CN113720382A - Dynamic inverse analysis calculation and fusion algorithm based intelligent monitoring system - Google Patents
Dynamic inverse analysis calculation and fusion algorithm based intelligent monitoring system Download PDFInfo
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Abstract
The invention provides a dynamic inverse analysis calculation and fusion algorithm-based and intelligent monitoring system, which comprises the following steps of monitoring horizontal displacement of a deep layer of an underground continuous wall in real time by using an omnidirectional real-time displacement pipe, collecting acceleration and corner data of the wall at each measuring point in the underground continuous wall, and obtaining the horizontal displacement of each point of the wall relative to the top end by using a STRDAL algorithm; the monitoring platform collects various data measured by the omnidirectional real-time displacement pipe; solving and deriving a horizontal displacement curve; fitting a deep horizontal displacement curve into a unitary multiple equation through mapping software; and obtaining the soil pressure at any depth behind the wall by utilizing the inversion analysis of the dynamic soil pressure. The invention can realize real-time continuous monitoring, is flexible and convenient to use, has high measurement precision, better economy, higher safety and more accurate predictability, and the dynamic inverse analysis calculation and fusion algorithm have important significance for scientific research in foundation pit engineering.
Description
Technical Field
The invention relates to a dynamic inverse analysis calculation and fusion algorithm based intelligent monitoring system, and belongs to the technical field of foundation pit monitoring.
Background
In recent years, buildings and structures such as subway stations and inter-section tunnels have been developed vigorously. In order to meet the construction requirements of the buildings and structures, the excavation depth of a foundation pit is increased firstly, and the excavation scale of the foundation pit is enlarged, so that ultra-deep foundation pits emerge continuously, the problem of deep foundation pits is increased continuously, and the ultra-deep foundation pits become one of the main research contents of geotechnical engineering in modern city construction gradually. Nowadays, such ultra-deep foundation pits of the shield working well are frequently available, and have very strict requirements on the real-time performance and accuracy of foundation pit monitoring. The traditional foundation pit monitoring technology depends on manual measurement, and has the problems of low monitoring precision, untimely monitoring time, low monitoring efficiency and the like, so that the requirement of continuous monitoring cannot be met.
In addition, the method is particularly important for monitoring horizontal displacement, inner support, soil pressure and the like of deep layers in ultra-deep foundation pits of the shield working well. The traditional measurement adopts manual data acquisition, the efficiency of data acquisition and transmission is low, the time interval of data acquisition is longer, and the accumulated error is increased continuously. Once the accumulated error exceeds the threshold value, the construction of the working well structure is influenced, and the construction period of subsequent engineering is also interfered. Therefore, the dynamic information of the foundation pit cannot be mastered in real time, so that corresponding measures cannot be taken to process the abnormal foundation pit at the first time, the opportunity for processing the problems is delayed, and construction safety accidents are easily caused.
Disclosure of Invention
The invention aims to provide a dynamic inverse analysis-based calculation and fusion algorithm and an intelligent monitoring system, which have overwhelming advantages in real time, predictability, accuracy, safety and economy.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention provides an intelligent shield working well foundation pit monitoring system based on software and hardware fusion, and real-time monitoring data of thirteen monitoring projects can be transmitted to an intelligent monitoring platform.
The thirteen monitoring items capable of transmitting the real-time data to the intelligent monitoring platform comprise:
deformation of the underground diaphragm wall; the internal force of the underground continuous wall; horizontally displacing and vertically displacing the wall top of the underground continuous wall; settling the earth surface; the ground water level; supporting the axial force; horizontal displacement and vertical displacement of the upright post structure; the soil pressure; building inclination and settlement; horizontal displacement and vertical displacement of the underground pipeline; pore water pressure; the pit bottom is raised; and (5) converging the wellhead.
The foundation pit supporting structure comprises concrete supports, steel supports, stand columns, underground continuous walls, waist beams, steel purlins and crown beams.
An intelligent shield working well foundation pit monitoring system based on software and hardware fusion comprises a data acquisition system and an intelligent monitoring platform, wherein the data acquisition system is an omnidirectional real-time displacement pipe, an axial force meter and a reinforcing steel bar meter combined data acquisition system based on dynamic inverse analysis calculation and fusion algorithm.
The construction response data acquisition device in the data acquisition system comprises:
the underground diaphragm wall deformation collecting device, the underground diaphragm wall stress collecting device, the wall top displacement collecting device, the supporting shaft force collecting device, the stand column displacement collecting device, the underground diaphragm wall rear soil body deformation collecting device, the building deformation collecting device, the underground pipeline displacement collecting device, the pore water pressure collecting device, the pit bottom uplift collecting device and the well mouth convergence collecting device.
The dynamic inverse analysis calculation and fusion algorithm developed by the shield working well in the intelligent monitoring system is the basis for intelligent monitoring of the data acquisition system.
The utility model provides a shield constructs intelligent monitoring system of working well foundation pit based on software and hardware fuses, specifically includes:
1) an omnidirectional real-time displacement tube, axial force meter and reinforcing steel bar meter combined data acquisition system based on dynamic inverse analysis calculation and fusion algorithm.
2) A wired transmission device.
3) An automated safety information monitoring platform.
The omnidirectional real-time displacement pipe based on the dynamic inverse analysis calculation and fusion algorithm can monitor the deep horizontal displacement of the underground continuous wall in real time, each measuring point in the pipe collects data such as acceleration and rotation angle of the wall, and the horizontal displacement of each point of the wall relative to the top end is obtained by using the STRDAL patent algorithm (based on software and hardware real-time interaction algorithm, CN 105677983A).
The omnidirectional real-time displacement tube based on the dynamic inverse analysis calculation and fusion algorithm can be spliced automatically according to the height of a structure, is convenient and flexible to use, collects data every five minutes, and can realize continuous monitoring of the data.
The omnidirectional real-time displacement tube based on the dynamic inverse analysis calculation and fusion algorithm can be a tandem rod-shaped sensor developed aiming at monitoring deformation of a foundation pit supporting structure in engineering, and the sensor directly transmits calculated transverse displacement data of the monitoring tube to an intelligent monitoring platform by utilizing a mobile internet of things.
The axial force meter based on the dynamic inverse analysis calculation and fusion algorithm can be used for monitoring the stress condition of the steel support in real time so as to adjust the magnitude of the support axial force at any time and control the deformation of the enclosure structure.
The reinforcing steel bar meter based on the dynamic inverse analysis calculation and fusion algorithm is used for measuring the stress of reinforcing steel bars in a concrete support and synchronously measuring the temperature of the reinforcing steel bars.
The algorithm based on dynamic inverse analysis calculation and fusion specifically comprises the following steps:
1) the omnidirectional real-time displacement pipe can monitor the horizontal displacement of the deep layer of the underground diaphragm wall in real time, each measuring point in the pipe can collect data such as acceleration, a corner and the like of the wall, and the horizontal displacement of each point of the wall relative to the top end is obtained by utilizing the STRDAL patent algorithm.
2) The basic method of soil pressure inversion: the total soil pressure is equal to the sum of the soil bearing pressure of the underground continuous wall and the soil bearing pressure of the support, wherein the soil bearing pressure of the underground continuous wall can be obtained by inverting a horizontal displacement curve of a deep layer of the underground continuous wall generated by the intelligent monitoring platform, and the soil bearing pressure of the support can be obtained by monitoring devices such as a reinforcing bar meter, an axial force meter and the like.
3) In the excavation process of a foundation pit supported by an underground continuous wall and an inner support, the vertical direction is generally only under the action of self gravity, the underground continuous wall is considered according to a pure bending component in the inversion process, and the deformation deflection curve equation of the underground continuous wall meets the following formula (1) by referring to an elastic foundation beam model:
wherein p (x) is the load distributed on the soil-back side of the underground continuous wall; and q (x) is the load distributed on the soil facing side of the underground diaphragm wall.
4) The supporting beam is considered according to the elastic homogeneous material, and is assumed to be obtained by the flat section of the pure bending member beam in the mechanics of materials, and the deformation y (x) of each section on the beam and the load distribution concentration satisfy the formula (2):
wherein EI is the cross-sectional bending stiffness of the beam; y (x) is an equation of a deep horizontal displacement curve of the underground continuous wall; and x is the vertical coordinate of the underground continuous wall.
5) The horizontal soil pressure q (x) corresponding to the elastic bending deformation of the underground continuous wall structure can be calculated through the inclinometry displacement of the underground continuous wall, so that the soil pressure on the soil facing side of the underground continuous wall is estimated, see the formula (3)
6) And fitting a deep horizontal displacement curve into a one-dimensional multiple equation through mapping software, substituting the equation into the equations (1), (2) and (3), obtaining the soil pressure of the soil facing side of the underground diaphragm wall, and then obtaining the combined supporting soil pressure at a certain depth by the sum of the soil pressure born by the underground diaphragm wall and the support.
The utility model provides a shield constructs intelligent monitoring system of working well foundation pit based on software and hardware fuses, the axial force, the soil pressure of this system prediction can be according to the axial force, the soil pressure of follow-up monitoring continuously proofreading under certain operating mode, make further prediction more accurate.
The invention has the advantages that: the intelligent shield working well foundation pit monitoring system with the software and hardware integrated function can automatically acquire data and master foundation pit dynamic information in real time, and on the other hand, acquired deep horizontal displacement monitoring data are fed back to an intelligent monitoring platform to form a real-time displacement change curve. Compared with the traditional foundation pit monitoring method, the system has overwhelming advantages in real-time performance, predictability, accuracy, safety and economy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is an example of a three-dimensional offset plot generated by an engineering intelligent monitoring platform according to the present invention.
Fig. 2 is a plan layout diagram of monitoring points of a shield working well in a certain project according to the present invention.
FIG. 3 is a flow chart of a dynamic inverse analysis calculation and fusion algorithm according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will be described in detail with reference to the accompanying drawings and an example of a shield working well in a certain project. The following examples are merely provided to more clearly illustrate the technical solutions of the present invention, and therefore, are only examples, and are not intended to limit the practical scope of the present invention.
The invention provides an intelligent shield working well foundation pit monitoring system based on software and hardware fusion, wherein real-time monitoring data of thirteen monitoring projects can be transmitted to an intelligent monitoring platform, and the platform can reflect data change in the form of a three-dimensional offset curve and the like or generate a displacement cloud chart and the like so as to more visually reflect the construction response of a supporting structure. An example of a three-dimensional offset plot generated by an intelligent monitoring platform is shown in figure 1,
fig. 2 is a plan view of monitoring points of a shield working well in a certain project, which includes thirteen monitoring items.
The thirteen monitoring items capable of transmitting the real-time data to the intelligent monitoring platform comprise:
deformation of the underground diaphragm wall; the internal force of the underground continuous wall; horizontally displacing and vertically displacing the wall top of the underground continuous wall; settling the earth surface; the ground water level; supporting the axial force; horizontal displacement and vertical displacement of the upright post structure; the soil pressure; building inclination and settlement; horizontal displacement and vertical displacement of the underground pipeline; pore water pressure; the pit bottom is raised; and (5) converging the wellhead.
An intelligent shield working well foundation pit monitoring system based on software and hardware fusion comprises a data acquisition system and an intelligent monitoring platform, wherein the data acquisition system is an omnidirectional real-time displacement pipe, an axial force meter and a reinforcing steel bar meter combined data acquisition system based on dynamic inverse analysis calculation and fusion algorithm.
The construction response data acquisition device in the data acquisition system comprises:
the underground diaphragm wall deformation collecting device, the underground diaphragm wall stress collecting device, the wall top displacement collecting device, the supporting shaft force collecting device, the stand column displacement collecting device, the underground diaphragm wall rear soil body deformation collecting device, the building deformation collecting device, the underground pipeline displacement collecting device, the pore water pressure collecting device, the pit bottom uplift collecting device and the well mouth convergence collecting device.
The utility model provides a shield constructs intelligent monitoring system of working well foundation pit based on software and hardware fuses, specifically includes:
1) an omnidirectional real-time displacement tube, axial force meter and reinforcing steel bar meter combined data acquisition system based on dynamic inverse analysis calculation and fusion algorithm.
2) A wired transmission device.
3) An automated safety information monitoring platform.
The omnidirectional real-time displacement tube based on the dynamic inverse analysis calculation and fusion algorithm can be a tandem rod-shaped sensor developed aiming at monitoring deformation of a foundation pit supporting structure in engineering, and the sensor directly transmits calculated transverse displacement data of the monitoring tube to an intelligent monitoring platform by utilizing a mobile internet of things.
The omnidirectional real-time displacement tube based on the dynamic inverse analysis calculation and fusion algorithm can be freely spliced according to the height of a structure, is convenient and flexible to use, collects data every five minutes, and can realize continuous monitoring of the data.
The omnidirectional real-time displacement pipe based on the dynamic inverse analysis calculation and fusion algorithm can monitor the deep horizontal displacement of the underground continuous wall in real time, each measuring point in the pipe collects data such as acceleration and rotation angle of the wall, and the horizontal displacement of each point of the wall relative to the top end is obtained by using the STRDAL patent algorithm (algorithm based on software and hardware real-time interaction, CN 105677983A).
The axial force meter based on the dynamic inverse analysis calculation and fusion algorithm can be used for monitoring the stress condition of the steel support in real time, so that the size of the support axial force can be adjusted at any time, and the deformation of the enclosure structure is controlled.
The reinforcing steel bar meter based on the dynamic inverse analysis calculation and fusion algorithm is used for measuring the stress of reinforcing steel bars in a concrete support and synchronously measuring the temperature of the reinforcing steel bars.
A calculation and fusion algorithm based on dynamic inverse analysis is divided into 6 steps.
Step 1, the omnidirectional displacement pipe can monitor the deep horizontal displacement of the underground continuous wall in real time, each measuring point in the omnidirectional displacement pipe can acquire data such as acceleration, a corner and the like of the wall, and the horizontal displacement of each point of the wall relative to the top end is obtained by using a STRDAL patent algorithm.
wherein p (x) is the load distributed on the soil-back side of the underground continuous wall; and q (x) is the load distributed on the soil facing side of the underground diaphragm wall.
Step 4, considering the support beam according to the elastic homogeneous material, supposing that the support beam can be obtained by the plane section of the pure bending member beam in the mechanics of materials, and the deformation y (x) of each section on the beam and the load distribution density satisfy the formula (2):
wherein EI is the cross-sectional bending stiffness of the beam; y (x) is an equation of a deep horizontal displacement curve of the underground continuous wall; and x is the vertical coordinate of the underground continuous wall.
Step 5, calculating the horizontal soil pressure q (x) corresponding to the elastic bending deformation of the underground continuous wall structure through the deep horizontal displacement of the underground continuous wall, and estimating the soil pressure on the soil facing side of the underground continuous wall according to the formula (3)
And 6, fitting a deep horizontal displacement curve into a one-dimensional multiple equation through mapping software, substituting the equation into the equations (1), (2) and (3), obtaining the soil pressure of the soil facing side of the underground continuous wall, and then obtaining the combined supporting soil pressure at a certain depth by the sum of the soil pressure born by the underground continuous wall and the support.
The utility model provides a shield constructs intelligent monitoring system of working well foundation pit based on software and hardware fuses, the axial force, the soil pressure of this system prediction can be according to the axial force, the soil pressure of follow-up monitoring continuously proofreading under certain operating mode, make further prediction more accurate.
The invention relates to an intelligent shield working well pit monitoring system based on software and hardware fusion, which comprises a data acquisition system and an intelligent monitoring platform. The intelligent shield working well foundation pit monitoring system with the software and hardware integrated can automatically acquire data, the acquisition time interval is only 5 minutes, the dynamic information of a foundation pit can be mastered in real time, corresponding measures are taken at the first time when the foundation pit is abnormal, and construction safety accidents are prevented; on the other hand, the collected deep horizontal displacement monitoring data is fed back to the intelligent monitoring platform to form a real-time displacement change curve, and the soil pressure behind the underground diaphragm walls at different depths can be obtained through a dynamic inverse analysis calculation and fusion algorithm, so that the reference is provided for underground engineering design and measurement, and the scientific research in the field of geotechnical engineering is facilitated. Compared with the traditional foundation pit monitoring method, the system has overwhelming advantages in real-time performance, predictability, accuracy, safety and economy.
Claims (8)
1. A calculation and fusion algorithm based on dynamic inverse analysis is characterized by comprising the following specific steps:
1) the horizontal displacement of the deep layer of the underground continuous wall is monitored in real time by using an omnidirectional real-time displacement pipe, the internal measuring points collect data such as acceleration, corner, displacement and the like of the wall, the relative coordinates of the point positions of the underground continuous wall can be provided, and the horizontal displacement of each point of the wall relative to the top end is obtained by using a STRCAL algorithm;
2) the monitoring platform collects various data measured by the omnidirectional real-time displacement pipe;
3) solving and deriving a horizontal displacement curve;
4) fitting a deep horizontal displacement curve into a unitary multiple equation through mapping software;
5) and obtaining the soil pressure at any depth behind the wall by utilizing the inversion analysis of the dynamic soil pressure.
2. The calculation and fusion algorithm based on the dynamic inverse analysis as claimed in claim 1, wherein the basic method of the soil pressure inversion is that the total soil pressure is equal to the sum of the soil pressure borne by the underground continuous wall and the soil pressure borne by the support, wherein the soil pressure borne by the underground continuous wall can be obtained by inversion of a deep horizontal displacement curve of the underground continuous wall engineering, and the soil pressure borne by the support can be measured by a reinforcing bar meter and an axial force meter.
3. The dynamic inverse analysis-based calculation and fusion algorithm of claim 1, wherein the soil pressure at any depth behind the wall is calculated by the following steps:
1) in the excavation process of the foundation pit supported by the underground continuous wall and the inner support, the underground continuous wall is generally only under the action of self gravity in the vertical direction, the underground continuous wall is considered according to a pure curved member in the inversion process, and according to an elastic foundation beam model, the deformation and deflection line equation of the underground continuous wall meets the following formula (1):
wherein p (x) is the load distributed on the soil-back side of the underground continuous wall; and q (x) is the load distributed on the soil facing side of the underground diaphragm wall.
2) The supporting beam is considered according to the elastic homogeneous material, and is assumed to be obtained by the flat section of the pure bending member beam in the mechanics of materials, and the deformation y (x) of each section on the beam and the load distribution concentration satisfy the formula (2):
wherein EI is the cross-sectional bending stiffness of the beam; y (x) is an equation of the underground continuous wall inclination measuring curve; and x is the vertical coordinate of the underground continuous wall.
3) The horizontal soil pressure q (x) corresponding to the elastic bending deformation of the underground continuous wall structure can be calculated through the deep horizontal displacement of the underground continuous wall, and the soil pressure on the soil facing side of the underground continuous wall is estimated according to the formula (3)
4) And fitting a deep horizontal displacement curve into a one-dimensional multiple equation through mapping software, substituting the equation into the equations (1), (2) and (3), obtaining the soil pressure of the soil facing side of the underground continuous wall, and then obtaining the combined supporting soil pressure at a certain depth by the sum of the soil pressure born by the underground continuous wall and the support.
4. The dynamic inverse analysis-based calculation and fusion algorithm of claim 1, wherein the omnidirectional real-time displacement pipe is a tandem rod-shaped sensor developed for deformation monitoring of supporting structures in engineering, and the sensor directly transmits the calculated transverse displacement data of the monitoring pipe to an intelligent monitoring platform by using a mobile internet of things.
5. The dynamic inverse analysis based calculation and fusion algorithm as claimed in claim 1, wherein the omnidirectional real-time displacement tubes can be freely spliced according to the height of a structure, the use is convenient and flexible, data can be collected every five minutes, and continuous monitoring of the data can be realized.
6. The calculation and fusion algorithm based on the dynamic inverse analysis as claimed in claim 2, wherein the axial force meter can be used for monitoring the stress condition of the steel support in real time so as to adjust the magnitude of the axial force of the support at any time and control the deformation of the building envelope.
7. The calculation and fusion algorithm based on inverse dynamic analysis as claimed in claim 2, wherein the reinforcing bar meter measures the stress of the reinforcing bars inside the concrete support and can measure the temperature of the reinforcing bars synchronously.
8. The shield working well foundation pit intelligent monitoring system based on software and hardware fusion, which is characterized by comprising an underground continuous wall deformation acquisition device, an underground continuous wall stress acquisition device, a wall top displacement acquisition device, a supporting axial force acquisition device, a stand column displacement acquisition device, a soil body deformation acquisition device behind the underground continuous wall, a building deformation acquisition device, an underground pipeline displacement acquisition device, a pore water pressure acquisition device, a pit bottom intelligent monitoring system uplift acquisition device and a well mouth convergence acquisition device.
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