Method and system for predicting settlement of loess foundation of existing building when underground water level rises

Abstract

The invention discloses a method and system for predicting settlement of a loess foundation of an existing building when the underground water level rises, and belongs to the technical field of foundation settlement prediction. The prediction method disclosed by the invention comprises the following steps: S1, layering loess foundations in a prediction area, and calculating boundary stress of each layer of loess foundation under the condition of different water contents according to basic physical property indexes of each layer of loess foundation; s2, according to the obtained boundary stress, respectively calculating the compression stability strain of each layer of loess foundation under the action of self-weight stress and in the use period of the building under the condition of different water contents; and S3, according to the compression stable strain of each layer of loess foundation, the final settlement amount of the loess foundation influenced by the rising of the underground water level is predicted. The prediction method obviously solves the technical problem that the existing prediction method is difficult to predict the influence of the underground water level rise on the foundation settlement after the building is completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of foundation settlement prediction, and particularly relates to a method and system for predicting the settlement of the loess foundation of existing buildings when the groundwater level rises. Background Art

[0002] In the vast loess area, the geological conditions are complex and the soil structure is loose. Therefore, when building buildings in this area, the problem of foundation settlement and deformation is particularly prominent. The settlement of the foundation not only concerns the stability of the building, but also directly affects its normal use function. To ensure the safety and durability of the building, it is crucial to follow the strict requirements in the Code for Design of Building Foundation. The code clearly states that: "The calculated value of the foundation deformation of the building must be strictly controlled within the allowable value of the foundation deformation." Given the potential threat posed by foundation settlement to the safety of the building, it is particularly crucial to conduct detailed and accurate foundation settlement prediction before the start of engineering design and construction. This step can not only help engineers evaluate the stability of the foundation, but also ensure that the building meets the established safety standards in terms of foundation deformation. Through scientific prediction, the structural damage and functional failure of the building caused by foundation settlement can be effectively avoided. In addition, the dynamic change of groundwater in the loess area cannot be ignored. The rise of the groundwater level is often accompanied by an increase in the water content of the foundation, which may accelerate the settlement speed of the foundation and even cause the settlement amount to exceed expectations. Therefore, for existing buildings, it is particularly urgent to continuously monitor the change of the water content of the foundation and adjust the settlement prediction model accordingly. Only by closely monitoring the dynamics of the water content of the foundation, combining advanced prediction techniques and real-time monitoring data, can the trend of foundation settlement be predicted timely and accurately, providing a scientific basis for possible foundation reinforcement projects. This not only helps to ensure the safety and stability of the building, but also enables rapid reinforcement measures to be taken when necessary to minimize potential risks.

[0003] Currently, in the loess area, the foundations of most buildings mainly rely on the late Pleistocene loess layer. To ensure the stability and safety of the buildings, accurate prediction of their foundation settlement is particularly important. Generally, this kind of prediction work is carried out before the construction of the building, mainly by taking foundation soil samples and conducting compression tests in the laboratory. Through these tests, the compressibility index of the foundation soil can be obtained, and then the settlement of the foundation can be predicted according to relevant specifications. However, what this method reflects is only the corresponding situation of the foundation during the construction period of the building. It fails to fully consider the foundation settlement changes that may be brought about by the rise of the groundwater level after the completion of the building. The change of the groundwater level has an undeniable impact on the physical and mechanical properties of the foundation soil. Therefore, how to predict the foundation settlement more comprehensively and accurately, especially considering the change of the groundwater level, has become an urgent problem to be solved. Summary of the Invention

[0004] The object of the present invention is to provide a method and system for predicting the settlement of the loess foundation of existing buildings when the groundwater level rises, so as to solve the technical problem that it is difficult for the existing prediction methods to predict the influence of the rising groundwater level on the foundation settlement after the completion of the buildings in the loess area.

[0005] To achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a method for predicting the settlement of the loess foundation of existing buildings when the groundwater level rises, including the following steps: S1: Stratify the loess foundation in the prediction area, and calculate the boundary stress of each layer of the loess foundation under different moisture contents according to the basic physical property indexes of each layer of the loess foundation; S2: According to the obtained boundary stress, calculate the compression stable strain of each layer of the loess foundation under the action of self-weight stress and during the use period of the building under different moisture contents respectively; S3: Predict the final settlement amount of the loess foundation affected by the rising groundwater level according to the compression stable strain of each layer of the loess foundation.

[0006] Furthermore, the calculation formula for calculating the boundary stress of each layer of the loess foundation under different moisture contents according to the basic physical property indexes of each layer of the loess foundation is as follows: ; Where: - Boundary stress, unit: kPa; - Moisture content of the loess foundation, unit: %; - Plastic limit of the loess foundation, unit: %; - Dry density of the loess foundation, unit: g / cm 3 ; - Saturated density of the loess foundation, unit: g / cm 3 ; - Base of the natural logarithm; Wherein, the moisture content of the loess foundation is the natural moisture content or the moisture content of the loess foundation after the change of the groundwater level.

[0007] Furthermore, when the moisture content of the loess foundation is equal to the natural moisture content , the calculated boundary stress is , as shown in the following formula: ; When the moisture content of the loess foundation is equal to the moisture content of the loess foundation after the change of the groundwater level When calculating, the boundary stress obtained is , as shown in the following formula: .

[0008] Furthermore, according to the obtained boundary stress, the calculation formulas for the compression stable strain of each layer of loess foundation under self-weight stress and during the service period of the building under different moisture contents are as follows: ; Where: - Compression stable strain; - Initial porosity of loess foundation; - Load on loess foundation; - Base of natural logarithm; , , Are parameters related to the compression stage respectively.

[0009] Furthermore, , , The value relationship is as follows: When ≤ , , , Take the values of 1.0, -0.1, 0.8 respectively; When > , , , Take the values of 1.6, -0.57, 0.26 respectively.

[0010] Furthermore, when is equal to , is equal to , the calculated compression stable strain is , as shown in the following formula: ; When is equal to , is equal to plus , the calculated compression stable strain is , as shown in the following formula: ; When is equal to , equals and When the sum is obtained, the calculated compression stable strain is , as shown in the following formula: ; Where: is equals When, the compression stable strain of the loess foundation after unloading and then under the action of self-weight stress; is equals When, during the service period of the building, the compression stable strain of the loess foundation under the combined action of and without being affected by the rising groundwater level; is equals When, during the service period of the building, the compression stable strain of the loess foundation under the condition of being affected by the rising groundwater level; Among them, is the self-weight stress of the loess foundation; is the additional stress of the loess foundation after building the building.

[0011] Furthermore, the calculation formula used to predict the final settlement of the loess foundation affected by the rising groundwater level according to the compression stable strain of each layer of the loess foundation is as follows: ; Where, - The final settlement of the loess foundation affected by the rising groundwater level, in mm; - The compression of the - layer of the loess foundation, in mm; The compression stable strain of the - layer of the loess foundation after unloading and then under the action of self-weight stress; and Under the combined action of after the building is completed, the compression stable strain of the - The thickness of the - The number of layers of the loess foundation; - After the building is completed, With Under the combined action of the Type of compression stable strain of the loess foundation of the layer, taking values of 2 or 3.

[0012] Furthermore, when the loess foundation is divided into layers, any layer is denoted as the layer. When the loess foundation of the layer is not affected by the rising groundwater level, = 2; when the loess foundation of the layer is affected by the rising groundwater level, = 3.

[0013] The present invention also discloses a prediction system for the settlement of the loess foundation of an existing building when the groundwater level rises, including: The first calculation module: used to layer the loess foundation of the prediction area and calculate the boundary stresses of each layer of the loess foundation under different moisture contents according to the basic physical property indexes of each layer of the loess foundation; The second calculation module: used to calculate the compression stable strains of each layer of the loess foundation under the action of self-weight stress and during the building use period under different moisture contents according to the obtained boundary stresses; The prediction module: used to predict the final settlement amount of the loess foundation affected by the rising groundwater level according to the compression stable strains of each layer of the loess foundation.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a method for predicting the settlement of the loess foundation of an existing building when the groundwater level rises. By calculating the boundary stresses of the loess foundation under different moisture contents through the basic physical property indexes of the loess foundation, and then calculating the strains of the loess foundation under self-weight stress and the compression stable strains during the building use period under different moisture contents, the final settlement amount of the loess foundation affected by the rising groundwater level is predicted. This method does not require indoor compression experiments and can predict the foundation settlement at the calculation point position only through the basic physical property indexes of the loess foundation. It can realize the prediction of the foundation settlement amount of an existing building under the condition of rising groundwater level, improve the analysis efficiency of foundation settlement, and significantly solve the technical problem that it is difficult for the existing prediction methods to predict the influence of the rising groundwater level on the foundation settlement after the building is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Is a flowchart of the method for predicting the settlement of the loess foundation of an existing building when the groundwater level rises according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solution in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0017] The present invention discloses a method for predicting the settlement of the loess foundation of existing buildings when the groundwater level rises. As Figure 1 shown, it includes the following steps: Step 1: Layer the loess foundation of the prediction area, and calculate the boundary stress of each layer of the loess foundation under different moisture contents according to the basic physical property indexes of each layer of the loess foundation. The main formulas are as follows: (1); Where: - The boundary stress, with the unit of kPa; - The moisture content of the loess foundation, with the unit of %; - The plastic limit of the loess foundation, with the unit of %; - The dry density of the loess foundation, with the unit of g / cm 3 ; - The saturated density of the loess foundation, with the unit of g / cm 3 ; - The base of the natural logarithm; When is equal to , calculate the boundary stress of the natural loess, denoted as , as shown in the following formula: (2); When is equal to , the boundary stress of the loess foundation after the groundwater level change can be calculated, denoted as , as shown in the following formula: (3); Where: is the natural moisture content, is the moisture content of the loess foundation after the groundwater level change; Step 2: According to the obtained boundary stress, calculate the compression stable strain of each layer of the loess foundation under the action of self-weight stress and during the use period of the building under different moisture contents respectively. The main formulas are as follows: (4); Among them: - Compression stable strain; - Initial porosity of loess foundation; - Load on loess foundation; - Base of natural logarithm; 、 、 Are parameters related to the compression stage respectively; 、 、 The value relationship is shown in Table 1.

[0018] Table 1: A, B, C Value relationship .

[0019] When there is no influence of water level change, at this time is equal to , is equal to , and the compression stable strain of the loess foundation after unloading and then under the action of self-weight stress can be obtained from Equation (4), denoted as ; when there is no influence of water level change and during the use period after the building is completed, at this time is the self-weight stress of the loess foundation and the additional stress of the loess foundation after building the building The sum of, from Equation (4), during the use period of the building, the compression stable strain of the loess foundation under the combined action of and without being affected by the rising groundwater level, denoted as ; When the loess foundation is affected by the rising groundwater level, at this time is equal to , is the self-weight stress of the loess foundation and the additional stress of the loess foundation after building the building The sum of, from Equation (4), during the use period of the building, the compression stable strain of the loess foundation under the condition of being affected by the rising groundwater level, denoted as ; Step 3: Predict the final settlement of the loess foundation affected by the rising groundwater level according to the compression stable strain of each layer of loess foundation. The main formula is as follows: (5); Among them, - Final settlement of loess foundation affected by rising groundwater level, unit: mm; - The compression of the loess foundation of the - layer, in mm; compression stable strain of the loess foundation of the - layer after unloading and then under the action of self-weight stress; After the building is completed, under the combined action of compression stable strain of the loess foundation of the - layer; thickness of the loess foundation of the layer, in mm; - number of layers of the loess foundation; After the building is completed, under the combined action of types of compression stable strain of the loess foundation of the

[0020] The prediction method of the present invention can more accurately simulate and predict the specific process of settlement of the loess foundation under the condition of rising groundwater level by analyzing in detail the boundary stress and compression stable strain of the loess foundation under different water content conditions; the settlement of each layer of soil is calculated through the strain under different conditions, and a more refined prediction result can be obtained; in practical applications, the water content of the loess foundation is greatly affected by the change of the groundwater level; this method not only considers the natural water content and the water content after the change of the groundwater level, but also improves the simulation ability of the influence of the change of the groundwater level on the soil by calculating the boundary stress and strain under different water contents, and can better cope with the dynamic environmental changes; by analyzing the loess foundation layer by layer, the settlement performance of each layer of soil can be accurately determined. The compression stable strains of different soil layers are different, and the layer-by-layer analysis can avoid the errors caused by rough assumptions and improve the accuracy of settlement prediction; this prediction method not only considers the influence of self-weight stress, but also considers the additional stress during the use of the building, which is crucial for long-term settlement prediction. The dynamic changes during the use of the building will also affect the foundation settlement. The influence of the use of the building is considered through specific load calculations in the method.

[0021] Meanwhile, this prediction method integrates multiple factors (such as initial porosity, boundary stress, load, etc.) through multi-step calculations and accurately calculates the compression stable strain and settlement of the loess foundation using formulas. In particular, by combining strain and soil layer thickness, the final settlement prediction of the loess foundation can be obtained, enhancing the application value in practical engineering. By considering the influence of rising groundwater levels on soil moisture content and stress distribution, the possible settlement changes of the foundation under the background of groundwater level changes can be effectively predicted. This provides an important basis for designing prevention and control measures and the structural safety of buildings. It can be adjusted according to different soil properties, different groundwater level change situations, and the actual conditions of different buildings, with high adaptability, and can provide accurate predictions in different geological environments and engineering backgrounds.

[0022] The present invention also discloses a settlement prediction system for the loess foundation of existing buildings when the groundwater level rises, including: The first calculation module: used to layer the loess foundation of the prediction area and calculate the boundary stress of each layer of the loess foundation under different moisture content conditions according to the basic physical property indexes of each layer of the loess foundation. The second calculation module: respectively calculate the compression stable strain of each layer of the loess foundation under the action of self-weight stress and during the use of the building under different moisture content conditions according to the obtained boundary stress. The prediction module: used to predict the final settlement of the loess foundation affected by the rising groundwater level according to the compression stable strain of each layer of the loess foundation.

[0023] This prediction system conducts a layered treatment on the loess foundation of the prediction area through the first calculation module. This refined layering method can more accurately reflect the physical property differences between different soil layers, thereby improving the accuracy of settlement prediction. And it can calculate according to the boundary stress under different moisture content conditions, which reflects the actual influence of the rising groundwater level on the moisture content and mechanical properties of the loess foundation, making the prediction results closer to the actual situation. The second calculation module therein not only considers the compression stable strain under the action of self-weight stress but also considers the influence of additional stress that may occur during the use of the building. This comprehensive stress analysis helps to improve the reliability of settlement prediction. This prediction system is applicable to the settlement prediction of loess foundations under various geological and environmental conditions, has strong generality and practicality, and can provide strong technical support for engineering design and construction.

[0024] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] Embodiment 1 Taking the loess foundation of the teaching building of College A in a certain place as an example, the basic physical properties of its loess foundation are shown in Table 2; the teaching building of College A in a certain place was built in 1956, with a building area of 15,200 m 2 , the foundation burial depth is 2.7 - 3.7 m, the foundation width is 0.6 - 2.2 m, the base pressure is 250 kPa, and the buried depth of the groundwater level is 15 m; after Lake A began to store water in 1958, the water level gradually rose to 2 - 4 m in 1985, and the water level generally rose from the depth of 12 meters of the foundation under the base to the base position (the average moisture content in this depth range rose from 16.1% to 29%), causing a large settlement of the loess foundation of this teaching building; the settlement observation results of this teaching building for 25 years show that the maximum settlement has reached 495.9 mm, and then the settlement rate slows down and tends to be stable.

[0026] Table 2: Basic Physical Properties of the Loess Foundation of the Teaching Building of College A in a Certain Place (1957) .

[0027] Using the prediction method disclosed in the present invention, according to the basic physical property indexes in Table 2 and combined with the change of moisture content, the calculation is carried out, including the following steps: First, the boundary stress equal to when and the boundary stress equal to when after the groundwater level rises are calculated through formulas (2) and (3); then, the compression stable strain of the loess foundation within the depth of 12 m of the foundation after unloading and then under the action of the self-weight stress ( ) and the compression stable strain of the loess foundation under the influence of the rising groundwater level under the self-weight stress ( ) and the additional stress ( ) of the loess foundation after building the building are calculated through formula (4). , the compression stable strain of the loess foundation within the depth range of 13 - 15m after unloading and then under the action of self-weight stress ( ); and the compression stable strain of the self-weight stress ( ) and the additional stress ( ) of the loess foundation after building construction without being affected by the rising groundwater level ; The specific calculation data is shown in Table 3. It can be seen that by using the prediction method of the present invention, only the water content, plastic limit, dry density, and saturated density of the loess foundation at different depths of each layer of loess before building construction need to be known, and the final settlement of the existing building loess foundation when the groundwater level rises can be calculated according to the water content of each layer of loess at different depths of the loess foundation after the change of the groundwater level during use. This method does not require taking soil for indoor compression tests, has high analysis efficiency, and can provide a basis for foundation treatment in a timely manner.

[0028] In Table 3, represents the average self-weight stress of the th layer of loess foundation starting from the foundation ground surface, and the calculation formula is as follows: (6); Where: is the foundation embedment depth; is the unit weight of the soil within the foundation embedment depth; , are respectively the unit weight and thickness of each layer of soil within the depth range above the th layer of loess foundation below the foundation bottom surface; , are respectively the unit weight and thickness of the th layer of loess foundation below the foundation bottom surface.

[0029] represents the average additional stress of the th layer of loess foundation starting from the foundation bottom surface, and the calculation formula is as follows: (7); Where: is the additional stress distribution coefficient at the calculation point on the top surface of the th layer; is the additional stress distribution coefficient at the calculation point on the bottom surface of the th layer; is the additional foundation pressure at the foundation bottom.

[0030] The prediction method for the settlement of the loess foundation of existing buildings when the groundwater level rises disclosed in the present invention comprehensively considers the changes in the physical and mechanical properties of the loess foundation under different water contents, as well as the combined action of self-weight stress and the load during the use of the building, so as to be able to predict the foundation settlement more comprehensively and accurately; and by calculating the compression stable strain of each layer of the loess foundation layer by layer and considering the influence after the groundwater level rises, this method can dynamically reflect the change process of the foundation settlement and improve the adaptability of the prediction; parameters related to the compression stage are introduced , , , as well as the calculation formula of the boundary stress, making the prediction process more quantitative and model-based, facilitating the implementation of computer programs and automated processing; furthermore, this method is not only applicable to the prediction of the foundation settlement of newly built buildings, but also applicable to the prediction of the foundation settlement of existing buildings when the groundwater level rises, and has strong practicability; the present invention provides a complete prediction system framework, including the whole process from data input, parameter calculation to the prediction of the final settlement amount, making the prediction work more systematic and standardized. This method has strong scalability in basic principles and framework, and can be further refined or other influencing factors can be introduced according to actual situations to improve the prediction accuracy and scope of application.

[0031] Table 3: Prediction of the settlement of the loess foundation of the teaching building of College A in a certain place (prediction method of the present invention) .

[0032] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A prediction method for the settlement of the loess foundation of existing buildings when the groundwater level rises, characterized in that, It includes the following steps: S1: Layer the loess foundation in the prediction area, and calculate the boundary stresses of each layer of the loess foundation under different moisture contents according to the basic physical property indexes of each layer of the loess foundation; S2: According to the obtained boundary stresses, calculate the compression stable strains of each layer of the loess foundation under the action of self-weight stress and during the use of the building under different moisture contents respectively; S3: Predict the final settlement amount of the loess foundation affected by the rising groundwater level according to the compression stable strain of each layer of the loess foundation.

2. The prediction method for the settlement of the loess foundation of existing buildings when the groundwater level rises according to claim 1, characterized in that, The calculation formula for calculating the boundary stresses of each layer of the loess foundation under different moisture contents according to the basic physical property indexes of each layer of the loess foundation is as follows: ； Wherein: - The boundary stress, in kPa; - The water content of the loess foundation, in %; - The plastic limit of the loess foundation, in %; - The dry density of the loess foundation, in g / cm 3 ; - The saturated density of the loess foundation, in g / cm 3 ; - The base of the natural logarithm; Among them, the water content of the loess foundation is the natural water content or the water content of the loess foundation after the change of the groundwater level.

3. The prediction method for the settlement of the loess foundation of existing buildings when the groundwater level rises according to claim 2, characterized in that, When the moisture content of the loess foundation is equal to the natural moisture content , the calculated boundary stress is , as shown in the following formula: ； When the moisture content of the loess foundation is equal to the moisture content of the loess foundation after the change of the groundwater level , the calculated boundary stress is , as shown in the following formula: 。 4. The prediction method for the settlement of the loess foundation of existing buildings when the groundwater level rises according to claim 3, characterized in that, The calculation formula for calculating the compression stable strains of each layer of the loess foundation under the action of self-weight stress and during the use of the building under different moisture contents respectively according to the obtained boundary stresses is as follows: ； Wherein: - Compression stable strain; - Initial porosity of loess foundation; - Load on loess foundation; - Base of natural logarithm; and and are parameters related to the compression stage, respectively.

5. The prediction method for the settlement of the loess foundation of existing buildings when the groundwater level rises according to claim 4, characterized in that, , , The value relationship is as follows: When ≤ , , , take values of 1.0, -0.1, and 0.8 respectively; When > , , , take values of 1.6, -0.57, and 0.26 respectively.

6. The prediction method for the settlement of the loess foundation of existing buildings when the groundwater level rises according to claim 5, characterized in that, When equals , equals , the calculated compressive stable strain is , as shown in the following formula: ； When equals , equals and the sum of, the calculated compressive stability strain is as shown in the following equation: ； When equals , equals and the sum of, the calculated compressive stability strain is , as shown in the following equation: ； Wherein: is equal to the compression stable strain of the loess foundation under the action of self-weight stress after unloading; When equals during the service life of the building, the compression stability strain of the loess foundation under the combined action of and is not affected by the rising groundwater level; For equal to During the service life of the building, the compressive stable strain of the loess foundation under the influence of the rising groundwater level Among them, is the self-weight stress of the loess foundation; is the additional stress of the loess foundation after the construction of the building.

7. A method for predicting the settlement of the loess foundation of existing buildings when the groundwater level rises, characterized in that, The calculation formula for predicting the final settlement amount of the loess foundation affected by the rising groundwater level according to the compression stable strain of each layer of the loess foundation is as follows: ； Among them, - The final settlement of the loess foundation affected by the rising groundwater level, in mm; - The compression of the loess foundation in the layer, unit: mm; - The compression stable strain of the loess foundation in the - After the building is completed, Under the combined action with the compressive stable strain of the loess foundation on the th floor; - The thickness of the loess foundation of the layer, unit: mm; - The number of layers of the loess foundation; - After the building is completed, acting jointly with the types of compression stable strain of the loess foundation on the layer are 2 or 3.

8. A method for predicting the settlement of the loess foundation of existing buildings when the groundwater level rises, characterized in that, Wherein, When the loess foundation is divided into layers, any layer is denoted as the th layer. When the th layer of the loess foundation is not affected by the rising groundwater level, = 2; when the th layer of the loess foundation is affected by the rising groundwater level, = 3.

9. A system for predicting the settlement of the loess foundation of existing buildings when the groundwater level rises, characterized in that, It includes: The first calculation module: used for layering the loess foundation in the prediction area, and calculating the boundary stresses of each layer of the loess foundation under different moisture contents according to the basic physical property indexes of each layer of the loess foundation; The second calculation module: used for calculating the compression stable strains of each layer of the loess foundation under the action of self-weight stress and during the use of the building under different moisture contents respectively according to the obtained boundary stresses; The prediction module: used for predicting the final settlement amount of the loess foundation affected by the rising groundwater level according to the compression stable strain of each layer of the loess foundation.

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