CN113720382B - Calculation and fusion algorithm based on dynamic inverse analysis and intelligent monitoring system - Google Patents
Calculation and fusion algorithm based on dynamic inverse analysis and intelligent monitoring system Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 76
- 230000004927 fusion Effects 0.000 title claims abstract description 37
- 238000004458 analytical method Methods 0.000 title claims abstract description 34
- 238000004364 calculation method Methods 0.000 title claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 73
- 239000002689 soil Substances 0.000 claims abstract description 38
- 230000001133 acceleration Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 18
- 238000005452 bending Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
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- 238000013461 design Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
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- 230000003111 delayed effect Effects 0.000 description 1
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- 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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention provides a dynamic inverse analysis calculation and fusion algorithm-based intelligent monitoring system, which comprises the following steps of using an omnidirectional real-time displacement tube to monitor deep horizontal displacement of an underground continuous wall in real time, collecting wall acceleration and corner data at each measuring point in the underground continuous wall, and obtaining horizontal displacement of each point of the wall relative to the top end by using STRDAL algorithm; the monitoring platform collects various data measured by the omnidirectional real-time displacement tube; obtaining and deriving a horizontal displacement curve; fitting the 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 dynamic soil pressure inversion analysis. The invention not only can realize real-time continuous monitoring, flexible and convenient use and high measurement precision, but also has better economy, higher safety and more accurate predictability, wherein the dynamic inverse analysis calculation and fusion algorithm has 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 section tunnels have been vigorously developed. In order to meet the construction requirements of the buildings and structures, the excavation depth of the foundation pit is increased at first, and the excavation scale of the foundation pit is enlarged, so that the ultra-deep foundation pit is continuously developed, the problem of the deep foundation pit is continuously increased, and the deep foundation pit gradually becomes one of main research contents of geotechnical engineering in modern city construction. Nowadays, shield working wells are frequently used for ultra-deep foundation pits, and have very strict requirements on real-time performance and accuracy of foundation pit monitoring. The traditional foundation pit monitoring technology relies on manual measurement, and has the problems of low monitoring precision, untimely monitoring time, low monitoring efficiency and the like, and cannot meet the requirement of continuous monitoring.
In addition, the method is particularly important to monitoring deep horizontal displacement, internal support, soil pressure and the like in the ultra-deep foundation pit of the shield working well. The traditional measurement adopts manual data collection, the data collection and transmission efficiency is low, the data collection time interval is longer, and the accumulated error is continuously increased. Once the accumulated error exceeds the threshold, the construction of the working well structure is affected, and the construction period of the subsequent engineering is interfered. Therefore, the dynamic information of the foundation pit cannot be mastered in real time, corresponding measures cannot be taken for processing at the first time when the foundation pit is abnormal, the opportunity for processing the problem is delayed, and construction safety accidents are easy to occur.
Disclosure of Invention
The invention aims to provide a dynamic inverse analysis calculation and fusion algorithm-based intelligent monitoring system which has overwhelming advantages in real-time performance, predictability, accuracy, safety and economy.
The invention aims to achieve the aim, and the aim is achieved by the following technical scheme:
The invention provides an intelligent monitoring system for a shield working well foundation pit based on software and hardware fusion, wherein real-time monitoring data of thirteen monitoring projects can be transmitted to an intelligent monitoring platform.
The thirteen monitoring items capable of transmitting real-time data to the intelligent monitoring platform comprise:
Deforming the underground diaphragm wall; internal force of underground diaphragm wall; horizontal displacement and vertical displacement of the wall top of the underground continuous wall; subsidence of the earth's surface; a groundwater level; supporting the axial force; the vertical column structure is horizontally displaced and vertically displaced; soil pressure; building inclination and settlement; horizontal displacement and vertical displacement of the underground pipeline; pore water pressure; the pit bottom bulges; the wellhead converges.
The foundation pit supporting structure comprises a concrete support, a steel support, an upright post, an underground continuous wall, a waist beam, a steel enclosing purlin and a crown beam.
The intelligent monitoring system comprises a data acquisition system and an intelligent monitoring platform, wherein the data acquisition system is an omnidirectional real-time displacement tube, axial force meter and reinforcement 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 acquisition device, the underground diaphragm wall stress acquisition device, the wall top displacement acquisition device, the support shaft force acquisition device, the upright post displacement acquisition device, the underground diaphragm wall rear soil deformation acquisition device, the building deformation acquisition device, the underground pipeline displacement acquisition device, the pore water pressure acquisition device, the pit bottom bulge acquisition device and the wellhead convergence acquisition 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 by the data acquisition system.
Intelligent monitoring system of shield work well foundation ditch based on software and hardware fuses specifically includes:
1) An omnidirectional real-time displacement tube, axial force meter and reinforcement meter combined data acquisition system based on dynamic inverse analysis calculation and fusion algorithm.
2) A wired transmission device.
3) An automatic safety information monitoring platform.
The omnidirectional real-time displacement tube based on the dynamic inverse analysis calculation and fusion algorithm can monitor deep horizontal displacement of the underground continuous wall in real time, all measuring points in the tube collect data such as acceleration, rotation angle and the like of the wall, and the horizontal displacement of each point of the wall relative to the top is obtained by using a STRDAL patent algorithm (based on a 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 freely 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 used for monitoring and developing the deformation of a foundation pit supporting structure in engineering, and the sensor can directly transmit the 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 axial force of the support 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 measures the stress of reinforcing steel bars in the concrete support and can synchronously measure the temperature of the reinforcing steel bars.
The dynamic inverse analysis calculation and fusion algorithm comprises the following specific steps:
1) The omnidirectional real-time displacement tube can monitor the deep horizontal displacement of the underground continuous wall in real time, each measuring point in the tube can collect data such as acceleration, rotation angle 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 STRDAL patent algorithm.
2) The basic method for inverting the soil pressure comprises the following steps: the total soil pressure is equal to the sum of the underground diaphragm wall bearing soil pressure and the supporting bearing soil pressure, wherein the underground diaphragm wall bearing soil pressure can be obtained through inversion of an underground diaphragm wall deep horizontal displacement curve generated by an intelligent monitoring platform, and the supporting bearing soil pressure can be obtained through monitoring by a reinforcing bar meter, a shaft force meter and other devices.
3) In the foundation pit excavation process of underground diaphragm wall and internal support, the vertical direction is generally only under the action of gravity, the underground diaphragm wall is considered according to pure bending components in the inversion process, and the deformation bending line equation of the underground diaphragm wall is required to satisfy the formula (1) by referring to an elastic foundation beam model:
（1）
wherein p (x) is the load distributed on the earth side of the underground continuous wall; q (x) is the load distribution of the earth facing side of the underground diaphragm wall.
4) The support beam is obtained by assuming that the flat section of the pure bent component beam of the material mechanics is available according to the consideration of elastic homogeneous materials, and the deformation y (x) and the load distribution concentration of each section on the beam satisfy the formula (2):
（2）
where EI is the cross-sectional flexural 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 diaphragm wall structure can be calculated through the inclinometry displacement of the underground diaphragm wall, thereby estimating the soil pressure on the earth facing side of the underground diaphragm wall, as shown in (3)
（3）
6) The deep horizontal displacement curve is fitted into a unitary multiple equation through drawing software, and is substituted into formulas (1), (2) and (3), so that the earth pressure on the earth facing side of the underground continuous wall can be obtained, and then the combined support earth pressure at a certain depth can be obtained by the sum of the earth pressure borne by the support.
A shield working well foundation pit intelligent monitoring system based on software and hardware fusion enables axial force and soil pressure predicted by the system to be continuously checked according to axial force and soil pressure which are monitored subsequently under a certain working condition, so that further prediction is more accurate.
The invention has the advantages that: the intelligent monitoring system for the foundation pit of the shield working well, which is integrated by software and hardware, can automatically collect data, can grasp dynamic information of the foundation pit in real time, and on the other hand, the collected deep horizontal displacement monitoring data is fed back to an intelligent monitoring platform to form a real-time displacement change curve, and the back earth pressure of underground continuous walls at different depths can be obtained through a dynamic inverse analysis calculation and fusion algorithm, so that the system is beneficial to providing reference for underground engineering design measurement and scientific research in the geotechnical engineering field. 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 are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
FIG. 1 is an example of a three-dimensional offset graph generated by an engineering intelligent monitoring platform according to the present invention.
FIG. 2 is a plan view of a monitoring point of a shield work well in an engineering 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 following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention will be described in detail below with reference to the accompanying drawings and examples of shield work wells in a certain project. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the practical scope of the present invention.
The invention provides an intelligent monitoring system for a shield working well foundation pit 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 embody data change in the form of a three-dimensional offset curve or the like or generate a displacement cloud picture and the like so as to more intuitively embody the construction response of a supporting structure. An example of a three-dimensional offset graph generated by an intelligent monitoring platform is shown in figure 1,
FIG. 2 shows a shield work well monitoring point plan in an engineering, including thirteen monitoring projects.
The thirteen monitoring items capable of transmitting real-time data to the intelligent monitoring platform comprise:
Deforming the underground diaphragm wall; internal force of underground diaphragm wall; horizontal displacement and vertical displacement of the wall top of the underground continuous wall; subsidence of the earth's surface; a groundwater level; supporting the axial force; the vertical column structure is horizontally displaced and vertically displaced; soil pressure; building inclination and settlement; horizontal displacement and vertical displacement of the underground pipeline; pore water pressure; the pit bottom bulges; the wellhead converges.
The intelligent monitoring system comprises a data acquisition system and an intelligent monitoring platform, wherein the data acquisition system is an omnidirectional real-time displacement tube, axial force meter and reinforcement 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 acquisition device, the underground diaphragm wall stress acquisition device, the wall top displacement acquisition device, the support shaft force acquisition device, the upright post displacement acquisition device, the underground diaphragm wall rear soil deformation acquisition device, the building deformation acquisition device, the underground pipeline displacement acquisition device, the pore water pressure acquisition device, the pit bottom bulge acquisition device and the wellhead convergence acquisition device.
Intelligent monitoring system of shield work well foundation ditch based on software and hardware fuses specifically includes:
1) An omnidirectional real-time displacement tube, axial force meter and reinforcement meter combined data acquisition system based on dynamic inverse analysis calculation and fusion algorithm.
2) A wired transmission device.
3) An automatic safety information monitoring platform.
The omnidirectional real-time displacement tube based on the dynamic inverse analysis calculation and fusion algorithm can be used for monitoring and developing the deformation of a foundation pit supporting structure in engineering, and the sensor can directly transmit the 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 spliced freely 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 monitor deep horizontal displacement of the underground continuous wall in real time, all measuring points in the tube collect data such as acceleration, rotation angle and the like of the wall, and the horizontal displacement of each point of the wall relative to the top is obtained by using a STRDAL patent algorithm (based on a software and hardware real-time interaction algorithm, 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 as to adjust the magnitude of the supporting 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 measures the stress of reinforcing steel bars in the concrete support and can synchronously measure the temperature of the reinforcing steel bars.
A calculation and fusion algorithm based on dynamic inverse analysis comprises the specific steps of 6 steps.
In the step 1, the omnidirectional displacement tube can monitor the deep horizontal displacement of the underground diaphragm wall in real time, all measuring points in the omnidirectional displacement tube can collect data such as acceleration, rotation angle and the like of a wall body, and the horizontal displacement of each point of the wall body relative to the top end is obtained by utilizing STRDAL patent algorithm.
Step 2, a basic method for soil pressure inversion: the total soil pressure is equal to the sum of the underground diaphragm wall bearing soil pressure and the supporting bearing soil pressure, wherein the underground diaphragm wall bearing soil pressure can be obtained through inversion of an underground diaphragm wall deep horizontal displacement curve generated by an intelligent monitoring platform, and the supporting bearing soil pressure can be obtained through monitoring by a reinforcing bar meter, a shaft force meter and other devices.
Step 3, in the process of excavating the foundation pit supported by the underground diaphragm wall and the inner support, the vertical direction is generally only under the action of gravity, the underground diaphragm wall is considered according to a pure bending member in the inversion process, and the deformation bending line equation of the underground diaphragm wall is required to satisfy the formula (1) by referring to an elastic foundation beam model:
（1）
wherein p (x) is the load distributed on the earth side of the underground continuous wall; q (x) is the load distribution of the earth facing side of the underground diaphragm wall.
Step 4, considering the supporting beam according to elastic homogeneous materials, assuming that the flat section of the pure bending component beam of the material mechanics is available, and the deformation y (x) and the load distribution concentration of each section on the beam satisfy the formula (2):
（2）
where EI is the cross-sectional flexural 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 diaphragm wall structure through the deep horizontal displacement of the underground diaphragm wall, thereby estimating the soil pressure of the earth facing side of the underground diaphragm wall, as shown in (3)
（3）
And 6, fitting the deep horizontal displacement curve into a unitary multiple equation through drawing software, substituting the unitary multiple equation into formulas (1), (2) and (3) to obtain the earth pressure on the earth facing side of the underground diaphragm wall, and obtaining the combined supporting earth pressure at a certain depth by the sum of the earth pressure borne by the support.
A shield working well foundation pit intelligent monitoring system based on software and hardware fusion enables axial force and soil pressure predicted by the system to be continuously checked according to axial force and soil pressure which are monitored subsequently under a certain working condition, so that further prediction is more accurate.
The invention discloses an intelligent monitoring system for a shield working well foundation pit based on software and hardware fusion, which comprises a data acquisition system and an intelligent monitoring platform. The intelligent monitoring system for the foundation pit of the shield working well with the integrated software and hardware can automatically collect data, the collection time interval is only 5 minutes, the dynamic information of the 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 are fed back to the intelligent monitoring platform to form a real-time displacement change curve, and the back earth pressure of the underground continuous wall at different depths can be obtained through a dynamic inverse analysis calculation and fusion algorithm, so that the method is beneficial to providing reference for underground engineering design and measurement and is beneficial to scientific research in the geotechnical engineering field. Compared with the traditional foundation pit monitoring method, the system has overwhelming advantages in real-time performance, predictability, accuracy, safety and economy.
Claims (6)
1. The dynamic inverse analysis calculation and fusion algorithm is characterized by comprising the following specific steps:
1) The method comprises the steps of monitoring deep horizontal displacement of an underground continuous wall in real time by using an omnidirectional real-time displacement tube, collecting wall acceleration, rotation angle and displacement data at each measuring point in the underground continuous wall, providing relative coordinates of points of the underground continuous wall, and obtaining horizontal displacement of each point of the wall relative to the top by using a real-time interaction algorithm based on software and hardware;
2) The monitoring platform collects various data measured by the omnidirectional real-time displacement tube;
3) Obtaining and deriving a horizontal displacement curve;
4) Fitting the deep horizontal displacement curve into a unitary multiple equation through mapping software;
5) Obtaining the soil pressure at any depth behind the wall by utilizing dynamic soil pressure inversion analysis;
the basic method for inverting the soil pressure is that the total soil pressure is equal to the sum of the soil pressure born by the underground diaphragm wall and the soil pressure born by the support, wherein the soil pressure born by the underground diaphragm wall is obtained by inverting the deep horizontal displacement curve of the engineering of the underground diaphragm wall, and the soil pressure born by the support is measured by a reinforcing steel bar meter and an axial force meter;
The soil pressure at any depth behind the wall is calculated as follows:
5-1) in the process of excavating a foundation pit supported by a underground diaphragm wall and an inner support, the underground diaphragm wall is generally only under the action of gravity in the vertical direction, and in the inversion process, the underground diaphragm wall is considered according to a pure bending member, and according to an elastic foundation beam model, the deformation flexible line equation of the underground diaphragm wall is required to satisfy the formula (1):
（1）
in the method, in the process of the invention, Representing the section bending stiffness of the beam,/>Equation representing underground diaphragm wall inclinometry curve,/>Is the vertical coordinate of the underground continuous wall,/>Distributing load for the earth-backed side of the underground continuous wall; /(I)A horizontal earth pressure representing elastic bending deformation of the underground diaphragm wall structure;
5-2) the support beam is assumed from the flat cross section of the pure bent structural beam of the material mechanics, considering the elastic homogeneous material, and the deformation and load distribution concentration of each cross section on the wall satisfy the formula (2):
（2）
in the method, in the process of the invention, Representing the section flexural rigidity of a wall,/>Equation representing underground diaphragm wall inclinometry curve,/>Is the vertical coordinate of the underground continuous wall,/>A horizontal earth pressure representing elastic bending deformation of the underground diaphragm wall structure;
5-3) calculating a horizontal soil pressure corresponding to the elastic bending deformation of the underground diaphragm wall structure by the deep horizontal displacement of the underground diaphragm wall Thereby estimating the earth pressure of the earth facing side of the diaphragm wall, see (3)
（3）
5-4) Fitting the deep horizontal displacement curve into a unitary multiple equation through a mapping software, substituting the unitary multiple equation into the equations (1), (2) and (3) to obtain the earth pressure on the earth facing side of the underground diaphragm wall, and obtaining the combined supporting earth pressure at a certain depth by the sum of the earth pressure borne by the support.
2. The dynamic inverse analysis calculation and fusion algorithm according to claim 1, wherein the omnidirectional real-time displacement tube is a tandem-type rod-shaped sensor developed for monitoring deformation of a supporting structure in engineering, and the sensor directly transmits calculated lateral displacement data of the monitoring tube to an intelligent monitoring platform by utilizing a mobile internet of things.
3. The calculation and fusion algorithm based on dynamic inverse analysis according to claim 1, wherein the omnidirectional real-time displacement tube is freely spliced according to the height of a structure, is convenient and flexible to use, and is used for collecting data every five minutes, so that continuous monitoring of the data is realized.
4. The dynamic inverse analysis calculation and fusion algorithm according to claim 2, wherein the axial force meter is used for monitoring the stress condition of the steel support in real time so as to adjust the axial force of the support at any time and control the deformation of the enclosure structure.
5. The dynamic inverse analysis based calculation and fusion algorithm according to claim 2, wherein the rebar meter measures the rebar stress inside the concrete support and synchronously measures its temperature.
6. A dynamic inverse analysis-based calculation and fusion system using the algorithm according to any one of claims 1 to 5, 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 support shaft force acquisition device, a column displacement acquisition device, an underground continuous wall rear soil deformation acquisition device, 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 wellhead convergence acquisition device.
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