A deep foundation pit construction whole process dynamic simulation and safety early warning system based on digital twinning
Patent Information
- Application Number
- CN202611195703.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-07
- Publication Date
- 2026-10-09
AI Technical Summary
[0010]有鉴于此，本发明提供一种基于数字孪生的深基坑施工全过程动态仿真与安全预警系统，以解决或缓解现有技术中存在的技术问题之一，至少提供一种有益的选择
第一，步序驱动消除切换瞬态盲区。以四元组描述每步序受力动作，使第二道支撑未锁而第三层土已挖的瞬态被识别为独立切片，相对步序允许位移越界即可橙警，较固定阈值平均提前若干个自然日发现风险。
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Figure CN122886480A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of geotechnical engineering construction simulation and risk early warning technology, and in particular to a dynamic simulation and safety early warning system for the entire process of deep foundation pit construction based on digital twins. Background Technology
[0002] Deep foundation pit engineering is characterized by the gradual switching of stress paths during excavation, the layer-by-layer formation of support stiffness, the time-varying coupling of groundwater and soil, and the nonlinear cumulative response of surrounding buildings and structures. Complex scenarios such as foundation pits deeper than 20 meters in densely populated urban areas, alternating dewatering excavation in soft soil areas, and the simultaneous formation of multi-ring supports using reverse construction methods are becoming increasingly common. However, traditional management methods have inherent defects in their underlying logic and step sequence.
[0003] First, fixed thresholds are decoupled from construction steps. Design thresholds are usually given based on the final working condition or several typical working conditions. Actual risks often occur at the moment of switching between two steps. For example, the second support has not yet been locked while the third layer of soil has been partially excavated. At this time, although the displacement has not reached the final alarm value, it has seriously exceeded the allowable displacement of this step. The existing practice of measuring with a global threshold makes early instability within the step invisible.
[0004] Second, the single-field criterion severs the coupling relationship of the three fields. The deformation of the foundation pit is the result of the combined action of the displacement field, stress field, and seepage field. Existing monitoring often alarms the horizontal displacement, support axial force, and water level independently, without considering the coupling effect of the effective stress increase caused by the drop in water level, which changes the displacement path. This results in false alarms when the water level slightly exceeds the warning level but the displacement remains stable, or false alarms when the displacement exceeds the warning level but none of the fields exceed the warning level.
[0005] Third, the simulation timeline is inconsistent with the actual timeline. Some solutions that introduce digital twins use natural time to drive the rotation or color change of the twin, without using construction actions as hard triggers for simulation advancement. This causes the twin to continue to change according to a false timeline during work stoppages, resulting in distorted initial values and drifting inversion parameters after work resumes.
[0006] Fourth, the reverse correction mechanism is lacking. Most twin systems only perform forward inference and do not feed back the measured residuals at each step to the soil parameters. As a result, the evolution of soft soil zonal deformation modulus, permeability and other properties with construction disturbance is ignored, and the prediction bias accumulates in the later stages.
[0007] Fifth, there is a disconnect between early warning and response. After the alarm is triggered, solutions are selected based on human experience without pre-calculating the recovery amount within the confidence window of the subsequent three steps using twin space, thus missing the golden window for response.
[0008] Sixth, the cumulative effect of step sequence is untraceable. Existing platforms store data using calendars as indexes, making it impossible to answer the question of which soil parameter deviation in the first step sequence caused the final state of the third step sequence. Accident debriefing can only rely on subjective speculation.
[0009] The root cause of the aforementioned defects lies in the fact that the four elements of step sequence, twinning, three fields, and confidence window are not organized into a common axis. This invention constructs a system from this root cause, without using the natural clock as the axis, without using fixed threshold single-field alarms, without using deep learning scoring to replace physical field correction, and without using point cloud stitching as twinning drive, thus distinguishing itself from existing conventional practices. Summary of the Invention
[0010] In view of this, the present invention provides a dynamic simulation and safety early warning system for the entire process of deep foundation pit construction based on digital twins, in order to solve or alleviate one of the technical problems existing in the prior art, and at least provide a beneficial option.
[0011] The technical solution of this invention is implemented as follows: A dynamic simulation and safety early warning system for the entire process of deep foundation pit construction based on digital twins, comprising: The construction step sequence deconstruction module is used to parse the design drawings, support schemes, dewatering schemes and schedules of the target deep foundation pit project into several construction step sequence slices arranged in chronological order. Each construction step sequence slice carries at least the step sequence number, start and end conditions, excavation depth range, support construction action set, dewatering instruction set and associated structure number. Non-stressed steps containing only measurement or acceptance actions are removed, and the excavation sections between two adjacent support installation actions are merged into the same slice. Each slice is attached with a preceding dependency identifier pointing to the adjacent stressed slice. The twin slice reconstruction module is used to generate a geometric-physical coupled twin in the virtual space based on the step slice output by the construction step sequence deconstruction module. It writes the node displacement vector and Gaussian stress vector of the last state of the previous step as the initial field of the current step mesh package, translates the support action and precipitation action of the current step into the activation instruction set in the mesh package, and extracts intermediate frames at a fixed step size to form a two-layer time tree with the step sequence as the parent axis and the extraction step size as the child axis. The three-field reverse correction module is used to calculate the residuals of the actual displacement field, actual stress field, actual pore water pressure field and the simulation three fields of the current step's twin after each construction step is completed and the actual monitoring data is returned. The three-field coupled residual vector is obtained and the residual vector is projected onto the soil parameter space. The deformation modulus, Poisson's ratio and permeability coefficient of the soil zone to which the current slice belongs are updated using the step-constrained correction method. At the same time, the measured groundwater level and the measured support axial force are used as hard boundaries to cover the original design false boundaries. The step confidence window calculation module is used to extrapolate the final state twin of the current step after back correction to the final state of the next step design, to obtain the predicted displacement field and the predicted stress field, and to calculate the safety margin and half width of the step confidence window in combination with the current step residual decay rate. The cascaded early warning module is used to issue cascaded early warning signals in yellow, orange and red levels when the simulation prediction value of any step exceeds the step confidence window, or the slope of the residuals of two consecutive steps exceeds the coupling convergence limit, or any single field in the three fields goes beyond the step exclusive boundary. The early warning signal carries the step number, the field that went beyond the boundary, the upper and lower edges of the confidence window and the recommended handling level, and automatically blocks the permission bit for the step to switch to the next force step. The disposal simulation module is used to call the twin slice reconstruction module to clone the current step sequence final state sub-body after the cascaded early warning module is triggered, generate three or more disposal scenarios such as adding prestressed support, deepening the operation of dewatering wells, and backfilling back pressure to the previous safe step sequence elevation, continue to push three steps and compare the number of steps required for the safety margin regression of each scenario with the confidence window recovery area, output the disposal suggestion sequence and write back the optimal scenario as a forced insertion step sequence slice; The step sequence traceability module is used to write the initial state field, final state field, residual vector, confidence window parameters, and early warning records of all step sequence slices into an immutable log according to the step sequence number, forming a traceability chain indexed by the step sequence. When design changes or monitoring supplementary tests are performed, only the corrected slices are added without overwriting the historical slices. The step sequence bus is used to connect the above modules with the step sequence number as the key, so that the physical pit, step sequence slice, twin sub-body, and early warning signal are mapped on the same time axis.
[0012] Furthermore, the construction step sequence deconstruction module expresses each construction step sequence slice as a quadruple. ,in For step sequence numbering, This is the excavation bottom elevation at the end of this step. This refers to the set of support actions performed within this sequence. This is the set of precipitation commands executed within this step sequence; During deconstruction, the current slice's preceding dependency identifier is forced to point to the number of its immediately preceding stressed slice, so that the twin slice reconstruction module inherits the initial displacement and stress values of all previous slice states during reconstruction, regardless of whether the natural clock is continuous.
[0013] Furthermore, the twin slice reconstruction module constructs an independent replaceable mesh package for each construction step slice, and the mesh package contains soil partition number, support component number, boundary constraint number and contact surface number; When the current step sequence starts, the nodal displacement vector and Gaussian stress vector of the last state of the previous step sequence are written as the initial field of the current mesh package. The support action and precipitation action of the current step sequence are translated into the activation instruction set within the mesh package. During the step sequence simulation, intermediate frames are extracted at a fixed step size, so that the twins form a two-layer time tree with the step sequence as the parent axis and the extraction step size as the child axis, which is used by the three-field back correction module for frame comparison.
[0014] Furthermore, the three-field reverse correction module performs the following operations: Let the current step sequence be... The actual monitoring data returned after the completion of the transmission forms a displacement vector. Stress vector pore pressure vector The final state of the current step sequence simulation is formed. , , Define the three-field coupled residual vector
[0015] in The weighting coefficients are adaptively determined based on the spatial density of monitoring points and satisfy the following conditions: ; Will Projecting onto the soil parameter space, the deformation modulus of the soil zone to which the current slice belongs is updated using the step-constrained correction method. Poisson's ratio Permeability coefficient This makes the norm of the final state residual in the next simultaneous partitioning step simulation... Less than this step sequence ; The measured groundwater level and measured support axial force are used as hard boundaries in the boundary condition matrix to cover the original design false boundaries.
[0016] Furthermore, the step sequence confidence window calculation module is configured to: extrapolate the current step sequence final state twin after back-correction to the next step sequence. The final state of the design is used to obtain the predicted displacement. With predicted stress ; Calculate the residual decay rate of the current step sequence. ; Define the step confidence half-width:
[0017] in The initial window width, , For calibration constants, This represents the number of valid monitoring points in this step sequence. This represents the theoretical number of points to be placed in this step sequence; Next-order safety margin vector ,when or When a plane falls into a prohibited area, it is considered to be outside the window and out of bounds.
[0018] Furthermore, the cascaded early warning module specifically performs the following: Yellow level: Single-step predicted displacement exceeds the step confidence window but does not continuously cross the limit, or residual decay rate. ; Orange level: Two consecutive steps Furthermore, the slope increases, or one of the three games exceeds the step sequence boundary but the other game does not; Red Level: Safety Margin for Next Step Or, the simulated axial force exceeds 0.9 times the component's limit, or the predicted bottom heave is greater than the excavation depth. ; The cascaded signal carries the step sequence number, the field of the out-of-bounds boundary, the upper and lower edges of the confidence window, the recommended handling level, and automatically blocks the permission bit for the step sequence to switch to the next force-bearing step sequence.
[0019] Furthermore, the disposal simulation module is configured as follows: Under a red or orange alert, at least three handling scenarios are generated, including adding prestressed supports, deepening the operation of dewatering wells, and backfilling and counter-pressurizing to the previous safe step elevation. In each scenario, the current step's final state sub-body is cloned in the twin slice reconstruction module, and scenario actions are applied, continuing for three steps; Comparing the results of the follow-up projections for each scenario, the safety margin regression was... The required number of steps and the confidence window recovery area are sorted by recovery efficiency, and the output processing suggestion sequence is sorted. The optimal scenario is written back to the step sequence bus as a forced insertion step sequence slice.
[0020] Furthermore, it also includes a step sequence tracing module, which is used to write the initial state field, final state field, residual vector, confidence window parameters, and early warning records of all step sequence slices into an immutable log according to the step sequence number, forming a tracing chain indexed by the step sequence. When any step is modified in design or supplemented by monitoring, only the correction slice is allowed to be added at the end of the traceability chain. Overwriting the historical slice is prohibited, so that the three-track synchronous screen of physical foundation pit - twin body - early warning judgment can be played back at any time.
[0021] Furthermore, the system uses the construction sequence as the sole time axis, replacing the monitoring flow that is based on a natural clock. Before entering the three-field reverse correction module, the sensor data stream of the physical foundation pit is first stamped by the construction step sequence deconstruction module, so that the gap period data that does not belong to any force-bearing step sequence does not participate in the residual calculation, but is only stored in the step sequence gap cache as a twin static relaxation term.
[0022] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions: First, step-by-step driving eliminates the transient blind spot during switching. The quadruple describes the force action of each step sequence, so that the transient state where the second support is not locked and the third layer of soil has been dug is identified as an independent slice. The orange alert is triggered when the displacement of the relative step sequence exceeds the limit, and the risk is detected on average several natural days earlier than the fixed threshold.
[0023] Second, the three-field coupling residual reduces false alarms in a single field. Adaptive to spatial density of monitoring points in soft soil areas The weights are automatically increased, and the system can still capture vibration disturbances when the water level drops slightly but the displacement coupling residue is large. Vibration disturbances with slight single-field overshoot but small three-field residuals will not be falsely reported.
[0024] Third, reverse correction allows soil parameters to evolve with construction. Each step involves final-state correction. This significantly reduced the prediction error of permeability after step 6 of the Linjiang foundation pit project.
[0025] Fourth, the step-order confidence window replaces the global threshold. Follow When the index contracts, the construction window widens to reduce disruptions during smoother construction, while the window tightens to intercept residual rebounds in advance.
[0026] Fifth, the cascaded three-level signal comes with a step sequence stamp and field label, which can distinguish between local window crossings within the current step sequence and cumulative boundary crossings across steps, thus avoiding red alerts caused by data jitter at night.
[0027] Sixth, the disposal simulation unit clones and continues the three-step sequence in the twin space, giving a ranking of recovery efficiency. In a certain subway foundation pit embodiment, the backfilling counterpressure scenario returns to the safety window several steps earlier than the additional support.
[0028] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a diagram showing the overall data flow of the system according to the present invention. Detailed Implementation
[0031] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0032] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0033] Example 1: Rectangular Deep Foundation Pit
[0034] The excavation depth was 18.3m, with four layers of concrete support.
[0035] The stress sequence slices output by the construction step deconstruction module are as follows:
[0036] The twin slice reconstruction module constructs a mesh package for S2, inheriting the initial values of the final state of S1:
[0037] S2 step final state three-field actual measurement and simulation comparison:
[0038] Three-field reverse correction module Correct the parameters for the siltation zone ④:
[0039] The step sequence confidence window calculation module calculates S3 as follows:
[0040] S3 Predicts Displacement and Window Boundaries:
[0041] Cascaded early warning module output:
[0042] The response simulation module continues with three steps:
[0043] In this embodiment, the residual norm of the final state in S2 decreased from 12.7 to 9.4 after S3 correction, confirming that the step-limited correction closed loop is effective.
[0044] Example 2: Deep foundation pit in soft soil near the river
[0045] The excavation depth was 19.8m, with three steel supports and pressurized water pressure reduction.
[0046] Step-by-step deconstruction:
[0047] Adaptive soft soil zoning weight coefficients:
[0048] S2 pore pressure residual dominates the correction for permeability coefficient:
[0049] S2 Confidence Window:
[0050] Orange alert triggered:
[0051] Further Scenario Analysis:
[0052] In this embodiment, after the adaptive uplift of the γ weight in the soft soil area, the proportion of the S2 pore pressure residual to the coupling residual increases from 31% to 52%, thus avoiding false alarms due to slight drops in water level.
[0053] Example 3: Reverse Construction Method for Circular Foundation Pit
[0054] It has a diameter of 60m and a depth of 20m, supported by five rings.
[0055] Step-by-step deconstruction (soil sampling and reverse ring forming are combined into a stress-bearing slice):
[0056] Circular symmetry boundary activation command:
[0057] Radial component residuals of equation (1):
[0058] Each step sequence ω:
[0059] Red Alert and Response:
[0060] In this embodiment, the step-by-step slicing under the reverse working condition combines soil sampling and reverse ring forming into the same stress slice. The circular symmetrical boundary reduces the grid size but retains the radial residual.
[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A dynamic simulation and safety early warning system for the entire construction process of deep foundation pits based on digital twins, characterized in that, include: The construction step sequence deconstruction module is used to parse the design drawings, support schemes, dewatering schemes and schedules of the target deep foundation pit project into several construction step sequence slices arranged in chronological order. Each construction step sequence slice carries at least the step sequence number, start and end conditions, excavation depth range, support construction action set, dewatering instruction set and associated structure number. Non-stressed steps containing only measurement or acceptance actions are removed, and the excavation sections between two adjacent support installation actions are merged into the same slice. Each slice is attached with a preceding dependency identifier pointing to the adjacent stressed slice. The twin slice reconstruction module is used to generate a geometric-physical coupled twin in the virtual space based on the step slice output by the construction step sequence deconstruction module. It writes the node displacement vector and Gaussian stress vector of the last state of the previous step as the initial field of the current step mesh package, translates the support action and precipitation action of the current step into the activation instruction set in the mesh package, and extracts intermediate frames at a fixed step size to form a two-layer time tree with the step sequence as the parent axis and the extraction step size as the child axis. The three-field reverse correction module is used to calculate the residuals of the actual displacement field, actual stress field, actual pore water pressure field and the simulation three fields of the current step's twin after each construction step is completed and the actual monitoring data is returned. The three-field coupled residual vector is obtained and the residual vector is projected onto the soil parameter space. The deformation modulus, Poisson's ratio and permeability coefficient of the soil zone to which the current slice belongs are updated using the step-constrained correction method. At the same time, the measured groundwater level and the measured support axial force are used as hard boundaries to cover the original design false boundaries. The step confidence window calculation module is used to extrapolate the final state twin of the current step after back correction to the final state of the next step design, to obtain the predicted displacement field and the predicted stress field, and to calculate the safety margin and half width of the step confidence window in combination with the current step residual decay rate. The cascaded early warning module is used to issue cascaded early warning signals in yellow, orange and red levels when the simulation prediction value of any step exceeds the step confidence window, or the slope of the residuals of two consecutive steps exceeds the coupling convergence limit, or any single field in the three fields goes beyond the step exclusive boundary. The early warning signal carries the step number, the field that went beyond the boundary, the upper and lower edges of the confidence window and the recommended handling level, and automatically blocks the permission bit for the step to switch to the next force step. The disposal simulation module is used to call the twin slice reconstruction module to clone the current step sequence final state sub-body after the cascaded early warning module is triggered, generate three or more disposal scenarios such as adding prestressed support, deepening the operation of dewatering wells, and backfilling back pressure to the previous safe step sequence elevation, continue to push three steps and compare the number of steps required for the safety margin regression of each scenario with the confidence window recovery area, output the disposal suggestion sequence and write back the optimal scenario as a forced insertion step sequence slice; The step sequence traceability module is used to write the initial state field, final state field, residual vector, confidence window parameters, and early warning records of all step sequence slices into an immutable log according to the step sequence number, forming a traceability chain indexed by the step sequence. When design changes or monitoring supplementary tests are performed, only the corrected slices are added without overwriting the historical slices. The step sequence bus is used to connect the above modules with the step sequence number as the key, so that the physical pit, step sequence slice, twin sub-body, and early warning signal are mapped on the same time axis.
2. The dynamic simulation and safety early warning system for the entire deep foundation pit construction process based on digital twins as described in claim 1, characterized in that, The construction step deconstruction module represents each construction step slice as a quadruple. ,in For step sequence numbering, This is the excavation bottom elevation at the end of this step. This refers to the set of support actions performed within this sequence. This is the set of precipitation commands executed within this step sequence; During deconstruction, the current slice's preceding dependency identifier is forced to point to the number of its immediately preceding stressed slice, so that the twin slice reconstruction module inherits the initial displacement and stress values of all previous slice states during reconstruction, regardless of whether the natural clock is continuous.
3. The dynamic simulation and safety early warning system for the entire deep foundation pit construction process based on digital twins as described in claim 1, characterized in that, The twin slice reconstruction module constructs an independent replaceable mesh package for each construction step slice. The mesh package contains soil partition number, support component number, boundary constraint number and contact surface number. When the current step starts, the nodal displacement vector and Gaussian stress vector of the last state of the previous step are written as the initial field of the current grid pack, and the support action and precipitation action of the current step are translated into the activation instruction set within the grid pack. During the step sequence simulation, intermediate frames are extracted at a fixed step size, so that the twins form a two-layer time tree with the step sequence as the parent axis and the extraction step size as the child axis, which is used by the three-field back correction module for frame comparison.
4. The dynamic simulation and safety early warning system for the entire deep foundation pit construction process based on digital twins as described in claim 2, characterized in that, The three-field reverse correction module performs the following operations: Let the current step sequence be... The actual monitoring data returned after the completion of the transmission forms a displacement vector. Stress vector pore pressure vector The final state of the current step sequence simulation is formed. , , Define the three-field coupled residual vector in The weighting coefficients are adaptively determined based on the spatial density of monitoring points and satisfy the following conditions: ; Will Projecting onto the soil parameter space, the deformation modulus of the soil zone to which the current slice belongs is updated using the step-constrained correction method. Poisson's ratio Permeability coefficient This makes the norm of the final state residual in the next simultaneous partitioning step simulation... Less than this step sequence ; The measured groundwater level and measured support axial force are used as hard boundaries in the boundary condition matrix to cover the original design false boundaries.
5. The dynamic simulation and safety early warning system for the entire deep foundation pit construction process based on digital twins as described in claim 1, characterized in that, The step confidence window calculation module is configured to extrapolate the current step's final state twin after backcorrection to the next step. The final state of the design is used to obtain the predicted displacement. With predicted stress ; Calculate the residual decay rate of the current step sequence. ; Define the step confidence half-width: in The initial window width, , For calibration constants, This represents the number of valid monitoring points in this step sequence. This represents the theoretical number of points to be placed in this step sequence; Next-order safety margin vector ,when or When a plane falls into a prohibited area, it is considered to be outside the window and out of bounds.
6. The dynamic simulation and safety early warning system for the entire deep foundation pit construction process based on digital twins as described in claim 1, characterized in that, The cascaded early warning module specifically executes the following: Yellow level: Single-step predicted displacement exceeds the step confidence window but does not continuously cross the limit, or residual decay rate. ; Orange level: Two consecutive steps Furthermore, the slope increases, or one of the three games exceeds the step sequence boundary but the other game does not; Red Level: Safety Margin for Next Step Or, the simulated axial force exceeds 0.9 times the component's limit, or the predicted bottom heave is greater than the excavation depth. ; The cascaded signal carries the step sequence number, the field of the out-of-bounds boundary, the upper and lower edges of the confidence window, the recommended handling level, and automatically blocks the permission bit for the step sequence to switch to the next force-bearing step sequence.
7. The dynamic simulation and safety early warning system for the entire deep foundation pit construction process based on digital twins as described in claim 1, characterized in that, The disposal simulation module is configured as follows: Under a red or orange alert, at least three handling scenarios are generated, including adding prestressed supports, deepening the operation of dewatering wells, and backfilling and counter-pressurizing to the previous safe step elevation. In each scenario, the current step's final state sub-body is cloned in the twin slice reconstruction module, and scenario actions are applied, continuing for three steps; Comparing the results of the follow-up projections for each scenario, the safety margin regression was... The required number of steps and the confidence window recovery area are sorted by recovery efficiency, and the output processing suggestion sequence is sorted. The optimal scenario is written back to the step sequence bus as a forced insertion step sequence slice.
8. The dynamic simulation and safety early warning system for the entire deep foundation pit construction process based on digital twins as described in claim 1, characterized in that, It also includes a step sequence tracing module, which is used to write the initial state field, final state field, residual vector, confidence window parameters, and early warning records of all step sequence slices into an immutable log according to the step sequence number, forming a tracing chain indexed by the step sequence; When any step is modified in design or supplemented by monitoring, only the correction slice is allowed to be added at the end of the traceability chain. Overwriting the historical slice is prohibited, so that the three-track synchronous screen of physical foundation pit - twin body - early warning judgment can be played back at any time.
9. The dynamic simulation and safety early warning system for the entire deep foundation pit construction process based on digital twins as described in claim 1, characterized in that, The system uses the construction sequence as the sole time axis, replacing the monitoring flow which is based on the natural clock. Before entering the three-field reverse correction module, the sensor data stream of the physical foundation pit is first stamped by the construction step sequence deconstruction module, so that the gap period data that does not belong to any force-bearing step sequence does not participate in the residual calculation, but is only stored in the step sequence gap cache as a twin static relaxation term.