645 results about "Deep excavation" patented technology

The invention discloses a deep foundation pit stability deformation control method and device based on digital twinning. The method comprises the steps that monitoring time sequence data of a deep foundation pit are collected and obtained; constructing a deep foundation pit deformation control digital twin platform; constructing a CNN-LSTM composite neural network based on an Adam optimization algorithm through a foundation pit deformation prediction module, and performing model training / verification on the CNN-LSTM composite neural network through the data training set and the data verification set to obtain an optimized CNN-LSTM composite neural network; based on the optimized CNN-LSTM composite neural network, performing time sequence change prediction on the axial force of the steel support according to the data test set to obtain a prediction result; the steel support servo module realizes servo control on the axial force of the steel support according to a prediction result on the basis of a constructed servo control strategy; and the foundation pit BIM module is used for constructing a deep foundation pit BIM model based on a Revit modeling technology and interacting with the deep foundation pit BIM model in real time through a RevitAPI data interface according to the output of the steel support servo module so as to realize visualization of deformation control of the deep foundation pit. The problems that in the deep foundation pit construction process, due to the fact that complex geological conditions are involved, the surrounding environment and an existing building are affected to a certain degree, and deformation and stability of the deep foundation pit cannot be accurately controlled are solved.

The invention relates to the technical field of data processing, and discloses a soil pressure analysis method and system for a subway double-side extension foundation pit enclosure structure, and the method comprises the steps: carrying out the multi-point soil pressure monitoring of the periphery of extension deep foundation pits at two sides of a subway station, and obtaining the original soil stress data; performing process defect influence elimination and geological condition correction on the original soil stress data to obtain corrected soil pressure distribution data, and performing space-time coupling analysis to obtain soil pressure evolution characteristics; performing characteristic analysis and support parameter optimization on the soil pressure evolution characteristics to obtain a soil pressure prediction result in the dynamic construction process; performing normal use and limit working condition simulation on the soil pressure prediction result to obtain a soil pressure change rule under different excavation conditions; and carrying out retaining structure stress analysis and settlement influence evaluation on the soil pressure change rule to obtain safety evaluation data of the retaining structure. According to the method, the efficiency and accuracy of analyzing the soil pressure of the subway double-side extension foundation pit support structure are improved.

The invention relates to the technical field of design analysis, in particular to a soft soil deep foundation pit earth excavation construction scheme planning method and system.The soft soil deep foundation pit earth excavation construction scheme planning method comprises the following steps that a three-dimensional geological model is built based on geological exploration data, and rheological parameters, shear strength parameters and permeability coefficients of all soil layers are extracted to serve as layering parameters; according to the layering parameters and preset supporting structure rigidity parameters, a soil body rheological rate compensation coefficient is calculated, and an earthwork block excavation scheme with the grading thickness difference is generated; and in the excavation process, the displacement rate and pore water pressure data of the supporting structure are collected in real time, and when a monitoring value exceeds a preset threshold value, a dynamic adjustment instruction of the block excavation scheme is triggered. According to the method, the layering thickness and the blocking form are intelligently controlled according to different sensitivity levels, the matching coping capacity for soft soil instability inducements is improved, and the limitation that a single physical parameter dominates in traditional blocking design is broken through.

The invention relates to the technical field of horizontal directional drilling monitoring, and particularly discloses a horizontal directional drilling track real-time dynamic monitoring system which comprises a drilling data acquisition module, a self-adaptive data transmission module, a geological layer analysis module, a three-dimensional track monitoring module and an automatic control module. According to the invention, the geological layer analysis module applies an advanced intelligent analysis technology to carry out deep excavation and accurate identification on dynamic data, and the converted drilling data is further converted into a three-dimensional trajectory diagram, so that an operator of a ground control center can master the full view of the drilling operation in real time, the visual monitoring of the operation process is realized, and the working efficiency is improved. The automatic control module fuses a deep learning algorithm, can intelligently identify route deviation or abnormal conditions in the three-dimensional trajectory diagram, quickly generates a visual adjustment instruction, can find and correct potential problems in the first time, and effectively avoids operation delay or resource waste caused by factors such as trajectory deviation.

The invention belongs to the field of intelligent construction, and discloses a deep foundation pit displacement prediction method combining finite element and data driving, which comprises the following steps: calculating a theoretical elastic modulus according to an investigation report, and constructing a sample space by adopting a Latin hypercube sampling method and an orthogonal experiment design method; a proper constitutive model is selected, and corresponding lateral displacement is calculated through finite elements; dimensionality reduction processing is carried out on the data set based on global sensitivity analysis of variance so as to accelerate convergence during subsequent inversion; training an SKRR-LSBOOST model through an ensemble learning method to replace a traditional model; combining an improved Hemma optimization algorithm with a substitution model, and applying the combined model to parameter inversion; and performing forward analysis based on the finite element model defined by the inversion parameters to predict the deformation of the deep foundation pit in the next excavation stage. According to the method, the advantages of numerical simulation and data driving are fully exerted, the calculation cost is reduced according to the rock and soil parameters, higher prediction precision is achieved, and the accuracy of foundation pit deformation prediction is improved.

The invention discloses a deep foundation pit excavation deformation real-time monitoring system based on relative measurement. The deep foundation pit excavation deformation real-time monitoring system comprises a relative measurement sensor group, a data acquisition and preprocessing module, a wireless data transmission module, a cloud data processing and analysis module, an intelligent risk assessment module, a visual alarm module and a solar power supply and energy storage management module. The relative measurement sensor group collects deformation data of the deep foundation pit, the data acquisition and preprocessing module performs primary processing on the data, the wireless data transmission module stably transmits the data to the cloud, the cloud data processing and analysis module performs deformation prediction, and the intelligent risk assessment module performs risk grading. The visual alarm module gives an alarm in real time and carries out emergency notification according to different risk levels, and the solar power supply and energy storage management module guarantees continuous operation of the system. The system solves the problems of measurement precision, data transmission, risk assessment, power supply stability and the like of an existing monitoring system, provides powerful support for safe construction of the deep foundation pit, and has remarkable benefits.

The invention relates to the technical field of safety monitoring of deep foundation pit construction adjacent to railways, and particularly discloses a safety monitoring device and method for deep foundation pit construction adjacent to railways. The system comprises a supporting structure safety analysis module, a settlement risk analysis module, a train passing construction safety evaluation module, a geological level risk evaluation module, a displacement level risk evaluation module, a database and a construction process construction safety evaluation module. Whether the construction of the deep foundation pit is safe or not is analyzed from the two levels of the safety change condition of the deep foundation pit when a train passes and the safety change condition of the deep foundation pit in the long-term construction process, that is, the deep foundation pit risk is automatically monitored from the four levels of the foundation pit supporting structure, the rail settlement risk, the foundation pit geology and the foundation pit displacement; the method avoids neglecting the instant safety risk, helps to evaluate the instant influence on railway facilities, and can grasp the overall safety trend, thereby helping to adjust the construction strategy and maintenance measures in time.

The invention discloses a settlement amount time sequence prediction method and system for deep foundation pit excavation adjacent buildings. The method comprises the steps that original monitoring data of on-site building settlement are acquired; performing data preprocessing on the obtained original monitoring data; constructing a recurrent neural network; model input and output parameters are determined through principal component analysis; optimizing the recurrent neural network based on an optimizer; performing hyper-parameter optimization based on an optimization result; performing settlement time sequence prediction by using the optimized recurrent neural network; the system comprises a data acquisition module, a preprocessing module, a model construction module, an analysis module, an optimization module, a parameter optimization module and a prediction module. By constructing the settlement prediction model, dynamic modeling and accurate prediction of the settlement trend of the building in the excavation process of each stage of the foundation pit are realized; historical settlement monitoring data and multi-layer soil body excavation information are combined, and multi-source input parameters are introduced, so that the adaptability of the model to complex working conditions is enhanced.

The invention relates to the technical field of deformation prediction, in particular to a lateral deformation prediction system and method based on a deep foundation pit wall body, and the system comprises a deformation data collection module which collects a ground surface settlement monitoring value and a lateral displacement monitoring value of a corresponding measuring point of the deep foundation pit wall body, carries out the time sequence alignment processing of data points, removes an abnormal monitoring value, and obtains a deformation data collection module; and establishing calibration deformation sequence data. According to the invention, through real-time acquisition and strict execution of data time sequence alignment processing, the consistency of ground surface settlement data and wall lateral displacement data is ensured, abnormal monitoring data is effectively eliminated, and the data accuracy and consistency are improved; in the spatial interpolation process, width measurement of a settlement area is introduced, the width characteristic of a settlement groove is determined, and the earth surface deformation trend is captured according to a deformation index; and extracting the maximum lateral displacement of each time section of the monitoring section, establishing a dynamic corresponding relation between the maximum displacement and the width of the settling tank, and identifying the regular influence of the change of the construction process on the lateral deformation.

The invention relates to the technical field of deep foundation pit settlement survey, in particular to a deep foundation pit settlement monitoring method, system and device for geotechnical engineering.The method comprises the steps that a deep foundation pit settlement abnormal area and the intersection time period of settlement value continuous increasing time periods of any two deep foundation pit key monitoring points in the deep foundation pit settlement abnormal area are obtained; and the settlement uniformity degree of any two key monitoring points of the deep foundation pit is obtained based on the intersection time period, so that the settlement risk degree of the abnormal settlement area of the deep foundation pit is obtained, and the overall settlement degree of the deep foundation pit is obtained according to the settlement risk degree of each abnormal settlement area of the deep foundation pit, so that the accuracy of the overall settlement degree of the deep foundation pit is improved; and risk assessment is carried out on the deep foundation pit according to the overall settlement degree of the deep foundation pit, and finally the accuracy of the risk assessment result of the deep foundation pit is improved.

The invention relates to the technical field of settlement monitoring, in particular to a method for reducing differential settlement monitoring errors of a deep foundation pit, and the method comprises the steps: measuring the three-dimensional coordinate information of each monitoring point in the range of the deep foundation pit; according to the synchronization characteristic of random fluctuation of the three-dimensional coordinate information of each monitoring point in each time period, the interfered synchronization degree of each monitoring point in each time period is obtained, and according to the change characteristic of the interfered synchronization degree of each monitoring point in all time periods, the synchronous interference continuity of each monitoring point is obtained; according to the average level and the difference degree of the interference synchronization degrees of different monitoring points in the local area, the interference significant coefficient of each monitoring point is obtained, and the settlement credibility of each monitoring point is obtained by combining the synchronization interference persistence so as to extract a settlement point; and monitoring the differential settlement of the deep foundation pit according to the coordinate distribution difference condition of each settlement point in the vertical direction. The settlement monitoring precision can be improved.

The utility model relates to the related technical field of inclination measuring devices, in particular to a deep foundation pit excavation deformation real-time monitoring device which comprises a bottom plate. A portal frame is fixedly connected to the top of the bottom plate, a through hole is formed in the bottom plate, a circular plate is arranged in the through hole, a plurality of expansion plates are arranged at the bottom of the circular plate, and the expansion plates are all slidably connected with the circular plate. Under the cooperative action of the portal frame, the through hole, the circular plate, the expansion plate, the protection mechanism and the lifting mechanism, the device supports the inner wall of the deep foundation pit while detecting the deformation condition of the inner wall of the deep foundation pit, the situation that the inner wall of the deep foundation pit collapses due to deformation is avoided, and the working efficiency of the deep foundation pit is improved. The problem that an existing deep foundation pit excavation deformation real-time monitoring device does not have the function of supporting the inner wall of a deep foundation pit, and consequently collapse easily occurs after the inner wall of the deep foundation pit deforms is solved.

The invention discloses a double-row steel sheet pile and soil core combined cofferdam structure and a construction method. The double-row steel sheet pile and soil core combined cofferdam structure comprises double-row pile connecting units, steel sheet piles, brackets, steel enclosing purlins, dredger fill and drainage plates. Each double-row pile connecting unit is formed by welding an upper connecting plate between two connecting steel sheet piles; the double-row pile connecting units are inserted into a soil body, and a steel sheet pile is inserted between every two double-row pile connecting units; corbels are welded to the outer sides of the steel sheet piles, steel enclosing purlins are arranged on the corbels, and the steel enclosing purlins, the steel sheet piles and the corbels are connected in a welded mode; dredger fill is filled between the two rows of steel sheet piles and is compacted by a hammer-attached soil squeezer; a drainage plate is inserted into the dredger fill; earth excavation is conducted on the side, close to water, of the double-row pile cofferdam to form a foundation pit; when shallow excavation is conducted on the foundation pit, no sand filling pipe bag is arranged; when the foundation pit is deeply excavated, a slope section is reserved; sand filling pipe bags are arranged on the outer side of the slope section and stacked on the outer side of the slope section in a staggered mode. The hammer-attached soil squeezing device comprises an attached hammer, a pressing plate, water permeable holes, geotechnical cloth and a brush.

The invention provides a dynamic risk prediction and optimization decision-making method and system for a deep foundation pit construction process. A deep foundation pit numerical simulation model is established, and the model is used for simulating soil mechanical behaviors and supporting system response parameters in the construction process; acquiring multi-dimensional real-time monitoring data of the foundation pit, comparing the monitoring data with a numerical simulation result, and calibrating parameters of the deep foundation pit numerical simulation model according to a comparison result; performing time series data modeling analysis on the real-time monitoring data by using a Transform algorithm, capturing possible risk modes in the construction process, and identifying potential risk signals in the data; on the basis of Transform algorithm analysis and numerical simulation feedback results, the foundation pit construction risk state is predicted in real time, and a real-time risk prediction result is obtained; and according to the prediction result, dynamically adjusting the construction scheme to complete decision optimization. According to the method, the risk management and control capability of the deep foundation pit construction process is remarkably improved, and the construction safety and efficiency are greatly improved.

The invention relates to the technical field of foundation pit drainage, and provides a deep foundation pit drainage system and a use method.The method comprises the steps that a1, an annular dewatering well is arranged on the periphery of a deep foundation pit, and underground water is collected and lowered through the annular dewatering well; a2, a drainage network in the foundation pit is established to eliminate surface rainfall and seepage water; a3, based on a preset water level control strategy, a drainage pumping device is started to drain the collected underground water away from the foundation pit; a4, hydrological changes inside and outside the deep foundation pit are monitored, and operation parameters of the dewatering well and the drainage system are adjusted in time so that the safe water level state in the deep foundation pit can be maintained; through the scheme of the embodiment of the invention, the problem of how to effectively prevent underground water from seeping into the foundation pit in a high-water-level area by the deep foundation pit drainage system can be solved.

The invention relates to the field of safety supervision, and particularly discloses a deep foundation pit construction quality safety supervision system and method. Firstly, a pithead image, collected by a camera, of a deep foundation pit construction site, deep foundation pit side wall soil layer inclination displacement measurement text data collected by an inclinometer and underground water level values, collected by an underground water level monitoring device, at a plurality of preset time points are obtained, then feature extraction and correlation analysis are conducted on the three parts through the deep learning technology, and the deep foundation pit side wall soil layer inclination displacement measurement text data and the underground water level values are obtained. And finally, a classification result is obtained through a classifier to judge whether a deep foundation pit construction quality safety early warning is sent out or not, so that potential safety hazards are found in time, early warning is carried out in advance, and smooth proceeding and safety of engineering construction are guaranteed.

The utility model belongs to the technical field of foundation engineering, particularly relates to a foundation engineering deep foundation pit supporting device, and aims to solve the problems that the supporting range is small and the danger coefficient is high in the background technology, and provides the following scheme that the foundation engineering deep foundation pit supporting device comprises supporting plates which are symmetrically distributed, and hinged plates which are symmetrically distributed are welded to the outer walls of one sides of the two supporting plates; and an internal thread sleeve is hinged between the two hinged plates. The two supporting plates can be specially used for supporting the inner wall of the foundation pit, so that the supporting plates can be attached to the inner wall of the foundation pit in the foundation pits with different widths and sizes, the supporting effect is remarkable, the supporting range is greatly widened, the butt joint structure is arranged on each supporting plate, and the supporting effect is good. The positioning blocks in the bottom frame of the upper-layer supporting plate can be directly connected into the top frame of the lower-layer supporting plate in a butt joint mode, the upper supporting plate and the lower supporting plate are connected and fixed, the supporting device can be used for the field of supporting of deep foundation pits, use is flexible, collapse of rock soil on the upper layer is avoided, and the safety coefficient is high.

The invention discloses a deep foundation pit stability monitoring method, and relates to the technical field of deep foundation pit monitoring, and the method comprises the steps: carrying out the data monitoring of the geological information and interference factors of a deep foundation pit, preliminarily evaluating the stability of the deep foundation pit and the influence factors of the deep foundation pit, carrying out the prediction evaluation of the stability of the deep foundation pit, and carrying out the maintenance management operation. According to the method, the stability of the deep foundation pit is comprehensively evaluated from the displacement risk, stress risk and water pressure risk of the deep foundation pit, the comprehensiveness of data fusion processing is guaranteed, the influence conditions of rainwater factors, temperature factors and vibration factors on the stability of the deep foundation pit are monitored, and therefore the influence degree of interference factors on the stability of the deep foundation pit is analyzed; according to the method and the system, the interference factors are monitored to generate corresponding early warning prompt signals for processing, and the influence of the interference factors on the stability of the deep foundation pit is monitored, so that early warning and corresponding maintenance management on the stability of the deep foundation pit are realized, the anti-interference capability of the deep foundation pit is improved, the timeliness of stability monitoring management is realized, and the continuous stability of the deep foundation pit is further ensured.

The invention relates to the technical field of foundation pit engineering safety monitoring, in particular to a deep foundation pit deformation early warning method and system. The method comprises the following steps: acquiring displacement settlement data of the deep foundation pit through monitoring equipment; constructing a bearing capacity correction model, and obtaining a bearing capacity correction factor of the supporting structure according to the bearing capacity correction model; according to the soil body characteristics of the deep foundation pit soil body, the anti-sliding stability of the deep foundation pit soil body is analyzed; based on the seepage characteristics of the deep foundation pit, seepage influence factors of the deep foundation pit are calculated; and in combination with the bearing capacity correction factor, the anti-sliding stability and the seepage influence factor, the displacement settlement data are corrected, and deformation early warning of the deep foundation pit is completed through the corrected displacement settlement data. According to the method, the monitored displacement settlement data is corrected according to the actual conditions of the deep foundation pit, then deformation early warning is performed, the method can adapt to different geological conditions, construction stages and environmental factors, and the problem of efficiently and accurately performing early warning on deformation of the foundation pit is solved.

The invention relates to a deep foundation pit lateral displacement calculation method and device, electronic equipment, a medium and a program product. The method comprises the steps that a complete foundation pit BIM model is established based on a BIM family model of each foundation pit engineering component; based on the foundation pit BIM model, determining a calculation model under each excavation step, and based on the calculation model under each excavation step, obtaining a node load matrix under the corresponding excavation step and a stiffness matrix under the corresponding excavation step; and on the basis of the node load matrix under each excavation step and the rigidity matrix under each excavation step, the deformation increment of the supporting structure under each excavation step is obtained, the deformation increments of the supporting structures under each excavation step are overlapped in sequence, and foundation pit supporting deformation under each excavation step is obtained. Therefore, the problems that a full-model finite element analysis mode adopted in the prior art is high in calculation cost and low in efficiency are solved, and the convenience and accuracy of foundation pit lateral displacement deformation prediction work are greatly improved.

The invention discloses an ultra-deep foundation pit supporting system selecting and monitoring method based on the digital technology, and belongs to the technical field of building construction.By inputting the specification, the geological condition, the hydrological condition and the load condition of a foundation pit into a foundation pit supporting system, a supporting system result meeting the specification is calculated and output; a complete three-dimensional foundation pit supporting system model is rapidly created in combination with Dynamo and Revit, a supporting structure construction drawing is output, and a material list and a calculation report of a supporting structure are generated; then, construction is conducted; the foundation pit supporting system model is imported into the monitoring platform, monitoring data of the foundation pit supporting system are obtained and mapped into the foundation pit supporting system model, and the current foundation pit supporting deformation condition can be visually analyzed; a data resource library is established in the monitoring platform, the monitoring data is compared with the data resource library, and the future foundation pit deformation condition is predicted; and the monitoring platform is connected with an alarm device, and when the monitoring data reaches a threshold value or the predicted deformation condition reaches the threshold value, the alarm device starts to report early warning information.

The invention discloses an anti-seismic construction device for an ultrahigh-strength concrete pipe pile. The anti-seismic construction device comprises a supporting frame mechanism, a pile grooving mechanism and a pipe pile sinking mechanism. The support frame mechanism comprises a bottom support frame, a vertical support steel plate and a top steel plate; the pile grooving mechanism comprises a grooving rod assembly, a rod rotating assembly, a mounting assembly of the rod rotating assembly and a lifting assembly. The pipe pile sinking mechanism comprises an impact block, a block movable limiting rod and an impact block hoisting assembly. The construction method comprises the following steps that 1, firstly, the pile grooving mechanism is used for deeply digging and grooving; 2, sinking the pipe pile section by section by using a pipe pile sinking mechanism, and impacting to sink; 3, a reinforcement cage is arranged below, concrete grout is injected, and solidification is waited; soil is extruded into the soil retaining barrel, the soil is convenient to pull out, deep excavation is not prone to deviation, the tubular pile can permeate concrete to the outside, the multiple protrusions are formed on the outer wall of the tubular pile, friction between the tubular pile and the soil is easily increased, and the tubular pile is not prone to falling down.

The invention relates to a mountainous area road deep excavation roadbed slope monitoring method, system and terminal, and belongs to the technical field of slope monitoring, the monitoring method comprises the following steps: according to slope data of a monitoring slope needing to be monitored, gridding the monitoring slope; obtaining a change temperature difference of each grid; the grids with the change temperature difference not smaller than a set temperature difference threshold value are screened out and marked as water seepage grids; marking a seepage path according to the screened water seepage grids; obtaining the grade of a seepage area through which the seepage path flows; if the grade of the permeation area is a high permeation area, executing a first-grade early warning strategy; if the grade of the permeation area is a low permeation area, executing a secondary early warning strategy; and if the grade of the permeation area comprises both the high permeation area and the low permeation area, executing a three-level early warning strategy. The method has the beneficial effects that the damage of slope disasters caused by rainfall to the road is effectively avoided or reduced, and the traffic safety of the road is guaranteed.

The invention discloses a construction method for constructing a deep foundation pit by using an existing structure, and relates to the technical field of foundation pit construction.The construction method comprises the steps that the existing enclosure structure is positioned, a crown beam of the existing enclosure structure is chiseled away after excavation, and a fender post design scheme is confirmed; small-diameter secant piles are constructed according to the fender post design scheme, and a newly-built fender post is formed; the joint of the newly-built enclosure structure and the existing enclosure structure is reinforced; the crown beam is constructed, and the newly-built enclosure structure and the existing enclosure structure are connected; according to the excavation process, the defect position of the enclosure structure is reinforced; establishing and training a correlation model based on the water level data and the deformation data to obtain a water level deformation correlation model; and according to the real-time water level change, performing defect prediction and early warning on the enclosure structure in combination with the water level deformation correlation model, and reinforcing the defects of the enclosure structure. According to the method, the occupied area of the enclosure structure is reduced, the existing enclosure piles are repaired, and the defects of the enclosure structure can be accurately found and reinforced.

The invention relates to the technical field of deep foundation pit monitoring, and discloses a deep foundation pit micro-deformation InSAR remote sensing method and system and a storage medium. The method comprises the following steps: synchronously acquiring data through a ground radar and an InSAR satellite, and obtaining a point target set and an original scattering characteristic sequence; obtaining a net deformation phase sequence without influence through registration residual correction, phase deduction and weighted fusion processing, and carrying out phase consistency quality control and unwrapping processing to obtain an accumulated deformation quantity sequence; constructing a deformation mechanism correlation characteristic matrix based on correlation analysis of the cumulative deformation quantity sequence and radar reflection intensity amplitude attenuation characteristics; and fusing the deformation mechanism correlation feature matrix and the real-time differential interference image group, extracting deformation rate and phase gradient change, and further generating a deep foundation pit local micro-deformation risk early warning index set. According to the invention, the tiny deformation of the surrounding area of the foundation pit can be effectively detected, potential risks are warned in advance, and the safety and monitoring efficiency in the construction process are improved.

The invention relates to a water-rich soft soil stratum deep foundation pit dewatering excavation coupling analysis method. The method comprises the steps that an SOIL module on a large-scale commercial finite element software ABAQUS calculation platform is used, a Biot consolidation control equation is adopted to describe the coupling effect of soft soil stress-pore unsteady flow under foundation pit dewatering excavation, a finite element model is established, and in combination with field monitoring experience of foundation pit excavation construction on an adjacent environment influence range, an in-pit dewatering mode is adopted to determine the soft soil stress-pore unsteady flow coupling effect under foundation pit dewatering excavation. The calculation time and the calculation precision are comprehensively considered, and step-by-step refined simulation in the foundation pit construction process is achieved. According to the method, the fluid-solid coupling effect in the dewatering excavation process of the deep foundation pit in the water-rich soft soil stratum can be accurately simulated, the influence of foundation pit excavation on the surrounding environment is effectively predicted, and the engineering safety and reliability are improved.

The invention discloses a deep foundation pit supporting system in a silt soft soil layer environment and a construction method. The construction method comprises the following steps that construction preparation is conducted; construction scheme design and feasibility evaluation: compiling a construction scheme, and evaluating whether the stability of the deep foundation pit supporting system meets the requirement or not; design and construction of silt soft soil support reinforcement: designing a structure for supporting and reinforcing silt soft soil, and constructing a steel sheet pile enclosure wall, an out-pit cement mixing pile enclosure wall and an in-pit cement mixing pile enclosure wall; earth excavation and inner support construction in the foundation pit are conducted, specifically, earth excavation is conducted, and a steel pipe inner support is adopted for supporting; and in-pit construction and supporting system conversion, bottom sealing concrete is poured at the pit bottom of the deep foundation pit, bearing platform pouring is carried out on the bottom sealing concrete, and in the pouring process, a steel pipe inner support is dismantled. According to the method, the rigidity of a deep foundation pit supporting system can be effectively enhanced, underground water permeation is prevented, and the weight of a foundation pit bottom sealing component is increased so as to prevent the foundation pit bottom silt soft soil body from upheaval and water burst accidents.

The invention discloses an accurate control method for micro-deformation of a deep foundation pit. The method comprises the steps that a first concrete support is constructed between foundation pit support structures; the method comprises the following steps: sequentially constructing subsequent concrete supports between a foundation pit support structure along with excavation of a soil body of a foundation pit, and mounting an active servo control device between each concrete support of the subsequent concrete supports and the foundation pit support structure, grouting reinforcement is carried out on the soil body in the pit which is not excavated below the two ends of each concrete support of each subsequent concrete support; according to a formula (1), micro-deformation of the foundation pit support structure generated in the foundation pit excavation process is accurately controlled through a cooperative control mode of active compensation of servo supporting force applied by the active servo control device and passive compensation of grouting reinforcement of soil in the pit. Micro-deformation generated in the excavation process of the foundation pit can be accurately controlled, the construction safety of the foundation pit is effectively guaranteed, and the dynamic intelligent regulation and control effect on the micro-deformation of the foundation pit is achieved.

The invention relates to the field of building construction, in particular to a deep foundation pit construction intelligent monitoring and early warning method based on multi-source characteristic parameter fusion, and constructs a comprehensive foundation pit intelligent monitoring and early warning index system by fusing multi-source characteristic parameters including deformation characteristics, mechanical characteristics and technical characteristics. By means of the combination of a one-dimensional convolutional neural network (1DCNN) and a support vector machine (SVM), complex feature information in foundation pit deformation monitoring data can be deeply excavated and extracted, compared with a traditional prediction method depending on a single feature or a simple model, the foundation pit deformation prediction precision is remarkably improved, and the foundation pit deformation prediction method has the advantages of being high in practicability and the like. And comprehensive monitoring and accurate early warning of the construction process are ensured.

The invention is suitable for the technical field of foundation pit monitoring, and relates to an intelligent monitoring and early warning method and system for a deep foundation pit, and the method comprises the steps: carrying out the real-time dynamic correction of a pre-constructed foundation pit construction whole process refined three-dimensional numerical model through the precise application of field monitoring data, and generating a highly accurate corrected numerical model; a data prediction result obtained based on the correction model not only contains various possible changes in the foundation pit construction process, but also accurately reflects the influence of construction conditions on the stability of the foundation pit, so that continuous and efficient monitoring and early warning of the state of the foundation pit can be realized, and tight combination and efficient cooperation of site construction and foundation pit monitoring are ensured; therefore, the intelligent monitoring and early warning method and system for the deep foundation pit provide reliable technical support and decision basis for safety assessment of the foundation pit, and the safety of foundation pit construction is greatly improved.