499 results about "Deep excavation" patented technology

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 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 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 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 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 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 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 a method for comprehensively judging water leakage of a deep foundation pit through multi-parameter coupling, and belongs to the technical field of foundation pit water leakage monitoring. The method comprises the following steps that in a deep foundation pit support structure, an observation well and a dewatering well are arranged on the periphery, primary and secondary monitoring sections are arranged, and the underground water level is monitored in real time; in the rainfall process, the automatic collecting device records the change of the underground water level outside the pit, and if the change of the water level does not exceed 0.5 m, it is considered that no leakage point exists; if the length exceeds 0.5 m, judging that a potential leakage point exists, calculating the horizontal flow velocity of underground water, and determining a leakage zone; and further putting a tracer into the observation well with abnormal flow velocity, measuring conductivity, temperature and water level data, analyzing the data, judging whether abnormity occurs or not, and calculating the flow velocity of the underground water, so that the leakage position of the foundation pit support structure and the flowing direction of the underground water are accurately determined. According to the invention, misjudgment caused by faults or errors of a single sensor can be reduced, and the reliability and precision of leakage point positioning are improved.

According to the method for effectively removing the spartina alterniflora, deep digging and layered inverted burying are conducted on the spartina alterniflora in a treatment area, it is ensured that overground parts and shallow surface plants are all integrally inverted and buried in soil which is 140 cm or below away from the ground, the plants are isolated from light and air, and the effect of removing the spartina alterniflora is achieved. Then the underground part is integrally inversely buried above the inversely buried overground part, the overground part is thoroughly covered, deep isolation is ensured, the regeneration capacity of the overground part is fundamentally blocked, and thorough deep digging and layered inversely buried burying of the spartina alterniflora in the whole treatment area are sequentially and progressively completed. The method does not need to use chemical agents, is environmentally friendly, easy and convenient to operate, high in durability and suitable for ecological management of large-area beach wetlands, effectively restrains rejuvenation of spartina alterniflora and maintains ecological balance.

The invention discloses a foundation pit seepage-deformation space-time coupling early warning method and system based on a large geological model, and belongs to the technical field of geotechnical engineering intelligent monitoring, and the method comprises the steps: processing a regional geological survey report through the large geological model based on a Transform architecture, and generating a high-precision three-dimensional stratum parameter field; further, an improved particle finite element method is adopted to carry out dynamic coupling solution of a seepage field and a stress field, a displacement rate vector is obtained, a hybrid network space-time prediction model fused with LSTM-Transform is constructed, a composite early warning index is calculated in combination with the real-time displacement rate vector, and through multi-source data fusion and space-time coupling analysis, an early warning result is obtained. Accurate evaluation and advanced early warning of the seepage stability and the deformation state of the deep foundation pit project are achieved, the accuracy and reliability of early warning signals are remarkably improved, and the method is suitable for foundation pit safety control under complex geological conditions.

The invention relates to a large-digging-depth earth cutting component ground breaking judgment method and system based on gravel. The method comprises the following steps that firstly, the angle to the ground, the horizontal precession distance and the vertical earth cutting thickness of a rotating shaft of an excavator tool are obtained; 2, three-dimensional coordinates and three-direction plane angles of the earth cutting component on the excavator tool are obtained; 3, obtaining a homogenized sequence of the earth cutting components on the excavator tool; fourthly, a first feature component is determined according to the angle to the ground, and the first feature component is an earth cutting component located at the deepest excavation position; 5, performing sequence intersection test according to the horizontal precession distance to obtain the equivalent depth and the critical depth of the earth cutting component; sixthly, the ground breaking state of the earth cutting component within the vertical earth cutting thickness range is judged. The method has the advantages of being simple, accurate and efficient in positioning, low in cost, economical, practical, wide in application range and the like.

The invention belongs to the technical field of geotechnical engineering precision monitoring and calculation intelligent crossing, and discloses a deep foundation pit support pile micro-deformation capturing and predicting method and system fusing physical mechanism constraints, and the method comprises the following steps: obtaining and fusing a static physical field and a dynamic displacement field of a deep foundation pit support pile; constructing an enhanced space-time field atlas containing physical boundary conditions; constructing a micro-deformation prediction model, constructing a physical information loss function based on a support pile beam unit fourth-order differential equation, and training the micro-deformation prediction model based on the physical information loss function to obtain a trained model; and inputting the enhanced time-space field atlas into the trained model, extracting spatial morphological characteristics of pile body micro-strain in the enhanced time-space field atlas, and obtaining a support pile deformation prediction result. According to the method, the technical bottleneck of'micro-feature annihilation 'of a general model is broken through, and high-fidelity capture of micron-sized deformation is realized.

The invention relates to a synchronous removal deep foundation pit for deeply burying large waste rafts in a sensitive environment and a construction method. Comprising a prefabricated assembly type trestle plate step-by-step reinforced concrete supporting trestle technical system, a steel casing and rapid prefabricated assembly type water collecting pit setting technical system, a waste bottom plate block-by-block breaking-first-cutting-crushing-dismantling technical system and a reserved pile filling hole position segment-by-segment block-by-layer backfilling technical system. The construction method has the beneficial effects that rapid construction of the reinforced concrete supporting trestle is achieved, the structural stability is guaranteed, and the construction efficiency is improved; high efficiency and quality control of construction of the stand column pile are achieved, meanwhile, the concrete over-filling amount is reduced, and the construction economical efficiency is improved; rapid setting and automatic management of the sump are realized, and the construction efficiency and the reliability of a drainage system are effectively improved; safe and efficient dismantling of the waste bottom plate is achieved, the construction precision is guaranteed, and the operation efficiency is improved.

The invention belongs to the technical field of building construction, and discloses an ultra-deep foundation pit supporting device and a construction method.The supporting device comprises supporting assemblies, a lifting assembly and a control assembly, at least two sets of supporting assemblies are arranged at intervals in the depth direction of a foundation pit, and a multi-stage temporary supporting system is alternately formed in the foundation pit. Each supporting assembly serves as a formwork frame of the concrete support and temporarily supports the concrete support before the concrete support reaches the formwork removal strength, the lower layer supporting assembly provides temporary side wall supporting below the concrete support at the same time, layer-by-layer continuous excavation is achieved, waiting for the concrete strength is not needed, and the construction waiting time is shortened. According to the construction method, the liftable supporting assemblies are adopted for alternate supporting in the dry soil excavation stage and the underwater excavation stage, so that the foundation pit is in smooth transition among different working conditions. Meanwhile, after the dry soil is excavated to a certain depth, water is injected to the height of a confined water head, water pressure inside and outside the pit is balanced, confined water inrush and pit bottom upheaval are effectively prevented, and safe and continuous construction is achieved through dynamic supporting and cyclic utilization.

The invention discloses a deep and shallow well dewatering construction method for a multi-aquifer communicated stratum foundation pit. In order to solve the problems of sedimentation outside a pit and wall deformation caused by one-time pumping and descending of a traditional mixed well, a shallow well with a filter screen located in a phreatic layer and a deep well extending to a confined aquifer are arranged in a foundation pit in the construction method; measuring and setting out, exploring and digging, hole forming, hole cleaning and slurry changing, well pipe descending, filling, water stopping and well washing are sequentially completed, and then an independent pumping and descending system is formed; water level, water quantity and peripheral deformation data are obtained through a single well-group well test, and a deep well starting threshold value is determined; before the foundation pit is excavated, only a shallow well is started to drain a phreatic bed, deep well pressure reduction is started in an echelon mode after the foundation pit is excavated to the preset depth and a support is erected, and on-demand dewatering is achieved; the bottom plate construction stage is divided into three stages for well shut-in. The construction method can obviously reduce the drop amplitude of the water level outside the pit, the lateral displacement of the wall body and the ground surface settlement, has the advantages of safety, economy and environmental protection, and is suitable for coastal complex geology deep foundation pit engineering.

The invention discloses an optimization control method for the construction process of a long, large and deep foundation pit of a subway station, and relates to the technical field of foundation pit construction. Before construction, foundation pit geology and surrounding environment data are firstly obtained and analyzed to obtain a comprehensive foundation pit construction environment evaluation value, and the influence degree of foundation pit excavation is predicted according to the comprehensive foundation pit construction environment evaluation value; then, according to a prediction result, a proper optimal enclosure structure form is selected; secondly, dividing a target subway station into 10 foundation pit sub-regions, constructing an excavation sequence initial population by adopting integer coding, and analyzing a fitness evaluation value of each excavation sequence; and finally, according to the fitness evaluation value, determining the optimal excavation sequence of the target subway station. According to the method, through multi-step cooperation, a scientific and systematic optimal control scheme is provided for construction of the long, large and deep foundation pit of the subway station, and construction safety and quality can be guaranteed.

The invention discloses a drilling device for deep foundation pit engineering construction, and relates to the technical field of foundation pit drilling. Comprising a drilling installation part, an old hole positioning part is installed on the drilling installation part, and the old hole positioning part is used for limiting the drilling installation part; a hole sticking piece is mounted on the old hole positioning piece; the hole sticking piece is used for sticking a steel sheet pile hole; a displacement detection piece is mounted on the hole pasting piece; the displacement detection piece is used for controlling and compensating drilling offset; a displacement control piece is mounted at the bottom of the displacement detection piece; the problems that according to an existing drilling device for deep foundation pit engineering construction, adjacent drill holes are prone to deflection, automatic compensation of drill hole deflection is inconvenient, and soil is prone to falling into old holes are solved. The displacement control piece is adopted, the old hole positioning piece can be controlled, pressure is applied to the drill bit body in a compensating mode, the drill bit body can be assisted to drill holes with higher precision, and follow-up smooth installation of the steel sheet pile is promoted.

The invention belongs to the field of deep foundation pit intelligent supporting systems, and particularly relates to a deep foundation pit intelligent supporting system based on oblique beam grid and digital twinning and a collaborative construction method.The deep foundation pit intelligent supporting system based on oblique beam grid and digital twinning comprises an oblique beam grid supporting structure composed of two-way crossed steel oblique beams, and the outer layer of each steel oblique beam is a Q355B steel pipe with the thickness not smaller than 12 mm; the inclined beam is filled with ultra-high performance concrete with the compressive strength not smaller than 150 MPa, the inclination angle of the inclined beam ranges from 25 degrees to 60 degrees, and an MEMS micro-electro-mechanical system sensor is pre-buried at a node; and the digital twin platform integrates the geological BIM model and the LSTM neural network prediction model. The bending rigidity is improved through the oblique beam grid supporting structure and the concrete filled steel tube composite beam, the inclination angle ranges from 25 degrees to 60 degrees, force flow transmission is optimized, and micro-strain-level stress monitoring is achieved through the MEMS sensors embedded in the nodes. A digital twin platform and an LSTM model are fused with 12-dimensional parameters, the 72-hour deformation prediction error is smaller than or equal to 1.5 mm, and compared with a traditional experience algorithm, the precision is improved.

The present invention belongs to the technical field of foundation pit support, and in particular relates to an anti-collapse support structure for a deep foundation pit, comprising a foundation pit, a plurality of cast-in-place piles fixedly provided at the bottom of the foundation pit, a plurality of purlins fixedly connected to the side walls of each cast-in-place pile, a plurality of inclined anchor rods fixedly connected to each purlin and the side walls of the foundation pit, a retaining wall fixedly connected to the bottom of the foundation pit, and a plurality of active support mechanisms fixedly installed between the retaining wall and the plurality of cast-in-place piles. The present invention can improve the stability of the pile-anchor support, and can actively strengthen the support according to the pressure of soil collapse, thereby improving the anti-collapse performance of the support. At the same time, it can also be automatically triggered in stages to perform collapse buffering protection at the inner outer edge of the foundation pit, which can not only alert on-site personnel, but also reduce the degree of collapse risk and improve safety.