A three-dimensional visualization monitoring method for groundwater level of deep foundation pit

Abstract

The application discloses a kind of deep foundation pit underground water level three-dimensional visualization monitoring methods, comprising: generating the three-dimensional underground retaining wall of deep foundation pit;Automatic generation and update are located in the three-dimensional underground retaining wall of deep foundation pit in pit inside and outside water level fitting three-dimensional curved surface diagram;Automatic identification and mark the highest point and the lowest point of pit inside and outside water level;Mark the depth of underground safety water level of deep foundation pit;Automatic generation and update are in three-dimensional position of the relief well of opening state;According to pit inside and outside water level fitting three-dimensional curved surface diagram and its highest point and the lowest point of pit inside and outside water level, and three-dimensional position of pit inside relief well in opening state, three-dimensional visualization monitoring is carried out to deep foundation pit underground water level.The application can carry out visualization monitoring to deep foundation pit underground water level, improves the comprehensiveness, accuracy and timeliness of monitoring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of deep foundation pit engineering, and particularly relates to a deep foundation pit underground water level three-dimensional visualization monitoring method. BACKGROUND

[0002] In the process of deep foundation pit engineering construction, the control of underground water level is a key link to ensure construction safety. The existing deep foundation pit underground water level monitoring method mainly relies on fixed measuring stations and point-to-point monitoring instruments, and uses a software platform for data integration processing. The disadvantages are:

[0003] First, the data display form is single: the existing water level monitoring data is mainly presented in the form of a table, and the data display is relatively monotonous. It is difficult for the management personnel to quickly grasp all the related data of the foundation pit dewatering through the table, resulting in low decision-making efficiency.

[0004] Second, it is difficult to visually monitor: the changes of the water level inside and outside the foundation pit have certain regularity, but the table data is difficult to visually present these regularities, and the management personnel are difficult to understand the spatial distribution and dynamic change of the water level inside and outside the foundation pit through table number comparison.

[0005] Third, the monitoring point is fixed: the water level monitoring in the foundation pit usually relies on a small number of fixed measuring points, which cannot comprehensively reflect the overall water level of the foundation pit. The water level in the foundation pit changes complexly, and the data of a single or fixed measuring point is not enough to accurately reflect the overall situation, which is easy to cause the blind area of water level monitoring, affecting the construction safety and management efficiency. SUMMARY

[0006] The purpose of the present application is to provide a deep foundation pit underground water level three-dimensional visualization monitoring method to solve the problems of poor monitoring effect, non-intuitive, inability to display the spatial distribution and dynamic change of the underground water inside and outside the foundation pit, and the inability of point monitoring to reflect the overall situation of the underground water of the foundation pit.

[0007] In order to solve the above technical problems, the present application provides a deep foundation pit underground water level three-dimensional visualization monitoring method, comprising:

[0008] generating a three-dimensional underground retaining wall of the deep foundation pit;

[0009] automatically generating and updating a three-dimensional curved surface graph of the water level inside the pit located in the three-dimensional underground retaining wall of the deep foundation pit according to the distribution data of the observation well inside the deep foundation pit;

[0010] automatically generating and updating a three-dimensional curved surface graph of the water level outside the pit located outside the three-dimensional underground retaining wall of the deep foundation pit according to the distribution data of the observation well outside the deep foundation pit;

[0011] automatically identifying and labeling the highest point and the lowest point of the water level inside and outside the pit according to the three-dimensional curved surface graph of the water level inside and outside the pit.

[0012] According to the geological conditions, the deep foundation pit plane is divided into multiple sub-regions, a safety water level plane of each sub-region is drawn, a three-dimensional curved surface graph of the water level in the pit is fitted according to the water level inside and outside the pit in each sub-region, the fitted water level plane of each sub-region is compared with the safety water level plane, whether the safety water level of each sub-region has a safety risk is evaluated, and the safety water level depth is marked on each sub-region of the three-dimensional curved surface graph of the water level in the pit fitted.

[0013] On the three-dimensional curved surface graph of the water level in the pit, the three-dimensional positions of the decompression wells in the open state are automatically generated and updated according to the distribution data and the opening and closing state data of the decompression wells in the deep foundation pit.

[0014] According to the three-dimensional curved surface graph of the water level in the pit fitted, the highest point and the lowest point of the water level inside and outside the pit, and the three-dimensional positions of the decompression wells in the open state, the groundwater level of the deep foundation pit is monitored in three dimensions.

[0015] Further, the deep foundation pit groundwater level three-dimensional visualization monitoring method provided by the present application, the method for generating the three-dimensional underground retaining wall of the deep foundation pit comprises:

[0016] The program is compiled by using the Matlab software, the plane coordinates of each corner point of the underground retaining wall are determined, the three-dimensional structure of the underground retaining wall is generated, the top end point coordinates of the underground retaining wall are translated downward along the z-axis to the bottom of the underground retaining wall to generate the bottom end point of the underground retaining wall, the three-dimensional structure of the wall side surface of each underground retaining wall is drawn by using the fill3 function, and the three-dimensional solid graph of the underground retaining wall is constructed by connecting the boundary end points of the top and the bottom to form the three-dimensional underground retaining wall of the deep foundation pit.

[0017] Further, the deep foundation pit groundwater level three-dimensional visualization monitoring method provided by the present application, the method for generating the three-dimensional underground retaining wall of the deep foundation pit comprises:

[0018] In the Matlab software, the plane coordinates of the observation wells in the pit are determined according to the distribution position data of the observation wells in the deep foundation pit, the meshgrid function is used to divide the plane of the deep foundation pit into grids to generate a coordinate matrix, and the corresponding (x, y) coordinate grid is created in the two-dimensional region; the z-direction coordinates of the water level of each observation well are determined according to the water level data of the observation wells in the deep foundation pit, and the three-dimensional coordinates of each water level observation point are obtained.

[0019] The three-dimensional coordinates are used to determine the water level z(x, y) of any point (x, y) by using the griddata function to perform three times interpolation, and the three-dimensional curved surface graph of the water level in the pit located in the three-dimensional underground retaining wall of the deep foundation pit is generated.

[0020] Further, the deep foundation pit underground water level three-dimensional visualization monitoring method provided by the present application, the method for determining the water level z(x, y) of any point (x, y) by cubic interpolation includes:

[0021] Piecewise cubic polynomial interpolation processing: for each local area composed of adjacent triangular grids, the griddata function constructs a cubic polynomial function of formula (1) in the area:

[0022] z(x, y) = a + bx + cy + dx2+ exy + fy2+ gx3+ hx2y + ix y2+ jy3 (1);

[0023] Wherein a, b, c, …, j are coefficients determined according to the known data point coordinates and water level values;

[0024] Continuity and smoothness processing: in order to ensure smooth transition of the interpolation surface during piecewise interpolation, the first and second derivatives at the boundary of adjacent triangles are made continuous through an optimization algorithm, so that the smoothness of the entire interpolation surface at the transition point is ensured.

[0025] Calculate the value of the interpolation point: once the triangular grid containing all the data points is established, and the cubic polynomial model is generated in each area, for any interpolation point, first determine the grid where the point is located, and then substitute the coordinates into the corresponding cubic polynomial to estimate the water level value of the point.

[0026] Further, the deep foundation pit underground water level three-dimensional visualization monitoring method provided by the present application, the method for automatically generating a three-dimensional curved surface graph of the pit water level outside the three-dimensional underground retaining wall located outside the deep foundation pit according to the distribution data of the observation well outside the deep foundation pit is the same as the method for generating a three-dimensional curved surface graph of the pit water level inside the three-dimensional underground retaining wall located inside the deep foundation pit.

[0027] Further, the deep foundation pit underground water level three-dimensional visualization monitoring method provided by the present application, the method for automatically generating and updating the three-dimensional position of the pressure relief well in the open state according to the distribution data and the on-off state data of the pressure relief well in the deep foundation pit on the three-dimensional curved surface graph of the pit water level includes:

[0028] Data screening: obtain the position, depth and on-off state of each pressure relief well from the data source, define the plane coordinates (x, y), well depth H and state open, open = 1 for open state, open = 0 for closed state;

[0029] On-off state drawing: select the pressure relief well in the open state; for each pressure relief well in the open state, draw a blue cylinder using the surf function in the Matlab software, and the blue cylinder extends from the ground surface (x, y, 0) to the well depth (x, y, -H), thereby automatically generating the three-dimensional position of the pressure relief well in the open state.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] The deep foundation pit underground water level three-dimensional visualization monitoring method provided by the present application can monitor the deep foundation pit underground water level in three dimensions through fitting a three-dimensional curved surface graph of the water level inside and outside the pit, and can monitor the overall situation of the water level inside and outside the pit, fully display the spatial distribution of the water level inside and outside the pit, overcome the problem of incomplete data or blind area caused by fixed monitoring points in the traditional monitoring method, and improve the comprehensiveness and accuracy of monitoring; the highest point and the lowest point of the water level inside and outside the pit can be monitored visually through the highest point and the lowest point of the water level marked on the three-dimensional curved surface graph; whether the safety water level of each sub-region of the deep foundation pit has a safety risk can be monitored in three dimensions through the identification of the safety water level on the three-dimensional curved surface graph; thus, safe construction in the deep foundation pit is ensured; the opening, position and depth of the pit pressure relief well inside the pit can be monitored in three dimensions through the three-dimensional position of the pit pressure relief well drawn on the three-dimensional curved surface graph; through real-time operation and processing of the monitoring data, timely updating and display of daily water level data are realized, so that the management personnel can grasp the dynamic change of the water level of the foundation pit at any time, the timeliness and accuracy of monitoring are improved, the construction risk caused by data delay is reduced, the limitation of the traditional fixed monitoring point is effectively overcome through data fitting technology, the monitoring coverage is expanded, the monitoring accuracy is significantly improved, the water level distribution of the foundation pit can be fully reflected, the potential water level blind area risk is reduced, and thus the decision-making efficiency of the deep foundation pit construction is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a flowchart of the deep foundation pit underground water level three-dimensional visualization monitoring method;

[0033] Figure 2 is an effect diagram of generating a three-dimensional underground retaining wall of the deep foundation pit by using Matlab software;

[0034] Figure 3 is a three-dimensional curved surface graph of the water level inside the deep foundation pit three-dimensional underground retaining wall automatically generated and updated;

[0035] Figure 4 is a three-dimensional curved surface graph of the water level outside the deep foundation pit three-dimensional underground retaining wall automatically generated and updated;

[0036] Figure 5 is an effect diagram of automatically marking the highest point and the lowest point of the water level inside and outside the pit on the three-dimensional curved surface graph of the water level inside and outside the pit;

[0037] Figure 6 is an effect diagram of marking the safety water level depth on the three-dimensional curved surface graph of the water level inside and outside the pit;

[0038] Figure 7 is the effect drawing of the relief well in the open state on the three-dimensional curved surface drawing of the water level in the pit;

[0039] Figure 8 is the three-dimensional visualization effect drawing of the groundwater level in the third support, the fourth support and the bottom plate stage during the deep foundation pit excavation process. DETAILED DESCRIPTION

[0040] The present application will be described in detail below with reference to the accompanying drawings: According to the following description, the advantages and characteristics of the present application will be more apparent. It should be noted that the drawings are very simplified and all use non-precise proportions, only to facilitate, clear and assist in the purpose of explaining the embodiments of the present application.

[0041] Please refer to Figure 1 , the embodiment of the present application provides a deep foundation pit groundwater level three-dimensional visualization monitoring method, which can include:

[0042] Step S110, generate a three-dimensional underground retaining wall of the deep foundation pit. Specifically, a program can be written using Matlab or other software to determine the plane coordinates of each corner point of the underground retaining wall, generate the three-dimensional structure of the underground retaining wall, translate the top endpoint coordinates of the underground retaining wall along the z-axis to the bottom of the underground retaining wall, generate the bottom endpoint of the underground retaining wall, use the fill3 function to draw the three-dimensional structure of the wall side of each underground retaining wall, and construct the three-dimensional drawing of the underground retaining wall by connecting the boundary endpoints of the top and bottom to form the three-dimensional underground retaining wall of the deep foundation pit, as shown in Figure 2 .

[0043] Step S120, automatically generate and update the three-dimensional curved surface drawing of the water level in the pit located in the three-dimensional underground retaining wall of the deep foundation pit according to the distribution data of the observation wells in the deep foundation pit, as shown in Figure 3 . Specifically, the plane coordinates of the observation wells in the pit can be determined according to the distribution position data of the observation wells in the deep foundation pit in the Matlab software, the meshgrid function is used to divide the plane of the deep foundation pit into a grid to generate a coordinate matrix, and the corresponding (x, y) coordinate grid is created in the two-dimensional region; the z-direction coordinates of the water level of each observation well are determined according to the water level data of the observation wells in the deep foundation pit, and the three-dimensional coordinates of each water level observation point are obtained; the three-dimensional coordinates are used to determine the water level z(x, y) of any point (x, y) by using the griddata function for data cubic interpolation, and the three-dimensional curved surface drawing of the water level in the pit located in the three-dimensional underground retaining wall of the deep foundation pit is generated. The method for determining the water level z(x, y) of any point (x, y) by cubic interpolation includes:

[0044] Step S121, piecewise cubic polynomial interpolation processing: for each local area composed of adjacent triangular meshes, the griddata function constructs a cubic polynomial function of formula (1) in the area:

[0045] z(x,y) = a + bx + cy + dx2+ exy + fy2+ gx3+ hx2y + ix y2+ jy3 (1);

[0046] Wherein a, b, c, …, j are coefficients determined according to the known data point coordinates and water level values.

[0047] Step S122, continuity and smoothness processing: in order to ensure smooth transition of the interpolation surface when performing piecewise interpolation, the first and second derivatives at the boundary of adjacent triangles are made continuous through an optimization algorithm, so as to make the smoothness of the entire interpolation surface at the transition point. Through continuity and smoothness processing, discontinuous or sharp transitions can be avoided, and the display effect can be improved.

[0048] Step S123, calculating the value of the interpolation point: once the triangular mesh containing all data points is established, and the cubic polynomial model is generated in each area, for any interpolation point, first determine the grid where the point is located, and then substitute the coordinates into the corresponding cubic polynomial to estimate the water level value of the point.

[0049] In this way, a three-dimensional water level fitting surface in the entire deep foundation pit is obtained according to the discrete measurement points.

[0050] Step S130, automatically generating and updating the pit water level fitting three-dimensional surface graph outside the three-dimensional underground retaining wall in the deep foundation pit according to the distribution data of the observation well outside the deep foundation pit, as shown in Figure 4 The method of generating the pit water level fitting three-dimensional surface graph is the same as that of generating the pit water level fitting three-dimensional surface graph. The pit water level is mainly used for comparison with the pit water level. If the water level difference is large, attention should be paid to whether the retaining structure at this position leaks.

[0051] Step S140, automatically identifying the highest point and the lowest point of the pit water level and automatically labeling according to the pit water level fitting three-dimensional surface graph, as shown in Figure 5

[0052] Step S150, according to the geological conditions, the deep foundation pit plane is divided into a plurality of sub-regions, the safety water level plane of each sub-region is drawn, the fitting water level plane of each sub-region is identified according to the pit water level fitting three-dimensional surface graph, and the fitting water level plane is compared with the safety water level plane, the safety risk of the safety water level of each sub-region is evaluated, and the safety water level depth is labeled on each sub-region of the pit water level fitting three-dimensional surface graph, as shown in Figure 6 ​The highest and lowest points of the water level inside and outside the pit are used to compare the water level difference inside and outside the pit to determine the water stopping effect of the enclosure (underground continuous wall), and to compare the safety water level to determine whether the water level inside the pit is safe. The safety water level of each sub-region is different, and the safety water level of each sub-region will also be different at each excavation stage. In the specific operation, the actual water level is compared with the safety water level using a conditional judgment statement:

[0053] “if z(i,j)<safety_level(i,j)

[0054] Risk exists

[0055] end”。

[0056] Step S160, automatically generating and updating the three-dimensional position of the relief well in the open state on the three-dimensional curved surface diagram of the water level fitting in the pit according to the distribution data and the on-off state data of the relief well in the deep foundation pit, as shown in Figure 7 . Specifically, it can be:

[0057] Step S161, data screening: obtaining the position, depth and on-off state of each relief well from the data source, defining the plane coordinates (x, y), well depth H and state open, open = 1 for open state, and open = 0 for closed state.

[0058] Step S162, on-off state drawing: selecting the relief well in the open state; for each relief well in the open state, a blue cylinder is drawn in the Matlab software using the surf function, and the blue cylinder extends from the ground surface (x, y, 0) to the well depth (x, y, -H), thereby automatically generating the three-dimensional position of the relief well in the open state. The color in the blue cylinder can be other colors. That is, the plane coordinates of the relief well are extracted, and the position and depth of the opened relief well are drawn in the three-dimensional diagram according to the on-off state data of the relief well.

[0059] In this step, only the relief well in the open state is displayed, and the relief well in the closed state is not displayed, in order to reduce visual interference and highlight the spatial position and depth distribution of the open well.

[0060] Step S170, three-dimensional visualization monitoring of the groundwater level of the deep foundation pit according to the three-dimensional curved surface diagram of the water level fitting inside and outside the pit, the highest and lowest points of the water level inside and outside the pit, and the three-dimensional position of the relief well in the open state inside the pit.

[0061] The above steps are only examples, but are not limited to the above steps, for example: the order of steps S120 and S130 can be interchanged, and step S160 can be performed before step S140.

[0062] The deep foundation pit underground water level three-dimensional visualization monitoring method provided by the embodiment of the present application can monitor the deep foundation pit underground water level in three dimensions through fitting a three-dimensional curved surface graph of the water level inside and outside the pit, and can facilitate monitoring the overall condition of the water level inside and outside the pit, fully display the spatial distribution of the water level inside and outside the pit, overcome the problem of incomplete data or blind area caused by fixed monitoring points in the traditional monitoring method, and improve the comprehensiveness and accuracy of monitoring; the highest point and the lowest point of the water level inside and outside the pit can be monitored visually through the highest point and the lowest point of the water level marked on the three-dimensional curved surface graph of the water level inside and outside the pit; whether the safety water level of each sub-region of the deep foundation pit has a safety risk can be monitored in three dimensions through the identification of the safety water level on the three-dimensional curved surface graph of the water level inside and outside the pit; thus, the safety of construction in the deep foundation pit is ensured; the opening condition, position and depth of the pressure relief well inside the pit can be monitored in three dimensions through the three-dimensional position of the pressure relief well inside the pit drawn on the three-dimensional curved surface graph of the water level inside the pit; through real-time operation and processing of the monitoring data, timely updating and display of daily water level data are realized, the dynamic change of the water level of the foundation pit can be grasped by the management personnel at any time, the timeliness and accuracy of monitoring are ensured, the construction risk caused by data delay is reduced, the limitation of the traditional fixed monitoring point is effectively made up by using the data fitting technology, the monitoring coverage is expanded, the monitoring precision is significantly improved, the water level distribution of the foundation pit can be fully reflected, the potential water level blind area risk is reduced, and thus the decision efficiency of the deep foundation pit construction is significantly improved.

[0063] Please refer to Figure 8 , respectively, show the fitting three-dimensional curved surface graph of the underground water level in the third support, the fourth support and the bottom plate stage, and the water level inside each stage can meet the requirement of the safety water level depth. Starting from the third support, the number of the dewatering wells opened in each stage gradually increases, and the water level inside the pit and the safety water level depth gradually decrease. The water level outside the pit and the water level inside the pit always maintain a certain height difference, which proves that the water resistance performance of the underground enclosure wall is good. At the same time, the water level near the edge outside the pit (5 meters away from the underground enclosure wall) is always lower than the water level far away from the underground enclosure wall (20 meters away from the underground enclosure wall) by a certain height, which also conforms to the "funnel effect" of the underground water of the foundation pit. After receiving the water level data report every day, the project management personnel draw the water level three-dimensional graph at the first time to understand the change of the water level inside and outside the pit. If the water level is higher or exceeds the safety water level depth, they can quickly confirm the dangerous position of the water level of the foundation pit and take corresponding preventive measures to control the construction under the complex geological condition.

[0064] The deep foundation pit underground water level three-dimensional visualization monitoring method provided by the embodiment of the present application uses the Matlab software to write programs to realize three-dimensional display of the water level inside and outside the pit, the safety water level and the opening and closing condition of the pressure relief well, and uses the fitting method to make up for the deficiency of the fixed monitoring point; the programming means is used to improve the timeliness of data updating.

[0065] The present application is not limited to the above-described specific embodiments, and it is obvious that the above-described embodiments are part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those skilled in the art based on the described embodiments of the present application belong to the scope of protection of the present application. Those skilled in the art can make other levels of modifications and changes to the present application. Thus, if these modifications and changes of the present application belong to the scope of the claims of the present application, the present application also intends to include these modifications and changes.

Claims

1. A method for three-dimensional visualization monitoring of groundwater level in deep foundation pit, characterized in that, The method comprises the following steps: generating a three-dimensional underground retaining wall of a deep foundation pit; automatically generating and updating a three-dimensional fitting surface graph of an in-pit water level in the three-dimensional underground retaining wall of the deep foundation pit according to distribution data of observation wells in the deep foundation pit; automatically generating and updating a three-dimensional fitting surface graph of an out-pit water level outside the three-dimensional underground retaining wall of the deep foundation pit according to distribution data of observation wells outside the deep foundation pit; automatically identifying and labeling the highest point and the lowest point of the in-pit and out-pit water levels according to the three-dimensional fitting surface graphs of the in-pit and out-pit water levels; dividing a plane of the deep foundation pit into a plurality of sub-regions according to geological conditions, drawing a safety water level plane of each sub-region, identifying a fitting water level plane of each sub-region according to the three-dimensional fitting surface graphs of the in-pit and out-pit water levels in each sub-region, and comparing the fitting water level plane with the safety water level plane to evaluate whether the safety water level of each sub-region has a safety risk and label the safety water level depth on each sub-region of the three-dimensional fitting surface graphs of the in-pit and out-pit water levels; automatically generating and updating a three-dimensional position of a relief well in an open state in the three-dimensional fitting surface graph of the in-pit water level according to distribution data and on-off state data of the relief well in the deep foundation pit; performing three-dimensional visual monitoring on the underground water level of the deep foundation pit according to the three-dimensional fitting surface graphs of the in-pit and out-pit water levels, the highest point and the lowest point of the in-pit and out-pit water levels, and the three-dimensional position of the relief well in the open state in the deep foundation pit.

2. The method for three-dimensional visualization monitoring of groundwater level of deep foundation pit according to claim 1, characterized in that, The method for generating the three-dimensional underground retaining wall of the deep foundation pit comprises the following steps: writing a program by using Matlab software, determining plane coordinates of each corner point of the underground retaining wall, generating a three-dimensional structure of the underground retaining wall, translating the top end point coordinates of the underground retaining wall downward along the z-axis to the bottom of the underground retaining wall to generate a bottom end point of the underground retaining wall, using a fill3 function to draw a three-dimensional structure of a wall side surface of each underground retaining wall, and constructing a three-dimensional solid graph of the underground retaining wall by connecting boundary end points of the top and the bottom to form the three-dimensional underground retaining wall of the deep foundation pit.

3. The method of claim 1, wherein The method for automatically generating the three-dimensional fitting surface graph of the in-pit water level in the three-dimensional underground retaining wall of the deep foundation pit according to distribution data of observation wells in the deep foundation pit comprises the following steps: determining plane coordinates of the in-pit observation wells according to the distribution position data of the observation wells in the deep foundation pit in the Matlab software, adopting a meshgrid function to divide a plane of the deep foundation pit into a grid to generate a coordinate matrix and create a corresponding (x, y) coordinate grid in a two-dimensional region, determining z-direction coordinates of the water level of each observation well according to water level data of the observation wells in the deep foundation pit to obtain three-dimensional coordinates of each water level observation point; using the three-dimensional coordinates to use a griddata function to perform three times interpolation on data to determine a water level z(x, y) of an arbitrary point (x, y) to generate the three-dimensional fitting surface graph of the in-pit water level in the three-dimensional underground retaining wall of the deep foundation pit.

4. The method of claim 3, wherein the method further comprises: determining a water level of the deep foundation pit at each of the plurality of locations; and determining a water level of the deep foundation pit at each of the plurality of locations based on the water level of the deep foundation pit at each of the plurality of locations. The method for determining the water level z(x, y) of the arbitrary point (x, y) by three times interpolation comprises the following steps: segmented three times polynomial interpolation processing: for each local region composed of adjacent triangular grids, the griddata function constructs a three times polynomial function of formula (1) in the region: z(x,y) = a + bx + cy + dx 2 + exy + fy 2 + gx 3 + hx 2 + iy 2 + jy 3 (1); wherein a, b, c, …, j are coefficients determined according to known data point coordinates and water level values. Continuity and smoothness processing: in order to ensure the smooth transition of the interpolation surface when performing piecewise interpolation, the first and second derivatives at the boundary of adjacent triangles are made continuous through an optimization algorithm, so as to make the smoothness of the entire interpolation surface at the transition point; Calculating the value of the interpolation point: once the triangular mesh containing all the data points is established and the cubic polynomial model is generated in each region, for any interpolation point, first determine the grid where the point is located, and then substitute the coordinates into the corresponding cubic polynomial to estimate the water level value of the point.

5. The method of claim 3, wherein, The method for automatically generating the three-dimensional fitting surface of the water level outside the deep foundation pit according to the distribution data of the observation wells outside the deep foundation pit is the same as the method for generating the three-dimensional fitting surface of the water level inside the deep foundation pit according to the distribution data of the observation wells inside the deep foundation pit.

6. The method for three-dimensional visualization monitoring of groundwater level of deep foundation pit according to claim 1, characterized in that, The method for automatically generating and updating the three-dimensional position of the relief well in the open state on the three-dimensional fitting surface of the water level inside the deep foundation pit according to the distribution data and the on-off state data of the relief well inside the deep foundation pit comprises: Data screening: obtaining the position, depth and on-off state of each relief well from the data source, defining the plane coordinates (x, y), well depth H and state open, open = 1 for the open state and open = 0 for the closed state; On-off state drawing: screening out the relief well in the open state; for each relief well in the open state, a blue cylinder is drawn in the Matlab software using the surf function, and the blue cylinder extends from the ground surface (x, y, 0) to the well depth (x, y, -H), thereby automatically generating the three-dimensional position of the relief well in the open state.

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