37 results about "Soil liquefaction" patented technology

The invention discloses a seismic signal-based soil-structure co-evolution seismic liquefaction analysis device and method, and the method comprises the steps: obtaining geological and seismic data of a target region, and constructing a geometric ratio, time ratio and acceleration ratio co-scaling system based on a Bockingham Pi similarity theory; a seismic liquefaction multi-field coupling evolution device is constructed to evolve the soil liquefaction process of a target area, a distributed optical fiber sensor array and a micro pore pressure meter group are adopted to form a millimeter-level spatial resolution monitoring network, and a high-speed camera system is matched to synchronously capture pore water pressure, structural strain and a soil shear band expansion process. Total element time sequence correlation analysis of vibration triggering, seepage developing and structural catastrophe is achieved, the influence degree of the total element time sequence correlation analysis on the earthquake is further analyzed, and a direct basis is provided for engineering restoration priority and a reinforcement scheme.

A marine foundation such as a jacket or a tripod foundation for a wind turbine comprises suction piles that are subjected, in service, to cyclical loading of compression phases and tension phases in alternation. Each pile has a one-way valve that opens and closes autonomously in response to pressure differentials between the internal chamber and the surrounding water. The valve opens during the compression phases to effect fluid communication between an internal chamber of the pile and surrounding water. Water is thereby ejected from within the chamber through the valve. Conversely, during the tension phases, the valve closes and water is admitted into the pile only through soil within a skirt of the pile. Thus, a unidirectional, generally upward flow of water is driven through the soil within the skirt during the compression and tension phases, maximising water flow friction and reducing the risk of liquefaction of the soil.

The invention relates to the technical field of ocean engineering safety monitoring, in particular to a submarine pipeline soil liquefaction slippage real-time monitoring system based on a sensor network, which comprises a sensor network deployment module, a dynamic baseline analysis module, a multi-source data space-time calibration module, a coupling risk assessment module and a grading early warning module. Wherein the sensor network deployment module is used for collecting multi-parameter data; the dynamic baseline analysis module is used for calculating the dynamic baseline range of each parameter; the multi-source data space-time calibration module is used for eliminating space-time deviation between sensor nodes and outputting space-time calibration data; the coupling risk assessment module is used for calculating a soil liquefaction slippage risk coefficient; and the grading early warning module is used for triggering early warning. According to the invention, through combination of multi-parameter perception, space-time calibration and risk fusion assessment, precise monitoring and graded early warning of submarine pipeline soil liquefaction slippage are realized, and monitoring continuity and early warning timeliness are improved.

The invention belongs to the field of geotechnical engineering, and particularly relates to a sand liquefaction discrimination method based on CPTU and weighted nonlinear similarity. Comprising the following steps: collecting sand CPTU data containing liquefaction and non-liquefaction cases, and calculating a cyclic stress ratio (CSR) as a derivative feature; preprocessing and standardizing the data and dividing the data into a training set and a test set; respectively calculating prototype vectors of liquefaction and non-liquefaction categories based on the training set; by analyzing the influence of disturbance of each characteristic value on the similarity of the sample and the prototype vector, calculating a characteristic weight to quantify the importance of the characteristic weight; constructing a weighted radial basis kernel function fused with feature weights, calculating the nonlinear similarity between the to-be-tested sample and the two types of prototype vectors, and converting the nonlinear similarity into a liquefaction probability; and based on the confidence coefficient of the information entropy quantification prediction result, uncertainty evaluation is realized. The method has high discrimination precision, strong interpretability and reliable uncertainty quantification capability, and effectively overcomes the defects of strong subjectivity and black box of a machine learning model in a traditional experience method.

The invention discloses an operation real-time monitoring system based on risk factor dynamic assessment, and relates to the technical field of desilting operation risk assessment, the system can comprehensively assess various potential risks in the desilting operation process through multi-dimensional environmental data acquisition and real-time monitoring, and the risk factor dynamic assessment is realized. Comprise dam instability, water flow shearing force, sediment disturbance, soft foundation stability and the like. The system calculates comprehensive risk factors according to the data, timely identifies risks and triggers early warning, and ensures the safety of an operation area. The system can dynamically evaluate the soil liquefaction risk by monitoring the soil liquefaction factor and the volume change of the workboat in real time, and prevents the workboat from inclining or sinking. In addition, the system generates and implements specific emergency strategies according to different early warning instructions, and takes effective protective measures to deal with sudden risks. The safety and efficiency of the dredging operation are improved, the potential accident risk is reduced, and the sustainability of the dredging operation is guaranteed.

The invention provides HDPE pipeline stabilizing equipment suitable for the quicksand geology and a mounting method thereof. The HDPE pipeline stabilizing equipment suitable for the quicksand geology comprises a plurality of supporting units arranged on an HDPE pipeline at intervals; each supporting unit comprises a supporting part and an anchoring part. The supporting component is arranged on the HDPE pipeline in a sleeving mode, and a plurality of sensors used for monitoring the geological environment and the state of the HDPE pipeline are arranged in the supporting component. The multiple anchoring components are connected with the supporting component, and the bottom ends of the anchoring components extend downwards and are anchored in a stable soil layer at the bottom of the quicksand geology. According to the HDPE pipeline stabilizing equipment suitable for the quicksand geology and the mounting method of the HDPE pipeline stabilizing equipment, it can be guaranteed that an instant and long-term stable synergistic effect of the HDPE pipeline in the quicksand geology can be achieved, the service life of the HDPE pipeline can be remarkably prolonged, meanwhile, the failure risk caused by soil liquefaction is reduced, and practicability is high.

The utility model discloses a shellfish vibrating, liquefying and harvesting device and shellfish harvesting equipment thereof. The shellfish vibrating, liquefying and harvesting device comprises a supporting frame body, a vibrating and harvesting unit and a vibrating and driving unit, the vibration harvesting unit comprises a lifting plate and a plurality of slapping plates; the striking and vibrating driving unit is arranged on the supporting frame body and is used for driving the plurality of slapping plates to perform lifting, striking and liquefying on the mud flat substrate so as to realize floating of shellfish in the liquefied mud flat substrate; according to the utility model, the striking driving unit can drive the slapping plates to lift at high frequency, and the slapping plates can strike and slap the surface of the mud flat substrate soil at high frequency, so that the mud flat substrate generates a soil liquefaction phenomenon, and mactra veneriformis buried in the mud flat substrate can float up to the surface of the mud flat substrate; compared with an existing digging and harvesting device, the digging and harvesting device does not need to dig mud flat substrates for screening and harvesting, the power needed by the harvesting device is small on the premise that the ecological environment is protected, and cost reduction and efficiency improvement are facilitated.

The invention provides a local artificial intelligence earthquake sand liquefaction deformation prediction method and system, and relates to the technical field of geological disaster prediction, and the method comprises the steps: obtaining multi-source geological data; 3-5Hz soil mass frequency domain features are extracted through wavelet packet decomposition, a DEM and a historical liquefaction thermodynamic diagram are fused to divide a sedimentary facies control unit, a three-dimensional voxel model is generated by adopting a Bayesian constrained improved Kriging algorithm, and a four-dimensional space-time tensor is constructed in combination with real-time seismic oscillation dominant frequency offset; inputting the tensor into a local adaptive graph convolutional network, dynamically adjusting the weight of a convolution kernel through a space-time attention mechanism, and synchronously outputting a prediction result; triggering incremental learning based on MEMS acceleration and FBG strain data, correcting a predicted value of an unliquefied region, and feeding back the predicted value to the voxel model; and finally, generating a probabilistic disaster chain scene tree through spatial pattern matching. The technical bottleneck that a traditional model is poor in adaptability in a complex sedimentary environment and cannot be updated in real time is solved, and intelligent early warning support is provided for engineering safety of an earthquake active area.

The invention discloses an offshore wind power single pile foundation based on a cemented riprap body and an offshore wind power device. The offshore wind power single pile foundation comprises a pile foundation, a protective sleeve arranged on the outer side of the pile foundation in a sleeving mode, a turbulent flow assembly installed on the protective sleeve and a protective assembly located on the periphery of the protective sleeve. The impact force of sea waves is gradually weakened through the protection assemblies, the impact force borne by the pile foundation is reduced, pore water in a gravel soil layer is guided to be directionally released in the vertical direction, soil liquefaction is avoided, the situation that the sea waves drive gravel near the pile foundation to impact the pile foundation is avoided, the stability of the pile foundation is further maintained, and the service life of the pile foundation is prolonged. Sea waves buffered by the protection assembly enter the turbulent flow assembly, a spinning disturbance effect can be generated under the action of sea wave fluid, fluid kinetic energy originally impacted on the root of a pile foundation in a concentrated mode is converted into streaming type vortex disturbance, and therefore the bottom flow speed is effectively weakened, local scouring force is reduced, and formation of scouring pits is restrained; and the stability of the pile foundation is further ensured.

The invention relates to the technical field of site saturated sandy soil liquefaction discrimination, in particular to a subway train shield tunnel underlying sandy soil layer liquefaction potential rapid assessment method based on vibration inversion, and solves the problem that the sandy soil liquefaction condition caused by subway train vibration loads cannot be assessed. The sandy soil liquefaction possibility of the target site under the action of subway train operation is rapidly and reliably evaluated, so that the requirement for early warning of liquefaction risks caused by subway vibration in the railway underpass shield tunnel engineering is met; according to the shear wave velocity Vs of the soil layer, the cycle resistance ratio CRR of the soil layer is determined; through vibration load inversion, the equivalent cyclic shear stress ratio (CSR) borne by the tunnel underlying soil layer is determined; when the equivalent cyclic shear stress ratio CSR is greater than the contrast soil layer cyclic resistance ratio CRR, the tunnel underlying layer has a liquefaction risk; otherwise, the tunnel underlying layer has no liquefaction risk.

This invention discloses an adaptive compensation control method for uneven settlement in soft strata, belonging to the field of settlement control in geotechnical engineering. The method involves collecting distributed micro-strain field and pore water pressure gradient data at the bottom of the foundation in the soft strata and inputting them into a stratum rheological evolution prediction model. Multi-scale spatiotemporal features are extracted using a spatiotemporal attention coding module to generate a stratum creep trend vector. The equivalent modulus correction coefficient is calculated using a virtual stiffness reconstruction algorithm to generate a dynamic stress wave excitation parameter set. Coherent stress beams are emitted using microarray actuators embedded in the bearing layer interface, and a dynamic stress-locking zone is constructed through constructive interference to form a virtual rigid support. The excitation parameters are corrected through a dual-loop adaptive feedback control mechanism combined with a heuristic optimization algorithm until the micro-strain field returns to uniformity. Simultaneously, energy dissipation monitoring and safety mechanisms are added to mitigate the risk of soil liquefaction. This invention achieves active suppression and adaptive compensation for uneven settlement in soft strata, improving the accuracy of settlement control.

The present application belongs to the technical field of earthquake sandy soil liquefaction evaluation, and in particular relates to an evaluation data acquisition method for earthquake liquefaction potential evaluation and an earthquake liquefaction evaluation method, wherein the evaluation data acquisition method comprises the following steps: S1, acquiring a seismic displacement waveform or a strain waveform of a target site during an earthquake; S2, detecting a wave peak and a wave trough of each period of each component seismic displacement waveform or strain waveform, calculating a difference value between the wave peak and the wave trough, and comparing the difference value with a preset statistical significance threshold; and S3, obtaining a dynamic cyclic vibration number representing the driving strength of earthquake liquefaction based on period counting. The present application solves the technical defect that the prior art cannot accurately reflect the actual dynamic loading level of soil during an earthquake, and provides a measurement method for directly acquiring key physical parameters that can truly reflect the driving strength of earthquake liquefaction from displacement waveforms or strain waveforms and a liquefaction potential evaluation method.

The invention discloses a soil liquefaction geological disaster demonstration device and a use method thereof, and relates to the technical field of geological disaster demonstration, the soil liquefaction geological disaster demonstration device comprises a base, the upper part of the base is slidably provided with a demonstration box, and the base and the demonstration box are jointly provided with a motion assembly; the first driving unit and the second driving unit are arranged on the base, the rotating disc is rotationally connected with the side face of the base, the movable rod is movably connected with the side face of the rotating disc, the concentric-square-shaped plate is installed on the side face of the demonstration box, the concentric-square-shaped plate is movably connected with the movable rod, and the first driving unit drives the rotating disc to rotate; according to the soil liquefaction geological disaster demonstration device, the motion assembly is arranged, when soil liquefaction geological disaster demonstration is carried out, the motion amplitude of the demonstration box is changed in real time, the irregular motion amplitude can simulate the broadband characteristic of seismic waves, and the experiment result is closer to the actual seismic liquefaction phenomenon.

The invention relates to the technical field of foundation piles, in particular to a precast pile structure for a sea silt soil site and a pile body grouting reinforcement method. The precast pile structure comprises a plurality of pile columns which can be spliced with one another and a pile tip connected to the lowest pile column; the pile column comprises a pile body, an upper connecting flange and a lower connecting flange, wherein the upper connecting flange and the lower connecting flange are connected to the two ends of the pile body. By injecting a curing agent into a soil layer with a preset depth to cure the soil layer around the pile body and grouting and curing the soil body around the pile, the strength of the soil layer is improved, the side frictional resistance of a pile-soil interface is improved, meanwhile, pile end grouting forms an expanded head effect, the end bearing force is increased, and the method is particularly suitable for a site with a shallow bearing layer missing; due to the fact that the soil body is solidified, the compactness and the impermeability of the soil layer are improved, the risk of soil body liquefaction under the dynamic load is remarkably reduced, the impermeability of the solidified soil body around the pile is improved, and strength degradation caused by underground water erosion is relieved.

The utility model relates to the technical field of cast-in-place piles, and discloses a reinforcement cage structure suitable for cast-in-place pile construction in a coastal tidal liquefaction site, which comprises a plurality of longitudinally arranged main reinforcements, the main reinforcements extend along the axial direction of the reinforcement cage structure, and the peripheries of the plurality of main reinforcements are surrounded by stirrups; the main ribs are arranged at intervals in a surrounding mode to form a cage space, a reinforcing section is formed on the upper portion of the cage space, a plurality of horizontally-arranged reinforcing structures are arranged in the reinforcing section, and the reinforcing structures are connected with the main ribs and limit the main ribs from deviating from the cage space to deviate outwards. Thus, the reinforcing structure is designed in the reinforcing section of the cage space, so that the tying effect on the main reinforcement of the reinforcement cage is enhanced, the adverse effect of the cast-in-place pile for resisting soil liquefaction is improved, and meanwhile the shear resistance of the cast-in-place pile for resisting the cyclic reciprocating horizontal effect of tidal fluctuation is also improved.

The present invention relates to the technical field of offshore engineering safety monitoring, and particularly relates to a real-time monitoring system for submarine pipeline soil liquefaction and slip based on a sensor network, which includes a sensor network deployment module, a dynamic baseline analysis module, a multi-source data spatio-temporal calibration module, a coupled risk assessment module, and a hierarchical early warning module; wherein: The sensor network deployment module: is used to collect multi-parameter data; The dynamic baseline analysis module: calculates the dynamic baseline range of each parameter; The multi-source data spatio-temporal calibration module: eliminates the spatio-temporal deviation between sensor nodes and outputs spatio-temporally calibrated data; The coupled risk assessment module: calculates the soil liquefaction and slip risk coefficient; The hierarchical early warning module: is used to trigger an early warning. With the present invention, through the combination of multi-parameter perception, spatio-temporal calibration, and risk fusion assessment, accurate monitoring and hierarchical early warning of submarine pipeline soil liquefaction and slip are achieved, improving the continuity of monitoring and the timeliness of early warning.

The invention belongs to the technical field of geotechnical engineering, and provides a gravelly soil liquefaction settlement prediction method based on a dynamic penetration test, which can make full use of in-situ dynamic penetration test data, comprehensively considers physical characteristics of gravelly soil and uncertainty of liquefaction settlement, and provides a gravelly soil liquefaction settlement prediction method based on a dynamic penetration test. Therefore, the dynamic response characteristics are effectively reflected, and a scientific basis is provided for anti-seismic safety evaluation and design of the foundation. According to the technical scheme, the gravelly soil liquefaction settlement prediction method based on the dynamic penetration test comprises the following steps that S1, a DPT test is conducted on a site, the DPT hammering number is corrected, and a volume strain curve is established, S2, prediction settlement and the probability of exceeding a given settlement value are calculated, and S3, a liquefaction settlement exceeding probability curve is drawn according to different target settlement values.

The utility model relates to the technical field of foundation pile, more particularly to the prefabricated pile structure for the embedded grouting channel in the sea silt site, including a plurality of mutually splicable pile columns and the pile tip connected to the last pile column, the pile column includes the pile body and the upper connection flange and the lower connection flan connected to the both ends of the pile body. Through the injection of solidifying agent to the soil layer of predetermined depth to the soil layer around the pile body solidification, the soil body around the pile grouting solidification, the soil layer strength promotes, the pile-soil interface side friction increases, simultaneously, the pile end grouting forms the expansion head effect, and the end bearing force increases, especially suitable for the site of shallow bearing stratum loss, further, because the solidified soil body makes the compactness and the anti-permeability of soil layer improve, significantly reduce the soil liquefaction risk under the dynamic load, the anti-permeability of the soil body around the pile after solidification improves, slows down the strength degradation caused by the groundwater erosion.

The application discloses a rotary drilling rig and a construction method thereof. The rotary drilling rig comprises a chassis, a drill mast, a vibration assembly and a pressurizing system. The drill mast is connected to the chassis. The vibration assembly comprises a vibration hammer and a tool connecting structure arranged on the vibration hammer. The vibration hammer is slidably connected to the drill mast in a lifting manner. The pressurizing system is connected between the drill mast and the vibration hammer to drive the vibration hammer to lift. When a casing is buried, the tool connecting structure is used to connect a casing to be buried. The pressurizing system is used to press down the casing. The vibration hammer is used to drive the casing to vibrate at a high frequency. The vertical vibration of the casing is transmitted to the casing, so that the soil structure around the casing changes and the strength is reduced. The soil around the casing is liquefied, the frictional resistance between the side of the casing and the soil is reduced, the casing is sunk into the soil by the gravity of the casing, the gravity of the vibration hammer and the pressurizing force of the drilling rig downward, the resistance in the process of burying the casing is reduced, the functions of quickly vibrating the casing into the soil and pulling out the casing are realized, and the burying efficiency is improved.

The invention discloses a mountain torrent disaster grading early warning method and system based on soil water content dynamic coupling, and belongs to the technical field of mountain torrent early warning. The method comprises the following steps: breaking through the limitation of a traditional static threshold by constructing a dynamic threshold model for multi-source soil humidity data fusion; a multi-stage early warning trigger mechanism is formed by combining a Kalman filtering real-time correction coefficient, and targeted information pushing and pre-arranged plan dynamic generation are achieved; the dynamic threshold model is constructed through a nonlinear regression model; the multi-stage early warning trigger mechanism comprises blue early warning: real-time rainfall is greater than or equal to 0.7 dynamic critical rainfall threshold; yellow early warning: R is greater than or equal to 0.85 dynamic critical rainfall threshold and the real-time soil water content is greater than or equal to 80% soil saturation water content; red early warning: R is greater than or equal to a dynamic critical rainfall threshold value and a soil liquefaction risk index gt; and 0.6. Through a soil water content dynamic coupling mechanism, three major pain points of data splitting, model stiffness and insufficient aging in mountain torrent early warning are solved.

The utility model relates to a sand liquefaction test vibration table, which comprises a base, a side rocking jack, a mechanical spring, a table top, a positioning steel plate, a model box, a motor, an eccentric wheel, a frequency converter and an automatic cycle timing controller, the upper side of the table top is connected with a model box, two parallel positioning steel plates are vertically welded on the lower side of the table top and used for fixedly mounting a motor; bolt holes are preset in the positioning steel plate in the horizontal direction, the vertical direction and the clockwise 45-degree direction, and the motor and the positioning steel plate can be fixedly connected in the horizontal direction, the vertical direction and the clockwise 45-degree direction through bolts. Three vibration modes of vertical vibration, horizontal vibration and horizontal and vertical simultaneous vibration can be respectively realized. Compared with the prior art, the device has the advantages of simple structure, stable operation, adjustable vibration direction and frequency, controllable vibration duration, observable displacement and deformation of a test material and the like.

The present application discloses a method for testing and evaluating the liquefaction grade of soil layers, which relates to soil layer testing technology. The present application sets the vibration acceleration and frequency of a vibration generator in advance according to the design basic earthquake acceleration value, earthquake grouping and site category, arranges a pore water pressure gauge in the vibration generator, and after drilling to the depth of the soil layer to be tested, lowers the vibration generator, monitors the change of pore water pressure in the soil layer by the pore water pressure gauge, and evaluates the liquefaction grade of the excavated layer according to the ratio of the maximum pore water pressure Pmax to the self-weight pressure Pc of the overlying soil layer.

This invention provides a steel pipe and a method for installing it that suppress differential settlement of existing residential buildings due to soil liquefaction. [Solution] Steel pipes are driven into the ground within the site of an existing house, in accordance with the surrounding environment, such as adjacent houses, buildings, and structures.

The invention discloses a large-scale liquefaction disaster rapid response analysis method and system based on a Bayesian network, and relates to the technical field of geotechnical engineering earthquake resistance, and the method comprises the steps: carrying out the earthquake risk decoupling of a to-be-analyzed region based on CPSHA, and determining the magnitude and epicentral distance of a plurality of earthquake events; simulating by adopting a kinematics mixed seismic source model of fault physical fracture to obtain seismic oscillation parameters of the to-be-analyzed area; constructing a liquefied sample library; constructing a soil liquefaction evaluation parameter, and carrying out standardization processing on the soil liquefaction evaluation parameter to obtain raster data; extracting numerical values from the raster data and the liquefied sample library to form a sampling table; performing accuracy analysis and data training on the sampling table to form a conditional probability table; and based on the conditional probability table, through a naive Bayes probability model and a weighted naive Bayes probability model, calculating the liquefaction probability and the non-liquefaction probability of the to-be-analyzed area. The technical problems of high cost and time consumption in the prior art are relieved.

The present application relates to the field of composite foundation structure, especially to a box type roadbed composite foundation structure and a construction method. The box type roadbed composite foundation structure is composed of an upper frame box type roadbed and a lower combined composite foundation. The combined composite foundation includes a cushion layer, a microbial solidified crust layer and a pile body from top to bottom. The upper end of the pile body is located inside the microbial solidified crust layer. The pile body adopts two types of CFG pile and bulk pile. The present application combines the frame box type roadbed structure and the combined composite foundation structure, fully utilizes the structural characteristics of each structure, ensures the stability of the roadbed, reduces the land used by the roadbed slope and the foundation treatment range, saves the overall cost of the roadbed, solves the shortcomings of single pile type foundation treatment in the super deep overburden karst stratum, significantly improves the foundation bearing capacity, eliminates the soil liquefaction of the foundation, reduces the cost of the karst roadbed engineering, and avoids the construction of the super long cast-in-place pile.

The invention discloses a soil gas-induced liquefaction test device and a test method, and relates to the field of soil liquefaction test equipment. According to the device, the sample cylinder is filled with sample soil and water, gas is continuously supplied into the sample cylinder through the gas supply mechanism, and the gas continuously seeps upwards along the sample cylinder, so that the seepage impact state of natural gas on the seabed sand soil layer is simulated, and meanwhile, the air pressure of the gap of the sand soil layer is detected through the air pressure detection mechanism; therefore, the soil liquefaction degree of the sandy soil layer under the corresponding air pressure can be obtained by observing the state of the sandy soil layer during gas seepage impact, and data support is provided for monitoring and prevention of soil gas-induced liquefaction of a seabed natural gas layer. The air distribution structure is arranged at the bottom end of the sandy soil layer in the sample cylinder and is communicated with the air supply assembly through the air pressure regulating valve, and when the air supply assembly supplies air into the sample cylinder, the air pressure regulating valve can perform constant-pressure regulation on the air pressure in the air distribution structure, so that the influence of air pressure fluctuation on the test process is prevented, and the test accuracy is improved.

The utility model provides a kind of underground water sampling device, belong to sampling equipment technical field, solve the underground water sampling cumbersome difficulty, time-consuming and labor-consuming, the water sample taken suffers pollution problem.Underground water sampling device includes: the drill rod with top opening and bottom opening;Fixedly connected on the outer surface of the drill rod multiple blades;Screw is connected at the bottom opening of the drill rod;Iron screen is installed on the inner surface of the drill rod.The technical scheme of the utility model utilizes sand soil liquefaction to take water, can directly obtain unpolluted underground water water sample in sand soil stratum, it is convenient and fast, simple and practical in design, reduces underground water sampling difficulty.

The bridge pile foundation comprises a wall body, a top plate and a pile body, the top plate is connected to the top end of the wall body, the pile body penetrates through the top plate and the wall body, a filter cylinder is arranged between the pile body and the wall body, and the upper end of the filter cylinder is connected with a suction device; a positioning plate is connected into the wall body and abuts against the periphery of the pile body. The pile body penetrates through the top plate and the wall body, and the positioning plate is connected in the wall body to abut against the periphery of the pile body, so that the pile body is not suspended in the wall body any more, the pile body and the wall body are mutually supported through the positioning plate, and the overall stability of the pile foundation is improved. And the filter cylinder is arranged between the pile body and the wall body, when water in far-field sandy soil flows into a near field, the water is sucked by the suction device after being filtered by the filter cylinder, and the water is effectively blocked, so that the bridge pile foundation can weaken the water pressure in the sandy soil around the pile body, sandy soil liquefaction is avoided, and the stability of the pile body is improved.