Large-area underground engineering construction environment influence active control system and method

Abstract

The invention relates to a large-area underground engineering construction environment influence active control system and method.The system comprises an active control platform system, a PLC, an axial force monitoring device, an executing mechanism, an enclosure monitoring device and an environment monitoring device, and a plurality of supporting structures are arranged in an underground engineering construction area; the execution mechanism is installed at the end of the supporting structure and used for adjusting the supporting axial force. The axial force monitoring device monitors the real-time supporting axial force value of the supporting structure in real time; the enclosure monitoring device and the environment monitoring device are used for monitoring the enclosure deformation condition and the environment safety condition in real time; the active control platform system controls the execution mechanism to act through the PLC based on a preset execution mechanism early warning value and the monitored real-time supporting axial force value, the enclosure deformation condition and the environment safety condition. According to the method, the environment influence deformation control capability is improved, meanwhile, the application range of the active control method is expanded, and the application of the method in the large-area underground engineering construction environment is not limited by the shape of a construction area any more.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly to an active control system and method for the environmental impact of large-area underground engineering construction. Background Art

[0002] In the development of cities, large-scale underground projects are constantly emerging, such as subways, tunnels, underground parking lots, underground commercial plazas, etc. During the construction of these large-scale underground projects, it is inevitable to cause certain impacts on the surrounding environment (such as subways, urban lifelines, surrounding buildings, etc.), and even affect the normal operation of existing buildings or lead to accidents. Therefore, it is very important to implement environmental impact control during the construction of large-scale underground projects.

[0003] For the control of the impact on the surrounding environment, passive control methods are usually adopted, including enhanced structural stiffness design, stepped slope design, addition of isolation piles, construction soil reinforcement, construction in sections and subsections, etc., and this method is widely used. However, with the increasing saturation of urban underground space development, the surrounding environment of large-scale underground project construction is becoming increasingly complex, and the requirements for environmental protection are becoming increasingly strict. For example, the environmental deformation control requirements adjacent to subways, etc. have changed from centimeter level to within 10 mm, and the accuracy requirement is millimeter level. The traditional passive control method can no longer meet the requirements.

[0004] To solve the limitations of the passive control method and meet the high requirements for environmental protection in large-scale underground project construction, especially the precise control of millimeter-level deformation, an active control method has been proposed, usually including methods such as steel support axial force compensation, automatic grouting, and automatic groundwater recharge, and in particular, a large number of applications have been made for steel support axial force compensation devices (or foundation pit micro-deformation control, or hydraulic servo systems). However, this device is usually only applicable to narrow and deep foundation pit projects, and the types of applied projects are limited. And there are also the following limitations: (1) It is impossible to automatically compensate and actively control the monitored axial force; (2) The applied jacking force value needs to be based on the empirical values given by the design and cannot be quantified; (3) The tonnage of the jacking force system is relatively low (generally below 600 t) and cannot meet the compensation for the frequently changing support axial force; (4) The monitored value of the support axial force is an incremental value, the monitoring lags, and the monitoring is carried out after a certain process is completed, and the monitored value of the axial force cannot reflect the real stress situation; (5) The prediction accuracy of the existing environmental impact of foundation pit construction is not high; (6) The linkage control of the deformation monitoring of the retaining structure and the support axial force is not considered, and the safety control refined warning index is lacking. Summary of the Invention

[0005] The present invention provides an active control system and method for the environmental impact of large-area underground engineering construction to solve the above technical problems.

[0006] To solve the above technical problems, the present invention provides an active control system for the environmental impact of large-area underground engineering construction, including an active control platform system, a PLC controller, an axial force monitoring device, an actuator, a retaining structure monitoring device, and an environmental monitoring device.

[0007] Several support structures are provided within the underground engineering construction area, and the actuator is installed at the end of the support structure for adjusting the support axial force.

[0008] The axial force monitoring device monitors the real-time support axial force value of the support structure in real time; the retaining structure monitoring device and the environmental monitoring device monitor the deformation of the retaining structure and the environmental safety situation in real time.

[0009] Based on a preset warning value of the actuator, and the monitored real-time support axial force value, the deformation of the retaining structure, and the environmental safety situation, the active control platform system controls the operation of the actuator through the PLC controller.

[0010] Preferably, the axial force monitoring device includes at least a displacement sensor and a pressure sensor.

[0011] Preferably, the PLC controller controls the extension, retraction, commutation, and axial force increase and decrease adjustment of multiple actuators by controlling the solenoid valve, proportional overflow valve, and pressure regulating valve on the actuator.

[0012] The present invention also provides an active control method for the environmental impact of large-area underground engineering construction, including the following steps:

[0013] Step 1: Set several support structures according to the shape of the underground engineering construction area and the surrounding environment, and install an actuator for adjusting the support axial force on the support structure.

[0014] Step 2: Preset the warning value of the actuator according to the basic situation of the underground engineering and the surrounding environment.

[0015] Step 3: Use the axial force monitoring device to monitor the real-time support axial force value, the retaining structure monitoring device to monitor the deformation of the retaining structure, and the environmental monitoring device to monitor the environmental safety situation.

[0016] Step 4: Based on Step 2 and Step 3, control the operation of the actuator to actively control the surrounding environment.

[0017] Preferably, in Step 1, the support structure is set based on the aspect ratio of the underground engineering construction area.

[0018] Preferably, when the aspect ratio of the length to the width of the underground engineering construction area is greater than a threshold value, the support structure is supported in the width direction; when the aspect ratio of the length to the width of the underground engineering construction area is less than the threshold value, zoning treatment is carried out, and the support structure and the actuator are arranged on the side with high environmental impact control.

[0019] Preferably, in step 2, according to the basic situation of the underground project and the surrounding environment, combined with the finite element calculation method, the deformation control value of the retaining structure is calculated, and based on the deformation control value of the retaining structure, the warning value of the actuator is adjusted and controlled.

[0020] Preferably, step 2 further includes presetting the control value range of each actuator according to the basic situation of the underground project and the surrounding environment.

[0021] Preferably, F X is the control value range set for the Xth actuator, F XT is the recommended warning value of the Xth actuator, F2 is 1060 - 2625 kN, F 2T is 1900 kN; F3 is 1100 - 2625 kN, F 3T is 1900 kN; F4 is 1170 - 5000 kN, F 4T is 2330 kN; F5 is 1100 - 2700 kN, F 5T is 1970 kN; F6 is 1100 - 10000 kN, F 6T is 4690 kN; F7 is 1400 - 4000 kN, F 7T is 3200 kN; F8 is 3600 - 4000 kN, F[[ID=2,6]] 8T is 3730 kN.

[0022] Preferably, the loading method of the actuator includes: for wide-range loading: take half of the warning value of the actuator, round up, and use 200 kN as the loading value each time, and load step by step to the set value; for narrow-range loading: load at a speed of 10 kN / hour until the deformation situation meets the requirements.

[0023] Compared with the prior art, the active control system and method for the construction environment impact of large-area underground projects provided by the present invention have the following advantages:

[0024] 1. The present invention effectively controls the deformation of the retaining structure by using the axial force monitoring device, the retaining structure monitoring device and the environmental monitoring device to monitor the construction environment and the deformation situation in real time, and actively applying the axial force compensation force, realizing high-precision control of the construction environment impact of large-area underground projects;

[0025] 2. The present invention expands the application range of the active control method, and the application in the construction environment of large-area underground projects is no longer limited by the shape of the construction area. Brief Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the active control system for the environmental impact of large - area underground engineering construction in a specific embodiment of the present invention;

[0027] Figures 2a to 2d It is an application schematic diagram of the active control system for the environmental impact of large - area underground engineering construction in a specific embodiment of the present invention;

[0028] Figure 3a It is a top - view of the environmental impact of large - area underground engineering construction in a specific embodiment of the present invention;

[0029] Figure 3b It is a sectional view of the environmental impact of large - area underground engineering construction in a specific embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the warning value of the actuator in a specific embodiment of the present invention;

[0031] Figure 5 It is a flowchart of the active control method for the environmental impact of large - area underground engineering construction in a specific embodiment of the present invention;

[0032] Figure 6 It is a schematic diagram of the maximum value of the horizontal deformation of the tunnel in the implementation effect of a specific embodiment of the present invention;

[0033] Figure 7a and 7b It is a comparison diagram of the lateral displacement of the retaining structure in the implementation effect of a specific embodiment of the present invention.

[0034] In the figure: 01 - underground engineering construction area, 02 - tunnel; 10 - active control platform system, 20 - PLC controller, 31 - displacement sensor, 32 - pressure sensor, 40 - actuator, 41 - support structure, 50 - retaining structure monitoring device, 60 - environmental monitoring device. Specific Embodiment

[0035] In order to describe the technical solutions of the above - mentioned invention in more detail, the following specific examples are listed to prove the technical effects; it should be emphasized that these examples are used to illustrate the present invention and not to limit the scope of the present invention.

[0036] The active control system for the environmental impact of large - area underground engineering construction provided by the present invention, as Figure 1 shown, includes an active control platform system 10, a PLC controller 20, an axial force monitoring device, an actuator 40, a retaining structure monitoring device 50, and an environmental monitoring device 60. In some embodiments, the axial force monitoring device includes at least a displacement sensor 31 and a pressure sensor 32.

[0037] There are several support structures 41 in the underground engineering construction area 01, and the actuator 40 is installed at the end of the support structure 41 for adjusting the support axial force;

[0038] The axial force monitoring device monitors the real-time support axial force value of the support structure 41 in real time; the retaining structure monitoring device 50 and the environmental monitoring device 60 monitor the deformation of the retaining structure and the environmental safety situation in real time;

[0039] The active control platform system 10 controls the action of the actuator 40 through the PLC controller 20 based on the preset warning value of the actuator, as well as the monitored real-time support axial force value, the deformation of the retaining structure, and the environmental safety situation, and actively applies an axial force compensation force, so as to effectively control the deformation of the retaining structure and achieve high-precision control of the environmental impact of large-area underground engineering construction; the present invention also expands the application range of the active control method, and the application in the large-area underground engineering construction environment is no longer limited by the shape of the construction area.

[0040] In some embodiments, please continue to refer to Figure 1 , the PLC controller controls the solenoid valve, proportional relief valve and pressure regulating valve on the actuator to control the extension, retraction and commutation of the multiple actuators respectively, as well as the adjustment of the increase and decrease of the axial force.

[0041] The working process of the active control system for the environmental impact of large-area underground engineering construction provided by the present invention is as follows: initially select the control index of the support axial force according to the foundation pit overview, input the corresponding value through the active control platform system 10, send an instruction to the PLC controller 20, control the multiple actuators 40 by controlling the solenoid valve, proportional relief valve and pressure regulating valve, realize the extension and retraction commutation of the actuator 40, the precise increase or decrease of the axial force, and the supplement of the axial force; monitor and control the support axial force and stroke in real time through the displacement sensor 31 and the pressure sensor 32, and then monitor the deformation of the retaining structure through the retaining structure monitoring device (such as a displacement sensor), and send the retaining structure deformation monitoring data to the active control platform system 10. Through comparison and analysis with the preset warning value of the actuator, when the warning value is exceeded, send the axial force control value and instruction to the PLC controller 20, increase the axial force of the corresponding actuator, and then monitor the deformation of the retaining structure through the retaining structure monitoring device 50, and assist in monitoring the safety status of the environment of adjacent buildings through the environmental monitoring device (such as a displacement sensor), so as to effectively control the safety of the surrounding construction environment.

[0042] The present invention also provides an active control method for the environmental impact of large-area underground engineering construction, as Figure 5 shown, including the following steps:

[0043] Step 1: Set up a number of support structures 41 according to the shape of the underground engineering construction area 01 and the surrounding environment, and install an actuator 40 for adjusting the support axial force on the support structure 41. The specific installation steps may sequentially include: installing the support platform of the actuator 40, hoisting the support structure 41 with a box body, placing and fixing the actuator 40 at one end of the support structure 41, fixing the other end of the support structure 41, and applying a preloading force, etc.

[0044] Step 2: Preset the warning value of the actuator according to the basic situation of the underground project and the surrounding environment;

[0045] Step 3: Use an axial force monitoring device to monitor the real-time support axial force value, a retaining structure monitoring device 50 to monitor the deformation of the retaining structure, and an environmental monitoring device 60 to monitor the environmental safety situation;

[0046] Step 4: Control the action of the actuator 40 based on Step 2 and Step 3 to actively control the surrounding environment.

[0047] Using the above method can solve the problem of fine deformation control in the construction of large-scale underground projects under the increasingly strict environmental protection of adjacent structures such as subways, improve the ability to control environmental impact deformation (usually within 10 mm), expand the application scope of the active control method, which is no longer limited to the construction of narrow foundation pits. At the same time, the application in the construction environment of large-area underground projects is not restricted by the shape of the construction area.

[0048] In some embodiments, in Step 1, the support structure 41 can be set based on the aspect ratio of the underground engineering construction area 01. Specifically, when the aspect ratio (L / D) of the underground engineering construction area 01 ≥ a threshold value (such as 3 - 5), and the construction environment requirements for the tunnel 02, etc. are relatively high (deformation ≤ 10 mm), the support structure 41 directly supports in the width direction, and the actuator 40 is set as shown in Figure 2a When the aspect ratio (L / D) of the underground engineering construction area 01 < the threshold value (such as 3 - 5), and the construction environment requirements for the tunnel 02, etc. are relatively high (deformation ≤ 10 mm), zoning treatment is carried out on the side with higher environmental impact control. The support structure 41 and the actuator 40 are set on the side with higher environmental impact control, as shown in Figure 2b 、 2c and 2d, where, Figure 2b the construction environment such as the tunnel 02 in corresponds to a single tunnel; Figure 2c the construction environment such as the tunnel 02 in corresponds to multiple tunnels; Figure 2d the underground engineering construction area 01 in is an annular circular foundation pit, covering a variety of construction environments. That is to say, the setting of the actuator 40 can be not restricted by the shape of the underground engineering construction area 01. In addition, in this embodiment, the single-tonnage of the actuator 40 ≥ 600 t, and the stroke ≥ 250 mm, which can be applicable to a variety of working conditions.

[0049] In some embodiments, in step 2, according to the basic conditions of the underground project and the surrounding environment conditions, the deformation control value of the retaining structure is calculated by combining the finite element calculation method, and the warning value of the actuator is adjusted and controlled based on the deformation control value of the retaining structure. Specifically, first, according to the basic conditions of the underground project and the surrounding environment conditions, the number of channels N of the actuator 40 is set in combination with the number of channels of the support structure 41. As shown in FIG. 3, in the figure, L is the length of the underground project construction area 01, D is the width of the underground project construction area 01, h is the depth of the opening of the underground project construction area 01, d is the distance from the tunnel center of the tunnel 02 to the retaining structure of the underground project construction area 01, H is the buried depth of the tunnel 02, n is the number of tunnels 02, and α is the included angle between the tunnel 02 and the foundation pit. Of course, the tunnel 02 can be replaced by other construction environments such as pipelines and buildings.

[0050] Then, for the Xth actuator 40, the warning index of this actuator 40 is preset, such as Figure 4 shown. Figure 4 In, F X is the control value range set for the Xth actuator 40, F XT is the recommended warning value of the Xth actuator 40. In this embodiment, F2 is 1060 - 2625 kN, F 2T is 1900 kN; F3 is 1100 - 2625 kN, F 3T is 1900 kN; F4 is 1170 - 5000 kN, F 4T is 2330 kN; F5 is 1100 - 2700 kN, F 5T is 1970 kN; F6 is 1100 - 10000 kN, F 6T is 4690 kN; F7 is 1400 - 4000 kN, F 7T is 3200 kN; F8 is 3600 - 4000 kN, F 8T is 3730 kN. According to the basic conditions of the underground project and the surrounding environment conditions, the deformation control value of the retaining structure can be calculated by combining methods such as finite element calculation, and the warning index of the actuator 40 can be adjusted and controlled.

[0051] After the actuator 40 is installed, the excavation construction of the underground project construction area 01 can be carried out, and the deformation of the construction environment such as the tunnel 02 is actively controlled according to the Figure 5 shown process.

[0052] Specifically, it includes:

[0053] Determine the control value based on the construction deformation of the retaining structure of the underground engineering construction area 01 predicted in the process, determine the design value of the axial force, determine the final warning value of the actuator, and determine the loading scheme of the actuator 40. Taking the second support as an example, the excavation of the foundation pit will cause the deformation of the retaining structure and at the same time cause an increase in the axial force. 1. For wide-range loading: Take half of the warning value of 1900 kN and round up. Use 200 kN as the loading value each time and load step by step to 1000 kN; 2. For narrow-range precise loading: Load precisely at a speed of 10 kN / h until the deformation meets the requirements; usually, the axial force of the second support does not exceed 1900 kN and the deformation meets the requirements.

[0054] Then carry out the excavation construction of the underground engineering construction area 01. According to Figure 1 the active control system for the environmental impact of large-area underground engineering construction controls the installed actuator 40 to achieve the active control of the retaining structure of large-area underground engineering and the surrounding environmental impact, that is, adaptively adjust the axial force value of the support structure according to the deformation of the retaining structure. Until the axial force returns to the normal value, that is, the adjusted axial force value remains unchanged.

[0055] After the construction is completed, remove the actuator 40, which specifically includes steps such as unlocking the actuator 40, retracting the actuator 40, hoisting the actuator 40, and removing the actuator 40.

[0056] Figure 6 And Fig. 7 is an example of the application effect of the control system and method provided by the present invention. Figure 6 It is a schematic diagram of the change of the maximum value of the tunnel horizontal deformation with the calculation analysis step. Figure 7a It is a schematic diagram of the lateral displacement of the retaining structure after applying the control system and method provided by the present invention. Figure 7b It is a schematic diagram of the lateral displacement of the retaining structure when the control system and method provided by the present invention are not applied. From Figure 6 and Fig. 7, it can be seen that the tunnel horizontal direction increases with the increase of the excavation depth and reaches the maximum (9.0 mm) after the excavation of the fifth layer of soil; if the initial displacement of the tunnel (5.2 mm) is not considered, the increased value of the positive deformation in the tunnel horizontal direction caused by the construction is 3.8 mm; the maximum value of the negative deformation in the tunnel horizontal direction decreases first with the increase of the excavation depth and reaches the minimum value of 2.8 mm after the excavation of the fifth layer of soil; if the initial displacement of the tunnel (5 mm) is not considered, the increased value of the negative deformation in the tunnel horizontal direction caused by the construction is 2.2 mm. After adopting the present invention, the lateral displacement of the retaining structure increases less significantly with the increase of the excavation depth, and the maximum value of the lateral displacement after the excavation of the fifth layer of soil is significantly smaller than the lateral deformation without installing the actuator 40. Moreover, with the increase of the excavation depth, the position of the maximum value of the lateral displacement of the retaining structure does not move down significantly. Thus, it can be seen that by applying the axial force compensation force of the present invention, the deformation of the retaining structure is effectively controlled.

[0057] In summary, the active control system and method for the environmental impact of large-area underground engineering construction provided by the present invention. This system includes an active control platform system 10, a PLC controller 20, an axial force monitoring device, an actuator 40, a retaining structure monitoring device 50, and an environmental monitoring device 60. There are several support structures 41 in the underground engineering construction area 01. The actuator 40 is installed at the end of the support structure 41 and is used to adjust the support axial force. The axial force monitoring device monitors the real-time support axial force value of the support structure 41 in real time. The retaining structure monitoring device 50 and the environmental monitoring device 60 monitor the deformation of the retaining structure and the environmental safety situation in real time. The active control platform system 10 controls the actuator 40 to act based on a preset warning value of the actuator, as well as the monitored real-time support axial force value, the deformation of the retaining structure, and the environmental safety situation, and actively applies an axial force compensation force, so as to effectively control the deformation of the retaining structure and achieve high-precision control of the environmental impact of large-area underground engineering construction. The present invention also expands the application scope of the active control method, and its application in the large-area underground engineering construction environment is no longer limited by the shape of the construction area.

[0058] Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. An active control system for the environmental impact of large-area underground engineering construction, characterized in that, It includes an active control platform system, a PLC controller, an axial force monitoring device, an actuator, a retaining structure monitoring device, and an environmental monitoring device. Several support structures are provided in the underground engineering construction area. The actuator is installed at the end of the support structure and is used to adjust the support axial force. The axial force monitoring device monitors the real-time support axial force value of the support structure in real time. The retaining structure monitoring device and the environmental monitoring device monitor the deformation of the retaining structure and the environmental safety situation in real time. Based on the preset warning value of the actuator, and the monitored real-time support axial force value, the deformation of the retaining structure, and the environmental safety situation, the active control platform system controls the actuator to act through the PLC controller.

2. The active control system for the environmental impact of large-area underground engineering construction according to claim 1, characterized in that The axial force monitoring device at least includes a displacement sensor and a pressure sensor.

3. The active control system for the environmental impact of large-area underground engineering construction according to claim 1, characterized in that, The PLC controller controls the extension, retraction, and commutation of multiple actuators, as well as the adjustment of the axial force increase and decrease, by controlling the solenoid valve, proportional overflow valve, and pressure regulating valve on the actuator.

4. An active control method for the environmental impact of large-area underground engineering construction, characterized in that, It includes the following steps: Step 1: Set several support structures according to the shape and surrounding environment of the underground engineering construction area, and install an actuator for adjusting the support axial force on the support structure. Step 2: Preset the warning value of the actuator according to the basic situation of the underground project and the surrounding environment. Step 3: Use the axial force monitoring device to monitor the real-time support axial force value, the retaining structure monitoring device to monitor the deformation of the retaining structure, and the environmental monitoring device to monitor the environmental safety situation. Step 4: Control the actuator to act based on Step 2 and Step 3 to actively control the surrounding environment.

5. The active control method for the environmental impact of large-area underground engineering construction according to claim 4, wherein, In Step 1, the support structure is set based on the aspect ratio of the underground engineering construction area.

6. The active control method for the environmental impact of large-area underground engineering construction according to claim 5, characterized in that, When the aspect ratio of the underground engineering construction area is greater than the threshold value, the support structure supports in the width direction. When the aspect ratio of the underground engineering construction area is less than the threshold value, it is processed in sections, and the support structure and the actuator are set on the side with high control over environmental impact.

7. The active control method for the environmental impact of large-area underground engineering construction according to claim 4, characterized in that In Step 2, according to the basic situation of the underground project and the surrounding environment, combined with the finite element calculation method, calculate the deformation control value of the retaining structure, and adjust and control the warning value of the actuator based on the deformation control value of the retaining structure.

8. The active control method for the environmental impact of large-area underground engineering construction according to claim 7, wherein Step 2 also includes presetting the control value range of each actuator according to the basic situation of the underground project and the surrounding environment.

9. The active control method for the environmental impact of large-area underground engineering construction according to claim 8, characterized in that, F X The control value range set for the Xth actuator, F XT is the recommended warning value of the Xth actuator. F2 is 1060 - 2625 kN, and F 2T is 1900 kN; F3 is 1100 - 2625 kN, and F 3T is 1900 kN; F4 is 1170 - 5000 kN, and F 4T is 2330 kN; F5 is 1100 - 2700 kN, and F 5T is 1970 kN; F6 is 1100 - 10000 kN, and F 6T is 4690 kN; F7 is 1400 - 4000 kN, and F 7T is 3200 kN; F8 is 3600 - 4000 kN, and F 8T is 3730 kN.

10. The active control method for the environmental impact of large-area underground engineering construction according to claim 4, characterized in that, The loading method of the actuator includes: for wide-range loading: take half of the warning value of the actuator, round up, and use 200 kN as the loading value each time, and load step by step to the set value; for narrow-range loading: load at a speed of 10 kN / hour until the deformation situation meets the requirements.

Images