17 results about "Soil liquefaction" patented technology

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 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 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 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.

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 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 application discloses a soil liquefaction surface deformation field measuring system based on digital image technology, which comprises a control platform, a servo control and data acquisition system, a workbench, a support table, a soil box, an angle adjusting mechanism, a power loading system and a digital image deformation measuring system. The system can non-contact, full-field and high-resolution acquire the evolution data of the displacement field and the strain field of the soil surface in the vibration process, and can adapt to model tests of different sizes and inclination angles, thereby providing an advanced technical means for in-depth research on the liquefaction mechanism of saturated sand.

This invention discloses a method and system for identifying seismic liquefaction of sandy soil based on a coupled SSA-CNN-SVM model. This invention relates to the field of seismic safety assessment technology and includes the following steps: acquiring a historical sandy soil liquefaction sample dataset, including key influencing indicators and liquefaction state labels; simultaneously collecting geographical location information; extracting statistical feature parameters to calculate the liquefaction resistance index and seismic intensity index; performing weighted similarity measurement based on geographical feature parameters; dividing the sample area into multiple geological regions using a hierarchical clustering algorithm; within each region, calculating the Mahalanobis distance between sample areas; performing secondary clustering using a density-based clustering algorithm to identify clusters of samples with similar liquefaction mechanisms; and establishing a prediction model coupled with a deep learning model and optimization algorithm for each cluster to achieve liquefaction hazard assessment, significantly improving the accuracy and robustness of sandy soil seismic liquefaction identification.

The combined foundation comprises a large-diameter steel cylinder and a plurality of negative-pressure sinking-assisting skirt cabins which are arranged on the outer side of the large-diameter steel cylinder in the circumferential direction continuously or at intervals, and a skirt cabin one-way hole valve is arranged on a top cover plate of each negative-pressure sinking-assisting skirt cabin. The channel is used as a channel for natural discharge and negative pressure discharge of water in each negative pressure sinking-assisting skirt cabin; and the skirt cabin one-way hole valve is connected with a negative pressure system through a negative pressure pipeline. During penetration, each negative pressure sinking assisting skirt cabin is sucked through a negative pressure system, sinking assisting is carried out on the large-diameter steel cylinder, and unpowered sinking of the large-diameter cylinder type foundation is achieved; in addition, the skirt cabin array further remarkably improves the bearing performance of the combined foundation. The method breaks through the limitation that a traditional large-diameter barrel type foundation is prone to failure due to liquefaction and damage of soil in a barrel due to negative pressure or vibration impact sinking, and the sinking depth is insufficient due to the fact that the barrel type height is too large.