Prefabricated foundation pit support monitoring and early warning method and system for soft soil areas

Abstract

The invention discloses a monitoring and early warning method and system for prefabricated foundation pit support for soft soil areas, and relates to the technical field of monitoring and early warning methods and systems, including an environment collection module, a stress collection module, a construction planning module, a dynamic monitoring module, and a trend prediction module. By establishing environmental impact values ​​and construction impact value monitoring for prefabricated foundation pit support, drainage measures are added in a timely and targeted manner to lower the groundwater level, and waterproof measures around the foundation pit are strengthened. At the same time, close attention is paid to rainfall. When the rainfall continues to be too large, personnel and equipment are evacuated in advance, and the construction plan is adjusted to avoid key operations in high temperature or high humidity environments. On the basis of the environmental impact value and the construction impact value, a comprehensive impact value is established to dynamically monitor the stability of the prefabricated foundation pit support, and according to the construction planning process, an environmental impact value m, a construction impact value n, and a comprehensive impact value S data table are established to predict and warn the support structure.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring and early warning methods and systems, and in particular to a monitoring and early warning method and system for assembled foundation pit support used in soft soil areas. Background Art

[0002] At present, foundation pit monitoring technology has been widely used and is constantly being innovated and improved. However, most of these technologies are aimed at foundation pit projects under general geological conditions, and the particularity of soft soil areas is not sufficiently considered. Traditional monitoring methods, such as manual observation and measuring instruments, are reliable, but they are cumbersome, time-consuming and labor-intensive to operate, and are restricted by human factors and environmental conditions. Modern monitoring technologies, such as laser rangefinders, GPS positioning technology, and remote sensing technology, have improved the efficiency and accuracy of monitoring, but their application in soft soil areas still has certain limitations.

[0003] In soft soil areas, the deformation and stability of foundation pit support structures are the focus of monitoring. Due to the slow settlement and deformation of soft soil, existing technologies are unable to capture tiny deformation signals in a timely manner. In addition, changes in groundwater levels, increases and decreases in rainfall, earthquakes and other natural disasters will affect the stability of foundation pit support structures. The changes in these environmental factors are sudden and uncertain, making it difficult for existing technologies to accurately and real-time monitor and warn of support structures. Summary of the invention

[0004] In view of the above situation, the present invention dynamically monitors the stability of the prefabricated foundation pit support by calculating the environmental impact value, construction impact value, and comprehensive impact value of the prefabricated foundation pit support, and establishes a data table of environmental impact value m, construction impact value n, and comprehensive impact value S according to the construction planning process to predict and warn the support structure.

[0005] The technical solution is as follows: S1, collecting the groundwater level A, rainfall B, earthquake warning signal C, ambient temperature D, and soil humidity E of the prefabricated foundation pit support, and at the same time collecting the construction load F and soil stress H of the prefabricated foundation pit support;

[0006] S2, extract the underground warning water level A1, warning rainfall B1, environmental warning temperature D1, and land warning humidity E1, and calculate the underground water level difference ratio A2=(A1-A) / A1, rainfall difference ratio B2=(B1-B) / B1, environmental temperature difference ratio D2=(D1-D) / D1, and land humidity difference ratio E2=(E1-E) / E1;

[0007] S3, calculate the environmental impact value m, m=A2×0.4+B2×0.4+D2×0.2+E2×0.2+ξ, where ξ represents the error correction value of the environmental impact value. When A2 is negative, it means that the groundwater level exceeds the warning value, and A2 is 1 in the calculation of the environmental impact value m. When B2 is negative, it means that the rainfall exceeds the warning value, and B2 is 1 in the calculation of the environmental impact value m. When D2 is negative, it means that the ambient temperature exceeds the warning value, and D2 is 1 in the calculation of the environmental impact value m. When E2 is negative, it means that the land humidity exceeds the warning value, and E2 is 1 in the calculation of the environmental impact value m.

[0008] S4, extract the construction threshold load F1 and the soil threshold stress H1, calculate the construction load difference ratio F2 = (F1-F) / F1, and the soil stress difference ratio H2 = (H1-H) / H1;

[0009] Calculate the construction impact value n, n=F2×0.6+H2×0.4, where a negative value of F2 indicates overload and a negative value of H2 indicates overstress;

[0010] When there is no overload and no overstress, both F2 and H2 are positive, and we proceed to the next step;

[0011] S5, calculate the comprehensive impact value Q, Q = ρ × (m + n), where ρ is the comprehensive impact value coefficient;

[0012] Extract the construction progress of the prefabricated foundation pit support, and retrieve the corresponding comprehensive impact value threshold Q1 according to the construction progress. When Q is less than Q1, it indicates that the prefabricated foundation pit support is safe, and proceed to the next step;

[0013] S6, extract the construction plan of prefabricated foundation pit support, and establish the data table of environmental impact value m, construction impact value n, and comprehensive impact value S according to the construction planning process. When abnormal construction impact value n and comprehensive impact value Q appear continuously, readjust the construction plan to improve the safety level of prefabricated foundation pit support construction.

[0014] Furthermore, in step S4, when overload and / or overstress occurs, it indicates that the foundation pit support faces structural safety risks, and relevant personnel immediately take emergency measures to reduce the load or take reinforcement measures to enhance the stability of the foundation pit support. According to the prefabricated foundation pit support after load reduction or reinforcement measures, the new construction threshold load, soil threshold stress, underground warning water level, warning rainfall, environmental warning temperature, and land warning humidity are re-matched, and steps S1-S4 are repeated until both F2 and H2 are positive.

[0015] Furthermore, in step S5, when Q is greater than or equal to Q1, it indicates that the safety of the prefabricated foundation pit support is abnormal, and A2, B2, D2, and E2 whose values ​​are 1 in the environmental impact value m formula are extracted. When A2 is 1, drainage measures are added to lower the groundwater level. When B2 is 1, waterproof measures around the foundation pit are strengthened. At the same time, close attention is paid to rainfall. When the rainfall continues to be too large, personnel and equipment are evacuated in advance. When D2 or E2 is 1, the construction plan is adjusted to avoid performing critical operations in high temperature or high humidity environments. Steps S1-S5 are repeated until Q is less than Q1.

[0016] Furthermore, once the earthquake warning signal C is received, construction is immediately stopped, personnel and equipment are evacuated, and after the earthquake signal disappears, steps S1-S6 are repeated to re-evaluate the safety of the prefabricated foundation pit support, and the subsequent construction plan is adjusted according to the evaluation results.

[0017] Furthermore, once the construction process of the prefabricated foundation pit support is adjusted, it is necessary to re-collect data and repeat steps S1-S6 to evaluate the safety of the prefabricated foundation pit support and adjust the subsequent construction plan according to the evaluation results.

[0018] Furthermore, the system is applied to the monitoring and early warning method of prefabricated foundation pit support in soft soil areas, including an environment collection module, a stress collection module, a construction planning module, a dynamic monitoring module, and a trend prediction module. The environment collection module collects the groundwater level A, rainfall B, earthquake early warning signal C, environmental temperature D, and soil humidity E of the prefabricated foundation pit support;

[0019] The stress collection module collects the construction load F and soil stress H of the prefabricated foundation pit support;

[0020] The construction planning module collects the construction progress of the prefabricated foundation pit support and stores the construction plan of the prefabricated foundation pit support;

[0021] The dynamic monitoring module comprehensively monitors the data collected by the environment collection module, the stress collection module, and the construction planning module to dynamically monitor the safety of the prefabricated foundation pit support;

[0022] The trend prediction module establishes data tables of environmental impact value m, construction impact value n, and comprehensive impact value S. When abnormalities in construction impact value n and comprehensive impact value Q appear continuously, the construction plan is readjusted to improve the safety level of prefabricated foundation pit support construction.

[0023] Due to the adoption of the above technical solution, the present invention has the following advantages compared with the prior art:

[0024] 1. By establishing environmental impact values ​​and construction impact value monitoring for prefabricated foundation pit support, timely and targeted drainage measures are added to lower the groundwater level, and waterproof measures around the foundation pit are strengthened. At the same time, close attention is paid to rainfall. When the rainfall continues to be too heavy, personnel and equipment are evacuated in advance, and the construction plan is adjusted to avoid critical operations in high temperature or high humidity environments. When overload and / or overstress occur, it indicates that the foundation pit support faces structural safety risks. Emergency measures should be taken immediately by relevant personnel to reduce the load or take reinforcement measures to enhance the stability of the foundation pit support.

[0025] 2. On the basis of environmental impact value and construction impact value, a comprehensive impact value is established to dynamically monitor the stability of prefabricated foundation pit support, and according to the construction planning process, a data table of environmental impact value m, construction impact value n, and comprehensive impact value S is established to predict and warn the support structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a method flow chart of the prefabricated foundation pit support monitoring and early warning method and system used in soft soil areas.

[0027] Figure 2 The present invention is a system flow chart of the prefabricated foundation pit support monitoring and early warning method and system used in soft soil areas. DETAILED DESCRIPTION

[0028] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figure 1 to Figure 2 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0029] Due to the slow settlement and deformation of soft soil, existing technologies are unable to capture tiny deformation signals in a timely manner. In addition, changes in groundwater levels, increases and decreases in rainfall, earthquakes and other natural disasters will affect the stability of the foundation pit support structure. The changes in these environmental factors are sudden and uncertain, so it is necessary to establish a complete monitoring data system. At the same time, by observing the data changes of the monitoring system, the safety of the prefabricated foundation pit support can be predicted in a timely manner.

[0030] S1, collects the groundwater level A, rainfall B, earthquake warning signal C, ambient temperature D, soil humidity E of the prefabricated foundation pit support, and also collects the construction load F and soil stress H of the prefabricated foundation pit support;

[0031] S2, extract the underground warning water level A1, warning rainfall B1, environmental warning temperature D1, and land warning humidity E1, and calculate the underground water level difference ratio A2=(A1-A) / A1, rainfall difference ratio B2=(B1-B) / B1, environmental temperature difference ratio D2=(D1-D) / D1, and land humidity difference ratio E2=(E1-E) / E1;

[0032] S3, calculate the environmental impact value m, m=A2×0.4+B2×0.4+D2×0.2+E2×0.2+ξ, where ξ represents the error correction value of the environmental impact value. When A2 is negative, it means that the groundwater level exceeds the warning value, and A2 is 1 in the calculation of the environmental impact value m. When B2 is negative, it means that the rainfall exceeds the warning value, and B2 is 1 in the calculation of the environmental impact value m. When D2 is negative, it means that the ambient temperature exceeds the warning value, and D2 is 1 in the calculation of the environmental impact value m. When E2 is negative, it means that the land humidity exceeds the warning value, and E2 is 1 in the calculation of the environmental impact value m.

[0033] S4, extract the construction threshold load F1 and the soil threshold stress H1, calculate the construction load difference ratio F2 = (F1-F) / F1, and the soil stress difference ratio H2 = (H1-H) / H1;

[0034] Calculate the construction impact value n, n=F2×0.6+H2×0.4, where a negative value of F2 indicates overload and a negative value of H2 indicates overstress;

[0035] When there is no overload and no overstress, both F2 and H2 are positive, and we proceed to the next step;

[0036] S5, calculate the comprehensive impact value Q, Q = ρ × (m + n), where ρ is the comprehensive impact value coefficient;

[0037] Extract the construction progress of the prefabricated foundation pit support, and retrieve the corresponding comprehensive impact value threshold Q1 according to the construction progress. When Q is less than Q1, it indicates that the prefabricated foundation pit support is safe, and proceed to the next step;

[0038] S6, extract the construction plan of prefabricated foundation pit support, and establish the data table of environmental impact value m, construction impact value n, and comprehensive impact value S according to the construction planning process. When abnormal construction impact value n and comprehensive impact value Q appear continuously, readjust the construction plan to improve the safety level of prefabricated foundation pit support construction.

[0039] Furthermore, in step S4, when overload and / or overstress occurs, it indicates that the foundation pit support faces structural safety risks, and relevant personnel immediately take emergency measures to reduce the load or take reinforcement measures to enhance the stability of the foundation pit support. According to the prefabricated foundation pit support after load reduction or reinforcement measures, the new construction threshold load, soil threshold stress, underground warning water level, warning rainfall, environmental warning temperature, and land warning humidity are re-matched, and steps S1-S4 are repeated until both F2 and H2 are positive.

[0040] Furthermore, in step S5, when Q is greater than or equal to Q1, it indicates that the safety of the prefabricated foundation pit support is abnormal, and A2, B2, D2, and E2 whose values ​​are 1 in the environmental impact value m formula are extracted. When A2 is 1, drainage measures are added to lower the groundwater level. When B2 is 1, waterproof measures around the foundation pit are strengthened. At the same time, close attention is paid to rainfall. When the rainfall continues to be too large, personnel and equipment are evacuated in advance. When D2 or E2 is 1, the construction plan is adjusted to avoid performing critical operations in high temperature or high humidity environments. Steps S1-S5 are repeated until Q is less than Q1.

[0041] Furthermore, once the earthquake warning signal C is received, construction is immediately stopped, personnel and equipment are evacuated, and after the earthquake signal disappears, steps S1-S6 are repeated to re-evaluate the safety of the prefabricated foundation pit support, and the subsequent construction plan is adjusted according to the evaluation results.

[0042] Furthermore, once the construction process of the prefabricated foundation pit support is adjusted, it is necessary to re-collect data and repeat steps S1-S6 to evaluate the safety of the prefabricated foundation pit support and adjust the subsequent construction plan according to the evaluation results.

[0043] Furthermore, the system is applied to the monitoring and early warning method of prefabricated foundation pit support in soft soil areas, including an environment collection module, a stress collection module, a construction planning module, a dynamic monitoring module, and a trend prediction module. The environment collection module collects the groundwater level A, rainfall B, earthquake early warning signal C, environmental temperature D, and soil humidity E of the prefabricated foundation pit support;

[0044] The stress collection module collects the construction load F and soil stress H of the prefabricated foundation pit support;

[0045] The construction planning module collects the construction progress of the prefabricated foundation pit support and stores the construction plan of the prefabricated foundation pit support;

[0046] The dynamic monitoring module comprehensively monitors the data collected by the environment collection module, the stress collection module, and the construction planning module to dynamically monitor the safety of the prefabricated foundation pit support;

[0047] The trend prediction module establishes data tables of environmental impact value m, construction impact value n, and comprehensive impact value S. When abnormalities in construction impact value n and comprehensive impact value Q appear continuously, the construction plan is readjusted to improve the safety level of prefabricated foundation pit support construction.

[0048] When the present invention is used specifically, on the basis of the existing technology, the groundwater level A, rainfall B, earthquake warning signal C, ambient temperature D, and soil humidity E of the prefabricated foundation pit support are collected, and at the same time, the construction load F and soil stress H of the prefabricated foundation pit support are collected;

[0049] Extract the underground warning water level A1, warning rainfall B1, environmental warning temperature D1, and land warning humidity E1, and calculate the groundwater level difference ratio A2=(A1-A) / A1, rainfall difference ratio B2=(B1-B) / B1, environmental temperature difference ratio D2=(D1-D) / D1, and land humidity difference ratio E2=(E1-E) / E1;

[0050] Calculate the environmental impact value m, m=A2×0.4+B2×0.4+D2×0.2+E2×0.2+ξ, where ξ represents the error correction value of the environmental impact value. When A2 is negative, it means that the groundwater level exceeds the warning value, and A2 is 1 in the calculated environmental impact value m. When B2 is negative, it means that the rainfall exceeds the warning value, and B2 is 1 in the calculated environmental impact value m. When D2 is negative, it means that the ambient temperature exceeds the warning value, and D2 is 1 in the calculated environmental impact value m. When E2 is negative, it means that the land humidity exceeds the warning value, and E2 is 1 in the calculated environmental impact value m.

[0051] Extract the construction threshold load F1 and soil threshold stress H1, calculate the construction load difference ratio F2 = (F1-F) / F1, and the soil stress difference ratio H2 = (H1-H) / H1;

[0052] Calculate the construction impact value n, n=F2×0.6+H2×0.4, where a negative value of F2 indicates overload and a negative value of H2 indicates overstress;

[0053] When there is no overload and no overstress, both F2 and H2 are positive, and we proceed to the next step;

[0054] Calculate the comprehensive impact value Q, Q=ρ×(m+n), where ρ is the comprehensive impact value coefficient;

[0055] Extract the construction progress of the prefabricated foundation pit support, and retrieve the corresponding comprehensive impact value threshold Q1 according to the construction progress. When Q is less than Q1, it indicates that the prefabricated foundation pit support is safe, and proceed to the next step;

[0056] Extract the construction plan of prefabricated foundation pit support, establish the data table of environmental impact value m, construction impact value n, and comprehensive impact value S according to the construction planning process, and readjust the construction plan when the construction impact value n and comprehensive impact value Q are abnormal continuously, so as to improve the safety level of prefabricated foundation pit support construction. By calculating the environmental impact value, construction impact value, and comprehensive impact value of prefabricated foundation pit support, the stability of prefabricated foundation pit support is dynamically monitored, and the data table of environmental impact value m, construction impact value n, and comprehensive impact value S is established according to the construction planning process to predict and warn the support structure.

[0057] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical field to which the present invention belongs and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. A prefabricated foundation pit support monitoring and early warning method for soft soil areas, characterized in that: The method is specifically as follows: S1, collecting the groundwater level A, rainfall B, earthquake warning signal C, ambient temperature D, and soil humidity E of the prefabricated foundation pit support, and at the same time collecting the construction load F and soil stress H of the prefabricated foundation pit support; S2, extract the underground warning water level A1, warning rainfall B1, environmental warning temperature D1, and land warning humidity E1, and calculate the underground water level difference ratio A2=(A1-A) / A1, rainfall difference ratio B2=(B1-B) / B1, environmental temperature difference ratio D2=(D1-D) / D1, and land humidity difference ratio E2=(E1-E) / E1; S3, calculate the environmental impact value m, m=A2×0.4+B2×0.4+D2×0.2+E2×0.2+ξ, where ξ represents the error correction value of the environmental impact value. When A2 is negative, it means that the groundwater level exceeds the warning value, and A2 is 1 in the calculation of the environmental impact value m. When B2 is negative, it means that the rainfall exceeds the warning value, and B2 is 1 in the calculation of the environmental impact value m. When D2 is negative, it means that the ambient temperature exceeds the warning value, and D2 is 1 in the calculation of the environmental impact value m. When E2 is negative, it means that the land humidity exceeds the warning value, and E2 is 1 in the calculation of the environmental impact value m. S4, extract the construction threshold load F1 and the soil threshold stress H1, calculate the construction load difference ratio F2 = (F1-F) / F1, and the soil stress difference ratio H2 = (H1-H) / H1; Calculate the construction impact value n, n=F2×0.6+H2×0.4, where a negative value of F2 indicates overload and a negative value of H2 indicates overstress; When there is no overload and no overstress, both F2 and H2 are positive, and we proceed to the next step; S5, calculate the comprehensive impact value Q, Q = ρ × (m + n), where ρ is the comprehensive impact value coefficient; Extract the construction progress of the prefabricated foundation pit support, and retrieve the corresponding comprehensive impact value threshold Q1 according to the construction progress. When Q is less than Q1, it indicates that the prefabricated foundation pit support is safe, and proceed to the next step; S6, extract the construction plan of prefabricated foundation pit support, and establish the data table of environmental impact value m, construction impact value n, and comprehensive impact value S according to the construction planning process. When abnormal construction impact value n and comprehensive impact value Q appear continuously, readjust the construction plan to improve the safety level of prefabricated foundation pit support construction.

2. The prefabricated foundation pit support monitoring and early warning method for soft soil areas as claimed in claim 1, characterized in that: In step S4, when overload and / or overstress occur, it indicates that the foundation pit support faces structural safety risks, and relevant personnel immediately take emergency measures to reduce the load or take reinforcement measures to enhance the stability of the foundation pit support. According to the prefabricated foundation pit support after load reduction or reinforcement measures, the new construction threshold load, soil threshold stress, underground warning water level, warning rainfall, environmental warning temperature, and land warning humidity are re-matched, and steps S1-S4 are repeated until F2 and H2 are both positive.

3. The prefabricated foundation pit support monitoring and early warning method for soft soil areas as claimed in claim 1, characterized in that: In step S5, when Q is greater than or equal to Q1, it indicates that the safety of the prefabricated foundation pit support is abnormal. A2, B2, D2, and E2 whose values ​​are 1 in the environmental impact value m formula are extracted. When A2 is 1, drainage measures are added to lower the groundwater level. When B2 is 1, waterproof measures around the foundation pit are strengthened. At the same time, close attention is paid to rainfall. When the rainfall continues to be too heavy, personnel and equipment are evacuated in advance. When D2 or E2 is 1, the construction plan is adjusted to avoid performing critical operations in high temperature or high humidity environments. Repeat steps S1-S5 until Q is less than Q1.

4. The prefabricated foundation pit support monitoring and early warning method for soft soil areas as claimed in claim 1, characterized in that: Once the earthquake warning signal C is received, construction is stopped immediately, personnel and equipment are evacuated, and after the earthquake signal disappears, steps S1-S6 are repeated to re-evaluate the safety of the prefabricated foundation pit support, and the subsequent construction plan is adjusted according to the evaluation results.

5. The prefabricated foundation pit support monitoring and early warning method for soft soil areas according to any one of claims 1 to 4, characterized in that: Once the construction process of the prefabricated foundation pit support is adjusted, it is necessary to re-collect data and repeat steps S1-S6 to evaluate the safety of the prefabricated foundation pit support and adjust the subsequent construction plan based on the evaluation results.

6. The prefabricated foundation pit support monitoring and early warning system for soft soil areas is characterized by: The system is applied to the monitoring and early warning method for prefabricated foundation pit support in soft soil areas as claimed in any one of claims 1 to 4, including an environment collection module, a stress collection module, a construction planning module, a dynamic monitoring module, and a trend prediction module. The environment collection module collects the groundwater level A, rainfall B, earthquake early warning signal C, ambient temperature D, and soil humidity E of the prefabricated foundation pit support; The stress collection module collects the construction load F and soil stress H of the prefabricated foundation pit support; The construction planning module collects the construction progress of the prefabricated foundation pit support and stores the construction plan of the prefabricated foundation pit support; The dynamic monitoring module comprehensively monitors the data collected by the environment collection module, the stress collection module, and the construction planning module to dynamically monitor the safety of the prefabricated foundation pit support; The trend prediction module establishes data tables of environmental impact value m, construction impact value n, and comprehensive impact value S. When abnormalities in construction impact value n and comprehensive impact value Q appear continuously, the construction plan is readjusted to improve the safety level of prefabricated foundation pit support construction.

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