CN113935096A - Method and system for monitoring foundation pit deformation in real time - Google Patents
Method and system for monitoring foundation pit deformation in real time Download PDFInfo
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- CN113935096A CN113935096A CN202111249493.9A CN202111249493A CN113935096A CN 113935096 A CN113935096 A CN 113935096A CN 202111249493 A CN202111249493 A CN 202111249493A CN 113935096 A CN113935096 A CN 113935096A
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- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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Abstract
The application discloses a method and a system for monitoring foundation pit deformation in real time, which relate to the technical field of foundation pit monitoring, and the method comprises the following steps: acquiring field surveying and mapping data of a foundation pit; constructing a three-dimensional model of the foundation pit by using a BIM system and based on field mapping data; respectively arranging a plurality of reference points in each plane of the foundation pit; generating a model reference point at a corresponding location in the three-dimensional model based on the location of the reference point; performing construction simulation on the three-dimensional model by using a BIM system based on a preset foundation pit construction plan to respectively obtain simulation change tracks of each model reference point; acquiring actual change tracks of all reference points in a foundation pit, and constructing the foundation pit according to a foundation pit construction plan; and monitoring the deformation condition of the foundation pit by combining the actual change track and the simulated change track, and if the deformation condition occurs, sending warning information to a responsible person of the foundation pit. The foundation pit deformation monitoring device has the effect of monitoring foundation pit deformation constantly.
Description
Technical Field
The application relates to the technical field of foundation pit monitoring, in particular to a method and a system for monitoring foundation pit deformation in real time.
Background
The measures of soil retaining structure, underground water control, environmental protection and the like required for ensuring the safety and stability of the underground space formed by downward excavation of the ground during the construction of the underground structure are called foundation pit engineering.
If the foundation pit deforms in the foundation pit engineering, the foundation pit deformation is often the prelude of the trend disaster behavior, and therefore monitoring of the foundation pit deformation is particularly important for guaranteeing the safety of the foundation pit construction process. Most of foundation pit deformation is caused by displacement of the enclosure structure under the action of internal and external pressure difference due to excavation and unloading in the pit, so that the deformation of the soil body outside the enclosure structure is caused, and the settlement and movement of the soil body outside the foundation pit or a building (structure) are caused. In the process of foundation pit construction, the deformation of the foundation pit is monitored usually in a manual measurement mode, and when an important node is constructed in the process of construction, a technician measures various index data of the foundation pit by using a measuring instrument and analyzes whether the deformation of the foundation pit occurs according to a measurement result.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: the deformation of the foundation pit needs to be monitored manually, the foundation pit needs to be measured, calculated and analyzed, and more time and labor are consumed in the measurement, calculation and analysis processes, so that the deformation of the foundation pit is difficult to monitor constantly.
Disclosure of Invention
In order to overcome the defect that the deformation of a foundation pit is difficult to monitor constantly, the application provides a method and a system for monitoring the deformation of the foundation pit in real time.
In a first aspect, the present application provides a method for monitoring deformation of a foundation pit in real time, including the steps of:
acquiring field surveying and mapping data of a foundation pit;
constructing a three-dimensional model of the foundation pit by using a BIM system and based on the field mapping data;
respectively arranging a plurality of reference points in each plane of the foundation pit;
generating model reference points at corresponding locations in the three-dimensional model based on the locations of the reference points;
performing construction simulation on the three-dimensional model by using the BIM system based on a preset foundation pit construction plan to respectively obtain simulation change tracks of the model reference points;
generating actual change tracks of all reference points in the foundation pit according to the foundation pit construction plan;
and monitoring the deformation condition of the foundation pit by combining the actual change track and the simulated change track, and sending warning information to a responsible person of the foundation pit if the deformation condition occurs.
By adopting the technical scheme, the three-dimensional model is constructed in the BIM system through the field mapping data of the foundation pit, the reference point is set in the actual foundation pit, the model reference point is generated at the corresponding position in the three-dimensional model, the foundation pit construction plan is guided into the BIM system to simulate the construction of the three-dimensional model, so that the simulated change track of the model reference point is obtained, information is collected in the actual construction process of the foundation pit, the actual change track of the reference point is generated, the deformation condition of the foundation pit can be monitored by comparing the actual change track and the simulated change track, and when the deformation condition is monitored, a warning is sent to a foundation pit responsible person in time, so that the responsible person can make emergency treatment in time.
Optionally, the generating a model reference point at a corresponding position in the three-dimensional model based on the position of the reference point includes the following steps:
constructing a space coordinate axis by taking any one reference point as an origin;
calculating the space coordinates of the origin and all reference points according to the field mapping data;
generating corresponding space vectors for all reference points except the origin on the basis of the origin, the space coordinate axis and the space coordinate;
importing all space vectors of the space coordinates of the origin into the BIM system;
generating a model reference point corresponding to the origin in the three-dimensional model through the BIM system based on the space coordinate of the origin, and constructing a simulation space coordinate axis;
and analyzing all the space vectors through the BIM system, and generating model reference points corresponding to all the space vectors in the three-dimensional model.
By adopting the technical scheme, one reference point is selected as an origin to construct a space coordinate axis, space coordinates and space vectors of all the reference points are obtained according to field mapping data, and model reference points and simulation space coordinate axes corresponding to the origin are generated in the three-dimensional model according to the space coordinates of the origin through the BIM system.
Optionally, the performing construction simulation on the three-dimensional model by using the BIM system based on the preset foundation pit construction plan to obtain the simulation change trajectory of each model reference point respectively includes the following steps:
retrieving the foundation pit construction plan according to preset data keywords to obtain construction data;
importing the construction data into the BIM system, and performing construction simulation on the three-dimensional model through the BIM system;
acquiring space variation parameters of all model reference points;
generating a simulated variation trajectory of the model reference point based on the spatial variation parameter.
By adopting the technical scheme, the BIM system is utilized to carry out construction simulation on the foundation pit construction plan, and the change in the three-dimensional model belongs to the normal change in the construction process, so that the spatial change parameters of all model reference points are obtained through the BIM system, and then the simulation change track is generated according to the spatial change parameters, and is all displacements of the simulation reference points in the normal construction process.
Optionally, the generating the actual change trajectories of all the reference points in the foundation pit according to the foundation pit construction plan includes the following steps:
deploying a plurality of camera devices based on the positions of all the reference points in the foundation pit;
acquiring real-time video images of all the camera devices when the foundation pit construction plan is shot;
marking all reference points in the real-time video image;
and respectively generating actual change tracks of all reference points according to the real-time video images.
By adopting the technical scheme, the camera equipment is adopted to collect real-time video images of all reference points during foundation pit construction, and then the reference points are marked, so that actual change tracks of all the reference points can be generated from the real-time video images, and the actual change tracks are all displacements of the reference points in the actual construction process.
Optionally, the monitoring the deformation condition of the foundation pit by combining the actual change trajectory and the simulated change trajectory includes the following steps:
comparing the simulated change track with the actual change track to obtain the offset of the actual change track;
acquiring weather information in the foundation pit construction period, and configuring an offset threshold according to the weather information;
judging whether the offset exceeds the offset threshold value;
if the offset exceeds the offset threshold, monitoring that the foundation pit is deformed;
and if the offset does not exceed the offset threshold, monitoring that the foundation pit is not deformed.
By adopting the technical scheme, the simulation change track is the displacement embodiment of the model reference point in the construction process according to the foundation pit construction plan, and the actual change track is the displacement embodiment of the reference point in the foundation pit in the actual construction process, so that the offset is obtained by comparing the simulation change track and the actual change track, whether the offset exceeds the offset threshold value is judged, and if the offset exceeds the threshold value, the foundation pit has the deformation condition outside the construction plan. The configuration of the offset threshold value needs to refer to the weather in the foundation pit construction period, and when rainfall in the foundation pit construction period is more, the foundation pit construction is more easily affected, so that the offset threshold value needs to be reduced when the rainfall is more.
Optionally, the step of comparing the simulated variation trajectory with the actual variation trajectory to obtain the offset of the actual variation trajectory includes the following steps:
carrying out coincidence comparison on the simulated change track and the actual change track;
judging whether the actual change track is coincident with the simulated change track or not;
if the actual change track and the simulated change track are overlapped, the offset of the actual change track is 0;
if the actual change track is not overlapped with the simulated change track, calculating the track length of the actual change track which is not overlapped with the simulated change track;
setting a plurality of first measuring points in the non-coincident track of the simulated change track according to the track length;
respectively arranging a plurality of second measuring points at positions corresponding to the plurality of first measuring points in the non-coincident track of the actual change track;
respectively calculating the Euclidean distance between each first measuring point and the corresponding second measuring point;
and calculating the average value of all Euclidean distances to obtain the offset of the actual change track.
By adopting the technical scheme, the deviation judgment is carried out by carrying out coincidence comparison on the simulated change track and the actual change track, if the actual change track is always coincident with the simulated change track, the actual change track is not deviated, and the deviation amount is 0; if the actual changing track and the simulated changing track have non-coincident tracks, the offset of the actual changing track needs to be calculated according to the non-coincident tracks of the actual changing track and the simulated changing track and the track length.
Optionally, the obtaining of the weather information in the foundation pit construction period and configuring the offset threshold according to the weather information include the following steps:
retrieving the foundation pit construction plan according to preset information keywords to obtain foundation pit position information and construction time information;
acquiring the total rainfall duration in the foundation pit construction period through a meteorological system based on the foundation pit position information and the construction time information;
calculating the rainfall duration ratio in the foundation pit construction period according to the total rainfall duration and the construction time information;
judging whether the rainfall duration ratio exceeds a preset duration ratio threshold value or not;
if the rainfall duration ratio exceeds a preset duration ratio threshold, configuring a first offset threshold;
and if the rainfall duration ratio does not exceed a preset duration ratio threshold, configuring a second offset threshold, wherein the second offset threshold is greater than the first offset threshold.
By adopting the technical scheme, the position information and the construction time information of the foundation pit are obtained through the foundation pit construction plan, the weather information of the position of the foundation pit in the construction period of the foundation pit is obtained through the weather system, the proportion of rainfall time in the total construction time of the foundation pit is calculated according to the total rainfall duration obtained in the weather information, when the proportion of the rainfall duration exceeds the proportion threshold, rainfall is more in the construction period of the foundation pit, and at the moment, a first offset threshold with a smaller threshold needs to be configured; when the rainfall time proportion does not exceed the proportion threshold, it is indicated that the rainfall is less in the foundation pit construction period, a second offset threshold with a larger threshold can be configured, and the smaller the offset threshold is, the higher the monitoring precision of the offset is.
In a second aspect, the present application further provides a real-time monitoring system for deformation of a foundation pit, including:
the data acquisition terminal is used for acquiring field mapping data of the foundation pit;
the track acquisition module is used for generating an actual change track of a reference point in the foundation pit in the construction process of the foundation pit and is connected with the BIM system to acquire a simulated change track generated by the BIM system, and the simulated change track is generated in the construction simulation process through the model reference point;
the monitoring module is connected with the track acquisition module to receive the actual change track and the simulated change track, monitors the deformation condition of the foundation pit according to the actual change track and the simulated change track, and sends out warning information if the deformation condition occurs;
and the mobile terminal is held by a responsible person of the foundation pit and is connected with the monitoring module to receive the warning information.
By adopting the technical scheme, the data acquisition terminal is used for acquiring the field surveying and mapping data of the foundation pit and constructing the three-dimensional model in the BIM system, the track acquisition module is used for generating the actual change track of the reference point and acquiring the simulated change track generated by the BIM system in the three-dimensional model, the monitoring module is used for comparing the actual change track and the simulated change track to monitor the deformation condition of the foundation pit, warning information is sent when the deformation condition is monitored, and a person in charge of the foundation pit can receive the warning information through the mobile terminal.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the method comprises the steps of establishing a three-dimensional model in a BIM system through field mapping data of a foundation pit, setting reference points in the actual foundation pit, generating model reference points at corresponding positions in the three-dimensional model, leading a foundation pit construction plan into the BIM system to carry out construction simulation on the three-dimensional model, obtaining a simulation change track of the model reference points, acquiring information in the actual construction process of the foundation pit, generating an actual change track of the reference points, comparing the actual change track with the simulation change track to monitor the deformation condition of the foundation pit, and sending a warning to a foundation pit responsible person in time when the deformation condition is monitored so that the responsible person can carry out emergency treatment in time.
2. Because the simulated change track is embodied by the displacement of the model reference point in the construction process according to the foundation pit construction plan, and the actual change track is embodied by the displacement of the reference point in the foundation pit in the actual construction process, the offset is obtained by comparing the simulated change track with the actual change track, whether the offset exceeds an offset threshold value is judged, and if the offset exceeds the threshold value, the foundation pit is subjected to deformation outside the construction plan. The configuration of the offset threshold value needs to refer to the weather in the foundation pit construction period, and when rainfall in the foundation pit construction period is more, the foundation pit construction is more easily affected, so that the offset threshold value needs to be reduced when the rainfall is more.
Drawings
Fig. 1 is a schematic flow chart of a method for monitoring deformation of a foundation pit in real time according to an embodiment of the present disclosure.
FIG. 2 is a schematic flow chart illustrating generation of model reference points in a three-dimensional model according to an embodiment of the present disclosure.
Fig. 3 is a schematic flow chart of obtaining a simulation change trajectory of a model reference point through a construction simulation according to an embodiment of the present application.
Fig. 4 is a schematic flow chart of generating an actual variation trajectory of the reference point according to an embodiment of the present application.
Fig. 5 is a schematic flowchart of monitoring deformation of a foundation pit by combining an actual change trajectory and a simulated change trajectory according to an embodiment of the present disclosure.
Fig. 6 is a schematic flowchart of obtaining an offset of an actual variation trajectory according to an embodiment of the present application.
Fig. 7 is a flowchart illustrating a configuration of an offset threshold according to weather information according to an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to figures 1-7.
The embodiment of the application discloses a method for monitoring foundation pit deformation in real time.
Referring to fig. 1, the method for monitoring the deformation of the foundation pit in real time comprises the following steps:
and 101, acquiring field mapping data of the foundation pit.
Wherein, can obtain the on-the-spot survey and drawing data of foundation ditch through surveying equipment, on-the-spot survey and drawing data includes foundation ditch degree of depth, foundation ditch area, foundation ditch bank protection slope etc..
And 102, constructing a three-dimensional model of the foundation pit by utilizing the BIM system and based on the field mapping data.
103, a plurality of reference points are provided on each plane of the foundation pit.
Each plane of the foundation pit comprises a foundation pit bottom surface, a foundation pit side surface and the ground around the foundation pit, and the reference points can be arranged in a matrix according to a certain distance.
Model reference points are generated at corresponding locations in the three-dimensional model based on the locations of the reference points 104.
And 105, performing construction simulation on the three-dimensional model by using a BIM system based on a preset foundation pit construction plan to respectively obtain simulation change tracks of the reference points of each model.
And 106, generating actual change tracks of all reference points in the foundation pit according to the foundation pit construction plan.
And 107, monitoring the deformation condition of the foundation pit by combining the actual change track and the simulated change track, and if the deformation condition occurs, sending warning information to a responsible person of the foundation pit.
The implementation principle of the embodiment is as follows:
the method comprises the steps of establishing a three-dimensional model in a BIM system through field mapping data of a foundation pit, setting reference points in the actual foundation pit, generating model reference points at corresponding positions in the three-dimensional model, leading a foundation pit construction plan into the BIM system to carry out construction simulation on the three-dimensional model, obtaining a simulation change track of the model reference points, acquiring information in the actual construction process of the foundation pit, generating an actual change track of the reference points, comparing the actual change track with the simulation change track to monitor the deformation condition of the foundation pit, and sending a warning to a foundation pit responsible person in time when the deformation condition is monitored so that the responsible person can carry out emergency treatment in time.
In step 104 of the embodiment shown in fig. 1, a spatial coordinate axis is constructed according to the reference point and all spatial coordinates and spatial vectors are obtained, and then the same spatial coordinate axis is constructed in the three-dimensional model based on the spatial coordinates, at this time, model reference points corresponding to all reference points can be generated in the three-dimensional model according to the spatial vectors. This is explained in detail with reference to the embodiment shown in fig. 2.
Referring to fig. 2, generating model reference points in a three-dimensional model includes the steps of:
a spatial coordinate axis is constructed with an arbitrary reference point as an origin 201.
Preferably, a reference point close to a corner of the foundation pit is selected as an origin to construct a space coordinate axis, so that calculation of subsequent space coordinates and generation of space vectors are facilitated.
From the field mapping data, the spatial coordinates of the origin and all reference points are calculated 202.
The actual distances from all the reference points to the original point can be obtained according to the field mapping data, and then the space coordinates of all the reference points are obtained according to the actual distances, wherein the space coordinates of the original point are (0, 0, 0').
And 203, generating corresponding space vectors for all the reference points except the origin on the basis of the origin, the space coordinate axis and the space coordinate.
The space vector of the origin is a zero vector, and the space vectors of all other reference points indicate the distance from the reference point to the origin and the direction in which the origin points to the reference point.
And 204, importing all the space vectors of the space coordinates of the origin into the BIM system.
And 205, generating a model reference point corresponding to the origin in the three-dimensional model through the BIM system based on the space coordinate of the origin, and constructing a simulation space coordinate axis.
206, all the space vectors are analyzed by the BIM system, and model reference points corresponding to all the space vectors are generated in the three-dimensional model.
The implementation principle of the embodiment is as follows:
selecting a reference point as an origin to construct a space coordinate axis, acquiring space coordinates and space vectors of all the reference points according to field mapping data, and generating model reference points and simulation space coordinate axes corresponding to the origin in a three-dimensional model according to the space coordinates of the origin through a BIM system.
In step 105 of the embodiment shown in fig. 1, a BIM system may be used to perform a foundation pit construction simulation according to a foundation pit construction plan, a model reference point may be displaced during the simulation process, and a simulation change trajectory of the model reference point may be generated by collecting spatial change parameters of the model reference point. This is explained in detail with reference to the embodiment shown in fig. 3.
Referring to fig. 3, obtaining a simulation change trajectory of a model reference point through a construction simulation includes the steps of:
301, retrieving the foundation pit construction plan according to the preset data keywords to obtain construction data.
The data keywords can be earth excavation amount and earth backfill amount, and specific earth excavation value and excavation position, earth backfill value and backfill position in the foundation pit construction plan are searched according to the data keywords.
302, importing the construction data into a BIM system, and performing construction simulation on the three-dimensional model through the BIM system.
303, obtaining the space variation parameters of all model reference points.
The space variation parameter is a variation value of the model reference point on each coordinate axis in the simulation space coordinate axes.
A simulated variation trajectory for the model reference point is generated based on the spatially varying parameters 304.
The implementation principle of the embodiment is as follows:
and (3) carrying out construction simulation on the foundation pit construction plan by using the BIM system, wherein the change in the three-dimensional model belongs to normal change in the construction process, so that spatial change parameters of all model reference points are obtained by the BIM system, and then a simulation change track is generated according to the spatial change parameters, wherein the simulation change track is all displacements of the simulation reference points in the normal construction process.
In step 106 of the embodiment shown in fig. 1, during the actual construction of the foundation pit, a video image of all the reference points during the actual construction may be captured by using a camera device, and the actual change trajectory of the reference points may be generated according to the video image. This is explained in detail with reference to the embodiment shown in fig. 4.
Referring to fig. 4, generating the actual variation trajectory of the reference point includes the steps of:
and 401, arranging a plurality of camera devices at the positions of the foundation pit based on all the reference points.
If one camera device is deployed, an unmanned aerial vehicle with a high-definition camera can be adopted, and shooting is carried out above the central point of the bottom surface of the foundation pit in a rotary shooting mode; if a plurality of camera devices are deployed, a plurality of high-definition cameras can be respectively deployed around the foundation pit to shoot.
And 402, acquiring real-time video images of all the camera devices when the foundation pit construction plan is shot.
All reference points are marked in the live video image 403.
Wherein, all reference points can be marked by adopting a special color different from the actual color of the foundation pit.
And 404, generating actual changing tracks of all the reference points according to the real-time video images.
The positions of the reference points in the real-time video image are captured frame by frame, and the captured positions are connected into a line to obtain the actual change track of the reference points.
The implementation principle of the embodiment is as follows:
the method comprises the steps of collecting real-time video images of all reference points during foundation pit construction by adopting camera equipment, and marking the reference points, so that actual change tracks of all the reference points can be generated from the real-time video images, wherein the actual change tracks are all displacements of the reference points in an actual construction process.
In step 107 of the embodiment shown in fig. 1, an offset is obtained by comparing the simulated variation track and the actual variation track, and then it is determined whether the offset exceeds an offset threshold to determine whether the foundation pit is deformed. This is explained in detail with reference to the embodiment shown in fig. 5.
Referring to fig. 5, the monitoring of the deformation condition of the foundation pit by combining the actual change trajectory and the simulated change trajectory comprises the following steps:
and 501, comparing the simulated change track with the actual change track to obtain the offset of the actual change track.
502, acquiring weather information in a foundation pit construction period, and configuring an offset threshold according to the weather information.
503, determining whether the offset exceeds an offset threshold, if yes, executing step 504; if not, go to step 505.
And 504, monitoring the deformation condition of the foundation pit.
And 505, monitoring that the foundation pit is not deformed.
The implementation principle of the embodiment is as follows:
because the simulated change track is embodied by the displacement of the model reference point in the construction process according to the foundation pit construction plan, and the actual change track is embodied by the displacement of the reference point in the foundation pit in the actual construction process, the offset is obtained by comparing the simulated change track with the actual change track, whether the offset exceeds an offset threshold value is judged, and if the offset exceeds the threshold value, the foundation pit is subjected to deformation outside the construction plan. The configuration of the offset threshold value needs to refer to the weather in the foundation pit construction period, and when rainfall in the foundation pit construction period is more, the foundation pit construction is more easily affected, so that the offset threshold value needs to be reduced when the rainfall is more.
In step 501 of the embodiment shown in fig. 5, the simulated variation trajectory and the actual variation trajectory are subjected to superposition comparison to determine whether a deviation occurs, if a deviation occurs, a measurement point is set in the deviation trajectory, and an average value of euclidean distances between the deviation trajectories is calculated to obtain the deviation amount. This is explained in detail with reference to the embodiment shown in fig. 6.
Referring to fig. 6, obtaining the offset of the actual variation trajectory includes the following steps:
601, carrying out coincidence comparison on the simulation change track and the actual change track.
The starting points of the simulated change track and the actual change track are overlapped, and the initial directions of the simulated change track and the actual change track are kept consistent.
602, judging whether the actual variation track is coincident with the simulation variation track, if so, executing step 603; if not, go to step 604.
603, the offset of the actual variation locus is 0.
And 604, calculating the track length of the track where the actual change track and the simulated change track are not overlapped.
The method comprises the steps of setting calculation nodes at two ends of a non-coincident track, densely setting a plurality of calculation nodes on the non-coincident track, respectively calculating the distance between any two adjacent calculation nodes according to the space coordinates of the calculation nodes, and enabling the sum of the calculated distances to be approximate to the track length of the non-coincident track.
605, a plurality of first measurement points are set in the non-coincident trajectory of the simulated variation trajectory according to the trajectory length.
The longer the track length is, the more first measuring points need to be set, and conversely, the shorter the track length is, the fewer first measuring points are set.
And 606, respectively arranging a plurality of second measuring points at positions corresponding to the plurality of first measuring points in the non-overlapped track of the actual change track.
607, respectively calculating the Euclidean distance between each first measuring point and the corresponding second measuring point.
Wherein, the Euclidean distance is calculated by the space coordinates of the first measuring point and the second measuring point, and if the space coordinate of the first measuring point is (x, y, z) and the space coordinate of the second measuring point is (a, b, c), the Euclidean distance between the two points is (x, y, z)
。
And 608, calculating the average value of all Euclidean distances to obtain the offset of the actual change track.
The implementation principle of the embodiment is as follows:
carrying out deviation judgment by carrying out coincidence comparison on the simulated change track and the actual change track, wherein if the actual change track is always coincident with the simulated change track, the actual change track is not deviated, and the deviation amount is 0; if the actual changing track and the simulated changing track have non-coincident tracks, the offset of the actual changing track needs to be calculated according to the non-coincident tracks of the actual changing track and the simulated changing track and the track length.
In step 502 of the embodiment shown in fig. 5, the amount of rainfall time in the construction time period is determined according to the weather information, and if the rainfall time is long, a small offset threshold needs to be configured; a larger offset threshold may be configured if the length of rainfall is less. This is explained in detail with reference to the embodiment shown in fig. 7.
Referring to fig. 7, configuring the offset threshold according to the weather information includes the steps of:
701, retrieving a foundation pit construction plan according to preset information keywords to obtain foundation pit position information and construction time information.
The information keywords comprise the position of the foundation pit and the construction time.
And 702, acquiring the total rainfall duration in the foundation pit construction period through a meteorological system based on the foundation pit position information and the construction time information.
The method comprises the steps of firstly establishing communication connection with a meteorological system, then retrieving the location of a foundation pit through foundation pit position information, obtaining a weather forecast of the location of the foundation pit within a construction time period, and calculating the total rainfall duration within the construction time period of the foundation pit according to the weather forecast.
703, calculating the rainfall duration ratio in the foundation pit construction period according to the total rainfall duration and the construction time information.
And dividing the total rainfall time by the total construction time to obtain the rainfall time ratio in the foundation pit construction period.
704, judging whether the rainfall duration ratio exceeds a preset duration ratio threshold, if so, executing step 705; if not, go to step 706.
A first offset threshold is configured 705.
A second offset threshold is configured 706.
Wherein the second offset threshold is greater than the first offset threshold.
The implementation principle of the embodiment is as follows:
acquiring position information and construction time information of a foundation pit through a foundation pit construction plan, acquiring weather information of the position of the foundation pit in a foundation pit construction period through a weather system, calculating the proportion of rainfall time in the total construction time of the foundation pit according to the total rainfall duration acquired in the weather information, and when the proportion of the rainfall time exceeds a proportion threshold value, indicating that rainfall is more in the foundation pit construction period, and configuring a first offset threshold value with a smaller threshold value; when the rainfall time proportion does not exceed the proportion threshold, it is indicated that the rainfall is less in the foundation pit construction period, a second offset threshold with a larger threshold can be configured, and the smaller the offset threshold is, the higher the monitoring precision of the offset is.
The embodiment of the application still discloses a foundation ditch deformation real-time monitoring system, includes:
the data acquisition terminal is used for acquiring field mapping data of the foundation pit;
the track acquisition module is used for generating an actual change track of a reference point in the foundation pit in the construction process of the foundation pit, and is connected with the BIM system to acquire a simulated change track generated by the BIM system, and the simulated change track is generated in the construction simulation process through the model reference point;
the monitoring module is connected with the track acquisition module to receive the actual change track and the simulated change track, monitors the deformation condition of the foundation pit according to the actual change track and the simulated change track, and sends out warning information if the deformation condition occurs;
and the mobile terminal is held by a person in charge of the foundation pit and is connected with the monitoring module to receive the warning information.
The implementation principle of the embodiment is as follows:
the method comprises the steps that field surveying and mapping data of the foundation pit are collected through a data collection terminal, a three-dimensional model is built in a BIM system, an actual change track of a reference point is generated through a track acquisition module, a simulated change track generated by the BIM system in the three-dimensional model is acquired, a monitoring module can monitor the deformation condition of the foundation pit by combining the actual change track and the simulated change track to compare, warning information is sent out when the deformation condition is monitored, and a person in charge of the foundation pit can receive the warning information through a mobile terminal.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A method for monitoring foundation pit deformation in real time is characterized by comprising the following steps:
acquiring field surveying and mapping data of a foundation pit;
constructing a three-dimensional model of the foundation pit by using a BIM system and based on the field mapping data;
respectively arranging a plurality of reference points in each plane of the foundation pit;
generating model reference points at corresponding locations in the three-dimensional model based on the locations of the reference points;
performing construction simulation on the three-dimensional model by using the BIM system based on a preset foundation pit construction plan to respectively obtain simulation change tracks of the model reference points;
generating actual change tracks of all reference points in the foundation pit according to the foundation pit construction plan;
and monitoring the deformation condition of the foundation pit by combining the actual change track and the simulated change track, and sending warning information to a responsible person of the foundation pit if the deformation condition occurs.
2. The method for monitoring the deformation of the foundation pit in real time according to claim 1, wherein the step of generating model reference points at corresponding positions in the three-dimensional model based on the positions of the reference points comprises the following steps:
constructing a space coordinate axis by taking any one reference point as an origin;
calculating the space coordinates of the origin and all reference points according to the field mapping data;
generating corresponding space vectors for all reference points except the origin on the basis of the origin, the space coordinate axis and the space coordinate;
importing all space vectors of the space coordinates of the origin into the BIM system;
generating a model reference point corresponding to the origin in the three-dimensional model through the BIM system based on the space coordinate of the origin, and constructing a simulation space coordinate axis;
and analyzing all the space vectors through the BIM system, and generating model reference points corresponding to all the space vectors in the three-dimensional model.
3. The method for monitoring the deformation of the foundation pit in real time according to claim 1, wherein the step of performing construction simulation on the three-dimensional model by using the BIM system based on a preset foundation pit construction plan to respectively obtain the simulation change track of each model reference point comprises the following steps:
retrieving the foundation pit construction plan according to preset data keywords to obtain construction data;
importing the construction data into the BIM system, and performing construction simulation on the three-dimensional model through the BIM system;
acquiring space variation parameters of all model reference points;
generating a simulated variation trajectory of the model reference point based on the spatial variation parameter.
4. The method for monitoring the deformation of the foundation pit in real time according to the claim 1, wherein the step of generating the actual change tracks of all the reference points in the foundation pit according to the foundation pit construction plan comprises the following steps:
deploying a plurality of camera devices based on the positions of all the reference points in the foundation pit;
acquiring real-time video images of all the camera devices when the foundation pit construction plan is shot;
marking all reference points in the real-time video image;
and respectively generating actual change tracks of all reference points according to the real-time video images.
5. The method for monitoring the deformation of the foundation pit in real time according to claim 1, wherein the step of monitoring the deformation condition of the foundation pit by combining the actual change trajectory and the simulated change trajectory comprises the following steps:
comparing the simulated change track with the actual change track to obtain the offset of the actual change track;
acquiring weather information in the foundation pit construction period, and configuring an offset threshold according to the weather information;
judging whether the offset exceeds the offset threshold value;
if the offset exceeds the offset threshold, monitoring that the foundation pit is deformed;
and if the offset does not exceed the offset threshold, monitoring that the foundation pit is not deformed.
6. The method for monitoring the deformation of the foundation pit in real time according to claim 5, wherein the step of comparing the simulated change track with the actual change track to obtain the offset of the actual change track comprises the following steps:
carrying out coincidence comparison on the simulated change track and the actual change track;
judging whether the actual change track is coincident with the simulated change track or not;
if the actual change track and the simulated change track are overlapped, the offset of the actual change track is 0;
if the actual change track is not overlapped with the simulated change track, calculating the track length of the actual change track which is not overlapped with the simulated change track;
setting a plurality of first measuring points in the non-coincident track of the simulated change track according to the track length;
respectively arranging a plurality of second measuring points at positions corresponding to the plurality of first measuring points in the non-coincident track of the actual change track;
respectively calculating the Euclidean distance between each first measuring point and the corresponding second measuring point;
and calculating the average value of all Euclidean distances to obtain the offset of the actual change track.
7. The method for monitoring the deformation of the foundation pit in real time according to claim 5, wherein the step of acquiring the weather information in the construction period of the foundation pit and configuring the offset threshold according to the weather information comprises the following steps:
retrieving the foundation pit construction plan according to preset information keywords to obtain foundation pit position information and construction time information;
acquiring the total rainfall duration in the foundation pit construction period through a meteorological system based on the foundation pit position information and the construction time information;
calculating the rainfall duration ratio in the foundation pit construction period according to the total rainfall duration and the construction time information;
judging whether the rainfall duration ratio exceeds a preset duration ratio threshold value or not;
if the rainfall duration ratio exceeds a preset duration ratio threshold, configuring a first offset threshold;
and if the rainfall duration ratio does not exceed a preset duration ratio threshold, configuring a second offset threshold, wherein the second offset threshold is greater than the first offset threshold.
8. A real-time monitoring system for deformation of a foundation pit, which adopts the real-time monitoring method for deformation of the foundation pit as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
the data acquisition terminal is used for acquiring field mapping data of the foundation pit;
the track acquisition module is used for generating an actual change track of a reference point in the foundation pit in the construction process of the foundation pit and is connected with the BIM system to acquire a simulated change track generated by the BIM system, and the simulated change track is generated in the construction simulation process through the model reference point;
the monitoring module is connected with the track acquisition module to receive the actual change track and the simulated change track, monitors the deformation condition of the foundation pit according to the actual change track and the simulated change track, and sends out warning information if the deformation condition occurs;
and the mobile terminal is held by a responsible person of the foundation pit and is connected with the monitoring module to receive the warning information.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115574732A (en) * | 2022-12-08 | 2023-01-06 | 北京新兴环宇信息科技有限公司 | Foundation pit detection method and detection system |
| CN115574732B (en) * | 2022-12-08 | 2023-03-10 | 北京新兴环宇信息科技有限公司 | Foundation pit detection method and detection system |
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