Prediction method of enclosure lateral displacement and ground settlement caused by foundation pit dewatering considering groundwater barrier effect

Abstract

The present invention relates to the technical field of foundation pit environmental deformation prediction, and specifically discloses a method for predicting the lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering the groundwater barrier effect, comprising the following steps: obtaining the influencing parameters that cause foundation pit deformation; determining the basic coefficients of the influencing parameters; multiplying the basic coefficients with the environmental deformation prediction function under the pre-constructed basic working conditions to obtain the environmental deformation prediction function under the influencing parameters. The present invention obtains the prediction formulas for the maximum lateral displacement of foundation pit enclosures and the maximum surface settlement outside the pit through an empirical algorithm, which can more accurately predict the surrounding environmental deformation caused by foundation pit dewatering under the groundwater barrier effect, and provides great convenience for the selection and optimization of foundation pit engineering design.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of foundation pit environmental deformation prediction, and specifically is a method for predicting enclosure lateral displacement and ground settlement caused by foundation pit dewatering when groundwater barrier effect is taken into account. Background Art

[0002] In recent years, my country's economy has developed rapidly. With the accelerating process of domestic urbanization, many cities have increased their efforts to develop underground space, such as underground shopping malls, underground parking lots, and subways, etc., resulting in a large number of foundation pit projects. During the construction of foundation pits in water-rich areas, due to the high groundwater level, in order to facilitate construction, precipitation operations are often carried out before foundation pit excavation to lower the groundwater level. During the development process, foundation pit projects in cities are located in complex surrounding geological environments. For example, more and more deep foundation pit projects are adjacent to operating high-speed railways, subway tunnels, underground pipe galleries and other building structures. Therefore, the environmental problems caused by deep foundation pit construction have become one of the key issues that the geotechnical engineering community urgently needs to solve.

[0003] In fact, every process of foundation pit construction will cause deformation of the foundation pit, including lateral displacement of the retaining structure and settlement of the ground outside the pit. Dewatering before excavation is an essential construction step in the foundation pit construction process in water-rich areas. In order to check the single-well pumping capacity of the dewatering well and whether the dewatering well meets the design requirements, and to obtain the relevant hydrogeological parameters of the underground aquifer, dewatering operations are usually carried out before foundation pit excavation. Existing research and a large amount of engineering measurement data show that dewatering before foundation pit excavation will cause cm-level deformation of the retaining structure and further cause settlement of the ground outside the pit.

[0004] At present, the research on foundation pit deformation mainly focuses on the deformation of retaining structures and surface settlement outside the pit caused by the excavation process and precipitation during the excavation of the foundation pit. However, according to existing research, there are very few studies on precipitation before excavation, and most of the research is based on numerical simulation, field measurement, geotechnical testing and other means. These research methods have certain advantages and disadvantages. For numerical simulation, it is necessary to find a suitable constitutive model and suitable related parameters in the research process. By establishing a large number of numerical models to simulate a series of situations, the process is relatively complicated and requires high computer configuration and researchers' proficiency in software. For field measurements, the results often have certain empirical coefficients, and the practicality is low for different geological conditions. Geotechnical tests require more manpower and material resources to prepare, which is time-consuming and labor-intensive. In addition, the geotechnical test process is easily interfered by human factors and has certain errors. As for the empirical algorithm, it mainly conducts statistical summary and analysis on a large amount of measured data and numerical simulation calculation results in order to obtain a universal empirical prediction formula. Because of its advantages such as relatively simple formula, relatively accurate prediction data and relatively concise method, it can more accurately predict the deformation of the surrounding environment caused by foundation pit dewatering under the groundwater barrier effect, which provides great convenience for the selection and optimization of foundation pit engineering design. However, the existing technology lacks relevant research on the use of empirical algorithms to predict the deformation of the surrounding environment caused by foundation pit dewatering when considering the groundwater barrier effect. Summary of the invention

[0005] The purpose of the present invention is to provide a method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering while taking into account the groundwater barrier effect, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering the groundwater barrier effect comprises the following steps:

[0008] Obtaining influencing parameters that cause foundation pit deformation, the influencing parameters including foundation pit dewatering depth, subway station depth, distance between the foundation pit and the subway station, and foundation pit width;

[0009] Determine the basic coefficients of the influencing parameters, the basic coefficients including the basic coefficient of the distance between the foundation pit and the subway station, the basic coefficient of the foundation pit width and the basic coefficient of the buried depth of the subway station, the subway station is an existing adjacent structure, that is, a groundwater barrier;

[0010] The foundation coefficient is multiplied by the environmental deformation prediction function under the pre-constructed foundation condition to obtain the environmental deformation prediction function under the influencing parameters. The environmental deformation prediction function under the foundation condition includes the maximum enclosure lateral displacement function under the foundation condition and the maximum surface settlement function outside the pit under the foundation condition. The environmental deformation prediction function under the influencing parameters includes the prediction model of the maximum enclosure lateral displacement caused by foundation pit dewatering under the groundwater barrier effect and the prediction model of the maximum surface settlement outside the pit caused by foundation pit dewatering under the groundwater barrier effect, where:

[0011] The prediction model of the maximum lateral displacement of the enclosure caused by foundation pit dewatering under the groundwater barrier effect is:

[0012] δ hmax =δ 基础max α H α D α B ,in:

[0013] δ 基础max Represents the maximum side displacement function of the basic working condition, α H , α D and α B All are basic coefficients;

[0014] The prediction model of the maximum surface settlement outside the pit caused by foundation pit dewatering under the groundwater barrier effect is:

[0015] in:

[0016] δ v1max represents the maximum surface settlement function outside the pit in front of the station under basic conditions; δ v2max represents the maximum surface settlement function outside the pit behind the station under basic conditions; β H , β D , β B , γ H , γ D and γ B All are basic coefficients.

[0017] As a further solution of the present invention: the foundation coefficient of the distance between the foundation pit and the subway station and the foundation pit dewatering depth H d The basic coefficients of the distance between the foundation pit and the subway station include: the basic coefficient α of the influence of the distance between the foundation pit and the subway station on the maximum side displacement of the enclosure D And the foundation coefficient β of the influence of the distance between the foundation pit and the subway station on the maximum surface settlement outside the pit D and the basic coefficient γ D .

[0018] As a further solution of the present invention: the basic coefficient α D The function expression is:

[0019]

[0020] Where: H d represents the depth of foundation pit dewatering, D represents the distance between the foundation pit and the subway station, α D It represents the foundation coefficient of the distance between the foundation pit and the subway station, specifically the functional relationship between the ratio of the maximum enclosure lateral displacement to the maximum enclosure lateral displacement under the foundation working condition and the precipitation depth under different distances D between the foundation pit and the subway station.

[0021] As a further solution of the present invention: the basic coefficient β D The function expression is:

[0022]

[0023] Basic coefficient γ D The function expression is:

[0024]

[0025] Where: H d represents the depth of foundation pit dewatering, D represents the distance between the foundation pit and the subway station, β D It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the maximum surface settlement outside the pit in front of the station under different distances D between the foundation pit and the subway station and the precipitation depth; γ D It represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station and the maximum surface settlement outside the pit behind the station under the foundation working condition and the precipitation depth under different distances D between the foundation pit and the subway station.

[0026] As a further solution of the present invention: the foundation coefficient of the foundation pit width and the foundation pit dewatering depth H d It is related to the foundation pit width B. The basic coefficients of the foundation pit width include: the basic coefficient α of the influence of the foundation pit width on the maximum enclosure lateral displacement B And the basic coefficient β of the influence of foundation pit width on the maximum surface settlement outside the pit B and the basic coefficient γ B .

[0027] As a further solution of the present invention: the basic coefficient α B The function expression is:

[0028]

[0029] Where: H d represents the depth of foundation pit dewatering, B represents the width of foundation pit, and the foundation coefficient α B It represents the functional relationship between the ratio of the maximum enclosure lateral displacement under different foundation pit widths to the maximum enclosure lateral displacement under foundation working conditions and the precipitation depth.

[0030] As a further solution of the present invention: the basic coefficient β B The function expression is:

[0031]

[0032] Basic coefficient γ B The function expression is:

[0033]

[0034] Where: H d represents the foundation pit dewatering depth, B represents the foundation pit width, and the foundation coefficient β B It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the precipitation depth under different foundation pit widths and the maximum surface settlement outside the pit in front of the station under basic working conditions; the foundation coefficient γ B It represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station under different foundation pit widths and the maximum surface settlement outside the pit behind the station under basic working conditions and the precipitation depth.

[0035] As a further solution of the present invention: the foundation coefficient of the subway station burial depth and the foundation pit dewatering depth H d It is related to the buried depth H of the subway station. The basic coefficients of the buried depth of the subway station include: the basic coefficient α of the influence of the buried depth of the subway station on the maximum lateral displacement of the enclosure H And the basic coefficient β of the influence of subway station burial depth on the maximum surface settlement outside the pit H and the basic coefficient γ H .

[0036] As a further solution of the present invention: the basic coefficient α H The function expression is:

[0037]

[0038] Where: H d represents the depth of foundation pit dewatering, H represents the buried depth of subway station, and the foundation coefficient α H It represents the functional relationship between the ratio of the maximum enclosure lateral displacement under different subway station burial depths to the maximum enclosure lateral displacement under basic working conditions and the precipitation depth.

[0039] As a further solution of the present invention: the basic coefficient β H The function expression is:

[0040]

[0041] Basic coefficient γ H The function expression is:

[0042]

[0043] Where: H d represents the depth of foundation pit dewatering, H represents the buried depth of subway station, and the foundation coefficient β H It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the maximum surface settlement outside the pit in front of the station under different subway station burial depths and the precipitation depth; the foundation coefficient γ H It represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station under different subway station burial depths and the maximum surface settlement outside the pit behind the station under basic working conditions and the precipitation depth.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention obtains a prediction formula for the maximum lateral displacement of the foundation pit enclosure and the maximum surface settlement outside the pit through an empirical algorithm, which can more accurately predict the deformation of the surrounding environment caused by foundation pit dewatering under the groundwater barrier effect, and provides great convenience for the selection and optimization of foundation pit engineering design. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Flow chart of the method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering the groundwater barrier effect. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1 In an embodiment of the present invention, a method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering the groundwater barrier effect includes the following steps:

[0048] S101, obtaining influencing parameters that cause foundation pit deformation, wherein the influencing parameters include the foundation pit dewatering depth H d , the depth of the subway station H, the distance between the foundation pit and the subway station D, and the width of the foundation pit B;

[0049] S102, determining basic coefficients of influencing parameters, wherein the basic coefficients include a basic coefficient of the distance between the foundation pit and the subway station, a basic coefficient of the foundation pit width, and a basic coefficient of the buried depth of the subway station, wherein the subway station is an existing adjacent structure, i.e., a groundwater barrier;

[0050] In step S102 of the present application, the foundation coefficient of the distance between the foundation pit and the subway station and the foundation pit dewatering depth H dThe basic coefficients of the distance between the foundation pit and the subway station include: the basic coefficient α of the influence of the distance between the foundation pit and the subway station on the maximum side displacement of the enclosure D And the foundation coefficient β of the influence of the distance between the foundation pit and the subway station on the maximum surface settlement outside the pit D and the basic coefficient γ D ,in:

[0051] Basic coefficient α D The function expression is:

[0052]

[0053] Where: H d represents the depth of foundation pit dewatering, D represents the distance between the foundation pit and the subway station, α D It represents the foundation coefficient of the distance between the foundation pit and the subway station, specifically the functional relationship between the ratio of the maximum enclosure lateral displacement to the maximum enclosure lateral displacement under the foundation working condition and the precipitation depth under different distances D between the foundation pit and the subway station.

[0054] Basic coefficient β D The function expression is:

[0055]

[0056] Basic coefficient γ D The function expression is:

[0057]

[0058] Where: H d represents the depth of foundation pit dewatering, D represents the distance between the foundation pit and the subway station, β D It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the maximum surface settlement outside the pit in front of the station under different distances D between the foundation pit and the subway station and the precipitation depth; γ D It represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station and the maximum surface settlement outside the pit behind the station under the foundation working condition and the precipitation depth under different distances D between the foundation pit and the subway station.

[0059] Furthermore, in step S102 of the present application, the foundation coefficient of the foundation pit width and the foundation pit dewatering depth H d It is related to the foundation pit width B. The basic coefficients of the foundation pit width include: the basic coefficient α of the influence of the foundation pit width on the maximum enclosure lateral displacement B And the basic coefficient β of the influence of foundation pit width on the maximum surface settlement outside the pit B and the basic coefficient γ B ,in:

[0060] Basic coefficient α B The function expression is:

[0061]

[0062] Where: H d represents the depth of foundation pit dewatering, B represents the width of foundation pit, and the foundation coefficient α B It represents the functional relationship between the ratio of the maximum enclosure lateral displacement under different foundation pit widths to the maximum enclosure lateral displacement under foundation working conditions and the precipitation depth.

[0063] Basic coefficient β B The function expression is:

[0064]

[0065] Basic coefficient γ B The function expression is:

[0066]

[0067] Where: H d represents the foundation pit dewatering depth, B represents the foundation pit width, and the foundation coefficient β B It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the precipitation depth under different foundation pit widths and the maximum surface settlement outside the pit in front of the station under basic working conditions; the foundation coefficient γ B It represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station under different foundation pit widths and the maximum surface settlement outside the pit behind the station under basic working conditions and the precipitation depth.

[0068] Furthermore, in step S102 of the present application, the foundation coefficient of the subway station burial depth and the foundation pit dewatering depth H d It is related to the buried depth H of the subway station. The basic coefficients of the buried depth of the subway station include: the basic coefficient α of the influence of the buried depth of the subway station on the maximum lateral displacement of the enclosure H And the basic coefficient β of the influence of subway station burial depth on the maximum surface settlement outside the pit H and the basic coefficient γ H ,in:

[0069] Basic coefficient α H The function expression is:

[0070]

[0071] Where: H d represents the depth of foundation pit dewatering, H represents the buried depth of subway station, and the foundation coefficient α H It represents the functional relationship between the ratio of the maximum enclosure lateral displacement under different subway station burial depths to the maximum enclosure lateral displacement under basic working conditions and the precipitation depth.

[0072] Basic coefficient β H The function expression is:

[0073]

[0074] Basic coefficient γ H The function expression is:

[0075]

[0076] Where: H d represents the depth of foundation pit dewatering, H represents the buried depth of subway station, and the foundation coefficient β H It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the maximum surface settlement outside the pit in front of the station under different subway station burial depths and the precipitation depth; the foundation coefficient γ H It represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station under different subway station burial depths and the maximum surface settlement outside the pit behind the station under basic working conditions and the precipitation depth.

[0077] S103. Multiply the foundation coefficient by the pre-constructed environmental deformation prediction function under the foundation condition to obtain the environmental deformation prediction function under the influencing parameters. The environmental deformation prediction function under the foundation condition includes the maximum enclosure lateral displacement function of the foundation condition and the maximum surface settlement outside the pit function of the foundation condition. The environmental deformation prediction function under the influencing parameters includes a prediction model of the maximum enclosure lateral displacement caused by foundation pit dewatering under the groundwater barrier effect and a prediction model of the maximum surface settlement outside the pit caused by foundation pit dewatering under the groundwater barrier effect.

[0078] In step S103 of the embodiment of the present application, the maximum enclosure side displacement function of the basic working condition is:

[0079]

[0080] (The maximum enclosure side displacement function under the basic working condition is obtained from the maximum enclosure side displacement value under the basic working condition)

[0081] It should be noted that the maximum enclosure lateral displacement function of the basic working condition is obtained by fitting the maximum enclosure lateral displacement value of the basic working condition. Specifically, in this embodiment, the influencing parameters of the basic working condition are selected as the distance between the foundation pit and the subway station D=40, the burial depth of the subway station H=35.5, and the width of the foundation pit B=40. The maximum lateral displacement results of the enclosure structure under different precipitation conditions of the basic working condition are fitted to obtain the maximum enclosure lateral displacement function under the basic working condition; then, taking the basic working condition as the criterion, the maximum lateral displacement values ​​of the enclosure structure under other different parameter conditions are compared with the maximum lateral displacement value of the enclosure structure under the basic working condition, and then the basic coefficient expression under different working conditions is obtained.

[0082] The maximum surface settlement function outside the pit in front of the station under basic working conditions is:

[0083]

[0084] The maximum surface settlement function outside the pit behind the station under basic working conditions is:

[0085] δ 基础2max =0.33+0.41H d ;

[0086] Furthermore, the prediction model of the maximum enclosure lateral displacement caused by foundation pit dewatering under the groundwater barrier effect is:

[0087] δ hmax =δ 基础max α H α D α B ;

[0088] The prediction model of the maximum surface settlement outside the pit caused by foundation pit dewatering under the groundwater barrier effect is:

[0089]

[0090] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0091] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering the groundwater barrier effect, characterized in that: The following steps are involved: Obtaining influencing parameters that cause foundation pit deformation, the influencing parameters including foundation pit dewatering depth, subway station depth, distance between the foundation pit and the subway station, and foundation pit width; Determine the basic coefficients of the influencing parameters, the basic coefficients including the basic coefficient of the distance between the foundation pit and the subway station, the basic coefficient of the foundation pit width and the basic coefficient of the buried depth of the subway station, the subway station is an existing adjacent structure, that is, a groundwater seepage barrier; The foundation coefficient is multiplied by the environmental deformation prediction function under the pre-constructed foundation condition to obtain the environmental deformation prediction function under the influencing parameters. The environmental deformation prediction function under the foundation condition includes the maximum enclosure lateral displacement function under the foundation condition and the maximum surface settlement function outside the pit under the foundation condition. The environmental deformation prediction function under the influencing parameters includes the prediction model of the maximum enclosure lateral displacement caused by foundation pit dewatering under the groundwater barrier effect and the prediction model of the maximum surface settlement outside the pit caused by foundation pit dewatering under the groundwater barrier effect, where: The prediction model of the maximum lateral displacement of the enclosure caused by foundation pit dewatering under the groundwater barrier effect is: d hmax =d 基础max a H a D a B , among which: δ 基础max Represents the maximum side displacement function of the basic working condition, α H , α D and α B All are basic coefficients; The prediction model of the maximum surface settlement outside the pit caused by foundation pit dewatering under the groundwater barrier effect is: δ v1max represents the maximum surface settlement function outside the pit in front of the station under basic conditions; δ v2max represents the maximum surface settlement function outside the pit behind the station under basic conditions; β H , β D , β B , γ H , γ D and γ B All are basic coefficients.

2. The method for predicting lateral displacement of enclosures and ground subsidence caused by foundation pit dewatering when considering groundwater barrier effect according to claim 1 is characterized in that: The foundation coefficient of the distance between the foundation pit and the subway station is related to the foundation pit dewatering depth H d The basic coefficients of the distance between the foundation pit and the subway station include: the basic coefficient α of the influence of the distance between the foundation pit and the subway station on the maximum side displacement of the enclosure D And the foundation coefficient β of the influence of the distance between the foundation pit and the subway station on the maximum surface settlement outside the pit D and the basic coefficient γ D .

3. The method for predicting lateral displacement of enclosures and ground subsidence caused by foundation pit dewatering when considering groundwater barrier effect according to claim 2 is characterized in that: Basic coefficient α D The function expression is: a D =A D H d +B D , Where: H d represents the depth of foundation pit dewatering, D represents the distance between the foundation pit and the subway station, α D It represents the foundation coefficient of the distance between the foundation pit and the subway station, specifically the functional relationship between the ratio of the maximum enclosure lateral displacement to the maximum enclosure lateral displacement under the foundation working condition and the precipitation depth under different distances D between the foundation pit and the subway station.

4. The method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering groundwater barrier effect according to claim 3 is characterized in that: Basic coefficient β D The function expression is: b D =A D +B D H d , Basic coefficient γ D The function expression is: c D =A D +B D H d , Where: H d represents the depth of foundation pit dewatering, D represents the distance between the foundation pit and the subway station, β D It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the maximum surface settlement outside the pit in front of the station under the basic working condition and the precipitation depth under different distances D between the foundation pit and the subway station; γD represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station and the maximum surface settlement outside the pit behind the station under the basic working condition and the precipitation depth under different distances D between the foundation pit and the subway station.

5. The method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering groundwater barrier effect according to claim 1 is characterized in that: The basic coefficient of the foundation pit width and the foundation pit dewatering depth H d It is related to the foundation pit width B. The basic coefficients of the foundation pit width include: the basic coefficient α of the influence of the foundation pit width on the maximum side displacement of the enclosure B And the basic coefficient β of the influence of foundation pit width on the maximum surface settlement outside the pit B and the basic coefficient γ B .

6. The method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering groundwater barrier effect according to claim 5 is characterized in that: Basic coefficient α B The function expression is: α B =A B H d 2 +B B H d +C B , Where: H d represents the foundation pit dewatering depth, B represents the foundation pit width, and the foundation coefficient α B It represents the functional relationship between the ratio of the maximum enclosure lateral displacement under different foundation pit widths to the maximum enclosure lateral displacement under foundation working conditions and the precipitation depth.

7. The method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering groundwater barrier effect according to claim 6 is characterized in that: Basic coefficient β B The function expression is: b B =A B +B B H d , Basic coefficient γ B The function expression is: c B =A B +B B H d , Where: H d represents the foundation pit dewatering depth, B represents the foundation pit width, and the foundation coefficient β B It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the precipitation depth under different foundation pit widths and the maximum surface settlement outside the pit in front of the station under basic working conditions; the foundation coefficient γ B It represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station under different foundation pit widths and the maximum surface settlement outside the pit behind the station under basic working conditions and the precipitation depth.

8. The method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering groundwater barrier effect according to claim 1 is characterized in that: The foundation coefficient of subway station burial depth and foundation pit dewatering depth H d It is related to the buried depth H of the subway station. The basic coefficients of the buried depth of the subway station include: the basic coefficient α of the influence of the buried depth of the subway station on the maximum lateral displacement of the enclosure H And the basic coefficient β of the influence of subway station burial depth on the maximum surface settlement outside the pit H and the basic coefficient γ H .

9. The method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering groundwater barrier effect according to claim 8 is characterized in that: Basic coefficient α H The function expression is: a H =A H H d 2 +B H H d +1, Where: H d represents the depth of foundation pit dewatering, H represents the buried depth of subway station, and the foundation coefficient α H It represents the functional relationship between the ratio of the maximum enclosure lateral displacement under different subway station burial depths to the maximum enclosure lateral displacement under basic working conditions and the precipitation depth.

10. The method for predicting lateral displacement of enclosures and ground settlement caused by foundation pit dewatering when considering groundwater barrier effect according to claim 9, characterized in that: Basic coefficient β H The function expression is: b H =A H +B H H d , Basic coefficient γ H The function expression is: c H =A H +B H H d , Where: H d represents the depth of foundation pit dewatering, H represents the buried depth of subway station, and the foundation coefficient β H It represents the functional relationship between the ratio of the maximum surface settlement outside the pit in front of the station and the maximum surface settlement outside the pit in front of the station under different subway station burial depths and the precipitation depth; the foundation coefficient γ H It represents the functional relationship between the ratio of the maximum surface settlement outside the pit behind the station under different subway station burial depths and the maximum surface settlement outside the pit behind the station under basic working conditions and the precipitation depth.

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