Displacement prediction system and method for steel cylinder soil retaining structure of soft soil foundation

Abstract

The invention discloses a soft soil foundation steel cylinder soil retaining structure displacement prediction system, which comprises a data acquisition module arranged around a steel cylinder soil retaining structure and used for monitoring construction data in real time; the data primary processing module is used for carrying out primary processing on the collected data; the data processing and analyzing module is used for performing data analysis and processing through an MSD method and calculating mobilization shear strength; the displacement prediction module is used for establishing a stress-strain relation model of the soil body according to the mobilization shear strength and predicting the displacement of the steel cylinder soil retaining structure; and the feedback adjustment module is used for providing construction adjustment suggestions according to the prediction result, dynamically adjusting construction parameters and optimizing the stress-strain relation model of the soil body. The invention further discloses a displacement prediction method for the steel cylinder soil retaining structure of the soft soil foundation. The displacement change of the retaining structure in the whole engineering period is accurately predicted, and the risk of structural instability is effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of land reclamation engineering, and in particular to a displacement prediction system and method for a steel cylinder retaining structure on a soft soil foundation. Background Art

[0002] Traditional foundation displacement prediction methods usually fail to fully consider the nonlinear stress-strain relationship of soft soil and its dynamic changes in actual engineering, resulting in deviations between the prediction results and the actual situation. Therefore, it is necessary to develop a system that can more accurately predict the displacement of steel cylinder retaining structures in soft soil foundations.

[0003] Soft soil foundations are widely found in coastal areas, lake sedimentary areas and other low-lying areas. The soil in these areas usually has high water content, low shear strength and high compressibility, which brings great challenges to engineering design and construction. When carrying out engineering construction on soft soil foundations, the settlement, lateral deformation and long-term stability of the soil must be considered.

[0004] Steel cylinder retaining structure is a common form of foundation pit support, usually used for deep foundation pit excavation and underground structure construction. Steel cylinder structure has the advantages of high strength, easy construction and adaptability to complex terrain, but when used in soft soil foundation, special attention should be paid to its interaction with the surrounding soil. Steel cylinder retaining structure is prone to lateral deformation and uneven settlement in soft soil foundation, affecting the safety and stability of the structure.

[0005] The MSD (mobilization strength design) method is a design method based on soil plasticity theory. It predicts the deformation behavior of foundations and structures by considering the mobilization shear strength of soil under stress. The method is based on the following key principles:

[0006] Effective stress principle: The shear strength of soil is mainly controlled by the effective stress. The MSD method determines the mobilization shear strength by calculating the effective stress of soil.

[0007] Mobilized shear strength: refers to the maximum shear strength that soil can mobilize under a specific stress state. Relevant parameters are obtained through laboratory tests (such as triaxial shear test, direct shear test) and field tests (such as static penetration test, standard penetration test).

[0008] Stress-strain relationship: The stress-strain relationship of soil reflects the deformation characteristics of soil during loading. The MSD method predicts the deformation of foundation and structure by establishing a reasonable stress-strain model.

[0009] In the steel cylinder retaining structure on soft soil foundation, the MSD method can be used in the following aspects:

[0010] Lateral deformation prediction: Through real-time monitoring and data processing, the lateral deformation of steel cylinder retaining structures during construction and operation can be predicted.

[0011] Settlement analysis: Combined with the mobilised shear strength and stress-strain relationship, the settlement and settlement rate of steel cylinder structures in soft soil foundations are evaluated.

[0012] Construction optimization: Based on the prediction results, optimize the construction process and support design to ensure the safety and stability of the structure.

[0013] Existing soft soil foundation displacement prediction methods usually rely on empirical formulas and simplified models, which fail to fully consider the nonlinear stress-strain relationship of the soil and its dynamic changes in actual engineering, resulting in a large deviation between the prediction results and the actual situation. In addition, traditional methods often ignore the interaction between the steel cylinder structure and the surrounding soil, and cannot accurately evaluate the lateral deformation and settlement of the structure. Summary of the invention

[0014] The purpose of the present invention is to overcome the existing defects and provide a displacement prediction system and method for a steel cylinder retaining structure on a soft soil foundation, which accurately predicts the displacement changes of the retaining structure during the entire engineering cycle and effectively prevents the risk of structural instability.

[0015] The technical solution to achieve the above purpose is:

[0016] A displacement prediction system for a steel cylinder retaining structure on a soft soil foundation according to the present invention comprises:

[0017] Data acquisition modules, deployed around the steel cylinder retaining structure, are used to monitor construction data in real time;

[0018] A data preliminary processing module is used to perform preliminary processing on the collected data;

[0019] Data processing and analysis module, used for data analysis and processing by improved MSD method, and calculation of mobilization shear strength;

[0020] The displacement prediction module is used to establish a stress-strain relationship model of the soil based on the mobilized shear strength and predict the displacement of the steel cylinder retaining structure;

[0021] The feedback adjustment module is used to provide construction adjustment suggestions based on the prediction results, dynamically adjust construction parameters and optimize the stress-strain relationship model of the soil.

[0022] Preferably, in the data acquisition module, construction data is collected in real time through sensors deployed around the steel cylinder retaining structure, wherein the construction data includes but is not limited to soil pressure, displacement and pore water pressure at the construction site.

[0023] Preferably, in the data preliminary processing module, preliminary processing includes filtering the collected data, removing noise and outliers, and performing standardization and normalization processing.

[0024] Preferably, in the data processing and analysis module, the formula for calculating the mobilization shear strength is:

[0025] c mob (m) = β (m) * c u ;

[0026] In the formula, c mob (m) is the average mobilization value of the undrained shear strength of the soft soil layer when the backfill behind the m-th step steel cylinder is loaded, β(m) is the average strength mobilization rate of the soft soil layer when the backfill behind the m-th step steel cylinder is loaded, c u is the average undrained shear strength of soft soil.

[0027] Preferably, in the displacement prediction module, the stress-strain relationship model of the soil is obtained through laboratory tests and field data, so as to obtain the average strength mobilization rate β of the soft soil layer at different construction stages. For normal consolidated clay, the following empirical formula can be used for calculation:

[0028]

[0029] γ mob (m) = 2δ θ (m);

[0030] In the formula, γ mob The average shear strain of the soft soil layer at step m, δ θ It is the rotation angle of the m-th step steel cylinder around a point on the lower part of the cylinder body, obtained through field measured data.

[0031] Preferably, in the displacement prediction module, a finite element analysis tool is used to perform numerical simulation, and the calculated mobilization shear strength c of the soft soil layer is used. mob (m) The undrained shear strength parameters in the finite element model are updated and the calculation results are used to predict the displacement of the steel cylinder retaining structure at different construction stages.

[0032] Preferably, the feedback adjustment module includes:

[0033] Real-time feedback unit, used to provide real-time feedback to the construction team based on the prediction results and provide construction adjustment suggestions;

[0034] The dynamic adjustment unit is used to dynamically adjust the construction parameters and optimize the stress-strain relationship model of the soil according to the real-time monitoring data and prediction results.

[0035] A second method for predicting displacement of a steel cylindrical retaining structure on a soft soil foundation includes:

[0036] Step S1, collecting construction data in real time through sensors deployed around the steel cylindrical retaining structure;

[0037] Step S2, filtering the collected data, removing noise and outliers, and performing standardization and normalization processing;

[0038] Step S3, analyzing and processing the preliminarily processed data by using the MSD method to calculate the mobilization shear strength;

[0039] Step S4, establishing a stress-strain relationship model of the soil according to the mobilization shear strength, and predicting the displacement of the steel cylindrical retaining structure;

[0040] Step S5: Provide real-time feedback to the construction team based on the prediction results and provide construction adjustment suggestions;

[0041] Step S6, dynamically adjusting construction parameters and optimizing the stress-strain relationship model of the soil according to the real-time monitoring data and prediction results.

[0042] Preferably, in step S1, the construction data includes but is not limited to soil pressure, displacement and pore water pressure at the construction site.

[0043] Preferably, in step S3, the formula for calculating the mobilization shear strength is:

[0044] c mob (m) = β (m) * c u ;

[0045] In the formula, c mob (m) is the average mobilization value of the undrained shear strength of the soft soil layer when the backfill is loaded behind the m-th step steel cylinder, β(m) is the average strength mobilization rate of the soft soil layer when the backfill is loaded behind the m-th step steel cylinder, which can be obtained through a suitable stress-strain curve, c u is the average undrained shear strength of soft soil.

[0046] The beneficial effects of the present invention are:

[0047] 1) The MSD method can more accurately evaluate the dynamic behavior of steel cylinder retaining structures in soft soil foundations and improve the accuracy of displacement prediction;

[0048] 2) Real-time prediction and feedback make engineering management more efficient and reduce potential safety accidents caused by displacement;

[0049] 3) Reduce over-construction and rework and save costs by precisely controlling displacement;

[0050] 4) Through real-time data collection, data processing and analysis, stress-strain relationship modeling and displacement prediction, the present invention can provide scientific decision-making support for engineers, optimize construction plans, and improve engineering safety and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a module diagram of a displacement prediction system for a steel cylinder retaining structure on a soft soil foundation according to the present invention;

[0052] Figure 2 It is a specific module diagram of the feedback adjustment module in the present invention;

[0053] Figure 3 The present invention is a flow chart of a method for predicting displacement of a steel cylinder retaining structure on a soft soil foundation.

[0054] Figure 4 It is a schematic diagram of the displacement of the steel cylinder in the present invention. DETAILED DESCRIPTION

[0055] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0056] The present invention will be further described below in conjunction with the accompanying drawings.

[0057] like Figure 1 As shown, a displacement prediction system for a steel cylindrical retaining structure on a soft soil foundation comprises: a data acquisition module 1, a data preliminary processing module 2, a data processing and analysis module 3, a displacement prediction module 4 and a feedback adjustment module 5.

[0058] The data acquisition module 1 is deployed around the steel cylinder retaining structure and is used to monitor the construction data in real time.

[0059] In an embodiment, construction data is collected in real time by sensors deployed around the steel cylinder retaining structure, wherein the construction data includes but is not limited to soil pressure, displacement and pore water pressure at the construction site.

[0060] The data preliminary processing module 2 is used to perform preliminary processing on the collected data.

[0061] In the embodiment, the preliminary processing includes filtering the collected data, removing noise and outliers, and performing standardization and normalization processing.

[0062] The data processing and analysis module 3 is used to perform data analysis and processing by using an improved MSD method to calculate the mobilization shear strength.

[0063] In the embodiment, the formula for calculating the mobilization shear strength is:

[0064] c mob (m) = β (m) * c u ;

[0065] In the formula, c mob (m) is the average mobilization value of the undrained shear strength of the soft soil layer when the backfill is loaded behind the m-th step steel cylinder, β(m) is the average strength mobilization rate of the soft soil layer when the backfill is loaded behind the m-th step steel cylinder, which can be obtained through a suitable stress-strain curve, c u is the average undrained shear strength of soft soil.

[0066] The displacement prediction module 4 is used to establish a stress-strain relationship model of the soil according to the mobilization shear strength and predict the displacement of the steel cylinder retaining structure.

[0067] In the embodiment, the stress-strain relationship model of the soil is obtained through laboratory tests and field data, so as to obtain the average strength mobilization rate β of the soft soil layer at different construction stages. For normal consolidated clay, the following empirical formula can be used for calculation:

[0068]

[0069] γ mob (m) = 2δ θ (m);

[0070] In the formula, γ mob is the average shear strain of the soft soil layer at step m, δ θ is the rotation angle of the steel cylinder around a point at the bottom of the cylinder body in the mth step, obtained through field measurement data, such as Figure 4 As shown, ensure the accuracy of the model.

[0071] In the embodiment, a modified Cam-Clay model or other constitutive models suitable for soft soil may be used.

[0072] In the embodiment, a finite element analysis tool is used to perform numerical simulation, and the calculated mobilization shear strength c of the soft soil layer is used. mob (m) The undrained shear strength parameters in the finite element model are updated. The calculation results are used to predict the displacement of the steel cylinder retaining structure at different construction stages. The law of conservation of energy is applied in the numerical simulation to ensure the accuracy and stability of the calculation.

[0073] The feedback adjustment module 5 is used to provide construction adjustment suggestions based on the prediction results, and dynamically adjust the construction parameters and optimize the stress-strain relationship model of the soil.

[0074] like Figure 2 As shown, the feedback adjustment module 5 includes: a real-time feedback unit 51 and a dynamic adjustment unit 52 .

[0075] The real-time feedback unit 51 is used to provide real-time feedback to the construction team based on the prediction results and provide construction adjustment suggestions.

[0076] The dynamic adjustment unit 52 is used to dynamically adjust the construction parameters and optimize the stress-strain relationship model of the soil according to the real-time monitoring data and prediction results.

[0077] like Figure 3 As shown, a displacement prediction method for a steel cylinder retaining structure on a soft soil foundation comprises:

[0078] Step S1, collecting construction data in real time through sensors deployed around the steel cylindrical retaining structure.

[0079] In an embodiment, the construction data includes, but is not limited to, soil pressure, displacement, and pore water pressure at the construction site.

[0080] Step S2, filtering the collected data, removing noise and outliers, and performing standardization and normalization processing.

[0081] Step S3, analyzing and processing the data after preliminary processing by MSD method to calculate the mobilization shear strength.

[0082] In the embodiment, the formula for calculating the mobilization shear strength is:

[0083] c mob (m) = β (m) * c u ;

[0084] In the formula, c mob (m) is the average mobilization value of the undrained shear strength of the soft soil layer when the backfill is loaded behind the m-th step steel cylinder, β(m) is the average strength mobilization rate of the soft soil layer when the backfill is loaded behind the m-th step steel cylinder, which can be obtained through a suitable stress-strain curve, c u is the average undrained shear strength of soft soil.

[0085] Step S4, based on the mobilization shear strength, a stress-strain relationship model of the soil is established to predict the displacement of the steel cylindrical retaining structure.

[0086] Step S5: Based on the prediction results, real-time feedback is provided to the construction team, and construction adjustment suggestions are provided.

[0087] Step S6, dynamically adjusting construction parameters and optimizing the stress-strain relationship model of the soil according to the real-time monitoring data and prediction results.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A displacement prediction system for steel cylinder retaining structure on soft soil foundation, characterized in that: include: Data acquisition modules, deployed around the steel cylinder retaining structure, are used to monitor construction data in real time; A data preliminary processing module is used to perform preliminary processing on the collected data; Data processing and analysis module, used for data analysis and processing by MSD method, and calculation of mobilization shear strength; The displacement prediction module is used to establish a stress-strain relationship model of the soil based on the mobilized shear strength and predict the displacement of the steel cylinder retaining structure; The feedback adjustment module is used to provide construction adjustment suggestions based on the prediction results, dynamically adjust construction parameters and optimize the stress-strain relationship model of the soil.

2. The displacement prediction system of a steel cylinder retaining structure on soft soil foundation according to claim 1 is characterized in that: In the data acquisition module, construction data is collected in real time through sensors deployed around the steel cylinder retaining structure, wherein the construction data includes but is not limited to soil pressure, displacement and pore water pressure at the construction site.

3. The displacement prediction system of a steel cylinder retaining structure on soft soil foundation according to claim 1 is characterized in that: In the data preliminary processing module, preliminary processing includes filtering the collected data, removing noise and outliers, and performing standardization and normalization processing.

4. The displacement prediction system for a steel cylinder retaining structure on a soft soil foundation according to claim 1 is characterized in that: In the data processing and analysis module, the formula for calculating the mobilization shear strength is: c mob (m)=β(m)*c u ; In the formula, c mob (m) is the average mobilization value of the undrained shear strength of the soft soil layer when the backfill behind the m-th step steel cylinder is loaded, β(m) is the average strength mobilization rate of the soft soil layer when the backfill behind the m-th step steel cylinder is loaded, c u is the average undrained shear strength of soft soil.

5. The displacement prediction system for a steel cylinder retaining structure on a soft soil foundation according to claim 1 is characterized in that: In the displacement prediction module, the stress-strain relationship model of the soil is obtained through laboratory tests and field data, so as to obtain the average strength mobilization rate β of the soft soil layer at different construction stages. For normal consolidated clay, the following empirical formula can be used for calculation: c mob (m)=2δ θ (m); In the formula, γ mob is the average shear strain of the soft soil layer at step m, δ θ It is the rotation angle of the m-th step steel cylinder around a point on the lower part of the cylinder body, obtained through field measured data.

6. The displacement prediction system for a steel cylinder retaining structure on a soft soil foundation according to claim 1 is characterized in that: In the displacement prediction module, the finite element analysis tool is used for numerical simulation, and the calculated mobilization shear strength c of the soft soil layer is used. mob (m) The undrained shear strength parameters in the finite element model are updated and the calculation results are used to predict the displacement of the steel cylinder retaining structure at different construction stages.

7. The displacement prediction system for a steel cylinder retaining structure on a soft soil foundation according to claim 1 is characterized in that: The feedback adjustment module comprises: Real-time feedback unit, used to provide real-time feedback to the construction team based on the prediction results and provide construction adjustment suggestions; The dynamic adjustment unit is used to dynamically adjust the construction parameters and optimize the stress-strain relationship model of the soil according to the real-time monitoring data and prediction results.

8. A method for predicting displacement of a steel cylinder retaining structure on a soft soil foundation, characterized in that: include: Step S1, collecting construction data in real time through sensors deployed around the steel cylindrical retaining structure; Step S2, filtering the collected data, removing noise and outliers, and performing standardization and normalization processing; Step S3, analyzing and processing the preliminarily processed data by using the MSD method to calculate the mobilization shear strength; Step S4, establishing a stress-strain relationship model of the soil according to the mobilization shear strength, and predicting the displacement of the steel cylindrical retaining structure; Step S5: Provide real-time feedback to the construction team based on the prediction results and provide construction adjustment suggestions; Step S6, dynamically adjusting construction parameters and optimizing the stress-strain relationship model of the soil according to the real-time monitoring data and prediction results.

9. The displacement prediction method of a steel cylinder retaining structure on a soft soil foundation according to claim 8, characterized in that: In step S1, the construction data includes but is not limited to soil pressure, displacement and pore water pressure at the construction site.

10. The displacement prediction method of a steel cylinder retaining structure on a soft soil foundation according to claim 8, characterized in that: In step S3, the formula for calculating the mobilization shear strength is: c mob (m)=β(m)*c u ; In the formula, c mob (m) is the average mobilization value of the undrained shear strength of the soft soil layer when the backfill is loaded behind the m-th step steel cylinder, β(m) is the average strength mobilization rate of the soft soil layer when the backfill is loaded behind the m-th step steel cylinder, which can be obtained through a suitable stress-strain curve, c u is the average undrained shear strength of soft soil.

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