Foundation pit dewatering anti-heave calculation method and system

Abstract

The application discloses a kind of foundation pit drop drainage anti-surge calculation method and system, it is related to foundation pit engineering technical field.The following steps are included: obtaining the address parameter of the region where foundation pit is located, hydrological parameter and foundation pit design parameter, the geological parameter includes soil thickness, the specific gravity of soil, the hydrological parameter includes confined water head height, the foundation pit design parameter includes foundation pit excavation depth;The total dead weight pressure of soil above the foundation pit bottom plate is calculated based on the geological parameter.The application collects the geological parameter of the region where foundation pit is located, hydrological parameter and foundation pit design parameter by data acquisition module, and each type of sensor group ensures the reliability of data, data transmission unit timely transmits data to data processing module, and data processing module calculates the total dead weight pressure of soil above the foundation pit bottom plate and the pressure of confined water on the foundation pit bottom plate by first calculating unit and second calculating unit respectively, to ensure the accuracy and efficiency of pressure calculation.

Description

Technical Field

[0001] This invention relates to the field of foundation pit engineering technology, specifically to a calculation method and system for foundation pit dewatering and anti-surge calculation. Background Technology

[0002] In the field of foundation pit engineering, dewatering is one of the important measures to ensure the stability of foundation pits and the safety of construction. Especially in sites with weak bottom layers or confined water, the prevention of foundation pit surge is particularly important. Foundation pit surge refers to the situation where confined water in the foundation pit seeps out to the bottom of the foundation pit under certain pressure through seepage, causing the soil around the foundation pit to lose stability, or even cause displacement or collapse. Such incidents can not only damage the buildings or structures around the foundation pit, but also pose a serious threat to construction workers and the surrounding environment. Therefore, accurate dewatering design and calculation for foundation pits are essential.

[0003] Traditional methods for calculating foundation pit dewatering are mostly based on empirical formulas or simplified models. This approach has certain inaccuracies when assessing foundation pit stability, especially when facing complex geological conditions and sites with high confined water levels. Its accuracy and reliability are seriously challenged. Existing calculation methods often fail to fully consider the impact of geological and hydrological parameters on foundation pit stability and lack systematic calculation processes and standards. This not only increases the complexity of design work but also makes it difficult to predict the possibility of foundation pit inrush and to take effective preventive and control measures in advance. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for calculating the anti-surge indentation of foundation pit dewatering, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for calculating the anti-surge indentation of foundation pit dewatering, comprising the following steps: Obtain the geological parameters, hydrological parameters, and design parameters of the area where the foundation pit is located. The geological parameters include soil layer thickness and soil unit weight. The hydrological parameters include the height of the confined water head. The foundation pit design parameters include the excavation depth of the foundation pit. Calculate the total self-weight pressure of the soil above the foundation pit bottom slab based on the geological parameters, and calculate the pressure of confined water on the foundation pit bottom slab based on the hydrological parameters. The total self-weight pressure of the soil above the foundation pit bottom slab is compared with the pressure of the confined water on the foundation pit bottom slab. If the total self-weight pressure of the soil above the foundation pit floor is greater than the pressure of the confined water on the foundation pit floor, it is determined that the foundation pit will not experience a sudden surge. If the total self-weight pressure of the soil above the foundation pit floor is less than or equal to the pressure of the confined water on the foundation pit floor, it is determined that the foundation pit may experience a sudden surge, and the required reduction in the confined water head height is calculated.

[0006] Preferably, the formula for calculating the total self-weight pressure of the soil above the foundation pit bottom slab based on the geological parameters is as follows: ,in, This refers to the total self-weight pressure of the soil above the foundation pit floor. Let be the unit weight of the i-th soil layer. Let be the thickness of the i-th soil layer.

[0007] Preferably, the formula for calculating the pressure of confined water on the foundation pit bottom slab based on the hydrological parameters is as follows: ,in, The pressure of the confined water on the bottom slab of the foundation pit. The density of water, It is the difference between the height of the confined water head and the burial depth of the foundation pit bottom slab.

[0008] Preferably, the formula for calculating the required reduction in the confined water head is: ,in, For the need to reduce the height of the confined water head, The safety head height is defined as 0.5-1.0m.

[0009] A calculation system for dewatering and heave prevention in foundation pits includes: The data acquisition module is used to collect geological parameters, hydrological parameters, and foundation pit design parameters of the area where the foundation pit is located. The geological parameters include soil layer thickness and soil unit weight. The hydrological parameters include confined water head height. The foundation pit design parameters include foundation pit excavation depth. The data processing module is used to calculate the total self-weight pressure of the soil above the foundation pit bottom slab based on the geological parameters, and to calculate the pressure of confined water on the foundation pit bottom slab based on the hydrological parameters. The judgment module is used to compare the total self-weight pressure of the soil above the foundation pit bottom slab with the pressure of the pressurized water on the foundation pit bottom slab; The results output module is used to determine whether a sudden surge has occurred in the foundation pit based on the comparison results. If a sudden surge is possible, it calculates and outputs the required reduction in the confined water head height.

[0010] Preferably, the data acquisition module includes a sensor group and a data transmission unit. The sensor group is used to collect geological parameters and hydrological parameters, and the data transmission unit is used to transmit the collected data to the data processing module.

[0011] Preferably, the data processing module includes a first calculation unit and a second calculation unit. The first calculation unit is used to calculate the total self-weight pressure of the soil above the foundation pit bottom slab based on the geological parameters, and the second calculation unit is used to calculate the pressure of confined water on the foundation pit bottom slab based on the hydrological parameters.

[0012] Preferably, the first calculation unit uses the formula Calculate the total self-weight pressure of the soil above the foundation pit bottom slab, where... This refers to the total self-weight pressure of the soil above the foundation pit floor. Let be the unit weight of the i-th soil layer. Let be the thickness of the i-th soil layer; The second calculation unit is used to calculate the potential for a sudden surge in the foundation pit using the formula... Safety calculations require a reduction in the height of the confined water head, among which, For the need to reduce the height of the confined water head, The safety head height is defined as 0.5-1.0m.

[0013] Preferably, the system further includes a storage module for storing the data acquired by the data acquisition module, the calculation results of the data processing module, and the judgment results of the judgment module. The system also includes a display module, which is used to display the results output by the result output module.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The method and system for calculating drainage and anti-surge indentation in foundation pits uses a data acquisition module to collect geological parameters, hydrological parameters, and foundation pit design parameters of the area where the foundation pit is located. Various sensor groups ensure the reliability of the data. The data transmission unit transmits the data to the data processing module in a timely manner. The data processing module calculates the total self-weight pressure of the soil above the foundation pit bottom slab and the pressure of the confined water on the foundation pit bottom slab through the first calculation unit and the second calculation unit, respectively, to ensure the accuracy and efficiency of the pressure calculation.

[0015] Meanwhile, based on the pressure comparison results of the two, the judgment module can accurately determine whether a sudden surge will occur in the foundation pit, and calculate the height of the pressurized water head that needs to be reduced when a sudden surge may occur. The result output module then feeds back these judgment and calculation results to the user, and displays them clearly through the display module, so that construction managers can understand the safety status of the foundation pit in real time and take timely dewatering measures to ensure construction safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the calculation method for foundation pit dewatering and anti-surge calculation according to the present invention; Figure 2 This is a schematic diagram of the calculation system for foundation pit dewatering and anti-surge calculation according to the present invention; Figure 3 This is a schematic diagram of the internal structure of the data processing module of the present invention; Figure 4 This is a flowchart of the internal process of the judgment module of the present invention; Figure 5 This is an internal flowchart of the data acquisition module of the present invention; Figure 6 This is an internal flowchart of the result output module of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "above," and "below" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0023] like Figures 1-6 As shown, the present invention provides a technical solution: a method for calculating the anti-surge indentation of foundation pit dewatering, comprising the following steps: Obtain the geological parameters, hydrological parameters, and design parameters of the area where the foundation pit is located. The geological parameters include the thickness of each coating layer. ), unit weight of each soil layer ( Hydrological parameters include the height of the confined water head (H), and the design parameters of the foundation pit include the excavation depth (D) and the burial depth of the foundation pit bottom slab (d). Then calculate the total self-weight pressure of the soil above the foundation pit bottom slab. The formula is: ,in, n is the number of soil layers, then calculate the pressure of the confined water on the bottom slab of the foundation pit ( First, calculate the difference between the height of the confined water head and the burial depth of the foundation pit bottom slab. Then use the formula ,in The specific gravity of water is preferably 10 kN / m³ in this application. 3 Then compare and Size; like The foundation pit will not experience sudden swell; like A sudden surge may occur in the foundation pit, and the required reduction in the confined water head height should be calculated. The formula is: The safety calculation requires a reduction in the pressurized water head height, which is discussed in this application. The preferred depth is 0.5-1.0m.

[0024] A foundation pit dewatering and anti-surge calculation system includes a data acquisition module, which consists of a sensor group and a data transmission unit. The sensor group includes a soil thickness sensor, a soil unit weight measuring instrument, and a confined water head height monitoring instrument, which respectively collect data such as soil thickness, soil unit weight, and confined water head height. The data transmission unit can use wireless transmission technology to transmit the collected data to the data processing module in real time, with a transmission rate of not less than 1Mbps, to ensure timely data processing. The data processing module includes a first computing unit and a second computing unit. The first computing unit receives address parameters and processes them according to... The formula calculates the total self-weight pressure of the soil above the foundation pit bottom slab. During the calculation, the input soil layer thickness and unit weight data are verified. If the data exceeds a reasonable range (e.g., the unit weight of the soil is less than 16 kN / m³), the calculation will be terminated. 3 or greater than 22KN / m 3 If the data is abnormal, a data anomaly warning will be issued. The second calculation unit receives the hydrological parameters and first calculates... Based on The formula calculates the pressure of confined water on the foundation pit bottom slab, and the data is also reasonably verified. The judgment module receives data from the data processing module. and The data is compared using a built-in comparison algorithm, with a comparison response time of no more than 0.1 seconds, quickly yielding the comparison results. The result output module, based on the structure of the judgment module, if... The output pit will not experience a sudden surge, if Start the third computing unit, according to The safety formula calculates and outputs the required reduction in the pressurized water head. The storage module uses a large-capacity hard drive to store the raw data collected by the data acquisition module, the calculation results of the data processing module, and the judgment structure of the judgment module. The data storage format is the common CSV format, which facilitates subsequent querying and analysis. The display module uses a high-definition LCD screen to display the results output by the result output module in real time, including... , Comparison results and The display refresh rate is no less than 30Hz to ensure that the displayed content is accurate in real time.

[0025] Example 1: Taking a foundation pit project as an example, the following data was collected by the sensor group of the data acquisition module: geological data: thickness of the first soil layer. Severe The thickness of the second soil layer Severe Hydrological parameters: confined water head height H=12m, foundation pit bottom slab burial depth d=8m, foundation pit design parameters: foundation pit excavation depth D=6m.

[0026] First calculation unit calculates : ; Second calculation unit calculates In calculation .

[0027] Module comparison and , and thus ; When the output module stops outputting, no sudden surge will occur in the foundation pit.

[0028] In another embodiment of this application, the data is obtained as follows: Geological parameters: thickness of the first soil layer Severe The thickness of the second soil layer Severe Hydrological parameters: confined water head height H=15m, foundation pit bottom slab burial depth d=7m.

[0029] Data processing: , , ; Judge the data: The output pit will not experience sudden surges.

[0030] In one embodiment of this application, the geological parameter is: the thickness of the first soil layer. Severe The thickness of the second soil layer Severe Hydrological parameters: confined water head height H=10m, foundation pit bottom slab burial depth d=5m.

[0031] Data processing: Ps = 16 × 1 + 17 × 2 = 16 + 34 = 50 kN / m 2 h_water = 10 - 5 = 5m, P_water = 10 × 5 = 50kN / m 2 ; Judgment data: Ps = 50 kN / m 2 =P_water = 50kN / m 2 ; Results obtained: Calculate Δh, take Δh safety = 0.5m, Δh = (50-50) / 10 + 0.5 = 0 + 0.5 = 0.5m, output "The foundation pit may experience a sudden surge, and the height of the confined water head needs to be reduced by 0.5m".

[0032] In this application, the algorithm calculation steps are as follows: The system receives geological parameters transmitted by the sensor array. , Hydrological parameters H and d, and foundation pit design parameters D, were converted into numerical data. The first calculation unit performs the following operations: sequentially reading the values ​​of each coating layer. and ,according to The calculation is performed using the cumulative formula, and intermediate results are stored after each accumulation is completed. Second calculation unit operation: First calculate Substitute Formula calculation, The default value is 10 kN / m 3 If there are special geological conditions, they can be modified through system settings; The judgment module operation: Substitute the values ​​of Psoil and Pwater into the comparison algorithm; if... Generate a safety signal if Generate early warning signals; The result output module performs the following operations: When a safety signal is received, the corresponding text result is directly output; when a warning signal is received, Δh calculation is initiated, first calculating... Adding Δh for safety, we get Δh and output it.

[0033] The above methods and systems enable rapid and accurate calculations for dewatering and surge protection in foundation pits, providing strong assurance for the safety of foundation pit construction.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A calculation method for dewatering and heave resistance in foundation pits, characterized in that, Includes the following steps: Obtain the geological parameters, hydrological parameters, and design parameters of the area where the foundation pit is located. The geological parameters include soil layer thickness and soil unit weight. The hydrological parameters include the height of the confined water head. The foundation pit design parameters include the excavation depth of the foundation pit. Calculate the total self-weight pressure of the soil above the foundation pit bottom slab based on the geological parameters, and calculate the pressure of confined water on the foundation pit bottom slab based on the hydrological parameters. The total self-weight pressure of the soil above the foundation pit bottom slab is compared with the pressure of the confined water on the foundation pit bottom slab. If the total self-weight pressure of the soil above the foundation pit floor is greater than the pressure of the confined water on the foundation pit floor, it is determined that the foundation pit will not experience a sudden surge. If the total self-weight pressure of the soil above the foundation pit floor is less than or equal to the pressure of the confined water on the foundation pit floor, it is determined that the foundation pit may experience a sudden surge, and the required reduction in the confined water head height is calculated.

2. The method for calculating the anti-surge inrush resistance of foundation pit dewatering according to claim 1, characterized in that: The formula for calculating the total self-weight pressure of the soil above the foundation pit bottom slab based on the aforementioned geological parameters is as follows: ,in, This refers to the total self-weight pressure of the soil above the foundation pit floor. Let be the unit weight of the i-th soil layer. Let be the thickness of the i-th soil layer.

3. The method for calculating the anti-surge inrush resistance of foundation pit dewatering according to claim 1, characterized in that: The formula for calculating the pressure of confined water on the foundation pit bottom slab based on the aforementioned hydrological parameters is as follows: ,in, The pressure of the confined water on the bottom slab of the foundation pit. The density of water, It is the difference between the height of the confined water head and the burial depth of the foundation pit bottom slab.

4. The method for calculating the anti-surge inrush resistance of foundation pit dewatering according to claim 1, characterized in that: The formula for calculating the required reduction in the confined water head is as follows: ,in, For the need to reduce the height of the confined water head, The safety head height is defined as 0.5-1.0m.

5. A calculation system for dewatering and heave prevention in foundation pits, characterized in that, include: The data acquisition module is used to collect geological parameters, hydrological parameters, and foundation pit design parameters of the area where the foundation pit is located. The geological parameters include soil layer thickness and soil unit weight. The hydrological parameters include confined water head height. The foundation pit design parameters include foundation pit excavation depth. The data processing module is used to calculate the total self-weight pressure of the soil above the foundation pit bottom slab based on the geological parameters, and to calculate the pressure of confined water on the foundation pit bottom slab based on the hydrological parameters. The judgment module is used to compare the total self-weight pressure of the soil above the foundation pit bottom slab with the pressure of the pressurized water on the foundation pit bottom slab; The results output module is used to determine whether a sudden surge has occurred in the foundation pit based on the comparison results. If a sudden surge is possible, it calculates and outputs the required reduction in the confined water head height.

6. The foundation pit dewatering and anti-surge calculation system according to claim 5, characterized in that: The data acquisition module includes a sensor group and a data transmission unit. The sensor group is used to collect geological parameters and hydrological parameters, and the data transmission unit is used to transmit the collected data to the data processing module.

7. The foundation pit dewatering and anti-surge calculation system according to claim 5, characterized in that: The data processing module includes a first calculation unit and a second calculation unit. The first calculation unit is used to calculate the total self-weight pressure of the soil above the foundation pit bottom slab based on the geological parameters, and the second calculation unit is used to calculate the pressure of confined water on the foundation pit bottom slab based on the hydrological parameters.

8. The foundation pit dewatering and anti-surge calculation system according to claim 7, characterized in that, The first calculation unit uses the formula Calculate the total self-weight pressure of the soil above the foundation pit bottom slab, where... This refers to the total self-weight pressure of the soil above the foundation pit floor. Let be the unit weight of the i-th soil layer. Let be the thickness of the i-th soil layer; The second calculation unit is used to calculate the potential for a sudden surge in the foundation pit using the formula... Safety calculations require a reduction in the height of the confined water head, among which, For the need to reduce the height of the confined water head, The safety head height is defined as 0.5-1.0m.

9. The foundation pit dewatering and anti-surge calculation system according to claim 5, characterized in that: The system also includes a storage module for storing the data acquired by the data acquisition module, the calculation results of the data processing module, and the judgment results of the judgment module. The system also includes a display module, which is used to display the results output by the result output module.

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