A monitoring platform for single pile vertical static load test

Abstract

The present invention provides a monitoring platform for a single pile vertical static load test, comprising: a process generation module, used for generating an initial personalized estimated loading thread of the single pile to be tested based on the original data of the single pile to be tested; a load application module, used for applying loads in stages to the single pile to be tested based on the initial personalized estimated loading thread; a settlement monitoring module, used for detecting the first real-time settlement of the single pile to be tested based on the initial personalized estimated loading thread while applying loads in stages, and obtaining settlement observation data of the corresponding loading process; a data sorting module, used for adjusting the initial personalized estimated loading thread based on the settlement observation data, obtaining a revised personalized estimated loading thread, and sending the revised personalized estimated loading thread to the load application module and the settlement monitoring module for iterative processing until a characteristic value of the vertical compressive bearing capacity of the single pile is determined; and used for automatically applying loads in stages to the single pile to be tested, monitoring the settlement, and automatically adjusting the personalized estimated loading thread.

Description

Technical Field

[0001] The invention relates to the technical field of load experiments, and in particular to a monitoring platform for a single pile vertical static load test. Background Art

[0002] The single pile vertical static load test involves uniformly transferring a vertical load to a building's foundation pile. By measuring the pile top settlement under different loads, the static load test's QS curve and auxiliary curves, such as S-lg(t), are derived. Parameters such as the characteristic value of the pile's vertical compressive bearing capacity are then deduced from these curves. The test loading method generally employs a slow, sustained load method, with each level of load applied in stages. After each level reaches relative stability, the next level is added until the test pile fails, followed by a gradual unloading of the load to zero.

[0003] However, in the process of graded loading and unloading, the next level of loading (unloading) operation needs to be carried out only when the settlement reaches a relatively stable level. Generally, in actual operation, it is necessary to observe and analyze the settlement before each loading (unloading). As a result, the entire single pile vertical static load test requires human real-time monitoring and participation, and the duration of the single pile vertical static load test is long, which will consume a lot of manpower costs. Therefore, a method is needed that can automatically adjust the loading duration and the start time of applying the next level of load to the tested single pile based on the latest settlement observation data.

[0004] Therefore, the present invention proposes a monitoring platform for a single pile vertical static load test. Summary of the Invention

[0005] The present invention provides a monitoring platform for a single pile vertical static load test, which is used to generate a personalized estimated loading thread based on the original data of the pile to be tested, and can automatically apply loads in stages to the single pile to be tested based on the initial personalized estimated loading thread and monitor the settlement of the single pile to be tested. The personalized estimated loading thread is automatically adjusted based on the settlement observation data obtained during the test, thereby realizing automatic adjustment of the loading duration of each level of the loading process of the single pile to be tested and the start time of applying the next level of load force, thereby improving the intelligence, efficiency and accuracy of the single pile vertical static load test.

[0006] The present invention provides a monitoring platform for a single pile vertical static load test, comprising:

[0007] A process generation module, used for generating an initial personalized estimated loading thread of the single pile to be tested based on the original data of the single pile to be tested;

[0008] A load application module, used to apply loads to the test pile in stages based on the initial personalized estimated loading thread;

[0009] The settlement monitoring module is used to detect the first real-time settlement of the single pile to be tested based on the initial personalized estimated loading thread while applying loads in stages, and obtain the settlement observation data of the corresponding loading process;

[0010] The data collation module is used to adjust the initial personalized estimated loading thread based on the settlement observation data, obtain the revised personalized estimated loading thread, and send it to the load application module and settlement monitoring module for iterative processing until the characteristic value of the vertical compressive bearing capacity of the single pile is determined.

[0011] Preferably, the process generation module includes:

[0012] A limit determination unit, configured to determine an estimated ultimate load of the single pile to be tested based on test requirements in original data of the single pile to be tested;

[0013] A loading determination unit, configured to determine an estimated total number of loading times and an estimated loading value for each loading process based on an estimated ultimate load and a preset loading ratio for each level;

[0014] A thread generation unit is used to generate a settlement observation thread for each loading process based on the total settlement observation period and the settlement observation interval time series of each loading process;

[0015] The final generation unit is used to obtain the initial personalized estimated loading thread of the single pile to be tested based on the settlement observation thread and the estimated loading value of the loading process with a preset total number of loading times.

[0016] Preferably, the final generation unit includes:

[0017] The thread connection subunit is used to connect the settlement observation threads of the loading process with a preset total number of loading times to obtain the total settlement observation thread;

[0018] The loading marking subunit is used to mark each level of loading value on the subthread corresponding to the corresponding process in the total settlement observation thread, and obtain the initial personalized estimated loading thread of the single pile to be tested.

[0019] Preferably, the load applying module comprises:

[0020] A single determination unit is used to determine the total settlement observation period and estimated loading value of each loading process based on the initial personalized estimated loading thread;

[0021] a data determination unit, configured to use the estimated load value as the load value applied to the single pile to be tested during the corresponding loading process, and use the total settlement observation period as the loading duration for applying the corresponding load value to the single pile to be tested during the corresponding loading process;

[0022] The graded loading unit is used to apply graded loads to the single pile to be tested based on the applied load value and loading duration of each loading process in the initial personalized estimated loading thread.

[0023] Preferably, the settlement monitoring module includes:

[0024] A thread determination unit, configured to determine a settlement observation thread for each loading process based on an initial personalized estimated loading thread;

[0025] A time determination unit is used to determine all settlement observation times in the corresponding loading process based on the settlement observation interval time sequence in the settlement observation thread;

[0026] The settlement observation unit is used to sequentially detect the first real-time settlement of the single pile to be tested at all settlement observation moments, and obtain the settlement observation data of the corresponding loading process.

[0027] Preferably, the data collating module includes:

[0028] A curve determining unit, configured to determine a graded load curve and a first real-time settlement curve based on an initial personalized estimated loading thread;

[0029] a data extraction unit, configured to align the graded load curve and the first real-time settlement curve to obtain an aligned curve combination, and extract alignment data from the aligned curve combination;

[0030] A curve fitting unit, configured to fit a first QS curve and a first S-lg(t) curve in real time based on the alignment data;

[0031] The result determination unit is used to adjust the initial personalized estimated loading thread based on the first QS curve and the first S-lg(t) curve to obtain a modified personalized estimated loading thread, and send it to the load application module and the settlement monitoring module for iterative processing until the characteristic value of the vertical compressive bearing capacity of the single pile is determined.

[0032] Preferably, the result determination unit includes:

[0033] A process generation subunit is used to adjust the initial personalized estimated loading thread based on the most recently obtained first QS curve and first S-lg(t) curve to obtain a modified personalized estimated loading thread, and send it to the load application module and the settlement monitoring module for iterative processing until the most recently obtained first QS curve and first S-lg(t) curve show loading stop characterization features, then generate a personalized unloading process based on the current personalized estimated loading thread;

[0034] A graded unloading subunit is used to perform graded unloading on the single pile to be tested based on a personalized unloading process, and record the graded unloading data and the second real-time settlement of the single pile to be tested;

[0035] A curve fitting subunit, for fitting a second QS curve and a second S-lg(t) curve based on the graded unloading data and the second real-time settlement;

[0036] The limit determination subunit is used to determine the characteristic value of the vertical compressive bearing capacity of the single pile to be tested based on the first QS curve and the first S-lg(t) curve and the second QS curve and the second S-lg(t) curve.

[0037] Preferably, the limit determination subunit includes:

[0038] A curve connecting end, used to connect the first QS curve and the second QS curve to obtain a total QS curve, and to connect the first S-lg(t) curve and the second S-lg(t) curve to obtain a total S-lg(t) curve;

[0039] A curve division end is used to divide the total S-lg(t) curve into multiple S-lg(t) curve segments based on multiple loading processes, align the starting points of all S-lg(t) curve segments, and obtain an S-lg(t) aligned curve segment combination;

[0040] The limit determination end is used to determine the characteristic value of the vertical compressive bearing capacity of the single pile to be tested based on the combination of the S-lg(t) alignment curve segments, the total QS curve, and the total S-lg(t) curve.

[0041] Preferably, the limit determination end includes:

[0042] The curve evaluation sub-terminal is used to calculate the evaluation value of the total S-lg(t) curve based on the combination of the S-lg(t) alignment curve segments, and determine whether the evaluation value is not less than the evaluation threshold. If so, the first limit load value is determined in the total QS curve based on the first limit load characterization feature. At the same time, the second limit load value is determined in the total S-lg(t) curve based on the second limit load characterization feature. Otherwise, an experimental data deviation warning signal is issued;

[0043] The limit determination sub-terminal is used to determine the single pile vertical compressive bearing capacity characteristic value of the single pile to be tested based on the first limit load value and the second limit load value.

[0044] Preferably, the method for determining the characteristic value of the vertical compressive bearing capacity of the single pile to be tested by the limit determination sub-end based on the first limit load value and the second limit load value includes:

[0045] The average of the first ultimate load value and the second ultimate load value is taken as the final ultimate load value of the single pile to be tested;

[0046] The quotient of the ultimate ultimate load value and the safety factor is taken as the characteristic value of the vertical compressive bearing capacity of the single pile to be tested.

[0047] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0048] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0050] Figure 1 Schematic diagram of a monitoring platform for a single pile vertical static load test according to an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of a process generation module in an embodiment of the present invention;

[0052] Figure 3 This is a schematic diagram of a final generation unit in an embodiment of the present invention;

[0053] Figure 4 This is a schematic diagram of a load application module in an embodiment of the present invention;

[0054] Figure 5 This is a schematic diagram of a settlement monitoring module in an embodiment of the present invention;

[0055] Figure 6 This is a schematic diagram of a data sorting module in an embodiment of the present invention;

[0056] Figure 7 Schematic diagram of a result determination unit in an embodiment of the present invention;

[0057] Figure 8 Schematic diagram of a limit determination subunit in an embodiment of the present invention;

[0058] Figure 9 Schematic diagram of a limit determination terminal in an embodiment of the present invention. DETAILED DESCRIPTION

[0059] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0060] Example 1:

[0061] The present invention provides a monitoring platform for a single pile vertical static load test. Figure 1 ,include:

[0062] A process generation module, used for generating an initial personalized estimated loading thread of the single pile to be tested based on the original data of the single pile to be tested;

[0063] A load application module, used to apply loads to the test pile in stages based on the initial personalized estimated loading thread;

[0064] The settlement monitoring module is used to detect the first real-time settlement of the single pile to be tested based on the initial personalized estimated loading thread while applying loads in stages, and obtain the settlement observation data of the corresponding loading process;

[0065] The data collation module is used to adjust the initial personalized estimated loading thread based on the settlement observation data, obtain the revised personalized estimated loading thread, and send it to the load application module and settlement monitoring module for iterative processing until the characteristic value of the vertical compressive bearing capacity of the single pile is determined.

[0066] In this embodiment, the single pile to be tested is a single pile whose vertical compressive bearing capacity characteristic value is measured through a single pile vertical static load test.

[0067] In this embodiment, the original data is data related to the single pile to be tested, such as pile length, pile diameter, and the estimated ultimate bearing capacity value of the pile and test requirements (for example, determining whether the single pile vertical compressive bearing capacity characteristic value of the single pile to be tested meets the requirements, etc.).

[0068] In this embodiment, the initial personalized estimated loading thread is a thread that is generated based on the original data of the single pile to be tested and represents the process of continuously loading the single pile to be tested during the single pile vertical static load test.

[0069] In this embodiment, the modified personalized estimated loading thread is a personalized estimated loading thread obtained after adjustment based on the latest obtained settlement observation data.

[0070] In this embodiment, the first real-time settlement is the total settlement of the single pile to be tested from the start of loading to the settlement observation time included in the personalized estimated loading thread.

[0071] In this embodiment, the settlement observation data is data including the settlement of the single pile to be tested from the start time of the corresponding loading process to each settlement observation time in the corresponding loading process.

[0072] In this embodiment, the initial personalized estimated loading thread is adjusted based on the settlement observation data to obtain a modified personalized estimated loading thread, which is:

[0073] When the latest settlement observation data reaches the relatively stable settlement standard, it is determined that the next level of load can be applied to the test pile. The relatively stable settlement standard is: the settlement per hour does not exceed 0.1 mm, and it occurs twice in a row (calculated from three consecutive observation values ​​within 1.5 hours). The starting time of this loading process to the time when it is determined that the next level of load can be applied to the test pile is taken as the latest total settlement observation period of the loading process. The settlement observation thread of the loading process is updated based on the latest total settlement observation period to obtain the corrected personalized estimated loading thread.

[0074] In this embodiment, the data is sent to the load application module and the settlement monitoring module for iterative processing, namely:

[0075] Instruct the load application module to continue applying loads in stages to the single pile to be tested based on the modified personalized estimated loading thread;

[0076] The settlement monitoring module detects the first real-time settlement of the single pile to be tested based on the modified personalized estimated loading thread while applying loads in stages, and obtains the settlement observation data of the corresponding loading process;

[0077] Based on the latest settlement observation data, the modified personalized estimated loading thread is further adjusted to obtain the latest modified personalized estimated loading thread, which is then sent to the load application module and the settlement monitoring module until the characteristic value of the vertical compressive bearing capacity of the single pile is determined, thus forming an iterative process.

[0078] In this embodiment, the characteristic value of the vertical compressive bearing capacity of a single pile is the value of the ultimate load that the tested single pile can withstand in the vertical direction determined by the single pile vertical static load test, which is determined based on the QS curve and S-lg(t) curve fitted based on all the latest settlement observation data.

[0079] The beneficial effects of the above technology are: generating a personalized estimated loading thread based on the original data of the pile to be tested, and automatically applying graded loads to the single pile to be tested and monitoring the settlement of the single pile to be tested based on the initial personalized estimated loading thread, and automatically adjusting the personalized estimated loading thread based on the settlement observation data obtained during the test, thereby realizing automatic adjustment of the loading duration of each level of loading process of the single pile to be tested and the start time of applying the next level of load force, thereby improving the intelligence, efficiency and accuracy of the single pile vertical static load test.

[0080] Example 2:

[0081] Based on Example 1, the process generation module refers to Figure 2 ,include:

[0082] A limit determination unit, configured to determine an estimated ultimate load of the single pile to be tested based on test requirements in original data of the single pile to be tested;

[0083] A loading determination unit, configured to determine an estimated total number of loading times and an estimated loading value for each loading process based on an estimated ultimate load and a preset loading ratio for each level;

[0084] A thread generation unit is used to generate a settlement observation thread for each loading process based on the total settlement observation period and the settlement observation interval time series of each loading process;

[0085] The final generation unit is used to obtain the initial personalized estimated loading thread of the single pile to be tested based on the settlement observation thread and the estimated loading value of the loading process with a preset total number of loading times.

[0086] In this embodiment, the test requirement is to determine whether the characteristic value of the vertical compressive bearing capacity of the single pile to be tested meets the requirements, that is, to determine whether the characteristic value of the vertical compressive bearing capacity of the single pile to be tested is greater than the characteristic threshold value of the vertical compressive bearing capacity of the single pile required for construction (for example, 200kN).

[0087] In this embodiment, based on the test requirements in the original data of the single pile to be tested, the estimated ultimate load of the single pile to be tested is determined, namely:

[0088] The characteristic threshold value of the vertical compressive bearing capacity of a single pile in the test requirements is used as the estimated ultimate load.

[0089] In this embodiment, the preset loading ratio of each level is between 1 / 10 and 1 / 15, that is, the ratio of the preset load value (load force) of each level relative to the increase of the load value of the previous level to the estimated ultimate load.

[0090] In this embodiment, the estimated total number of loading times is the total number of loading times in the single pile vertical static load test determined based on the estimated ultimate load and the preset loading ratio for each level. The estimated total number of loading times is equal to the value obtained by rounding up the quotient of the estimated ultimate load and the preset loading ratio for each level.

[0091] In this embodiment, the estimated loading value is the load value applied to the single pile to be tested in each loading process. For example, the first level can be the product of twice the estimated ultimate load and the preset loading ratio per level. The estimated loading value of each subsequent loading process is increased by the product of the estimated ultimate load and the preset loading ratio per level relative to the estimated loading value of the previous loading process.

[0092] In this embodiment, the total settlement observation period is the total duration of observing the real-time settlement of the single pile to be tested during a single loading process, and is also the duration of applying load to the single pile to be tested during a single loading process.

[0093] In this embodiment, the settlement observation interval time sequence is set according to a preset setting. For example, after each level of loading, the measurement is taken every 5, 10, and 15 minutes, and then every 15 minutes. After one hour, it is read every 30 minutes. The settlement observation interval sequence is: 5min, 10min, 15min, 15min, 15min, 30min, 30min, ...

[0094] In this embodiment, the settlement observation thread is a thread that represents all settlement observation time intervals of the corresponding loading process and is generated based on the total settlement observation period and settlement observation interval time series of each loading process.

[0095] The beneficial effects of the above technology are: determining the estimated ultimate load based on the test requirements of the single pile to be tested, and determining the estimated total number of loadings and the estimated loading value of each loading process based on the estimated ultimate load and the preset loading ratio of each level, and generating the settlement observation thread of each loading process based on the total settlement observation period and the settlement observation interval time series of each loading process, thereby realizing the settlement observation thread and the estimated loading value of the loading process based on the preset total number of loadings, obtaining the personalized estimated loading thread of the single pile to be tested, and realizing the automatic generation of the initial personalized estimated loading thread based on the test requirements and the initial settings of the test.

[0096] Example 3:

[0097] Based on Example 2, the final generated unit, reference Figure 3 ,include:

[0098] The thread connection subunit is used to connect the settlement observation threads of the loading process with a preset total number of loading times to obtain the total settlement observation thread;

[0099] The loading marking subunit is used to mark each level of loading value on the subthread corresponding to the corresponding process in the total settlement observation thread, and obtain the initial personalized estimated loading thread of the single pile to be tested.

[0100] In this embodiment, the total settlement observation thread is a thread obtained by connecting the settlement observation threads of the loading process with a preset total number of loading times.

[0101] In this embodiment, the sub-thread is a partial thread corresponding to each loading process in the total settlement observation thread.

[0102] The beneficial effects of the above technology are: connecting the settlement observation threads of the loading process with a preset total number of loading times to obtain the total settlement observation thread, marking each level of loading value in the sub-thread corresponding to the corresponding process in the total settlement observation thread, obtaining the personalized estimated loading thread of the single pile to be tested, and then automatically generating a thread containing detailed data such as the settlement observation interval time and estimated loading value of each loading process.

[0103] Example 4:

[0104] Based on Example 2, the load application module, refer to Figure 4 ,include:

[0105] A single determination unit is used to determine the total settlement observation period and estimated loading value of each loading process based on the initial personalized estimated loading thread;

[0106] a data determination unit, configured to use the estimated load value as the load value applied to the single pile to be tested during the corresponding loading process, and use the total settlement observation period as the loading duration for applying the corresponding load value to the single pile to be tested during the corresponding loading process;

[0107] The graded loading unit is used to apply graded loads to the single pile to be tested based on the applied load value and loading duration of each loading process in the initial personalized estimated loading thread.

[0108] In this embodiment, the applied load value is the load force (value) applied to the single pile to be tested during the corresponding loading process.

[0109] In this embodiment, the loading duration is the duration of applying the corresponding load force to the single pile to be tested during the corresponding loading process.

[0110] The beneficial effects of the above technology are: it realizes automatic graded load application on the single pile to be tested based on the automatically generated personalized estimated loading thread, improves the intelligence level of the single pile vertical static load test, and reduces labor costs and calculation workload.

[0111] Example 5:

[0112] On the basis of Example 1, the settlement monitoring module, refer to Figure 5 ,include:

[0113] A thread determination unit, configured to determine a settlement observation thread for each loading process based on an initial personalized estimated loading thread;

[0114] A time determination unit is used to determine all settlement observation times in the corresponding loading process based on the settlement observation interval time sequence in the settlement observation thread;

[0115] The settlement observation unit is used to sequentially detect the first real-time settlement of the single pile to be tested at all settlement observation moments, and obtain the settlement observation data of the corresponding loading process.

[0116] In this embodiment, the settlement observation times are 5 minutes, 15 minutes, 30 minutes, 45 minutes, 60 minutes, 90 minutes, 120 minutes, ..., 1440 minutes after the start of the current loading process (when the total settlement observation period is 24 hours).

[0117] The beneficial effects of the above technology are: determining the settlement observation thread of each loading process based on the initial personalized estimated loading thread, determining all settlement observation moments in the corresponding loading process based on the settlement observation interval time series in the settlement observation thread, and sorting and summarizing the first real-time settlement of the single pile to be tested at all settlement observation moments to obtain all settlement observation data in the corresponding loading process.

[0118] Example 6:

[0119] Based on Example 1, the data sorting module, refer to Figure 6 ,include:

[0120] A curve determining unit, configured to determine a graded load curve and a first real-time settlement curve based on an initial personalized estimated loading thread;

[0121] a data extraction unit, configured to align the graded load curve and the first real-time settlement curve to obtain an aligned curve combination, and extract alignment data from the aligned curve combination;

[0122] A curve fitting unit, configured to fit a first QS curve and a first S-lg(t) curve in real time based on the alignment data;

[0123] The result determination unit is used to adjust the initial personalized estimated loading thread based on the first QS curve and the first S-lg(t) curve to obtain a modified personalized estimated loading thread, and send it to the load application module and the settlement monitoring module for iterative processing until the characteristic value of the vertical compressive bearing capacity of the single pile is determined.

[0124] In this embodiment, the graded load curve is a curve that includes the estimated load value and loading duration of each loading process in the single pile vertical static load test, that is, the curve is obtained by taking the estimated load value in each loading process as the amplitude of the graded load curve within the corresponding loading duration.

[0125] In this embodiment, the first real-time settlement curve is a curve obtained by fitting the first real-time settlements obtained in sequence in the single pile vertical static load test in a time sequence.

[0126] In this embodiment, the aligned curve combination is a curve combination obtained by aligning the graded load curve and the first real-time settlement curve.

[0127] In this embodiment, the alignment data is the load value applied to the single pile to be tested corresponding to each first real-time settlement amount extracted from the alignment curve combination. The load value corresponding to each first real-time settlement amount is taken as a set of alignment data, and multiple sets of alignment data are obtained.

[0128] In this embodiment, the first QS curve is the QS curve obtained in real time during the loading process of the single pile to be tested, that is, the first real-time settlement in the alignment data is used as the vertical coordinate (that is, the S axis in the QS curve) and the load value in the alignment data is used as the horizontal coordinate (that is, the Q axis in the QS curve) to determine the multiple points, and the curve is obtained by sorting and fitting the multiple points based on the order of the determined alignment data.

[0129] In this embodiment, the first S-lg(t) curve is the S-lg(t) curve obtained in real time during the loading process of the single pile to be tested, that is, the first real-time settlement in the alignment data is used as the vertical coordinate and the lg(t) value at the time t when the first real-time settlement is obtained is used as the horizontal coordinate. The multiple points are determined and the curve is obtained by sorting and fitting the multiple points based on the order of the determined alignment data.

[0130] The beneficial effects of the above technology are: realizing the extraction of alignment data from the graded load curve and the first real-time settlement curve determined based on the personalized estimated loading thread, and fitting the QS curve and S-lg(t) curve of the single pile to be tested during the loading process based on the alignment data, and further adjusting the current personalized estimated loading thread based on the first QS curve and the first S-lg(t) curve until the characteristic value of the vertical compressive bearing capacity of the single pile is determined, realizing automatic adjustment of the personalized estimated loading thread, and then realizing automatic adjustment of the loading duration of each level of loading process of the single pile to be tested and the start time of applying the next level of load force, thereby improving the intelligence, efficiency and accuracy of the single pile vertical static load test.

[0131] Example 7:

[0132] On the basis of Example 6, the result determination unit, reference Figure 7 ,include:

[0133] A process generation subunit is used to adjust the initial personalized estimated loading thread based on the most recently obtained first QS curve and first S-lg(t) curve to obtain a modified personalized estimated loading thread, and send it to the load application module and the settlement monitoring module for iterative processing until the most recently obtained first QS curve and first S-lg(t) curve show loading stop characterization features, then generate a personalized unloading process based on the current personalized estimated loading thread;

[0134] A graded unloading subunit is used to perform graded unloading on the single pile to be tested based on a personalized unloading process, and record the graded unloading data and the second real-time settlement of the single pile to be tested;

[0135] A curve fitting subunit, for fitting a second QS curve and a second S-lg(t) curve based on the graded unloading data and the second real-time settlement;

[0136] The limit determination subunit is used to determine the characteristic value of the vertical compressive bearing capacity of the single pile to be tested based on the first QS curve and the first S-lg(t) curve and the second QS curve and the second S-lg(t) curve.

[0137] In this embodiment, the personalized estimated loading thread is adjusted based on the newly obtained first QS curve and the first S-lg(t) curve as follows:

[0138] When the newly obtained first QS curve and the first S-lg(t) curve show that the settlement of the single pile to be tested reaches the relatively stable settlement standard, it is determined that the next level of load can be applied to the single pile to be tested, where the relatively stable settlement standard is: the settlement per hour does not exceed 0.1 mm, and it occurs twice consecutively (calculated from three consecutive observation values ​​within 1.5 hours). The time from the start of this loading process to the time when it is determined that the next level of load can be applied to the single pile to be tested is taken as the latest total settlement observation period of the loading process. The settlement observation thread of the loading process is updated based on the latest total settlement observation period. The adjusted personalized estimated loading thread is obtained based on the updated settlement observation thread of the loading process, thereby realizing the adjustment of the current personalized estimated loading thread.

[0139] In this embodiment, the newly obtained first QS curve and the first S-lg(t) curve show the characteristic feature of loading cessation, that is, the newly obtained first QS curve and the first S-lg(t) curve show that the settlement during this loading process is 5 times the settlement under the previous level of load, or the settlement during this loading process is greater than 2 times the settlement under the previous level of load, and has not reached relative stability after 24 hours.

[0140] In this embodiment, a personalized unloading process is generated based on the current personalized estimated loading thread, that is: the current applied load value applied to the single pile to be tested in the current personalized estimated loading thread corresponding to the loading stop characterization feature when the first QS curve and the first S-lg(t) curve appear is used as the unloading starting value. Starting from the unloading starting value, the unloading value of each level in the unloading process is twice the loading value of each level. After each level of unloading, the residual settlement is measured and read once every 15 minutes. After reading twice, it is read again after 30 minutes to unload the next level of load. After all unloading, it is read again after 3 to 4 hours. The thread generating the characterization of the above process is the personalized unloading process.

[0141] In this embodiment, the graded unloading data is data including the load value after each unloading in the graded unloading process of the single pile to be tested and the duration corresponding to the load value.

[0142] In this embodiment, the second real-time settlement amount is the real-time settlement amount of the single pile to be tested detected during the process of graded unloading of the single pile to be tested based on the personalized unloading process.

[0143] In this embodiment, a second QS curve and a second S-lg(t) curve are fitted based on the graded unloading data and the second real-time settlement, namely:

[0144] Time-series alignment is performed on the graded unloading data and the second real-time settlement data to obtain time-series aligned data;

[0145] The second real-time settlement in the time-series alignment data is used as the ordinate, and the load value applied to the test pile after the graded unloading in the time-series alignment data is used as the abscissa to obtain the corresponding point. All points are sorted and fitted according to the time sequence of the time-series alignment data to obtain the second QS curve;

[0146] The corresponding points are obtained by taking the second real-time sedimentation amount in the time-series alignment data as the vertical coordinate and the lg(t) value of the acquisition time t of each second real-time sedimentation amount in the time-series alignment data as the horizontal coordinate. All points are sorted and fitted according to the time sequence of the time-series alignment data to obtain the second S-lg(t) curve.

[0147] The beneficial effects of the above technology are: realizing adjustment of the personalized estimated loading thread based on the latest obtained first QS curve and the first S-lg(t) curve, until the latest obtained first QS curve and the first S-lg(t) curve show the loading stop characterization feature, then generating a personalized unloading process based on the current personalized estimated loading thread, that is, realizing automatic generation of a personalized unloading process of the single pile vertical static load test for the unloading process of the single pile to be tested, and automatically recording the graded unloading data and the second real-time settlement of the single pile to be tested during the unloading process, thereby generating the second QS curve and the second S-lg(t) curve during the unloading process, and automatically adjusting the personalized estimated loading thread based on the first QS curve and the first S-lg(t) curve as well as the second QS curve and the second S-lg(t) curve, thereby realizing automatic adjustment of the loading duration of each level of the loading process of the single pile to be tested and the start time of applying the next level of load force, thereby improving the intelligence, efficiency and accuracy of the single pile vertical static load test.

[0148] Example 8:

[0149] On the basis of Example 7, the limit determination subunit, refer to Figure 8 ,include:

[0150] A curve connecting end, used to connect the first QS curve and the second QS curve to obtain a total QS curve, and to connect the first S-lg(t) curve and the second S-lg(t) curve to obtain a total S-lg(t) curve;

[0151] The curve division end is used to divide the total S-lg(t) curve into multiple S-lg(t) curve segments based on multiple loading processes, align the starting points of all S-lg(t) curve segments (that is, align the starting points of all S-lg(t) curve segments in time sequence), and obtain a combination of S-lg(t) aligned curve segments;

[0152] The limit determination end is used to determine the characteristic value of the vertical compressive bearing capacity of the single pile to be tested based on the combination of the S-lg(t) alignment curve segments, the total QS curve, and the total S-lg(t) curve.

[0153] In this embodiment, the total QS curve is a curve obtained by connecting the first QS curve and the second QS curve.

[0154] In this embodiment, the total S-lg(t) curve is a curve obtained by connecting the first S-lg(t) curve and the second S-lg(t) curve.

[0155] In this embodiment, the S-lg(t) curve segment is the S-lg(t) curve segment corresponding to a single loading process obtained by dividing the total S-lg(t) curve based on multiple loading processes.

[0156] In this embodiment, the S-lg(t) aligned curve segment combination is a curve segment set obtained by performing time-series alignment on all S-lg(t) curve segments.

[0157] The beneficial effects of the above technology are: based on the first QS curve and the second QS curve and the first S-lg(t) curve and the second S-lg(t) curve in the loading process and the unloading process in the single pile vertical static load test, the S-lg(t) aligned curve segment combination is obtained after connecting, dividing, and aligning the starting points, and then the data processing of the first QS curve and the second QS curve and the first S-lg(t) curve and the second S-lg(t) curve is realized, which is convenient for the subsequent determination of the accurate single pile vertical compressive bearing capacity characteristic value of the single pile to be tested.

[0158] Example 9:

[0159] Based on Example 8, the limit determination end, refer to Figure 9 ,include:

[0160] The curve evaluation sub-terminal is used to calculate the evaluation value of the total S-lg(t) curve based on the combination of the S-lg(t) alignment curve segments, and determine whether the evaluation value is not less than the evaluation threshold. If so, the first limit load value is determined in the total QS curve based on the first limit load characterization feature. At the same time, the second limit load value is determined in the total S-lg(t) curve based on the second limit load characterization feature. Otherwise, an experimental data deviation warning signal is issued;

[0161] The limit determination sub-terminal is used to determine the single pile vertical compressive bearing capacity characteristic value of the single pile to be tested based on the first limit load value and the second limit load value.

[0162] In this embodiment, the evaluation value of the total S-lg(t) curve is calculated based on the combination of S-lg(t) alignment curve segments, including:

[0163] Determine the settlement corresponding to the lg(t) value at each time t in each S-lg(t) curve segment in the S-lg(t) aligned curve segment combination, and determine the first derivative value of each S-lg(t) curve segment in the S-lg(t) aligned curve segment combination at the lg(t) value at time t of the corresponding S-lg(t) curve segment. Based on the settlement corresponding to the lg(t) value at each time t in each S-lg(t) curve segment in the S-lg(t) aligned curve segment combination and the first derivative value at the lg(t) value at time t of the corresponding S-lg(t) curve segment, calculate the evaluation value of the total S-lg(t) curve:

[0164]

[0165] Where P is the evaluation value of the total S-lg(t) curve, i is the i-th S-lg(t) curve segment in the S-lg(t) aligned curve segment combination, n is the total number of S-lg(t) curve segments contained in the S-lg(t) aligned curve segment combination, t is the time t corresponding to each abscissa value (i.e., each lg(t) value) in the S-lg(t) curve segment, T is the value range of t in the abscissa value lg(t) of the S-lg(t) curve segment, S (i+1)·lg(t) is the settlement corresponding to the lg(t) value of the (i+1)th S-lg(t) curve segment at time t in the S-lg(t) alignment curve segment combination, S i·lg(t) is the settlement corresponding to the lg(t) value of the i-th S-lg(t) curve segment at time t in the S-lg(t) alignment curve segment combination, S ( ′ i+1)·lg(t) is the first derivative value of the (i+1)th S-lg(t) curve segment in the S-lg(t) aligned curve segment combination at the lg(t) value of the (i+1)th S-lg(t) curve segment at time t, S i ′ ·lg(t) is the first derivative value of the i-th S-lg(t) curve segment in the S-lg(t) aligned curve segment combination at the lg(t) value of the i-th S-lg(t) curve segment at time t;

[0166] Based on the above formula, the evaluation value of the data reliability of the total S-lg(t) curve and the total QS curve can be obtained from the perspective of the similarity between the S-lg(t) curve segments corresponding to all loading processes in the S-lg(t) alignment curve segment combination and the similarity of the changing rate of the settlement during the loading process. The higher the evaluation value, the more reliable the data, and vice versa.

[0167] In this embodiment, the evaluation threshold is the minimum evaluation value that needs to be met when no experimental data deviation warning signal is required to be issued.

[0168] In this embodiment, the first limit load value is determined in the total QS curve based on the first limit load characterization feature, wherein the first limit load characterization feature is: the total QS curve of the gradual variation type can generally take the load value corresponding to S (settlement) = 40~60mm as the first limit load value; for a large-diameter single pile to be tested, the load value corresponding to S (settlement) = 0.03~0.06D (D is the diameter of the single pile to be tested, the large pile diameter takes the lower value, and the small pile diameter takes the higher value) can be taken as the first limit load value; for a slender pile (d>80), the load value corresponding to S = 60~80mm can be taken as the first limit load value.

[0169] In this embodiment, the second limit load value is determined in the total S-lg(t) curve based on the second limit load characterization feature, wherein the second limit load characterization feature is: the previous level load value at which the tail of the total S-lg(t) curve shows an obvious downward bend is used as the second limit load value.

[0170] In this embodiment, the experimental data deviation reminder signal is used to remind the user that the error of the currently acquired test data (first real-time settlement, second real-time settlement, applied load value, etc.) is too large and the test data needs to be re-acquired.

[0171] The beneficial effects of the above technology are: realizing the evaluation value of the total S-lg(t) curve calculated based on the combination of S-lg(t) alignment curve segments to judge whether the test data obtained during the single pile vertical static load test meets the requirements, thereby ensuring the accuracy of the test data, and also ensuring the accuracy of the single pile vertical compressive bearing capacity characteristic value of the single pile to be tested that is finally determined, and determining the single pile vertical compressive bearing capacity characteristic value of the single pile to be tested based on the first ultimate load value determined in the total QS curve and the second ultimate load value determined in the total S-lg(t) curve, further ensuring the accuracy of the single pile vertical compressive bearing capacity characteristic value of the single pile to be tested that is finally determined.

[0172] Example 10:

[0173] Based on Example 9, a method for determining, by a limit determination sub-terminal, a characteristic value of the vertical compressive bearing capacity of a single pile to be tested based on a first limit load value and a second limit load value includes:

[0174] The average of the first ultimate load value and the second ultimate load value is taken as the final ultimate load value of the single pile to be tested;

[0175] The quotient of the ultimate ultimate load value and the safety factor is taken as the characteristic value of the vertical compressive bearing capacity of the single pile to be tested.

[0176] In this embodiment, the final limit load value is the average value of the first limit load value and the second limit load value.

[0177] In this embodiment, the safety factor is 2.0.

[0178] The beneficial effect of the above technology is: based on the first ultimate load value determined in the total QS curve and the second ultimate load value determined in the total S-lg(t) curve, the characteristic value of the vertical compressive bearing capacity of the single pile to be tested is determined, which further ensures the accuracy of the characteristic value of the vertical compressive bearing capacity of the single pile to be tested that is finally determined.

[0179] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A monitoring platform for a single pile vertical static load test, characterized in that: include: A process generation module, used for generating an initial personalized estimated loading thread of the single pile to be tested based on the original data of the single pile to be tested; The initial personalized estimated loading thread is a thread that represents the process of continuously loading the single pile to be tested during the single pile vertical static load test, generated based on the original data of the single pile to be tested. A load application module, used to apply loads to the test pile in stages based on the initial personalized estimated loading thread; The settlement monitoring module is used to detect the first real-time settlement of the single pile to be tested based on the initial personalized estimated loading thread while applying loads in stages, and obtain the settlement observation data of the corresponding loading process; The data consolidation module is used to adjust the initial personalized estimated loading thread based on the settlement observation data to obtain a revised personalized estimated loading thread, and send it to the load application module and settlement monitoring module for iterative processing until the characteristic value of the vertical compressive bearing capacity of the single pile is determined; Among them, the modified personalized estimated loading thread is the personalized estimated loading thread obtained after adjustment based on the latest settlement observation data.

2. A monitoring platform for a single pile vertical static load test according to claim 1, characterized in that: Process generation module, including: A limit determination unit, configured to determine an estimated ultimate load of the single pile to be tested based on test requirements in original data of the single pile to be tested; A loading determination unit, configured to determine an estimated total number of loading times and an estimated loading value for each loading process based on an estimated ultimate load and a preset loading ratio for each level; A thread generation unit is used to generate a settlement observation thread for each loading process based on the total settlement observation period and the settlement observation interval time series of each loading process; The final generation unit is used to obtain the initial personalized estimated loading thread of the single pile to be tested based on the settlement observation thread and the estimated loading value of the loading process with a preset total number of loading times.

3. A monitoring platform for a single pile vertical static load test according to claim 2, characterized in that: The final generation unit includes: The thread connection subunit is used to connect the settlement observation threads of the loading process with a preset total number of loading times to obtain the total settlement observation thread; The loading marking subunit is used to mark each level of loading value on the subthread corresponding to the corresponding process in the total settlement observation thread, and obtain the initial personalized estimated loading thread of the single pile to be tested.

4. A monitoring platform for a single pile vertical static load test according to claim 2, characterized in that: Load application module, including: A single determination unit is used to determine the total settlement observation period and estimated loading value of each loading process based on the initial personalized estimated loading thread; a data determination unit, configured to use the estimated load value as the load value applied to the single pile to be tested during the corresponding loading process, and use the total settlement observation period as the loading duration for applying the corresponding load value to the single pile to be tested during the corresponding loading process; The graded loading unit is used to apply graded loads to the single pile to be tested based on the applied load value and loading duration of each loading process in the initial personalized estimated loading thread.

5. The monitoring platform for a single pile vertical static load test according to claim 1, characterized in that: Settlement monitoring module, including: A thread determination unit, configured to determine a settlement observation thread for each loading process based on an initial personalized estimated loading thread; A time determination unit is used to determine all settlement observation times in the corresponding loading process based on the settlement observation interval time sequence in the settlement observation thread; The settlement observation unit is used to sequentially detect the first real-time settlement of the single pile to be tested at all settlement observation moments, and obtain the settlement observation data of the corresponding loading process.

6. A monitoring platform for a single pile vertical static load test according to claim 1, characterized in that: Data sorting module, including: A curve determining unit, configured to determine a graded load curve and a first real-time settlement curve based on an initial personalized estimated loading thread; a data extraction unit, configured to align the graded load curve and the first real-time settlement curve to obtain an aligned curve combination, and extract alignment data from the aligned curve combination; A curve fitting unit, configured to fit a first QS curve and a first S-lg(t) curve in real time based on the alignment data; The result determination unit is used to adjust the initial personalized estimated loading thread based on the first QS curve and the first S-lg(t) curve to obtain a modified personalized estimated loading thread, and send it to the load application module and the settlement monitoring module for iterative processing until the characteristic value of the vertical compressive bearing capacity of the single pile is determined.

7. A monitoring platform for a single pile vertical static load test according to claim 6, characterized in that: Result determination unit, including: A process generation subunit is used to adjust the initial personalized estimated loading thread based on the most recently obtained first QS curve and first S-lg(t) curve to obtain a modified personalized estimated loading thread, and send it to the load application module and the settlement monitoring module for iterative processing until the most recently obtained first QS curve and first S-lg(t) curve show loading stop characterization features, then generate a personalized unloading process based on the current personalized estimated loading thread; A graded unloading subunit is used to perform graded unloading on the single pile to be tested based on a personalized unloading process, and record the graded unloading data and the second real-time settlement of the single pile to be tested; A curve fitting subunit, for fitting a second QS curve and a second S-lg(t) curve based on the graded unloading data and the second real-time settlement; The limit determination subunit is used to determine the characteristic value of the vertical compressive bearing capacity of the single pile to be tested based on the first QS curve and the first S-lg(t) curve and the second QS curve and the second S-lg(t) curve.

8. A monitoring platform for a single pile vertical static load test according to claim 7, characterized in that: The limit determination subunit includes: A curve connecting end, used to connect the first QS curve and the second QS curve to obtain a total QS curve, and to connect the first S-lg(t) curve and the second S-lg(t) curve to obtain a total S-lg(t) curve; A curve division end is used to divide the total S-lg(t) curve into multiple S-lg(t) curve segments based on multiple loading processes, align the starting points of all S-lg(t) curve segments, and obtain an S-lg(t) aligned curve segment combination; The limit determination end is used to determine the characteristic value of the vertical compressive bearing capacity of the single pile to be tested based on the combination of the S-lg(t) alignment curve segments, the total QS curve, and the total S-lg(t) curve.

9. A monitoring platform for a single pile vertical static load test according to claim 8, characterized in that: The limit determination end includes: The curve evaluation sub-terminal is used to calculate the evaluation value of the total S-lg(t) curve based on the combination of the S-lg(t) alignment curve segments, and determine whether the evaluation value is not less than the evaluation threshold. If so, the first limit load value is determined in the total QS curve based on the first limit load characterization feature. At the same time, the second limit load value is determined in the total S-lg(t) curve based on the second limit load characterization feature. Otherwise, an experimental data deviation warning signal is issued; The limit determination sub-terminal is used to determine the single pile vertical compressive bearing capacity characteristic value of the single pile to be tested based on the first limit load value and the second limit load value.

10. A monitoring platform for a single pile vertical static load test according to claim 9, characterized in that: The method for determining the characteristic value of the vertical compressive bearing capacity of the single pile to be tested by the limit determination sub-terminal based on the first limit load value and the second limit load value includes: The average of the first ultimate load value and the second ultimate load value is taken as the final ultimate load value of the single pile to be tested; The quotient of the ultimate ultimate load value and the safety factor is taken as the characteristic value of the vertical compressive bearing capacity of the single pile to be tested.

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