CN-121977926-A - Graded test method and system for bearing strength of drain board

CN121977926ACN 121977926 ACN121977926 ACN 121977926ACN-121977926-A

Abstract

The invention discloses a grading test method and system for the bearing strength of a drain board, wherein the method comprises the steps of sampling, cutting and preprocessing the drain board to be tested, standing the preprocessed drain board sample in a standard environment for a first preset time period to obtain a prepared sample, placing the prepared sample on loading equipment, carrying out a bearing test in a grading loading mode, keeping the pressure stable for a second preset time period after each grade of loading, synchronously monitoring the vertical deformation of the drain board sample under the pressure of each grade in real time during the grading loading test, and dividing the bearing grade of the drain board sample according to preset deformation and strength double indexes based on the vertical deformation and the ultimate bearing strength data obtained by continuously loading the drain board sample after grading loading. The problems of single testing method, incomplete result and unreasonable grading are solved, reliable basis is provided for engineering selection, and a complete, systematic and repeatable grading testing scheme for the bearing strength of the drain board is provided.

Inventors

Fu Hengzuo
Geng Zhumei

Assignees

江苏三鼎软基材料有限公司

Dates

Publication Date: 20260505
Application Date: 20260310

Claims (10)

1. The grading test method for the bearing strength of the drain board is characterized by comprising the following steps of: Sampling, cutting and preprocessing a drain board to be tested, and standing a preprocessed drain board sample in a standard environment for a first preset time period to obtain a prepared sample; Placing the prepared sample on loading equipment, and carrying out pressure-bearing test in a grading loading mode, wherein the pressure is kept stable for a second preset time period after each stage of loading; In the step loading test process, synchronously monitoring the vertical deformation of the drainage plate sample under each level of pressure in real time; and dividing the bearing grade of the drainage plate sample according to preset deformation and strength double indexes based on the vertical deformation and the ultimate bearing strength data obtained by continuously loading the drainage plate sample after the graded loading.
2. The method for testing the bearing strength of the drainage plate according to claim 1, wherein the steps of sampling, cutting and preprocessing the drainage plate to be tested, and standing the preprocessed drainage plate sample in a standard environment for a first preset time period to obtain a prepared sample comprise the steps of: Selecting a preset number of drain boards with the same specification from the same batch of products of the drain boards to be tested as an original test material; Cutting the original test material into a test sample with a preset size by adopting cutting equipment, and removing impurities and pollutants on the surface of the cut test sample; and placing the pretreated test sample in a standard environment condition, standing for a first preset time period to enable the sample to reach a performance stable state so as to obtain a prepared sample.
3. The method for graded testing of load bearing strength of a drain board according to claim 2, further comprising, during cutting of the original test material into test samples of a predetermined size using a cutting device: detecting the flatness and the integrity of a cutting edge of the original test material in the cutting process of the cutting equipment on line; cutting parameters of the cutting equipment are adjusted in real time according to the flatness and the integrity of the cutting edge so as to ensure the dimensional accuracy; Setting two temperature measuring points according to respective dividing parameters of a preheating area in front of the cutting point and a cut area behind the cutting point; And carrying out temperature monitoring on each temperature measuring point through preset monitoring frequency, and triggering temperature early warning when the temperature of any temperature measuring point is monitored to exceed a preset threshold value.
4. The method for testing the bearing strength of the drain board according to claim 1, wherein the step of placing the prepared sample on a loading device and carrying out the bearing test in a step loading manner, and maintaining the pressure stable for a second preset period after each step of loading comprises: The prepared test sample of the drain board is correctly arranged on a test platform of the loading equipment, and the position of the test sample of the drain board is adjusted to align the center of the test sample with the geometric center of a pressure head of the loading equipment; applying pressure step by step according to a preset pressure grade sequence, and keeping the pressure stable for a second preset time period after loading of each stage is completed; And recording the pressure value in the test sample of the drain board in the loading process of each stage and the response data of the sample in real time.
5. The grading test method for the bearing strength of the drain board according to claim 4, wherein the step-by-step application of pressure according to a preset pressure grade sequence, and the step of pressure stability control is further included in the process of recording the pressure value in the drain board test sample and the response data of the sample in each stage of loading process in real time, specifically: monitoring pressure sensor data in real time, and adjusting the opening of the servo valve through a closed-loop control algorithm when the pressure deviates from a set value; Maintaining pressure stability by adopting a PID control algorithm, wherein the control period is not more than 100 milliseconds, recording the actual value of the pressure every 10 seconds during the pressure maintaining period, and calculating the standard deviation of pressure fluctuation; Triggering an alarm and automatically compensating when the standard deviation of the pressure fluctuation exceeds an allowable range; The method also comprises a loading interrupt judging step, specifically comprising the following steps: During each pressure maintaining stage, sample deformation data are monitored in real time, and when deformation rate mutation exceeding a threshold value is detected, the drain board test sample is judged to be about to fail; when the deformation reaches a preset critical value or the drain board test sample is damaged visually, immediately stopping subsequent loading of the drain board test sample and recording the pressure level, deformation data and stopping reason when the loading is interrupted.
6. The method for testing the bearing strength of the drain board according to claim 1, wherein the step of synchronously monitoring the vertical deformation of the drain board sample under each level of pressure in real time during the step loading test comprises the following steps: the vertical deformation monitoring device is arranged on the loading equipment, and the measuring axis of the vertical deformation monitoring device is ensured to be parallel to the loading direction; in the process of applying, maintaining pressure and unloading each stage of pressure of the stage loading, synchronously acquiring pressure data and corresponding vertical deformation data in real time through a vertical deformation monitoring device; and processing the collected pressure data and the corresponding vertical deformation data, calculating the characteristic deformation under each level of pressure, and establishing a corresponding relation with the pressure value.
7. The method for testing the load bearing strength of a drain board according to claim 6, further comprising: analyzing a change curve of the deformation rate in real time, and automatically identifying an inflection point of deformation acceleration; when the deformation amount is recognized to reach 5% of the initial thickness of the sample, recording the pressure value at the moment as the elastic deformation critical pressure; When a sudden increase in the deformation rate during the constant pressure dwell period is identified, a potential plastic deformation initiation point is marked.
8. The method for testing the bearing strength of the drainage plate according to claim 1, wherein the classifying the bearing grades of the drainage plate samples according to the preset deformation and strength double indexes based on the vertical deformation and the limit bearing strength data obtained by continuously loading the drainage plate samples after the classified loading comprises the following steps: Acquiring vertical deformation data of a drain board sample under each stage of pressure in a stage loading test, and continuously loading the drain board sample after stage loading to obtain ultimate bearing strength data; calculating deformation characteristic indexes based on the vertical deformation data, and determining strength grade indexes based on the ultimate bearing strength data; dividing the drainage plate sample into corresponding bearing grades according to the combination relation of the preset deformation characteristic threshold and the strength grade threshold; An assessment report is generated that includes the load bearing rating and the applicable engineering scenario.
9. The method for testing the load bearing strength of the drain board according to claim 8, further comprising: If the drainage plate sample meets the requirement of the limit pressure value but the deformation characteristic is excellent, performing forward fine adjustment on the basis of the original grade; the deformation characteristic is excellent, namely when the actual deformation rate is lower than 70% of the preset deformation rate threshold value of the grade when the lower limit of the limit pressure value of the grade is reached; Forward trimming includes adding a high stability type identifier to the assessment report; Removing abnormal data points which deviate from the average value of the group by +/-10% from test data of a plurality of drain board samples of the same batch; Calculating an average value of the effective data as a final characteristic value of the batch of drain board samples; when the effective data sample size is less than the preset number or the data discrete coefficient exceeds 15%, the batch of test results are judged to be invalid, and retests are needed.
10. A hierarchical test system for load bearing strength of a drain board, the system comprising: the acquisition module is used for sampling, cutting and preprocessing the drain board to be tested, and standing the preprocessed drain board sample in a standard environment for a first preset time period to acquire a prepared sample; The test module is used for placing the prepared sample on loading equipment, carrying out pressure-bearing test in a grading loading mode, and keeping the pressure stable for a second preset time period after each stage of loading; The monitoring module is used for synchronously monitoring the vertical deformation of the drain board sample under each stage of pressure in real time in the stage loading test process; the dividing module is used for dividing the bearing grade of the drainage plate sample according to the preset deformation and strength double indexes based on the vertical deformation and the ultimate bearing strength data obtained by continuously loading the drainage plate sample after the grading loading.

Description

Graded test method and system for bearing strength of drain board Technical Field The invention relates to the technical field of drainage plate testing, in particular to a grading test method and system for the bearing strength of a drainage plate. Background The drainage plate is used as a key drainage material in the fields of modern geotechnical engineering, roadbed drainage, building foundation pit support, landscaping and the like, and has the core functions of draining groundwater, reducing pore water pressure and bearing vertical pressure generated by upper earth filling, building load or construction machinery. Therefore, the load-bearing strength of the drainage plate is directly related to the long-term stability, safety and durability of the engineering structure. Different engineering scenes, such as deep foundation pits, expressway heavy load roadbeds, common building foundations or light greening sites, have obvious pressure environment differences, and have different levels of requirements on the bearing capacity and deformation coordination of the drainage plates. In order to ensure engineering safety, optimize material selection and control cost, the bearing strength of the drain board is scientifically and precisely tested and performance graded, and the drain board has become an indispensable link in production quality control, engineering design and inspection and reception. At present, the test of the bearing strength of the drain board in the industry has the common limitation that the test method is too single and can not fully reflect the performance of the product. The existing mainstream test method mostly adopts a mode of monotonously loading to sample damage, and only can obtain the final index of the ultimate compressive strength. The method ignores the fact that the drainage plate bears graded, long-term or cyclic loads in actual engineering, and cannot reveal the deformation development rule, the elastic deformation range and the plastic deformation starting point of the material under different pressure grades. The test result is disjointed with the actual stress state of the engineering, and the risk of failure caused by overlarge deformation under the working load can be covered only by limiting strength selection. Disclosure of Invention Aiming at the problems shown above, the invention provides a grading test method and system for the bearing strength of a drain board, which are used for solving the problems that the test method mentioned in the background art is too single, the product performance can not be fully reflected, and the deformation development rule, the elastic deformation range and the plastic deformation starting point of the material under different pressure grades can not be revealed. The test result is disjointed with the actual stress state of the engineering, and the problem that the risk of failure caused by overlarge deformation under the working load is possibly covered only by limiting strength type selection. A grading test method for the bearing strength of a drain board comprises the following steps: Sampling, cutting and preprocessing a drain board to be tested, and standing a preprocessed drain board sample in a standard environment for a first preset time period to obtain a prepared sample; Placing the prepared sample on loading equipment, and carrying out pressure-bearing test in a grading loading mode, wherein the pressure is kept stable for a second preset time period after each stage of loading; In the step loading test process, synchronously monitoring the vertical deformation of the drainage plate sample under each level of pressure in real time; and dividing the bearing grade of the drainage plate sample according to preset deformation and strength double indexes based on the vertical deformation and the ultimate bearing strength data obtained by continuously loading the drainage plate sample after the graded loading. Preferably, the sampling, cutting and preprocessing are performed on the drainage board to be tested, the preprocessed drainage board sample is kept stand in a standard environment for a first preset time period to obtain a prepared sample, and the method includes: Selecting a preset number of drain boards with the same specification from the same batch of products of the drain boards to be tested as an original test material; Cutting the original test material into a test sample with a preset size by adopting cutting equipment, and removing impurities and pollutants on the surface of the cut test sample; and placing the pretreated test sample in a standard environment condition, standing for a first preset time period to enable the sample to reach a performance stable state so as to obtain a prepared sample. Preferably, in the process of cutting the original test material into the test sample of a predetermined size using the cutting device, further comprising: detecting the flatness and the integrity of a cutting edge