CN114357595A - Method and system for predicting horizontal displacement of side wall of foundation pit based on Forecast function - Google Patents
Method and system for predicting horizontal displacement of side wall of foundation pit based on Forecast function Download PDFInfo
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Abstract
The invention belongs to the field of foundations, and provides a method and a system for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function. The method comprises the steps of obtaining a deformation value of a certain point of the side wall of the foundation pit; obtaining the deformation value of a certain point of the side wall of the foundation pit after the set number of days from the latest measurement data by adopting a Forecast function based on the deformation value of the certain point of the side wall of the foundation pit; and (4) according to the deformation value of a certain point of the side wall of the foundation pit after the days are set from the latest measurement data, and combining the safety level of the side wall of the foundation pit to obtain the predicted deformation.
Description
Technical Field
The invention belongs to the field of foundations, and particularly relates to a method and a system for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Along with the expansion of urban underground space, deep foundation pit engineering is more and more. Deformation, especially horizontal displacement deformation, generated in the construction process of the deep foundation pit must be strictly controlled, otherwise, the whole foundation pit construction is adversely affected. For this reason, deep pit monitoring work is also increasingly showing its importance. The deep foundation pit monitoring technology is characterized in that a deformation value of a foundation pit supporting structure (a foundation pit side wall) is measured through an engineering measurement knowledge theory and a method, and a displacement deformation value of a foundation pit is determined through analysis of the deformation value. However, this method has a disadvantage that only the deformation value that has occurred can be measured, and the deformation value that has occurred cannot make a more accurate judgment of the danger that the foundation pit may occur. In view of the above, it is imperative to find a method for predicting the deformation of the foundation pit.
Disclosure of Invention
In order to solve the technical problems existing in the background technology, the invention provides a method and a system for predicting the horizontal displacement of the side wall of a foundation pit based on a Forecast function.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for predicting the horizontal displacement of the side wall of a foundation pit based on a Forecast function.
A method for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function comprises the following steps:
obtaining a deformation value of a certain point of the side wall of the foundation pit;
obtaining the deformation value of a certain point of the side wall of the foundation pit after the set number of days from the latest measurement data by adopting a Forecast function based on the deformation value of the certain point of the side wall of the foundation pit;
and (4) according to the deformation value of a certain point of the side wall of the foundation pit after the days are set from the latest measurement data, and combining the safety level of the side wall of the foundation pit to obtain the predicted deformation.
Further, the acquiring a deformation value of a certain point of the side wall of the foundation pit comprises: and acquiring the deformation value of a certain point of the side wall of the foundation pit within a continuously set time interval.
Still further, the unit of the time interval is day or hour.
Further, after the predicted deformation is obtained, judging whether the predicted deformation exceeds a set threshold value, and if so, alarming.
Further, the deformation value is a horizontal displacement amount.
Further, after the obtaining of the deformation value of a certain point of the side wall of the foundation pit, the method includes: calculating mathematical expectation and variance of a certain point of the side wall of the foundation pit within a period of time based on the deformation value of the certain point; determining a confidence interval based on the mathematical expectation and variance of the point; and based on the confidence interval, rejecting numerical values outside the confidence interval.
Further, the safety grade of the side wall of the foundation pit determines an importance coefficient of the safety grade of the side wall of the foundation pit.
Furthermore, the importance coefficient of the safety grade of the side wall of the first-level foundation pit corresponding to the safety grade of the side wall of the foundation pit is 1.1; the importance coefficient of the safety grade of the side wall of the second-level foundation pit corresponding to the safety grade of the side wall of the foundation pit is 1.0; the importance coefficient of the safety grade of the side wall of the third-level foundation pit corresponding to the safety grade of the side wall of the foundation pit is 0.9.
Further, the predicted deformation = deformation value of a certain point of the side wall of the foundation pit in days from the setting of the latest measurement data × importance coefficient of the safety level of the side wall of the foundation pit.
The invention provides a system for predicting the horizontal displacement of the side wall of the foundation pit based on a Forecast function.
A system for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function comprises the following components:
an acquisition module configured to: obtaining a deformation value of a certain point of the side wall of the foundation pit;
a processing module configured to: obtaining the deformation value of a certain point of the side wall of the foundation pit after the set number of days from the latest measurement data by adopting a Forecast function based on the deformation value of the certain point of the side wall of the foundation pit;
a prediction module configured to: and (4) according to the deformation value of a certain point of the side wall of the foundation pit after the days are set from the latest measurement data, and combining the safety level of the side wall of the foundation pit to obtain the predicted deformation.
Compared with the prior art, the invention has the beneficial effects that:
the foundation pit side wall displacement prediction method introduced by the invention can provide deformation data support for foundation pit construction by applying a Forecast function algorithm, continuously analyzing and processing historical data serving as a prototype and scientifically predicting a deformation value; therefore, guidance is provided for the next construction of the foundation pit, and unnecessary early warning measures are reduced.
The invention can predict the deformation value in advance, thereby being purposeful, taking treatment measures in advance at the dangerous position of the foundation pit, saving resources and improving the working efficiency.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of a method for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It is noted that the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and systems according to various embodiments of the present disclosure. It should be noted that each block in the flowchart or block diagrams may represent a module, a segment, or a portion of code, which may comprise one or more executable instructions for implementing the logical function specified in the respective embodiment. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Example one
As shown in fig. 1, the present embodiment provides a method for predicting horizontal displacement of a sidewall of a foundation pit based on a Forecast function, where the method includes the following steps:
obtaining a deformation value of a certain point of the side wall of the foundation pit;
obtaining the deformation value of a certain point of the side wall of the foundation pit after the set number of days from the latest measurement data by adopting a Forecast function based on the deformation value of the certain point of the side wall of the foundation pit;
and (4) according to the deformation value of a certain point of the side wall of the foundation pit after the days are set from the latest measurement data, and combining the safety level of the side wall of the foundation pit to obtain the predicted deformation.
1. Measuring original data:
measuring the deformation value (horizontal displacement, the same below) of a certain point of the side wall of the foundation pit according to the technical requirements on horizontal displacement measurement in engineering measurement Standard GB50026-2020 and building deformation measurement Specification JGJ8-2016
(unit: mm) and the time interval T of the same last measurementi(unit: d) and is shown in Table 1 below. Let the initial value be 0, i.e.
，T1= 0; the process can last for several months, and the danger occurrence possibility in the initial excavation stage of the foundation pit is low, and the initial excavation stage is a data acquisition stage.
Table 1 original data record table
2. Data analysis and culling
Due to the influence of human factors, instrument factors and the like in the actual measurement process, certain errors can be generated in the data measured in the step 1. According to the error theory and the normal distribution theory, the product obtained in the step 1
The data were analyzed. Determining a mathematical expectation of the set of data
Variance, variance
According to the normal distribution theory, the confidence level is 95%, and the confidence interval is
And eliminating numerical values outside the confidence interval.
Wherein:
in this example
And n represents the number of deformation values measured at a certain point of the side wall of the foundation pit.
3. The data obtained in step 2
Make statistics of
Corresponding to x = Ti。
4. Importing the data obtained in the step 3 into EXCEL, and enabling the value of x to be Ti，
The value of (d) is y. Endowing a new T by using a Forecast functioni+a(a is a day after the last measurement), obtaining
(ii) a The specific calculation steps are shown in table 2 below:
table 2: predicting deformation value based on Forecast function
Table 2 shows that from 2021.4.29 to 2021.5.4, a deformation value of 0.379mm will result (uncorrected).
5. The control values of deformation are different due to foundation pits with different safety levels. Now obtained in step 4
Multiplying the final deformation predicted value by a correction coefficient K according to the regulation of 'construction foundation pit support technical regulation' JGJ120-2012, 3.1.6
. The values of K are shown in table 3:
table 3: importance coefficient of safety grade of side wall of foundation pit
Then:
according to the calculation results in table 2, assuming that the safety level of a certain foundation pit is one level, the final predicted deformation is:
namely, the higher the safety level of the foundation pit is, the larger the corrected predicted deformation value is, so that the warning effect can be achieved.
According to the specification of 8.0.4 soil foundation pit and supporting structure monitoring early warning values in the technical Standard for monitoring construction Foundation pit engineering GB 50497 and 2019, if calculated
If the numerical value of the table is exceeded, early warning is needed immediately, and if the numerical value of the table is not exceeded, the safety of the side wall of the foundation pit is indicated, and early warning is not needed. The embodiment relates to the relationship between the safety level of the foundation pit and the horizontal displacement early warning value at the top of the enclosure wall, as shown in table 4.
TABLE 4 early warning value of safety grade of foundation pit and horizontal displacement of top of enclosure wall
Example two
The embodiment provides a system for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function.
A system for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function comprises the following components:
an acquisition module configured to: obtaining a deformation value of a certain point of the side wall of the foundation pit;
a processing module configured to: obtaining the deformation value of a certain point of the side wall of the foundation pit after the set number of days from the latest measurement data by adopting a Forecast function based on the deformation value of the certain point of the side wall of the foundation pit;
a prediction module configured to: and (4) according to the deformation value of a certain point of the side wall of the foundation pit after the days are set from the latest measurement data, and combining the safety level of the side wall of the foundation pit to obtain the predicted deformation.
It should be noted here that the acquiring module, the processing module and the predicting module are the same as those of the example and the application scenario realized by the steps in the first embodiment, but are not limited to the disclosure of the first embodiment. It should be noted that the modules described above as part of a system may be implemented in a computer system such as a set of computer-executable instructions.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function is characterized by comprising the following steps:
obtaining a deformation value of a certain point of the side wall of the foundation pit;
obtaining the deformation value of a certain point of the side wall of the foundation pit after the set number of days from the latest measurement data by adopting a Forecast function based on the deformation value of the certain point of the side wall of the foundation pit;
and (4) according to the deformation value of a certain point of the side wall of the foundation pit after the days are set from the latest measurement data, and combining the safety level of the side wall of the foundation pit to obtain the predicted deformation.
2. The method for predicting the horizontal displacement of the side wall of the foundation pit based on the Forecast function as claimed in claim 1, wherein the step of obtaining the deformation value of a certain point of the side wall of the foundation pit comprises the following steps: and acquiring the deformation value of a certain point of the side wall of the foundation pit within a continuously set time interval.
3. The method for predicting the horizontal displacement of the side wall of the foundation pit based on the Forecast function as claimed in claim 2, wherein the unit of the time interval is day or hour.
4. The method for predicting the horizontal displacement of the side wall of the foundation pit based on the Forecast function as claimed in claim 1, wherein after the predicted deformation is obtained, the method comprises the steps of judging whether the predicted deformation exceeds a set threshold value, and if so, giving an alarm.
5. The method for predicting the horizontal displacement of the side wall of the foundation pit based on the Forecast function as claimed in claim 1, wherein the deformation value is a horizontal displacement.
6. The method for predicting the horizontal displacement of the side wall of the foundation pit based on the Forecast function as claimed in claim 1, wherein after the step of obtaining the deformation value of a certain point of the side wall of the foundation pit, the method comprises the following steps: calculating mathematical expectation and variance of a certain point of the side wall of the foundation pit within a period of time based on the deformation value of the certain point; determining a confidence interval based on the mathematical expectation and variance of the point; and based on the confidence interval, rejecting numerical values outside the confidence interval.
7. The method for predicting the horizontal displacement of the side wall of the foundation pit based on the Forecast function as claimed in claim 1, wherein the safety level of the side wall of the foundation pit determines an importance coefficient of the safety level of the side wall of the foundation pit.
8. The method for predicting the horizontal displacement of the side wall of the foundation pit based on the Forecast function as claimed in claim 7, wherein the importance coefficient of the safety level of the side wall of the first-level foundation pit corresponding to the safety level of the side wall of the foundation pit is 1.1; the importance coefficient of the safety grade of the side wall of the second-level foundation pit corresponding to the safety grade of the side wall of the foundation pit is 1.0; the importance coefficient of the safety grade of the side wall of the third-level foundation pit corresponding to the safety grade of the side wall of the foundation pit is 0.9.
9. The method for predicting the horizontal displacement of the side wall of the foundation pit based on the Forecast function as claimed in claim 7, wherein the predicted deformation = deformation value of a certain point of the side wall of the foundation pit after a set number of days from the latest measurement data x importance coefficient of safety level of the side wall of the foundation pit.
10. A system for predicting horizontal displacement of a side wall of a foundation pit based on a Forecast function is characterized by comprising the following steps:
an acquisition module configured to: obtaining a deformation value of a certain point of the side wall of the foundation pit;
a processing module configured to: obtaining the deformation value of a certain point of the side wall of the foundation pit after the set number of days from the latest measurement data by adopting a Forecast function based on the deformation value of the certain point of the side wall of the foundation pit;
a prediction module configured to: and (4) according to the deformation value of a certain point of the side wall of the foundation pit after the days are set from the latest measurement data, and combining the safety level of the side wall of the foundation pit to obtain the predicted deformation.
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