CN116005736A - Foundation pit stability monitoring and steel support axial force control device and method - Google Patents
Foundation pit stability monitoring and steel support axial force control device and method Download PDFInfo
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Abstract
The invention discloses a device and a method for monitoring stability of a foundation pit and controlling axial force of a steel support, comprising the following steps: the main body box is used as a supporting body to support the solar energy power storage module, the foundation pit stability monitoring module and the steel support axial force control module; the solar energy storage module is used for supplying power to the foundation pit stability monitoring module and the steel support axial force control module; the foundation pit stability monitoring module is used for acquiring foundation pit stability monitoring data; the steel support axial force control module is used for acquiring foundation pit stability monitoring prediction data; the steel support is used for supporting the diaphragm wall. According to the method, the foundation pit stability monitoring prediction data are obtained by acquiring the foundation pit stability monitoring data in real time, and the axial force applied to the steel support is adjusted to support the diaphragm wall. The method has the characteristics of simplicity in operation, multifunction, intellectualization and the like, solves the problem that the actual damage condition of the structure is not mastered timely, and ensures more reliable support of the foundation pit.
Description
Technical Field
The invention relates to the technical field of foundation pit engineering monitoring and steel support axial force control, in particular to a device and a method for monitoring stability of a foundation pit and controlling the steel support axial force.
Background
With rapid development of various modern technologies, the foundation pit monitoring makes various industries widely start to use informationized technologies, so that the production efficiency can be improved, and the quality level can be ensured. Especially in foundation ditch engineering trade not only can be real-time monitor the scene, can all be quick to the understanding of various data information, can fully grasp whether the foundation ditch is stable at present and whether supporting structure safe and reliable, timely before the problem takes place with the potential safety hazard.
The foundation pit is generally a supporting structure with continuous walls (piles) and steel supports, and in order to avoid instability of the whole supporting system caused by supporting damage due to exceeding of the design strength of supporting shaft force, the monitoring of the supporting shaft force is particularly important. Due to the change of time, the interior of the foundation pit can change, so that the supporting shaft force of the steel supporting and supporting structure is changed. In order to ensure that the foundation pit diaphragm wall is stable in construction, real-time deformation stability monitoring is required, and feedback control is performed on the safety of the foundation pit by combining auxiliary side wall steel support axial force control, so that a device capable of adjusting the support axial force of the steel support according to the deformation of the foundation pit diaphragm wall in real time is needed, and damage caused by untimely mastering of the actual damage condition of the structure is avoided.
Disclosure of Invention
The invention provides a device and a method for monitoring stability of a foundation pit and controlling axial force of a steel support, which are used for overcoming the technical problems.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the foundation pit stability monitoring and steel support axial force control device comprises a main body box, a solar energy power storage module, a foundation pit stability monitoring module, a steel support axial force control module and a steel support;
the main body box is used as a supporting body to support the solar energy power storage module, the foundation pit stability monitoring module and the steel support axial force control module;
the solar energy storage module is used for supplying power to the foundation pit stability monitoring module and the steel support axial force control module;
the foundation pit stability monitoring module is used for acquiring foundation pit stability monitoring data; the foundation pit stability monitoring data comprise inclination angle data of the underground continuous wall, axial strain data of the steel support and sedimentation data at measuring points of the underground continuous wall;
the steel support axial force control module is used for acquiring foundation pit stability monitoring prediction data through the foundation pit stability monitoring data so as to adjust the axial force applied to the steel support (13) according to the foundation pit stability monitoring prediction data;
the steel support is used for supporting the underground diaphragm wall.
Further, the main body box comprises an upper cover plate, a reinforced steel plate, a middle plate, a supporting plate, a bottom plate and a steel supporting connecting part;
the reinforced steel plate is fixedly arranged on the side wall of the foundation pit; the upper cover plate is vertically fixed on one side, far away from the side wall of the foundation pit, of the top of the reinforced steel plate; the bottom plate is vertically fixed on one side, far away from the side wall of the foundation pit, of the bottom of the reinforced steel plate, and the bottom plate is parallel to the upper cover plate; the middle plate is arranged between the upper cover plate and the bottom plate in parallel, and is vertically fixed on the reinforced steel plate;
the steel support connecting part is respectively connected with the upper cover plate and the bottom plate in a sliding way; the steel support is fixedly arranged on one side, far away from the reinforced steel plate, of the steel support connecting part; the other side of the steel support is abutted with the ground connecting wall.
Further, the steel support connection part comprises two first sliding wing plates, a second sliding wing plate and a casing wall;
one end of the first sliding wing plate is fixedly arranged on the outer side wall of the protective cylinder wall, and the other end of the first sliding wing plate is in sliding connection with the upper cover plate along the direction perpendicular to the reinforced steel plate; one end of the second sliding wing plate is fixedly arranged on the outer side wall of the protective cylinder wall, and the other end of the second sliding wing plate is in sliding connection with the bottom plate along the direction perpendicular to the reinforced steel plate; one side of the pile casing wall, which is far away from the reinforced steel plate, is fixedly connected with the steel support, and the steel support and the pile casing wall are coaxially arranged; the end part of the pile casing wall, which is far away from one side of the steel support, is fixedly provided with a support plate, and the support plate is perpendicular to the axis of the pile casing wall.
Further, an upper cover plate sliding groove is formed in one side of the upper cover plate, which faces the bottom plate; the central line of the upper cover plate chute is perpendicular to the reinforced steel plate; the bottom plate is provided with a bottom plate chute corresponding to the upper cover plate chute;
the steel support connecting part is connected with the upper cover plate in a sliding way through the upper cover plate sliding groove; and the steel support connecting part is in sliding connection with the bottom plate through the bottom plate sliding groove.
Further, the solar battery module comprises the solar device and the battery device,
the solar device is arranged at the top of the upper cover plate to acquire solar energy and convert the solar energy into electric energy;
the storage battery device is connected with the solar device and is used for storing electric energy acquired by the solar device;
the storage battery device is electrically connected with the foundation pit stability monitoring module and the steel support axial force control module so as to supply power to the foundation pit stability monitoring module and the steel support axial force control module.
Further, an upper cover plate groove for accommodating the solar device is formed in the top of the upper cover plate.
Further, the foundation pit stability monitoring module comprises a data monitoring host, an inclinometer device, a strain gauge device and a static level device;
the inclinometer device is fixedly arranged on the reinforcing plate and used for acquiring inclination angle data of the underground continuous wall;
the strain gauge device is fixedly arranged on the inner side of the casing wall and used for acquiring axial strain data of the steel support;
the static level device is fixedly arranged on the middle plate and used for acquiring settlement data at a ground continuous wall measuring point;
the data monitoring host is respectively and electrically connected with the inclinometer device, the strain gauge device and the static level device to acquire inclination angle data of the underground continuous wall, axial strain data of the steel support and sedimentation data at measuring points of the underground continuous wall; the data monitoring host is fixedly arranged in the main body box.
Further, the steel support axial force control module comprises an axial force support device and a steel support control system;
the axial force supporting device comprises a hydraulic cylinder control valve module and a hydraulic cylinder; the bottom of the hydraulic cylinder is fixedly arranged on the reinforced steel plate, the top of the hydraulic cylinder is propped against the steel support connecting part, and the hydraulic cylinder control valve module is used for controlling hydraulic oil to enter and exit the hydraulic cylinder;
the steel support control system comprises a control unit and a hydraulic pump station;
the control unit is electrically connected with the data monitoring host to control the axial force supporting device according to the stability monitoring prediction data of the foundation pit so as to adjust the axial force applied to the steel support;
the control unit controls the axial force supporting device through the hydraulic pump station.
The control method of the foundation pit stability monitoring and steel support axial force control device comprises the following steps of:
s1: acquiring foundation pit stability monitoring data, wherein the foundation pit stability monitoring data comprise inclination angle data of a diaphragm wall, axial strain data of a steel support and sedimentation data at measuring points of the diaphragm wall;
s2: acquiring a historical monitoring time sequence of the previous m times of monitoring according to the foundation pit stability monitoring data so as to acquire a training set of the historical monitoring time sequence; the historical monitoring time series of the previous m times of monitoring comprises a time series training set of the previous m times of monitoring of the inclination angle data of the diaphragm wall, a time series training set of the previous m times of monitoring of the axial strain data of the steel support, and a time series training set of the previous m times of monitoring of the sedimentation data at the measuring point of the diaphragm wall;
s3: acquiring a monitoring predicted value of the (m+1) th time according to the training set of the historical monitoring time sequence; the m+1th monitoring predicted value comprises an m+1th monitoring predicted value of inclination angle data of the diaphragm wall, an m+1th monitoring predicted value of axial strain data of the steel support, and an m+1th monitoring predicted value of settlement data at a diaphragm wall measuring point;
s4: and controlling the axial force applied to the axial force supporting device according to the m+1th monitoring predicted value so as to control the axial force applied to the steel support.
Further, the m+1th monitoring prediction value is obtained as follows:
y m+1,k ＝W 0 Y k +W m X m +W m-1 X m-1 +W m-2 X m-2 +…+W m-p+1 X m-p+1 +∈
wherein: y is m+1,k A predictive value representing the m+1th phase of the kth monitored term; w (W) o P (1)<p.ltoreq.m) the coefficient of the target value of phase; y is k A monitor value representing the kth monitor item in the previous p-phase; w (W) m-p+1 Coefficients representing the feature vector of the previous p-phase, X m-p+1 A feature vector representing the previous p-phase; e is a coefficient subject to gaussian distribution.
The beneficial effects are that: according to the foundation pit stability monitoring and steel support axial force control device and method, foundation pit stability monitoring data are obtained in real time through the foundation pit stability monitoring module, so that foundation pit stability monitoring prediction data are obtained, and axial force applied to a steel support is controlled; and supporting the ground connecting wall. The method has the advantages of realizing real-time monitoring of the safety state of the foundation pit, carrying out safety control of the foundation pit, having the characteristics of simplicity in operation, multifunction, intellectualization and the like, solving the problem of untimely mastering of the actual damage condition of the structure and ensuring more reliable support of the foundation pit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a foundation pit stability monitoring and steel support axial force control device according to the present invention;
FIG. 2 is a front elevational view of the main body case of the present invention;
FIG. 3 is a side view of the main body case of the present invention;
FIG. 4 is a schematic diagram of the connection of the hydraulic control valve module in the main body box of the present invention;
FIG. 5 is a schematic diagram of a hydraulic cylinder in an embodiment of the invention;
FIG. 6 is a schematic diagram of a data monitoring host according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a method for monitoring stability of a foundation pit and controlling axial force of a steel support according to an embodiment of the present invention;
FIG. 8 is a flow chart of a method for monitoring stability of a foundation pit and controlling axial force of a steel support according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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 embodiment provides a foundation pit stability monitoring and steel support axial force control device, which is shown in figures 1-6 and comprises a main body box 1, a solar power storage module, a foundation pit stability monitoring module, a steel support axial force control module and a steel support 13;
the main body box 1 is used as a supporting body to support the solar energy power storage module, the foundation pit stability monitoring module and the steel support axial force control module;
the solar energy storage module is used for supplying power to the foundation pit stability monitoring module and the steel support axial force control module;
the foundation pit stability monitoring module is used for acquiring foundation pit stability monitoring data;
the steel support axial force control module is used for acquiring foundation pit stability monitoring prediction data through the foundation pit stability monitoring data so as to adjust the axial force applied to the steel support 13 according to the foundation pit stability monitoring prediction data;
the steel support 13 is used for supporting the diaphragm wall through axial force applied to the steel support 13. The steel support in this embodiment adopts a structure that can function as a support in a cylindrical shape commonly used in the art, and therefore the structure of the steel support will not be described in detail here.
Preferably, the main body case 1 includes an upper cover plate 101, a reinforced steel plate 102, a middle plate 105, a support plate 107, an upper cover plate groove 108, a bottom plate 110, a steel support connection,
the reinforced steel plate 102 is fixedly arranged on the side wall of the foundation pit and embedded in the side wall of the foundation pit; the upper cover plate 101 is vertically fixed on one side, far away from the side wall of the foundation pit, of the top of the reinforced steel plate 102; the bottom plate 110 is vertically fixed on one side, far away from the side wall of the foundation pit, of the bottom of the reinforced steel plate 102, and the bottom plate 110 is parallel to the upper cover plate 101; the middle plate 105 is arranged in parallel between the upper cover plate 101 and the bottom plate 110, and the middle plate 105 is vertically fixed to the reinforced steel plate 102;
the steel support connecting parts are respectively connected with the upper cover plate 101 and the bottom plate 110 in a sliding manner; the steel support 13 is fixedly arranged on one side of the steel support connecting part far away from the reinforced steel plate 102;
preferably, the steel support connection comprises two first sliding wings 103a, a second sliding wing 103b and a casing wall 104;
one end of the first sliding wing plate 103a is fixedly arranged on the outer side wall of the casing wall 104, and the other end is in sliding connection with the upper cover plate 101 along the direction perpendicular to the reinforced steel plate 102; one end of the second sliding wing plate 103b is fixedly arranged on the outer side wall of the casing wall 104, and the other end is slidably connected with the bottom plate 110 along the direction perpendicular to the reinforced steel plate 102; two sliding wings 103 are integral with the cartridge wall 104; the side of the pile casing wall 104 away from the reinforced steel plate 102 is fixedly connected with the steel support 13, and the steel support 13 and the pile casing wall 104 are coaxially arranged; the end part of the pile casing wall 104, which is far away from the side where the steel support 13 is fixed, is fixedly provided with a support plate 107, and the support plate 107 is perpendicular to the axis of the pile casing wall 104;
preferably, an upper cover chute 109 is arranged on the side of the upper cover 101 facing the bottom plate 110; the central line of the upper cover plate chute 109 is perpendicular to the reinforced steel plate 102; the bottom plate 110 is provided with a bottom plate chute 106 corresponding to the upper cover plate chute 109;
the steel support connecting part is in sliding connection with the upper cover plate 101 through the upper cover plate sliding groove 109; and the steel support connection portion is slidably connected to the bottom plate 110 through the bottom plate chute 106.
Specifically, the first sliding wing plate 103a on the steel support connection part is slidably connected with the upper cover plate 101 through the upper cover plate chute 109; the second sliding wing plate 103b on the steel support connection part is slidably connected with the bottom plate 110 through the bottom plate sliding groove 106.
Preferably, the solar cell module comprises the solar device 2 and the battery device 3,
the solar device 2 is arranged on the top of the upper cover plate 101 to obtain solar energy and convert the solar energy into electric energy;
the storage battery device 3 is connected with the solar device 2 and is used for storing electric energy acquired by the solar device 2;
the storage battery device 3 is electrically connected with the foundation pit stability monitoring module and the steel support axial force control module so as to supply power to the foundation pit stability monitoring module and the steel support axial force control module.
Preferably, the top of the upper cover plate 101 is provided with an upper cover plate groove 108 for accommodating the solar device 2; the solar device 2 is arranged inside the upper cover plate groove 108;
preferably, the foundation pit stability monitoring module comprises a data monitoring host 4, an inclinometer device 6, a strain gauge device 8 and a static level device 9;
the inclinometer device 6 is fixedly arranged on the reinforcing plate 102 and is used for acquiring inclination angle data of the underground continuous wall;
the strain gauge device 8 is fixedly arranged on the inner side of the protective cylinder wall 104 and is used for acquiring axial strain data of the steel support; specifically, after the protective cylinder wall is fixed with the steel support, the deformation of the protective cylinder wall is cooperated with the deformation of the steel support, so that the deformation of the protective cylinder wall is monitored, and the axial strain of the steel support can be indirectly measured;
the static level device 9 is fixedly arranged on the middle plate 105 and is used for acquiring settlement data at a ground continuous wall measuring point;
the data monitoring host 4 is respectively and electrically connected with the inclinometer device 6, the strain gauge device 8 and the static level device 9 so as to acquire inclination angle data of the underground continuous wall, axial strain data of the steel support and settlement data at measuring points of the underground continuous wall; the data monitoring host 4 is fixedly arranged in the main body box 1.
Specifically, the inclinometer device 6, the strain gauge device 8 and the static level device 9 are connected with the data monitoring host 4 through a sensor signal transmission line 12;
preferably, the data monitoring host 4 includes a data acquisition device 401, a voltage transformation device 402, a communication unit 403 and a power supply device (not labeled in the figure); the transformer is used for supplying power to the data acquisition device and the communication unit, and because the voltage of the data acquisition device and the communication unit is 15V, the transformer is externally connected with 220V power supply, and the transformer is needed to be used for transforming the voltage to supply power to the data acquisition device and the communication unit;
specifically, in this embodiment, the sensor signal line adopts a grating optical fiber, the inclinometer adopts a grating optical fiber inclinometer, the strain gauge adopts a grating optical fiber steel strain gauge, and the static level adopts a grating optical fiber static level. The grating optical fiber sensor has low cost, high speed, light weight and small volume, and different sensors can be connected in series on a single optical fiber to measure temperature, strain, displacement, inclination, pressure, chemical and biological parameters and the like. The requirements of a series of different monitoring and controlling of the foundation pit at specific positions can be well met.
Preferably, the voltage transformation device 402 is connected to the battery device 3 through a voltage transformation line.
Preferably, the steel support axial force control module comprises an axial force support device and a steel support control system;
the axial force supporting device comprises a hydraulic cylinder control valve module and a hydraulic cylinder 10; the bottom of the hydraulic cylinder 10 is fixedly arranged on the reinforced steel plate 102, the top of the hydraulic cylinder is abutted against the steel support connecting part, and in particular, the top of the hydraulic cylinder is abutted against a supporting plate 107 arranged at one end of the cylinder protection wall 104 and used for supporting a steel support fixed on the cylinder protection wall; the hydraulic cylinder control valve module is used for changing the oil quantity of hydraulic oil entering and exiting the hydraulic cylinder 10;
specifically, the hydraulic cylinder 10 in the present embodiment includes a cylinder bottom plate 1001, a cylinder wall 1002, a cylinder partition 1003, and a cylinder plug 1004; the hydraulic cylinder bottom plate 1001 is fixedly connected with the bottom of the hydraulic cylinder wall 1002, and the hydraulic cylinder top 1004 is arranged at the top of the hydraulic cylinder wall 1002 and is in sliding connection with the hydraulic cylinder wall 1002; the hydraulic cylinder middle partition 1003 is arranged between the hydraulic cylinder bottom plate 1001 and the hydraulic cylinder top 1004, and is in sliding connection with the hydraulic cylinder wall 1002; the cylinder partition 1003, the cylinder bottom 1001 and the cylinder wall 1002 form a first cylinder liquid storage space 1005; the hydraulic cylinder middle partition 1003, the hydraulic cylinder plug 1004 and the hydraulic cylinder wall 1002 form a second hydraulic cylinder liquid storage space 1006; a first hydraulic cylinder liquid inlet and outlet 1008 is arranged on the hydraulic cylinder wall 1002 at one side of the first hydraulic cylinder liquid storage space 1005; a second hydraulic cylinder liquid inlet and outlet 1007 is arranged on the hydraulic cylinder wall 1002 at one side of the second hydraulic cylinder liquid storage space 1006; hydraulic oil is stored in the first hydraulic cylinder liquid storage space 1005 and the second hydraulic cylinder liquid storage space 1006;
the cylinder control valve module includes a first cylinder control valve 501 and a second cylinder control valve 502; the first cylinder control valve 501 is used to control the opening and closing of the first cylinder fluid inlet and outlet 1008, and the second cylinder control valve 502 is used to control the opening and closing of the second cylinder fluid inlet and outlet 1007.
Specifically, in this embodiment, through the change of hydraulic oil in the first hydraulic cylinder liquid storage space 1005 and the second hydraulic cylinder liquid storage space 1006, the movement of the hydraulic cylinder plug 1004 is realized, so as to adjust the steel support shaft force;
the steel support control system comprises a control unit 14 and a hydraulic pump station (not labeled in the figure).
The control unit 14 is electrically connected with the data monitoring host 4 to control the axial force supporting device according to the foundation pit stability monitoring prediction data so as to adjust the axial force applied to the steel support 13;
the control unit 14 controls the axial force supporting device through a hydraulic pump station;
specifically, a control unit 14 is disposed on the left side of the middle plate 105, and a horizontal monitoring device 11 is disposed above the control unit 14, and is used for checking whether the entire foundation pit stability monitoring device is in a horizontal state.
In this embodiment, the mechanical response of the diaphragm wall and the steel support stress are predicted according to a multivariate time prediction algorithm (lstm algorithm) of a control algorithm center carried in the control unit 14, and a steel support stress prediction value is obtained through collected inclination angle data of the diaphragm wall, steel support axial strain data and settlement data at a diaphragm wall measuring point, and steel support axial force is automatically controlled through comparison of the steel support stress prediction value and a target value, so as to reset the steel support stress. When the predicted value of the steel support stress is smaller than the lower limit value of the target force domain, the control unit controls the oil pump to start and compensate the steel support force. When the predicted value of the stress of the steel support is larger than the set upper limit value of the target force domain, the control unit controls the valve to open, and the steel support slowly leaks force.
The invention also discloses a control method of the foundation pit stability monitoring and steel support shaft force control device, as shown in figures 7-8, comprising the following steps:
s1: acquiring foundation pit stability monitoring data, wherein the foundation pit stability monitoring data comprise tilt angle data of a diaphragm wall, axial strain data of a steel support and sedimentation data at a diaphragm wall measuring point, and transmitting the tilt angle data of the diaphragm wall, the axial strain data of the steel support and the sedimentation data at the diaphragm wall measuring point to the control unit;
specifically, the control unit is configured to respectively arrange inclination angle data of the diaphragm wall, axial strain data of the steel support, and sedimentation data at a measuring point of the diaphragm wall into historical monitoring value time sequences, and construct a plurality of sets of time sequence training sets according to the historical monitoring value time sequences; performing ensemble learning according to the time sequence training set, and establishing a time sequence prediction model; and predicting the data of the inclination, convergence settlement and steel support strain of the diaphragm wall.
S2: acquiring a historical monitoring time sequence of the previous m times of monitoring according to the foundation pit stability monitoring data so as to acquire a training set of the historical monitoring time sequence; the historical monitoring time series of the previous m times of monitoring comprises a time series training set of the previous m times of monitoring of the inclination angle data of the diaphragm wall, a time series training set of the previous m times of monitoring of the axial strain data of the steel support, and a time series training set of the previous m times of monitoring of the sedimentation data at the measuring point of the diaphragm wall;
the time series of the first m monitoring is obtained as follows:
wherein: x is x i1 The monitoring value of the 1 st monitoring item of the ith monitoring is shown, namely the monitoring value of the inclination angle data of the ground continuous wall of the ith monitoring; x is x i2 Representing the monitoring value of the 2 nd monitoring item of the ith monitoring, namely the monitoring value of the settlement data of the ground continuous wall of the ith monitoring; x is x i3 Representing the monitored value of the 3 rd monitored item of the ith monitoring, namely the monitored value of the axial strain data of the steel support monitored by the ith monitoring; m represents the monitoring times of each monitoring item;
specifically, monitoring data including inclination angle data of the diaphragm wall, axial strain data of the steel support and sedimentation data at measuring points of the diaphragm wall are obtained through a foundation pit stability monitoring module; the foundation pit stability monitoring module can monitor inclination angle data of the underground continuous wall of the monitoring point, axial strain data of the steel support and sedimentation data at the measuring point of the underground continuous wall in the foundation pit construction excavation process; and data acquisition is carried out on the foundation pit stability monitoring module at intervals of set time, so that integration of monitoring multi-element information is realized. The foundation pit stability monitoring module adopts a wireless data transmission technology to transmit field monitoring information, namely foundation pit stability monitoring data, to the control unit 14, so that real-time multi-information simultaneous monitoring of one monitoring point in the construction process is realized. Wherein collection system includes: a inclinometer device 6, a strain gauge device 8 and a hydrostatic level device 9.
The data of the measuring points measured by the foundation pit stability monitoring module comprise inclination angle data of the diaphragm wall, axial strain data of the steel support and sedimentation data of the diaphragm wall measuring points, the multiple information are mutually influenced and have certain nonlinear connection, and a historical monitoring time sequence which is orderly arranged is formed aiming at the collected monitoring data of each monitoring item.
S3: acquiring a monitoring predicted value of the (m+1) th time according to the training set of the historical monitoring time sequence; the m+1th monitoring predicted value comprises an m+1th monitoring predicted value of inclination angle data of the diaphragm wall, an m+1th monitoring predicted value of axial strain data of the steel support, and an m+1th monitoring predicted value of settlement data at a diaphragm wall measuring point;
specifically, the m+1th monitoring prediction value is obtained as follows:
y m+1,k ＝W 0 Y k +W m X m +W m-1 X m-1 +W m-2 X m-2 +…+W m-p+1 X m-p+1 +∈
wherein: y is m+1,k A predictive value representing the m+1th phase of the kth monitored term; w (W) o P (1)<Coefficient w of target value of p.ltoreq.m) phase 0 ＝w m ,w m-1 ,…,w m-p+1 ；Y k Representing the monitored value of the kth monitored item in the previous p period, Y k ＝y m,k ,y m-1,k ,…,y m-p+1,k ；W m-p+1 Coefficients representing the feature vector of the previous p-phase, X m-p+1 A feature vector representing the previous p-phase; e is a coefficient which follows a Gaussian distribution, so that the target value of the m+1st phase can pass through the m-p+1st phase to the m-th phaseCharacteristic variables and target values of (2) are linearly represented; k represents the number of the monitoring item; the monitoring items in the embodiment comprise three items of inclination angle data of the diaphragm wall, axial strain data of the steel support and sedimentation data at measuring points of the diaphragm wall;
in one embodiment of the present invention, p=5 (five days of scrolling) indicates that the next-period monitoring data is predicted with the first 5-period monitoring data;
s4: the control unit controls the axial force supporting device according to the m+1th monitoring predicted value;
when y is m+1,k <σ d When the hydraulic pump station is used for pressurizing the steel supporting force, the steel supporting force is compensated;
when y is m+1,k ＞σ p When the hydraulic pump station is used, the steel supporting force is reduced, so that the steel supporting force is slowly released;
wherein: sigma (sigma) P Is the target force domain upper limit; sigma (sigma) d A target force domain lower limit value;
the target force domain lower limit value and the target force domain upper limit value are obtained as follows:
(0.6σ MAX <σ P <σ MAX )
(σ MIN <σ d ≤1.25σ MIN )
wherein: y is Y 1 The inclination angle data prediction value of the underground continuous wall is obtained; y is Y 2 Predicting values for axial strain data of the steel support; y is Y 3 The settlement data predicted value at the measuring point of the underground continuous wall is obtained; y is Y 1,MAX The upper limit value is specified for the inclination angle data of the underground continuous wall; y is Y 2,MAX The upper limit value is normalized for the steel support axial strain data; y is Y 3,MAX The upper limit value is normalized for sedimentation data at a measuring point of a diaphragm wall; sigma (sigma) MAX Is the stress limit value sigma of the steel support standard MIN Is the prestress value of the steel support.
Specifically, the inclination angle data of the underground continuous wall detection point at the latest continuous T-1 time point, the horizontal convergence displacement data of the underground continuous walls at two sides of the foundation pit, the axial strain data of the steel support and the settlement data at the underground continuous wall detection point are input into a time sequence model, and the prediction results of the underground continuous wall inclination, settlement and steel support strain at the next time point are obtained, so that the prediction of future multi-element monitoring information of the monitoring point is realized; with the acquisition of the later monitoring data, the rolling prediction of the later data is realized instead of the earlier data.
A specific simulation test of the present invention is as follows:
the underground railway station in the Changchun area adopts an open cut method, the foundation pit stability monitoring device is used for construction monitoring of the steel support at a certain position of the second road on site, and monitoring data of monitoring points are obtained through the foundation pit stability automatic monitoring device, and are shown in the following table. Through the device, monitoring of the inclination value, the convergence value, the settlement value and the deformation value of the steel support of the monitoring point is realized, monitoring of the multi-element information of one monitoring point is realized, and site construction is effectively guided. The monitoring junctions are shown in the table.
As shown in the table, according to the monitoring data obtained by the foundation pit stability monitoring device, predicting the later stage of the steel support axial force, and selecting 20 groups of monitoring data as a time sequence training set to obtain a steel support axial force prediction model. 5 sets of monitoring data were selected as a time series of test sets. The prediction results of the later stage of the steel support shaft force are shown in the table 2, and the data in the table 2 show that the maximum prediction error is 3.68%, the prediction error is relatively small, the engineering requirement precision can be met, and the invention has good prediction height for the monitoring data.
| Axial force monitor value/mm | Axial force prediction result/mm | Relative error/% |
| 855.78 | 887.23 | 3.68 |
| 877.65 | 892.01 | 1.64 |
| 882.78 | 854.32 | 3.22 |
| 893.63 | 882.34 | 1.26 |
| 912.42 | 921.45 | 0.99 |
The steel support is provided with an independent control system, the control algorithm is used as a core, the stress of the steel support is collected through the strain sensor device, the mechanical response of the underground continuous wall is collected through the inclination sensor device, the static level device and the laser range finder device, and the automatic control is performed according to the built-in multielement time prediction algorithm of the main control console and the set target force. When the stress of the steel support is smaller than the lower limit, the control algorithm center controls the oil pump to start to compensate the steel support force. When the stress of the steel support is larger than the set upper limit, the control algorithm controls the valve to open, and the steel support slowly leaks force at the speed of 10 KN/S.
The steel support control system comprises a shaft force supporting device and a control system, wherein the shaft force supporting device comprises a hydraulic cylinder, a hydraulic pump station and a control algorithm center. The control algorithm receives sensor signals, and signals of the strain sensor device, the inclination sensor device, the static level device and the laser range finder device are received, steel support stress is collected through the strain sensor device, and mechanical response of the underground continuous wall is collected through the inclination sensor device, the static level device and the laser range finder device. And resetting the target force through a control algorithm, performing automatic control, specifically setting the target force according to the mechanical response of the diaphragm wall, and performing automatic control on the steel support shaft force through the steel support stress.
The foundation pit stability monitoring and steel support axial force control device effectively reduces the participation of personnel, has more prominent advantages particularly in the environment of inconvenient personnel observation caused by the construction space constraint of foundation pit excavation, is an uninterrupted data acquisition process for a long time, has synchronous and continuous data, is beneficial to early judgment of the trend of structural damage, and takes remedial measures in time.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The foundation pit stability monitoring and steel support axial force control device is characterized by comprising a main body box (1), a solar power storage module, a foundation pit stability monitoring module, a steel support axial force control module and a steel support (13);
the main body box (1) is used as a supporting body to support the solar energy power storage module, the foundation pit stability monitoring module and the steel support axial force control module;
the solar energy storage module is used for supplying power to the foundation pit stability monitoring module and the steel support axial force control module;
the foundation pit stability monitoring module is used for acquiring foundation pit stability monitoring data; the foundation pit stability monitoring data comprise inclination angle data of the underground continuous wall, axial strain data of the steel support and sedimentation data at measuring points of the underground continuous wall;
the steel support axial force control module is used for acquiring foundation pit stability monitoring prediction data through the foundation pit stability monitoring data so as to adjust the axial force applied to the steel support (13) according to the foundation pit stability monitoring prediction data;
the steel support (13) is used for supporting the diaphragm wall.
2. The foundation pit stability monitoring and steel support axial force control device according to claim 1, wherein the main body box (1) comprises an upper cover plate (101), a reinforced steel plate (102), a middle plate (105), a support plate (107), a bottom plate (110) and a steel support connecting part;
the reinforced steel plate (102) is fixedly arranged on the foundation pit side wall (5); the upper cover plate (101) is vertically fixed on one side, far away from the foundation pit side wall (5), of the top of the reinforced steel plate (102); the bottom plate (110) is vertically fixed on one side, far away from the foundation pit side wall (5), of the bottom of the reinforced steel plate (102), and the bottom plate (110) is parallel to the upper cover plate (101); the middle plate (105) is arranged between the upper cover plate (101) and the bottom plate (110) in parallel, and the middle plate (105) is vertically fixed on the reinforced steel plate (102);
the steel support connecting part is respectively connected with the upper cover plate (101) and the bottom plate (110) in a sliding way; the steel support (13) is fixedly arranged on one side of the connecting part of the steel support, which is far away from the reinforced steel plate (102); the other side of the steel support is abutted with the ground connecting wall (7).
3. A foundation pit stability monitoring and steel support shaft force control device according to claim 2, characterized in that the steel support connection comprises two first sliding wings (103 a), a second sliding wing (103 b) and a casing wall (104);
one end of the first sliding wing plate (103 a) is fixedly arranged on the outer side wall of the casing wall (104), and the other end of the first sliding wing plate is in sliding connection with the upper cover plate (101) along the direction perpendicular to the reinforced steel plate (102); one end of the second sliding wing plate (103 b) is fixedly arranged on the outer side wall of the casing wall (104), and the other end of the second sliding wing plate is in sliding connection with the bottom plate (110) along the direction perpendicular to the reinforced steel plate (102); the side, far away from the reinforced steel plate (102), of the pile casing wall (104) is fixedly connected with the steel support (13), and the steel support (13) and the pile casing wall (104) are coaxially arranged; the end part of the pile casing wall (104) far away from one side of the steel support (13) is fixedly provided with a support plate (107), and the support plate (107) is perpendicular to the axis of the pile casing wall (104).
4. The foundation pit stability monitoring and steel support axial force control device according to claim 2, wherein an upper cover plate chute (109) is arranged on the side of the upper cover plate (101) facing the bottom plate (110); the central line of the upper cover plate chute (109) is perpendicular to the reinforced steel plate (102); the bottom plate (110) is provided with a bottom plate chute (106) corresponding to the upper cover plate chute (109);
the steel support connecting part is in sliding connection with the upper cover plate (101) through the upper cover plate sliding groove (109); and the steel support connecting part is connected with the bottom plate (110) in a sliding way through the bottom plate sliding groove (106).
5. The foundation pit stability monitoring and steel support shaft force control device according to claim 2, characterized in that the solar battery module comprises the solar device (2) and the battery device (3),
the solar device (2) is arranged at the top of the upper cover plate (101) so as to acquire solar energy and convert the solar energy into electric energy;
the storage battery device (3) is connected with the solar device (2) and is used for storing electric energy acquired by the solar device (2);
the storage battery device (3) is electrically connected with the foundation pit stability monitoring module and the steel support axial force control module so as to supply power to the foundation pit stability monitoring module and the steel support axial force control module.
6. The foundation pit stability monitoring and steel support shaft force control device according to claim 2, characterized in that the top of the upper cover plate (101) is provided with an upper cover plate groove (108) for accommodating the solar device (2).
7. The foundation pit stability monitoring and steel support axial force control device according to claim 2, wherein the foundation pit stability monitoring module comprises a data monitoring host (4), an inclinometer device (6), a strain gauge device (8) and a static level device (9);
the inclinometer device (6) is fixedly arranged on the reinforcing plate (102) and is used for acquiring inclination angle data of the underground continuous wall;
the strain gauge device (8) is fixedly arranged on the inner side of the casing wall (104) and used for acquiring axial strain data of the steel support;
the static level device (9) is fixedly arranged on the middle plate (105) and is used for acquiring settlement data at a measuring point of the underground continuous wall;
the data monitoring host (4) is respectively and electrically connected with the inclinometer device (6), the strain gauge device (8) and the static level device (9) so as to acquire inclination angle data of the underground continuous wall, axial strain data of the steel support and sedimentation data at measuring points of the underground continuous wall; the data monitoring host (4) is fixedly arranged in the main body box (1).
8. The foundation pit stability monitoring and steel support axial force control device according to claim 2, wherein the steel support axial force control module comprises an axial force support device and a steel support control system;
the axial force supporting device comprises a hydraulic cylinder control valve module and a hydraulic cylinder (10); the bottom of the hydraulic cylinder (10) is fixedly arranged on the reinforced steel plate (102), the top of the hydraulic cylinder is propped against the steel support connecting part, and the hydraulic cylinder control valve module is used for controlling hydraulic oil to enter and exit the hydraulic cylinder (10);
the steel support control system comprises a control unit (14) and a hydraulic pump station;
the control unit (14) is electrically connected with the data monitoring host (4) so as to control the axial force supporting device according to the stability monitoring prediction data of the foundation pit and adjust the axial force applied to the steel support;
the control unit (14) controls the axial force supporting device through the hydraulic pump station.
9. A method of controlling a foundation pit stability monitoring and steel support shaft force control device according to any one of claims 1-8, wherein the control unit controls the shaft force support device as follows:
s1: acquiring foundation pit stability monitoring data, wherein the foundation pit stability monitoring data comprise inclination angle data of a diaphragm wall, axial strain data of a steel support and sedimentation data at measuring points of the diaphragm wall;
s2: acquiring a historical monitoring time sequence of the previous m times of monitoring according to the foundation pit stability monitoring data so as to acquire a training set of the historical monitoring time sequence; the historical monitoring time series of the previous m times of monitoring comprises a time series training set of the previous m times of monitoring of the inclination angle data of the diaphragm wall, a time series training set of the previous m times of monitoring of the axial strain data of the steel support, and a time series training set of the previous m times of monitoring of the sedimentation data at the measuring point of the diaphragm wall;
s3: acquiring a monitoring predicted value of the (m+1) th time according to the training set of the historical monitoring time sequence; the m+1th monitoring predicted value comprises an m+1th monitoring predicted value of inclination angle data of the diaphragm wall, an m+1th monitoring predicted value of axial strain data of the steel support, and an m+1th monitoring predicted value of settlement data at a diaphragm wall measuring point;
s4: and controlling the axial force applied to the axial force supporting device according to the m+1th monitoring predicted value so as to control the axial force applied to the steel support.
10. The method for controlling a foundation pit stability monitoring and steel support shaft force control device according to claim 9, wherein,
the m+1th monitoring predicted value is obtained as follows:
y m+1,k ＝W 0 Y k +W m X m +W m-1 X m-1 +W m-2 X m-2 +…+W m-p+1 X m-p+1 +∈
wherein: y is m+1,k A predictive value representing the m+1th phase of the kth monitored term; w (W) o P (1)<p.ltoreq.m) the coefficient of the target value of phase; y is k A monitor value representing the kth monitor item in the previous p-phase; w (W) m-p+1 Coefficients representing the feature vector of the previous p-phase, X m-p+1 A feature vector representing the previous p-phase; e is a coefficient subject to gaussian distribution.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117390739A (en) * | 2023-09-11 | 2024-01-12 | 北京市政建设集团有限责任公司 | Stability evaluation method and device for underground wall joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117390739A (en) * | 2023-09-11 | 2024-01-12 | 北京市政建设集团有限责任公司 | Stability evaluation method and device for underground wall joint |
| CN117390739B (en) * | 2023-09-11 | 2024-05-07 | 北京市政建设集团有限责任公司 | Stability evaluation method and device for underground wall joint |
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