Stress balance regulation and control device, system and method for prestress supporting system

Abstract

The invention discloses a stress balance regulation and control device, system and method for a prestress supporting system, relates to the technical field of stress regulation, and can solve the problem that the prestress supporting system carries out targeted stress balance regulation and control on a soil body around a deep foundation pit. The stress balance regulation and control method of the prestress supporting system comprises the steps that the pressure ratios of a plurality of pressure sensor sets are obtained, and a pressure ratio matrix of the pressure sensor sets is constructed; judging whether a pressure unbalance risk area exists or not according to the pressure ratio matrix, if yes, giving an alarm, and if not, repeating the steps; determining a regulation and control node group based on the pressure imbalance risk area; a control signal is issued to the corresponding stress regulation and control unit, and a stress regulation and control action is executed; acquiring a pressure ratio corresponding to the pressure imbalance risk area, and constructing a temporary pressure ratio matrix; and judging whether the pressure unbalance risk area is removed or not, if yes, outputting risk removal display and repeating the above steps, and if not, turning to a regulation and control node group determination step.

Description

Technical Field

[0001] The present invention relates to the technical field of stress regulation, and in particular to a stress balance regulating device, system and method for a prestressed support system. Background Art

[0002] The foundation pit support system is mainly a reinforcement and protection measure taken to ensure the safety of underground structure construction and its surrounding areas. Common support forms include pile support, rigid sheet pile support, soil nail wall support, support in the foundation pit and many other support forms. However, conventional support forms are generally passive support based on soil pressure. Once the soil pressure exceeds the design value, the risk of foundation pit collapse increases sharply, and it is difficult to adjust the support force.

[0003] The current new support systems, such as the fish belly beam support system, can actively apply a certain amount of prestress to the soil around the foundation pit through the cables of the support system. However, since the soil layer conditions at various locations around the foundation pit are not the same, after actively applying the preset prestress, the state of the soil around the foundation pit is difficult to monitor and adjust. It is easy to cause the stability of the overall support to decrease due to unstable force balance, and even the support structure to fail. Therefore, it is urgent to solve the problem of difficult targeted adjustment of the stress balance of the current support system.

[0004] Based on the above background, the inventor has designed a stress balance control device, system and method for a prestressed support system to solve at least one of the above problems, and thus proposed the present application. Summary of the invention

[0005] The purpose of this application is to provide a stress balance control device, system and method for a prestressed support system, which can construct a dot matrix monitoring and control system based on the soil around the deep foundation pit, monitor and control the dynamic balance of active-passive earth pressure of the soil around the deep foundation pit, and solve the problem that conventional prestressed support systems are difficult to perform targeted stress balance control on the soil around the deep foundation pit.

[0006] In order to solve the above technical problems, the present invention adopts the following solutions: On the one hand, the present application provides a stress balance control method for a prestressed support system, which specifically includes the following steps: S1. Obtain the pressure ratios of multiple pressure sensor groups multiple times within a unit time, and construct a pressure ratio matrix with multiple pressure sensor group node coordinates; S2. Determine whether there is a pressure imbalance risk area based on the pressure ratio matrix constructed multiple times. If so, alarm and go to S3. If not, go to S1. S3. Based on the pressure imbalance risk area, determine the control node group that needs stress adjustment; S4, sending a control signal to the stress control unit of the control node group to execute the stress control action; S5. Obtain the pressure ratio of the pressure sensor group corresponding to the pressure imbalance risk area, and construct a temporary pressure ratio matrix after the stress control action; S6. Determine whether the pressure imbalance risk area is lifted according to the temporary pressure ratio matrix. If so, output the risk release display and go to S1. If not, go to S3.

[0007] Optionally, in S2, the following steps are specifically included: S21, constructing a rectangular coordinate system with time as the abscissa and pressure ratio as the ordinate; S22, importing the pressure ratio values ​​obtained multiple times per unit time at one of the nodes in the pressure ratio matrix into a rectangular coordinate system; S23, connecting multiple pressure ratios in the rectangular coordinate system to form a pressure ratio change curve per unit time for the node; S24, judging whether the node is a risk node according to the pressure ratio change curve; S25, repeat the above steps until all nodes are judged; S26. Outputting the presence or absence of a pressure imbalance risk area based on the judgment results of all nodes.

[0008] Optionally, in S3, the stress control unit of the control node coordinate group includes a core stress control node and an auxiliary stress control node; The core stress control nodes correspond to the medium-risk nodes in S25; The auxiliary stress control nodes correspond to the nodes adjacent to the risk nodes in S25.

[0009] Optionally, in S21, a pressure ratio fluctuation zone is provided in a rectangular coordinate system; In S24, it is necessary to determine whether the corresponding node is a risk node based on the slope of the pressure ratio change curve and its ratio to the pressure ratio fluctuation area: Non-risk node: more than 80% of the pressure ratio change curves are within the pressure ratio fluctuation area, and the slope does not exceed the threshold range; Collapse risk node: more than 80% of the pressure ratio change curves are outside the pressure ratio fluctuation area, with a negative slope and exceeding the threshold range; Overload risk node: More than 80% of the pressure ratio change curves are outside the pressure ratio fluctuation area, with a positive slope and exceeding the threshold range.

[0010] Optionally, in S24, the pressure ratio fluctuation range is: 1 to 3; The threshold range for slope is: -0.5 to 1.

[0011] Optionally, in S1 to S6, the following actions are also performed synchronously: S1, obtaining the inclination values ​​of multiple inclination sensors and constructing an inclination value matrix with the inclination sensor node coordinates; S2: Determine whether there is a collapse risk area based on the inclination value matrix. If yes, alarm and go to S3; if no, go to S1; S3. Determine the corresponding stress adjustment mechanism based on the collapse risk area; S4, sending a control signal to the stress adjustment mechanism; S5, obtaining the inclination value of the inclination sensor corresponding to the collapse risk area, and constructing a temporary inclination value matrix after the stress control action; S6. Determine whether the collapse risk area has been lifted based on the temporary inclination value matrix. If so, output the risk lifting display and go to S1. If not, go to S3.

[0012] Optionally, before determining the control node coordinate group and the stress adjustment mechanism, it is necessary to determine whether the collapse risk area and the pressure imbalance risk area overlap: If so, in S4, the stress control unit corresponding to the overlapping risk area of ​​the collapse risk area and the pressure imbalance risk area stops executing the stress control action.

[0013] Optionally, before S1, also include: S0. Obtain multiple groups of pressure sensor group layout location nodes including soil pressure sensors and support pressure sensors, as well as multiple inclination sensor layout location nodes, and construct pressure node coordinate matrices and inclination node coordinate matrices of the pressure sensor group and the inclination sensor respectively based on the three-dimensional coordinate system.

[0014] On the other hand, the present application provides a stress balance control device for a prestressed support system, comprising: A perception module that performs data monitoring and a control module that performs stress control actions; The sensing module includes a pressure sensor group for collecting pressure data inside and outside the soil body and on the side wall of the deep foundation pit; The control module includes stress control units which are distributed in a dot matrix on the side wall of the deep foundation pit and are used to perform stress control actions; The pressure sensor groups are distributed in a dot matrix and correspond to the stress regulating units.

[0015] In a third aspect, the present application provides a stress balance control system for a prestressed support system, comprising: one or more processors; A storage unit is used to store one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors can implement any one of the above-mentioned stress balance control methods for a prestressed support system.

[0016] Beneficial effects of the present invention: 1. This application constructs multiple groups of soil pressure-support pressure pressure sensor groups to realize dynamic balance monitoring of the surrounding walls and surrounding soil of the deep foundation pit, and timely and targeted regulation of pressure imbalance nodes, thereby reducing the collapse risk and shear failure risk of the soil around the deep foundation pit, and effectively solving the problem that conventional prestressed support systems are difficult to carry out targeted stress balance regulation of the soil around the deep foundation pit.

[0017] 2. Based on stress balance monitoring and regulation, this application also conducts real-time monitoring and regulation of the inclination value of the surrounding wall of the deep foundation pit, which can further reduce the collapse risk of the soil around the deep foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a system flow chart of Example 1 of the present application.

[0019] Figure 2 A schematic diagram of some nodes of the pressure ratio matrix constructed four times in succession in Example 1 of the present application; Figure 3 A schematic diagram of a pressure ratio matrix constructed based on four times in Example 1 of the present application, a rectangular coordinate system constructed for determining the B2 node, and a pressure variation curve thereof; Figure 4 This is a schematic diagram of the pressure imbalance risk area after determining that the B2 node is an overload risk node in Example 1 of the present application; Figure 5 This is a schematic diagram of the core stress control node and the auxiliary stress control node after the B2 node is determined to be an overload risk node in Example 1 of the present application.

[0020] Figure 6 This is a schematic diagram of module connection in Example 2 of the present application.

[0021] Figure 7 It is a schematic diagram of the top view of the structure after the control module and the supporting structure in Example 2 of the present application are arranged in the deep foundation pit. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0023] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] Embodiment 1: like Figures 1 to 5 As shown, this embodiment provides a stress balance control method for a prestressed support system, which specifically includes the following steps: S1. Obtain the pressure ratios of multiple pressure sensor groups multiple times within a unit time, and construct a pressure ratio matrix with multiple pressure sensor group node coordinates; S2. Determine whether there is a pressure imbalance risk area based on the pressure ratio matrix constructed multiple times. If so, alarm and go to S3. If not, go to S1. S3. Based on the pressure imbalance risk area, determine the control node group that needs stress adjustment; S4, sending a control signal to the stress control unit of the control node group to execute the stress control action; S5. Obtain the pressure ratio of the pressure sensor group corresponding to the pressure imbalance risk area, and construct a temporary pressure ratio matrix after the stress control action; S6. Determine whether the pressure imbalance risk area is lifted based on the temporary pressure ratio matrix. If so, output the risk release display and go to S1. If not, go to S3.

[0027] The single group of pressure sensor groups in this embodiment includes soil pressure sensors and support pressure sensors corresponding to each other. The soil pressure sensors and support pressure sensors in the same group of pressure sensor groups have the same height, and the connecting lines of the soil pressure sensors and support pressure sensors in the same group are perpendicular to the side walls of the deep foundation pit. The force direction of the soil pressure sensor is perpendicular to the side walls of the foundation pit. The support pressure sensor is located between the side walls of the deep foundation pit and the support structure of the support system. The deep foundation pit has multiple groups of pressure sensor groups distributed in a dot matrix along its circumference, so that the multiple groups of pressure sensor groups can monitor the pressure balance trend of the soil around the deep foundation pit in real time. After the soil pressure sensor is buried in the soil, the soil pressure sensor can monitor the active pressure in the soil around the deep foundation pit, that is, active pressure monitoring. After the support pressure sensor is arranged, after the support system applies prestress to the soil to cause the soil to deform, the support pressure sensor can be used to measure the reaction force of the deformed soil on the support structure, that is, passive pressure monitoring, thereby constructing several groups of pressure sensing detection groups around the deep foundation pit soil that can perform active-passive pressure dynamic monitoring.

[0028] This embodiment further adjusts the stress of the support structure in a targeted manner based on the monitoring results of the active-passive pressure, thereby solving the technical problems raised in the background technology.

[0029] Therefore, this embodiment constructs multiple groups of soil pressure-support pressure pressure sensor groups to realize dynamic balance monitoring of the surrounding walls and surrounding soil of the deep foundation pit, and timely and targeted regulation of pressure imbalance nodes, thereby reducing the collapse risk and shear failure risk of the soil around the deep foundation pit, and effectively solving the problem that conventional prestressed support systems are difficult to carry out targeted stress balance regulation in the soil around the deep foundation pit.

[0030] In this embodiment, the method of constructing the temporary pressure ratio matrix in S5 is the same as the method of constructing the pressure ratio matrix in S1, and the method of judging whether the pressure imbalance risk area is released in S6 is the same as the method of judging whether the pressure imbalance risk area exists in S2.

[0031] In this embodiment, after it is determined in S2 that the pressure imbalance risk area does not exist, or after it is determined in S6 that the pressure imbalance risk area is lifted, before turning to S1, an interval time may be set, such as 10 seconds or 15 seconds, or other interval times may be set, which will not be detailed here.

[0032] Specifically, in this embodiment, in S2, the following steps are specifically included: S21, constructing a rectangular coordinate system with time as the abscissa and pressure ratio as the ordinate; S22, importing the pressure ratio values ​​obtained multiple times per unit time at one of the nodes in the pressure ratio matrix into a rectangular coordinate system; S23, connecting multiple pressure ratios in the rectangular coordinate system to form a pressure ratio change curve per unit time for the node; S24, judging whether the node is a risk node according to the pressure ratio change curve; S25, repeat the above steps until all nodes are judged; S26. Outputting the presence or absence of a pressure imbalance risk area based on the judgment results of all nodes.

[0033] In this embodiment, the pressure ratio of a single node is the ratio of data monitored by the same group of support pressure sensors and soil pressure sensors. Under normal operating conditions, the pressure ratio should fluctuate within a fixed range. If an abnormal operating condition occurs, such as a pressure ratio that is too high, it means that the passive pressure on the support structure is too large, and the support structure at the corresponding node is overloaded. It is necessary to reduce the support pressure of the corresponding node. Conversely, if the pressure ratio is too low, it means that the passive pressure on the support structure is too low, and the soil is at risk of collapsing outwards. It is necessary to increase the support pressure of the corresponding node.

[0034] In some embodiments, the pressure ratio in the above steps S1 to S6 can also be replaced by the pressure difference between the soil pressure sensor and the support pressure sensor. A pressure difference matrix is ​​constructed according to the pressure difference of multiple groups of pressure sensor groups to form a pressure difference change curve. The node is then judged whether it is a risk node according to the pressure difference change curve. If the pressure difference change curve is within the designated range, it can be said that the node is in normal working conditions. If an abnormal working condition occurs, if the pressure difference is too large, it means that the passive pressure on the support structure is too large, and the support structure of the corresponding node is overloaded. It is necessary to reduce the support pressure of the corresponding node. On the contrary, if the pressure ratio is too low or even negative, it means that the soil pressure is greater than the support pressure, and the soil is at risk of collapsing outward, and it is necessary to increase the support pressure of the corresponding node.

[0035] Specifically, in this embodiment, in S3, the stress control unit of the control node coordinate group includes a core stress control node and an auxiliary stress control node; The core stress control nodes correspond to the medium-risk nodes in S25; The auxiliary stress control nodes correspond to the nodes adjacent to the risk nodes in S25.

[0036] In this embodiment, the nodes corresponding to the auxiliary stress regulation nodes are all nodes that are not determined as risk nodes in S24.

[0037] In S4, when a control signal is sent to the stress control unit of the control node group, the auxiliary stress control node needs to be multiplied by the auxiliary coefficient in advance. The auxiliary coefficient ranges from 0.3 to 0.7. The auxiliary coefficient can be preset in advance or the technician can determine the soil system coefficient according to the soil type.

[0038] Specifically, in this embodiment, if Figure 3 As shown, in S21, a pressure ratio fluctuation area is provided in the rectangular coordinate system; In S24, it is necessary to determine whether the corresponding node is a risk node based on the slope of the pressure ratio change curve and its ratio to the pressure difference fluctuation area: Non-risk node: more than 80% of the pressure ratio change curves are within the pressure ratio fluctuation area, and the slope does not exceed the threshold range; Collapse risk node: more than 80% of the pressure ratio change curves are outside the pressure ratio fluctuation area, with a negative slope and exceeding the threshold range; Overload risk node: More than 80% of the pressure ratio change curves are outside the pressure ratio fluctuation area, with a positive slope and exceeding the threshold range.

[0039] The technicians can set the ratio of the pressure ratio change curve to the pressure ratio fluctuation zone as needed. Under the same upper and lower limits of the pressure ratio fluctuation zone, the slope of the pressure ratio change curve corresponding to the non-risk node will be smaller as the unit time is extended.

[0040] Specifically, in this embodiment, in S24, the pressure ratio fluctuation range is: 1 to 3; The threshold range of the slope is: -0.5 to 1. The technicians can set the upper and lower limits of the pressure ratio fluctuation zone and the threshold range of the slope as needed, which will not be described in detail here.

[0041] like Figures 2 to 4 As shown, it illustrates a schematic diagram of some nodes of a pressure ratio matrix that is constructed four times in succession, wherein each node, such as the B2 node, corresponds to the layout position of the pressure sensor group. After the pressure ratio matrix is ​​constructed four times, the pressure ratio of the B2 node is imported into the rectangular coordinate system, and the four points are connected as a curve. The ratio of the pressure ratio change curve corresponding to the B2 node to the pressure ratio fluctuation area, as well as its total slope, can be determined. In this embodiment, the B2 node can be determined as an overload risk node based on the above data. Based on the fact that the B2 node is an overload risk node, the b2 node corresponding to the B2 node can be established as a core stress control node, and a2, b1, b3, and c2 can be established as auxiliary stress control nodes.

[0042] Specifically, Figure 1 As shown, in this embodiment, in S1 to S6, the following actions are also performed synchronously: S1, obtaining the inclination values ​​of multiple inclination sensors and constructing an inclination value matrix with the inclination sensor node coordinates; S2: Determine whether there is a collapse risk area based on the inclination value matrix. If yes, alarm and go to S3; if no, go to S1; S3. Determine the corresponding stress adjustment mechanism based on the collapse risk area; S4, sending a control signal to the stress adjustment mechanism; S5, obtaining the inclination value of the inclination sensor corresponding to the collapse risk area, and constructing a temporary inclination value matrix after the stress control action; S6. Determine whether the collapse risk area has been lifted based on the temporary inclination value matrix. If so, output the risk lifting display and go to S1. If not, go to S3.

[0043] This embodiment can further reduce the collapse risk of soil around the deep foundation pit by real-time monitoring and regulating the inclination value of the peripheral wall of the deep foundation pit on the basis of stress balance monitoring and regulation.

[0044] In this embodiment, a second rectangular coordinate system with time as the horizontal coordinate and the inclination value as the vertical coordinate can be constructed according to the inclination value matrix, and whether there is a collapse risk can be judged according to the change direction and magnitude of the inclination value per unit time; If the tilt angle change value is too large and the tilt angle change value is positive, the matrix node corresponding to the tilt sensor is at risk of outward collapse. Conversely, if the tilt angle change value is too large and the tilt angle change value is negative, the matrix node corresponding to the tilt sensor is at risk of inward damage.

[0045] In this embodiment, the maximum deviation angle value of the inclination value can be set, for example, -2° and 2°. Once the inclination value is monitored to deviate from -2° to 2°, an alarm will be immediately sounded, and the monitoring point will be defined as a risk node. According to the inclination value, it is determined whether the node is an outward collapse risk node or an inward destruction risk node, and then the corresponding control signal is sent to the stress adjustment mechanism.

[0046] Specifically, in this embodiment, before determining the control node coordinate group and the stress adjustment mechanism, it is necessary to determine whether the collapse risk area and the pressure imbalance risk area overlap: If so, in S4, the stress control unit corresponding to the overlapping risk area of ​​the collapse risk area and the pressure imbalance risk area cancels the execution of the stress control action to avoid the problem of excessive control-induced risk.

[0047] Specifically, in this embodiment, before S1, the following steps are further included: S0. Obtain multiple groups of pressure sensor group layout location nodes including soil pressure sensors and support pressure sensors, as well as multiple inclination sensor layout location nodes, and construct pressure node coordinate matrices and inclination node coordinate matrices of the pressure sensor group and the inclination sensor respectively based on the three-dimensional coordinate system.

[0048] In some embodiments, technicians can also build a three-dimensional model of the foundation pit based on the three-dimensional coordinate system according to the foundation pit data, import the positions of the pressure sensor group and the inclination sensor into the three-dimensional coordinate system, and display it in the three-dimensional model of the foundation pit. After a risk node appears, the three-dimensional coordinates of the risk node are synchronized in real time to the three-dimensional coordinate system and displayed, so as to intuitively display the risk nodes and risk areas.

[0049] In this embodiment, if the adjustment force of the stress control unit and the stress control mechanism exceeds the threshold and the risk node is still not eliminated, additional diagonal braces can be added as needed to increase the passive support force of the side wall of the deep foundation pit.

[0050] Embodiment 2: like Figure 6 and Figure 7 As shown, this embodiment provides a stress balance control device for a prestressed support system, comprising: A perception module that performs data monitoring and a control module that performs stress control actions; The sensing module includes a pressure sensor group for collecting pressure data inside and outside the soil body and on the side wall of the deep foundation pit; The control module includes stress control units which are distributed in a dot matrix on the side wall of the deep foundation pit and are used to perform stress control actions; The pressure sensor groups are distributed in a dot matrix and correspond to the stress regulating units.

[0051] In this embodiment, the control module also includes a stress adjustment mechanism, which is an adjustment motor that drives the cable to be retracted or released, and the hydraulic unit is pressed between the cable and the side wall of the deep foundation pit.

[0052] Example 3 This embodiment provides a stress balance control system for a prestressed support system, comprising: one or more processors; A storage unit is used to store one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors can implement any one of the above-mentioned stress balance control methods for a prestressed support system.

[0053] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A stress balance control method for a prestressed support system, characterized in that: The following steps are involved: S1, obtaining pressure ratios of multiple pressure sensor groups multiple times within a unit time, and constructing a pressure ratio matrix with multiple pressure sensor group node coordinates; S2. Determine whether there is a pressure imbalance risk area based on the pressure ratio matrix constructed multiple times. If so, alarm and go to S3. If not, go to S1. S3. Based on the pressure imbalance risk area, determine the control node group that needs stress adjustment; S4, sending a control signal to the stress control unit of the control node group to execute the stress control action; S5. Obtain the pressure ratio of the pressure sensor group corresponding to the pressure imbalance risk area, and construct a temporary pressure ratio matrix after the stress control action; S6. Determine whether the pressure imbalance risk area is lifted according to the temporary pressure ratio matrix. If so, output the risk release display and go to S1. If not, go to S3.

2. A stress balance control method for a prestressed support system according to claim 1, characterized in that: In S2, the following steps are specifically included: S21, constructing a rectangular coordinate system with time as the abscissa and pressure ratio as the ordinate; S22, importing the pressure ratio values ​​obtained multiple times per unit time at one of the nodes in the pressure ratio matrix into a rectangular coordinate system; S23, connecting multiple pressure ratios in the rectangular coordinate system to form a pressure ratio change curve per unit time for the node; S24, judging whether the node is a risk node according to the pressure ratio change curve; S25, repeat the above steps until all nodes are judged; S26. Outputting the presence or absence of a pressure imbalance risk area based on the judgment results of all nodes.

3. A stress balance control method for a prestressed support system according to claim 2, characterized in that: In S3, the stress control unit of the control node coordinate group includes a core stress control node and an auxiliary stress control node; The core stress control nodes correspond to the medium-risk nodes in S25; The auxiliary stress control nodes correspond to the nodes adjacent to the risk nodes in S25.

4. The stress balance control method of a prestressed support system according to claim 2 is characterized in that: In S21, a pressure ratio fluctuation zone is provided in a rectangular coordinate system; In S24, it is necessary to determine whether the corresponding node is a risk node based on the slope of the pressure ratio change curve and its ratio to the pressure ratio fluctuation area: Non-risk node: more than 80% of the pressure ratio change curves are within the pressure ratio fluctuation area, and the slope does not exceed the threshold range; Collapse risk node: more than 80% of the pressure ratio change curves are outside the pressure ratio fluctuation area, with a negative slope and exceeding the threshold range; Overload risk node: More than 80% of the pressure ratio change curves are outside the pressure ratio fluctuation area, with a positive slope and exceeding the threshold range.

5. A stress balance control method for a prestressed support system according to claim 4, characterized in that: In S24, the pressure ratio fluctuation range is: 1 to 3; The threshold range for slope is: -0.5 to 1.

6. The stress balance control method of a prestressed support system according to claim 1, characterized in that: In S1 to S6, the following actions are also performed synchronously: S1, obtaining the inclination values ​​of multiple inclination sensors and constructing an inclination value matrix with the inclination sensor node coordinates; S2: Determine whether there is a collapse risk area based on the inclination value matrix. If yes, alarm and go to S3; if no, go to S1; S3. Determine the corresponding stress adjustment mechanism based on the collapse risk area; S4, sending a control signal to the stress adjustment mechanism; S5, obtaining the inclination value of the inclination sensor corresponding to the collapse risk area, and constructing a temporary inclination value matrix after the stress control action; S6. Determine whether the collapse risk area has been lifted based on the temporary inclination value matrix. If so, output the risk lifting display and go to S1. If not, go to S3.

7. A stress balance control method for a prestressed support system according to claim 6, characterized in that: In S3, before determining the control node coordinate group and stress adjustment mechanism, it is necessary to determine whether the collapse risk area and the pressure imbalance risk area overlap: If so, in S4, the stress control unit corresponding to the overlapping risk area of ​​the collapse risk area and the pressure imbalance risk area stops executing the stress control action.

8. The stress balance control method of a prestressed support system according to claim 6, characterized in that: Prior to S1, this also included: S0. Obtain multiple groups of pressure sensor group layout location nodes including soil pressure sensors and support pressure sensors, as well as multiple inclination sensor layout location nodes, and construct pressure node coordinate matrices and inclination node coordinate matrices of the pressure sensor group and the inclination sensor respectively based on the three-dimensional coordinate system.

9. A stress balance control device for a prestressed support system, characterized in that: include: A perception module that performs data monitoring and a control module that performs stress control actions; The sensing module includes a pressure sensor group for collecting pressure data inside and outside the soil body and on the side wall of the deep foundation pit; The control module includes stress control units which are distributed in a dot matrix on the side wall of the deep foundation pit and are used to perform stress control actions; The pressure sensor groups are distributed in a dot matrix and correspond to the stress regulating units.

10. A stress balance control system for a prestressed support system, characterized in that: include: one or more processors; A storage unit, used to store one or more programs, which, when executed by the one or more processors, can enable the one or more processors to implement a stress balance control method for a prestressed support system as described in any one of claims 1 to 8.

Images