree detection is formed in the upper surface of the rammer, hydraulic oil is arranged in the pressure cavity, a sealing disc for sealing the pressure cavity is threadedly connected to the inner wall of the pressure cavity, and a driving screw whose surface is rotatably connected to the surface of the sealing disc is rotatably connected to the inner bottom wall of the pressure cavity through a bearing.

[0018] Preferably, a speed reducer is fixedly installed on the upper surface of the sealing disc, one end of the driving screw penetrates through the sealing disc and extends to the power output end of the speed reducer, and the one end of the driving screw is fixedly connected with the power output end of the speed reducer.

[0019] Preferably, the surface of the speed reducer is fixedly installed with a driving motor electrically connected with the controller through a cable, and an output shaft of the driving motor is fixedly connected with the power input end of the speed reducer.

[0020] Preferably, the surface of the driving screw is threadedly connected with a pressurizing piston, the surface of the pressurizing piston is slidably connected with two symmetrically distributed stop limit rods, one end of the stop limit rod is threadedly connected with the inner bottom wall of the pressurizing cavity, and the other end of the stop limit rod penetrates and extends to the upper surface of the sealing disc.

[0021] Preferably, the surface of the driving motor is sleeved with a fixed connection pipe fixedly connected with the surface of the rammer, the surface of the fixed connection pipe is fixedly connected with a fixed sealing cover with a conical shape fixedly connected with the surface of the rammer, and the surface of the fixed sealing cover and the fixed connection pipe is fixedly connected with a hammer rod.

[0022] Preferably, the surface of the rammer is provided with three detection cavities arranged in a ring array with the axis of the pressurizing cavity as the center, the inner bottom wall of the detection cavity is provided with a detection hole, the inner wall of the detection hole is slidably connected with a detection rod, and one end of the detection rod extends to the inner wall of the detection cavity.

[0023] Preferably, the inner wall of the detection cavity is slidably connected with a pressure-bearing piston, and the lower surface of the pressure-bearing piston is fixedly connected with one end of the detection rod.

[0024] The surface of the detection rod is sleeved with a pressure-bearing spring, and both ends of the pressure-bearing spring are fixedly connected with the lower surface of the pressure-bearing piston and the inner bottom wall of the detection cavity, respectively.

[0025] Preferably, the inner wall of the detection cavity is threadedly connected with a sealing cover, the surface of the sealing cover is fixedly connected in communication with a pressurizing oil pipe, and one end of the pressurizing oil pipe penetrates and extends to the inner wall of the pressurizing cavity.

[0026] Preferably, the surface of the pressurizing oil pipe is fixedly installed with a pressure sensor, and the pressure sensor is electrically connected with the controller through a cable.

[0027] The beneficial effects in the application are:

[0028] 1. By setting steps 1 to 7, when evaluating the compaction degree of lime-soil compaction pile in collapsible loess, the influence factors of lime-soil compaction pile body compaction degree such as lime-soil ratio, water content, hammering times, hammering energy, and filler thickness are considered, the indoor compaction test scheme is designed, the action mechanism of the influence factors of lime-soil filler compaction degree is revealed through a series of compaction tests, the optimal combination of the maximum compaction degree of the lime-soil pile soil is determined, the fitting regression analysis of the test results is carried out to establish the explicit prediction model between the lime-soil filler compaction degree and the influence factors, and during the compaction forming process of the lime-soil compaction pile, the lime-soil of each layer is detected, and when the detection is unqualified, the alarm is given, so that the compaction degree of the lime-soil compaction pile is detected in real time, thereby solving the problems that the existing lime-soil compaction pile for treating the foundation needs to be detected manually after the compaction pile is formed, the detection efficiency is low, and when the compaction pile is detected to be unqualified after being formed, the whole pile needs to be reworked, which affects the construction period and increases the construction cost.

[0029] 2. By setting the construction monitoring device, the compaction of the lime-soil compaction pile is monitored during the construction process of the lime-soil compaction pile, the rapid detection and rapid comparative analysis are realized, the alarm is given when the compaction degree does not meet the requirements, the whole lime-soil compaction pile is prevented from being reworked after being formed, the construction data of the lime-soil compaction pile is stored and recorded, data support is provided for subsequent compaction degree evaluation, and the effect of the compaction degree evaluation of the lime-soil compaction pile is better. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A schematic diagram of a lime-soil compaction pile compaction degree evaluation method in collapsible loess is provided for the present application.

[0031] Figure 2 A ram structure perspective view of a lime-soil compaction pile compaction degree evaluation method in collapsible loess is provided for the present application.

[0032] Figure 3 A fixed connection pipe structure perspective view of a lime-soil compaction pile compaction degree evaluation method in collapsible loess is provided for the present application.

[0033] Figure 4 A speed reducer structure perspective view of a lime-soil compaction pile compaction degree evaluation method in collapsible loess is provided for the present application.

[0034] Figure 5 A detection hole structure perspective view of a lime-soil compaction pile compaction degree evaluation method in collapsible loess is provided for the present application.

[0035] Figure 6 A driving motor structure perspective view of a lime-soil compaction pile compaction degree evaluation method in collapsible loess is provided for the present application.

[0036] Fig. 1, compaction monitoring platform; 2, comparative analysis module; 3, indoor compaction simulation database; 4, controller; 5, lime-soil compaction pile compaction detection mechanism; 501, rammer; 502, pressurized cavity; 503, sealing disc; 504, drive screw; 505, speed reducer; 506, drive motor; 507, pressurized piston; 508, stop limit rod; 509, fixed connection pipe; 510, fixed sealing cover; 511, hammer rod; 512, detection cavity; 513, detection hole; 514, detection rod; 515, pressure-bearing piston; 516, pressure-bearing spring; 517, sealing cover; 518, pressurized oil pipe; 519, pressure sensor; 6, construction site alarm module; 601, audible and visual alarm; 7, data storage module. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0038] Reference Figures 1-6 A method for evaluating compaction degree of lime-soil compaction pile in collapsible loess, comprising the following steps:

[0039] Step one, determine the construction parameters of the compaction pile, including the influence factors of the compaction degree of the lime-soil compaction pile body, such as lime-soil ratio, water content, number of hammering, hammering energy, filler thickness, soil compaction speed, soil compaction time and soil compaction frequency.

[0040] Step two, indoor compaction test, design indoor compaction test scheme according to orthogonal test principle, reveal the action mechanism of the influence factors of the compaction degree of the lime-soil filler through a series of compaction tests, determine the optimal combination of the maximum compaction degree of the soil of the lime-soil pile, and perform fitting regression analysis on the test results to establish an explicit prediction model between the compaction degree of the lime-soil filler and each influence factor.

[0041] Specifically, step two, indoor compaction test, comprising the following steps:

[0042] S1, determine the research purpose, and clarify the problems to be studied and the factors to be evaluated.

[0043] S2, select factors, determine the factors involved according to the research purpose, such as compaction energy, compaction frequency, soil water content, etc.

[0044] S3, determine the level, for each factor, determine different levels or value ranges, such as high, medium and low levels.

[0045] S4. Construct the experimental design table. According to the selected factors and levels, use the orthogonal experimental design method to construct the experimental design table. The orthogonal experimental design table can be obtained from professional software or literature.

[0046] S5. Perform the experiment. According to the scheme in the experimental design table, conduct the indoor compaction test. For each test condition, record the relevant data and observation results.

[0047] S6. Data analysis. Use statistical methods to analyze the test data, including variance analysis, regression analysis, etc., to determine the degree of influence of each factor on the results.

[0048] S7. Result interpretation. According to the data analysis results, judge the primary and secondary effects of each factor and the optimal factor combination.

[0049] S8. Conclusion and recommendations. Based on the test results, draw conclusions and provide corresponding recommendations, such as optimizing compaction parameters or changing soil treatment methods.

[0050] Step three, construction monitoring. During the construction of the compaction pile, a construction monitoring device is set up to monitor the compaction degree of the lime-soil compaction pile.

[0051] The construction monitoring device includes a compaction degree monitoring platform 1 for compaction degree monitoring of the compaction pile, a comparative analysis module 2 connected to the compaction degree monitoring platform 1 for data comparison and analysis processing, and an indoor compaction simulation database 3 connected to the comparative analysis module 2 for simulation data storage.

[0052] Further, in use, the compaction degree monitoring platform 1 compares and analyzes the simulation data of the indoor compaction simulation database 3 and the construction site data through the comparative analysis module 2, and feeds back to the compaction degree monitoring platform 1.

[0053] The compaction degree monitoring platform 1 is electrically connected to a controller 4 through a wireless communication module, and the controller 4 is electrically connected to a lime-soil compaction pile compaction degree detection mechanism 5 for detecting the compaction degree of the lime-soil compaction pile and a construction site alarm module 6 for data anomaly alarm.

[0054] The construction site alarm module 6 is an audible and visual alarm 601.

[0055] The controller 4 is electrically connected to a data storage module 7 for storing the detection data of the lime-soil compaction pile compaction degree detection mechanism 5.

[0056] Further, in use, the compaction degree of the lime-soil compaction pile during construction is detected by the lime-soil compaction pile compaction degree detection mechanism 5, and the detection data is fed back to the controller 4 and the data storage module 7 for storage. The controller 4 feeds back the detection data of the lime-soil compaction pile compaction degree detection mechanism 5 to the compaction degree monitoring platform 1 through the wireless communication module. After the compaction degree monitoring platform 1 obtains the lime-soil compaction pile compaction degree detection data, the simulated data in the indoor compaction simulation database 3 is called by the comparative analysis module 2, and is compared and analyzed with the lime-soil compaction pile compaction degree detection data. When data anomalies occur, the compaction degree monitoring platform 1 feeds back to the controller 4 through the wireless communication module. After the controller 4 receives the data anomaly information, the controller 4 controls the construction site alarm module 6 to perform on-site sound and light alarm.

[0057] The lime-soil compaction pile compaction degree detection mechanism 5 comprises a rammer 501 for compaction pile construction. The upper surface of the rammer 501 is provided with a pressurized cavity 502 for compaction degree detection. The inside of the pressurized cavity 502 is provided with hydraulic oil. The inner wall of the pressurized cavity 502 is threadedly connected with a sealing disc 503 for sealing the pressurized cavity 502. The inner bottom wall of the pressurized cavity 502 is rotatably connected with a drive screw 504 whose surface is rotatably connected with the surface of the sealing disc 503 through a bearing.

[0058] The upper surface of the sealing disc 503 is fixedly installed with a speed reducer 505. One end of the drive screw 504 penetrates through the sealing disc 503 and extends to the power output end of the speed reducer 505. The one end of the drive screw 504 is fixedly connected with the power output end of the speed reducer 505.

[0059] The surface of the speed reducer 505 is fixedly installed with a drive motor 506 which is electrically connected with the controller 4 through a cable. The output shaft of the drive motor 506 is fixedly connected with the power input end of the speed reducer 505.

[0060] The surface of the drive screw 504 is threadedly connected with a pressurizing piston 507. The surface of the pressurizing piston 507 is slidably connected with two symmetrically distributed stop limit rods 508. One end of the stop limit rod 508 is threadedly connected with the inner bottom wall of the pressurized cavity 502. The other end of the stop limit rod 508 penetrates through and extends to the upper surface of the sealing disc 503.

[0061] In use, the drive motor 506 is automatically controlled to work by the controller 4. The drive motor 506 drives the drive screw 504 to rotate through the speed reducer 505. The drive screw 504 drives the pressurizing piston 507 to move up and down linearly along the surface of the two stop limit rods 508 in the inner wall of the pressurized cavity 502, so as to pressurize or depressurize the hydraulic oil in the pressurized cavity 502.

[0062] The surface sleeve of the driving motor 506 is connected with the fixed connection pipe 509 fixedly connected with the surface of the rammer 501, the surface of the fixed connection pipe 509 is fixedly connected with the fixed sealing cover 510 fixedly connected with the surface of the rammer 501, the surface of the fixed sealing cover 510 and the fixed connection pipe 509 is fixedly connected with the hammer rod 511.

[0063] The surface of the rammer 501 is provided with three detection cavities 512 arranged in a ring array with the axis of the pressure cavity 502 as the center, the inner bottom wall of the detection cavity 512 is provided with a detection hole 513, the inner wall of the detection hole 513 is slidably connected with a detection rod 514, one end of the detection rod 514 extends to the inner wall of the detection cavity 512.

[0064] The inner wall of the detection cavity 512 is slidably connected with a pressure bearing piston 515, the lower surface of the pressure bearing piston 515 is fixedly connected with one end of the detection rod 514.

[0065] The surface of the detection rod 514 is sleeved with a pressure bearing spring 516, both ends of the pressure bearing spring 516 are fixedly connected with the lower surface of the pressure bearing piston 515 and the inner bottom wall of the detection cavity 512.

[0066] The inner wall of the detection cavity 512 is threadedly connected with a sealing cover 517, the surface of the sealing cover 517 is fixedly connected with a pressurized oil pipe 518, one end of the pressurized oil pipe 518 penetrates and extends to the inner wall of the pressure cavity 502.

[0067] The surface of the pressurized oil pipe 518 is fixedly installed with a pressure sensor 519, the pressure sensor 519 is electrically connected with the controller 4 through a cable.

[0068] Further, the working principle of the construction monitoring device is that: first, according to the influence factors of the soil-cement pile body compactness such as the soil-cement ratio, the water content, the number of hammering, the hammering energy, the filler thickness, the soil squeezing speed, the soil squeezing time and the soil squeezing frequency, indoor compaction simulation is carried out, and an indoor compaction simulation database 3 is established.

[0069] Then in the construction process of the lime-soil compaction pile, the hammer rod 511 is driven to move by the compaction pile machine, driving the connecting pipe, the fixed sealing cover 510 and the rammer 501 to move, compacting the lime-soil, and during the compaction process, after each layer of lime-soil is compacted, the controller 4 automatically controls the driving motor 506 to work, the driving motor 506 drives the driving screw rod 504 to rotate through the speed reducer 505, the driving screw rod 504 drives the pressurizing piston 507 to move linearly downward along the surface of the two stop limit rods 508 inside the wall of the pressurizing cavity 502, pressurizing the hydraulic oil inside the pressurizing cavity 502, the hydraulic oil inside the pressurizing cavity 502 enters the detection cavity 512 through the pressurizing oil pipe 518, pushing the pressure-bearing piston 515 to move downward in the detection cavity 512, driving the pressure-bearing piston 515 and the detection rod 514 to move, the detection rod 514 extends out through the detection hole 513 and contacts the compacted lime-soil layer to detect the compactness of the lime-soil layer, during the detection process, the pressure sensor 519 installed on the pressurizing oil pipe 518 monitors the oil pressure inside the pressurizing oil pipe 518 and feeds back to the controller 4 and the data storage module 7 for storage, the controller 4 feeds back the compactness monitoring platform 1 through the wireless communication module, and the indoor compaction simulation database 3 is called through the comparative analysis module 2 to compare and analyze the compaction data of the lime-soil compaction pile, when data anomaly occurs, the compactness monitoring platform 1 feeds back to the controller 4 through the wireless communication module, and the controller 4 accepts the data anomaly information and controls the construction site alarm module 6 to sound and light alarm on site.

[0070] By setting the construction monitoring device, the lime-soil compaction pile is monitored during the construction process, rapid detection and rapid comparative analysis are realized, and when the compactness does not meet the requirements, alarm is quickly given to prevent the entire lime-soil compaction pile from being reworked after being formed, and the construction data of the lime-soil compaction pile is stored for record, which provides data support for subsequent compactness evaluation, thereby achieving better compactness evaluation effect of the lime-soil compaction pile.

[0071] Step four, sampling verification, a certain number of sampling points are selected around the compaction pile, and the standard penetration test (SPT) is usually used to obtain the compressive strength index of the soil.

[0072] Step five, test detection, the dynamic penetration method or the static penetration method is used to obtain the compressive strength of the soil under the compaction pile, and multiple tests are performed to obtain the average value.

[0073] Step six, comparison and evaluation, by comparing the compressive strength of the soil under the compaction pile and the compressive strength of the soil around the compaction pile, the effect of the compaction pile on the compaction of the soil is evaluated.

[0074] Step seven, according to the evaluation results, take appropriate adjustment measures, such as by changing the compaction parameters or increase the number of compaction piles, to improve the degree of compaction.

[0075] By setting steps one to seven, when evaluating the compaction degree of lime-soil compaction piles in collapsible loess, the influence factors of the compaction degree of the lime-soil compaction pile body, such as lime-soil ratio, water content, number of hammering, hammering energy, and filler thickness, are considered. The indoor compaction test scheme is designed, a series of compaction tests are carried out to reveal the action mechanism of the influence factors of the compaction degree of the lime-soil filler, the optimal combination of the maximum compaction degree of the lime-soil pile soil is determined, the test results are fitted and regressed to establish the explicit prediction model between the compaction degree of the lime-soil filler and each influence factor, and the lime-soil of each layer is detected during the compaction and forming process of the lime-soil compaction pile. When the detection is unqualified and abnormal, an alarm is given to realize the real-time and rapid detection of the compaction degree of the lime-soil compaction pile, thereby solving the problem that in the existing process of treating the foundation by the lime-soil compaction pile, after the compaction pile is formed, manual detection is carried out. The detection efficiency is low, and when the unqualified detection is detected after the compaction pile is formed, the pile body needs to be completely reworked, which affects the construction period and increases the construction cost.

[0076] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art, according to the technical solution and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for evaluating the compaction degree of lime-soil compaction piles in collapsible loess, characterized in that, The method comprises the following steps: Step one, determining the construction parameters of the compaction pile, including the lime-soil ratio, water content, hammering times, hammering energy, filler thickness, compaction speed, compaction time and compaction frequency; Step two, indoor compaction test, designing an indoor compaction test scheme, determining the optimal combination of the maximum compaction degree of the lime-soil pile soil, and performing fitting regression analysis on the test results to establish an explicit prediction model between the lime-soil filler compaction degree and various influencing factors; Step three, construction monitoring, during the construction of the compaction pile, a construction monitoring device is arranged to monitor the compaction degree of the lime-soil compaction pile; The construction monitoring device comprises a compaction degree monitoring platform (1) for monitoring the compaction degree of the compaction pile, the compaction degree monitoring platform (1) is connected with a comparative analysis module (2) for data comparative analysis and processing, and the comparative analysis module (2) is connected with an indoor compaction simulation database (3) for simulating data storage; The compaction degree monitoring platform (1) is electrically connected with a controller (4) through a wireless communication module, the controller (4) is respectively electrically connected with a lime-soil compaction pile compaction degree detection mechanism (5) for detecting the compaction degree of the lime-soil compaction pile and a construction site alarm module (6) for data anomaly alarm; The construction site alarm module (6) is an audible and visual alarm (601); The controller (4) is electrically connected with a data storage module (7) for storing the detection data of the lime-soil compaction pile compaction degree detection mechanism (5); The lime-soil compaction pile compaction degree detection mechanism (5) comprises a rammer (501) for compaction pile construction, a pressurized cavity (502) for compaction degree detection is arranged on the upper surface of the rammer (501), hydraulic oil is arranged in the pressurized cavity (502), a sealing disc (503) for sealing the pressurized cavity (502) is threadedly connected to the inner wall of the pressurized cavity (502), a driving screw (504) having one surface rotationally connected to the surface of the sealing disc (503) through a bearing is rotationally connected to the inner bottom wall of the pressurized cavity (502) through a bearing, a speed reducer (505) is fixedly installed on the upper surface of the sealing disc (503), one end of the driving screw (504) penetrates through the sealing disc (503) and extends to the power output end of the speed reducer (505), and the one end of the driving screw (504) is fixedly connected to the power output end of the speed reducer (505), a driving motor (506) electrically connected to the controller (4) through a cable is fixedly installed on the surface of the speed reducer (505), the output shaft of the driving motor (506) is fixedly connected to the power input end of the speed reducer (505), a pressurizing piston (507) is threadedly connected to the surface of the driving screw (504), two symmetrically distributed stop limit rods (508) are slidingly connected to the surface of the pressurizing piston (507), one end of the stop limit rod (508) is threadedly connected to the inner bottom wall of the pressurized cavity (502), and the other end of the stop limit rod (508) penetrates through and extends to the upper surface of the sealing disc (503). The surface of the driving motor (506) is sleeved with a fixed connection pipe (509) fixedly connected with the surface of the rammer (501), the surface of the fixed connection pipe (509) is fixedly connected with a fixed sealing cover (510) with a conical surface fixedly connected with the surface of the rammer (501), the fixed sealing cover (510) and the fixed connection pipe (509) are fixedly connected with a hammer rod (511), the surface of the rammer (501) is provided with three detection cavities (512) arranged in a ring array with the axis of the pressurizing cavity (502) as the center, the inner bottom wall of the detection cavity (512) is provided with a detection hole (513), the inner wall of the detection hole (513) is slidably connected with a detection rod (514), one end of the detection rod (514) extends to the inner wall of the detection cavity (512), and the inner wall of the detection cavity (512) is slidably connected with a pressure-bearing piston (515), and the lower surface of the pressure-bearing piston (515) is fixedly connected with one end of the detection rod (514); The surface of the detection rod (514) is sleeved with a pressure-bearing spring (516), both ends of the pressure-bearing spring (516) are fixedly connected with the lower surface of the pressure-bearing piston (515) and the inner bottom wall of the detection cavity (512), the inner wall of the detection cavity (512) is threadedly connected with a sealing cover (517), the surface of the sealing cover (517) is fixedly connected with a pressurizing oil pipe (518), one end of the pressurizing oil pipe (518) penetrates and extends to the inner wall of the pressurizing cavity (502), the surface of the pressurizing oil pipe (518) is fixedly installed with a pressure sensor (519), and the pressure sensor (519) is electrically connected with the controller (4) through a cable; Step four, sampling verification, a certain number of sampling points are selected around the compaction pile, and the standard penetration test is usually used to obtain the compressive strength index of the soil; Step five, test detection, the dynamic penetration method or the static penetration method is used to obtain the compressive strength of the soil under the compaction pile, and multiple tests are performed to obtain the average value; Step six, comparison and evaluation, by comparing the compressive strength of the soil under the compaction pile and the compressive strength of the soil around the compaction pile, the effect of the compaction pile on the compaction of the soil is evaluated; Step seven, according to the evaluation result, appropriate adjustment measures are taken, the compaction degree is improved by changing the compaction parameters or increasing the number of compaction piles.

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