13 results about "Liquefaction resistance" patented technology

The invention relates to the technical field of mortar strength detection, in particular to a penetration type mortar strength detection device. According to the device, gravel attribute parameters corresponding to mortar to be detected are obtained through detection, the porosity of gravel is obtained through calculation based on the gravel attribute parameters, gravel liquefaction test of shear wave velocity is conducted on the gravel based on the porosity of the gravel, the liquefaction resistance strength of the gravel is obtained, and mortar preparation is conducted on the gravel meeting the mortar preparation requirement. The method comprises the following steps: detecting a mortar solidification sample based on a penetration type mortar strength detection instrument to obtain mortar strength, carrying out stability detection on the mortar solidification sample based on a transient dynamic method to obtain an integrity detection result of the mortar solidification sample, and evaluating the stability of the mortar solidification sample according to an analysis result to obtain a stability evaluation result. The quality of the mortar solidification sample is evaluated based on the mortar strength and stability evaluation result, and the accuracy and reliability of the quality detection result of the mortar solidification sample can be ensured according to the mortar attribute information.

The invention discloses a vibration table model box for simulating a discontinuous liquefied stratum and a test method, the model box comprises a model box body connected to a vibration table, and a sliding system, a drainage system and a partition fixing system which are arranged on the model box body, and the model box body is formed by encircling a plurality of groups of frames and a frame bottom plate; the internal space of the model box body is divided through the horizontal direction and vertical movement of the partition fixing system, the model box body is filled with liquefied soil foundation model materials in a layered mode according to the division position, the position of a discontinuous fault plane can be flexibly controlled, and then a discontinuous liquefied formation test is completed. According to the model box, through the combination of a plurality of groups of frames, a sliding system, a drainage system and an interval fixing system, accurate simulation of a discontinuous liquefied stratum is realized, and the test requirements of an earthquake response test and an anti-liquefaction test of an underground structure under the condition of the discontinuous liquefied stratum can be met; and deep research and understanding of liquefied formation characteristics in scientific research and engineering fields are facilitated.

The invention relates to a vibration high-strength composite foundation construction technology, and belongs to the field of engineering construction. According to the method, hole forming is conducted through vibration construction, then uplift pile forming is conducted through grouting or powder spraying, vibration impact construction, vibration tube sinking method construction or cross wing resonance method construction can be adopted in the vibration construction, a vibration impact device is adopted in the vibration impact construction, a vibration hammer and a pile tube are adopted in the vibration tube sinking method construction, and a vibration hammer and a cross steel plate are adopted in the cross wing resonance method construction. The vibration high-strength composite foundation does not have the pile breaking phenomenon, zero-overlapping construction and liquefaction resistance can be achieved if the vibration high-strength composite foundation is broken, gravel pile water permeability is compatible, the bearing capacity is remarkably improved, the construction cost is low, and operation is easy. When the underground water quantity is sufficient, a powder spraying process is adopted; when underground water is deficient, a grouting process is adopted; and the compatibility is very good.

The invention provides a method for treating a Yellow River downstream alluvial silt foundation through a resonance compaction method, and the method comprises the following steps: carrying out geological investigation on the Yellow River downstream alluvial silt foundation, and selecting proper resonance compaction equipment; positioning the resonance compaction equipment according to a preset interval and an arrangement mode; the resonance compacting equipment is started, and resonance compacting treatment is conducted on the foundation point by point according to set parameters; in the resonance compaction construction process, the resonance frequency of a vibration hammer-vibration rod-foundation soil system is monitored all the time; after foundation treatment is completed, an in-situ testing method and the like are adopted for detecting the foundation, and long-term monitoring is conducted on foundation settlement in the upper building construction and using process. According to the method, the resonance principle can be effectively utilized to rearrange silt particles, pores are reduced, the compactness and liquefaction resistance of foundation soil are improved, and the method has the advantages of being high in construction efficiency, low in cost, small in influence on the surrounding environment and the like.

The invention provides a composite foundation embankment system for a liquefiable site and a construction method, and relates to the field of foundation reinforcement. The composite foundation embankment system comprises a plurality of rigid plastic drainage plate combined piles, a plurality of vertical plastic drainage plates and a sheet pile wall; a plurality of rigid plastic drainage plate combined piles and a plurality of vertical plastic drainage plates are longitudinally arranged in a foundation at equal intervals in a square mode, sheet pile walls are arranged in the foundation on the two sides of an embankment, and a geotechnical cloth cushion layer and a geogrid reinforced broken stone cushion layer are sequentially laid on the top of the foundation to form a horizontal drainage channel. And an embankment bottom covering reinforcement layer and embankment filling soil are sequentially arranged above the horizontal drainage channel. The method has the effect of enhancing the liquefaction resistance of the foundation.

The invention discloses a construction method for reducing panel deformation and foundation liquefaction risks of an upper panel dam of a deep and thick covering layer in the water storage period, and belongs to the technical field of water conservancy projects. The method comprises the steps that (1) in the construction process, the whole face plate dam and upstream outer side filling soil are synchronously filled, so that the outer side filling soil generates pre-pressure on the face plate dam and provides an early-stage stress history, it is ensured that face plate deformation in the subsequent water storage period mainly presents linear elastic response approximately within the early-stage stress range, face plate deformation after water storage is reduced, and the construction efficiency is improved; the width of the outer filling bottom is calculated and determined according to the designed water pressure and the filling density, and it is guaranteed that the prestress reaches two times of the designed water pressure; (2) outer side filling soil applies ballasting load to the covering layer foundation, and the compactness of the foundation is improved; after filling is completed, outer side filling soil is excavated step by step to form a face plate dam structure; and (3) the outer side filling soil is moved to the more outer side area of the covering layer, and a ballasting zone is formed to improve the liquefaction resistance of the foundation. Deformation of the face plate in the water storage period is remarkably reduced, the overall safety of the dam body and the liquefaction resistance of the foundation are improved, and good engineering application value and popularization prospects are achieved.

A device and method for collecting heat bags and solidifying and filling calcareous sand foundation, belonging to the field of civil engineering geological treatment technology. The solar heat collection bag comprises a transparent and permeable part and an insulation material, wherein the insulation material comprises a heat absorbing layer, an insulation layer, and a fabric layer. The heat absorbing layer, insulation layer, and fabric layer are fixedly combined from top to bottom to form an integrated transparent and permeable part. The edge of the transparent and permeable part is the first edge, and the edge of the insulation material is the second edge; The transparent heat permeable part and insulation material are combined into one through the first and second edges, forming a containment space between the transparent heat permeable part and the insulation material, so that the medium contained in the containment space can be heated by solar energy. The device includes a water intake component, a solar collector bag, and a water injection component. This method is implemented based on the device. This device and method can significantly improve the overall strength, liquefaction resistance, and seepage characteristics of calcareous sand foundation, with low cost and high application prospects.

The invention discloses an environment-friendly loose and solid composite pile system for treating a coral sand roadbed and a construction method.The system comprises a gravel layer, a medium sand drainage layer, a bearing platform, composite piles and a conductive drainage plate, the medium sand drainage layer is laid on the periphery of the bearing platform, and the height of the upper surface of the medium sand drainage layer is flush with that of the bearing platform; a gravel layer is laid on the surface of the bearing platform and the surface of the medium sand drainage layer, the bottom face of the bearing platform is fixedly connected with a composite pile, the composite pile comprises a discrete pile and a rigid core pile, the rigid core pile is arranged in the middle of the discrete pile, a plurality of conductive drainage plates are inserted into the periphery of the composite pile, and the conductive drainage plates are laid below the medium sand drainage layer. The scattered and solid composite pile system has high adaptability and can be flexibly adjusted according to different geological conditions and construction requirements. And the bearing capacity, the stability, the drainage performance and the anti-liquefaction effect of the coral sand foundation are remarkably improved.

To provide a ground improvement method capable of taking measures against liquefaction including a huge earthquake motion while applying a density increasing method at an improvement rate of 20% or less which does not make construction difficult, and to provide an improved pile construction material applied to the ground improvement method and a method of manufacturing the improved pile construction material.SOLUTION: The material 300,400 for creating an improved pile is a material for creating an improved pile having a hydraulic conductivity with an excessive pore water pressure ratio of the improved ground being less than 1.0 under a condition that an FL value, which is calculated based on an improved N value obtained by improving an N value of an original ground and is a liquefaction resistivity with respect to earthquake motion of a predetermined scale, of the improved ground is less than 1.0.SELECTED DRAWING: Figure 2

This invention relates to the fields of seismic resistance in geotechnical engineering and construction technology in hydraulic engineering, and particularly to a vibration energy dissipation feedback control system for core wall anti-liquefaction. The system includes: a data acquisition and positioning module that acquires vibration response signals and location information in real time during the compaction process; a signal processing and feature extraction module that extracts characteristic parameters representing the dynamic state of the fill material; a real-time liquefaction risk diagnosis module that outputs a quantified liquefaction risk index using a pre-trained discriminant model; an intelligent decision-making and control command generation module that generates control commands based on this index; an actuator adaptive adjustment and targeted compaction module that drives the roller to adjust its working parameters and performs targeted enhanced compaction in high-risk areas; and a global iteration and visualization monitoring module that coordinates the entire process and generates a quality risk distribution map. This invention achieves real-time perception and adaptive closed-loop control of anti-liquefaction performance during construction, fundamentally improving the seismic stability of the core wall.

This invention provides a vertical drainage structure to improve the liquefaction resistance of driven gravel piles. The vertical drainage structure includes a grass mat layer laid at the bottom of the gravel pile and above the pile body, and a perforated steel pipe inserted into the middle of the gravel pile body. The grass mat layer is 8-12 cm thick, and the interval between adjacent grass mat layers is 0.8-1.2 m. An inverted U-shaped pipe and a drainage hose are provided at the end of the perforated steel pipe extending beyond the gravel pile body. This invention ensures a rapid drainage path while maintaining the strength of the gravel pile by using unevenly graded gravel. The grass mat layer, placed 1 m apart at the bottom and pile body, ensures smooth water passage while filtering soil particles, effectively preventing blockage of the drainage channel. The structure of this invention improves the drainage of gravel piles, avoids soil blockage of the drainage channel during construction, and ensures the liquefaction resistance of the gravel pile. Its construction is simple, low-cost, and can be rapidly promoted.

The invention relates to a prestressed pipe pile construction method, which belongs to the field of construction engineering pile foundation construction, and comprises the following steps: carrying out geological exploration on a pile position to obtain exploration data, and constructing a pile position three-dimensional geological model based on the exploration data; and on the basis of the three-dimensional geologic model, the pile position is preprocessed so as to weaken the soil squeezing effect. Through fine geological supplementary survey and three-dimensional modeling, the soil layer sequence and the rock surface elevation of each pile position are accurately predicted, then soil body pretreatment is correspondingly carried out, and the problems that the soil squeezing effect is remarkable, and pile sinking is difficult and deviates are solved. After the tubular pile is driven, cement-based slurry is injected into a pile-liquefied sand interface to form a consolidation body, so that the liquefaction resistance of soil around the pile and the pile side friction resistance are improved, and the problem that liquefied sand threatens the stability of a pile foundation is solved. Intelligent pile pressing equipment which has a real-time data acquisition function and interacts with refined geological supplementary survey and three-dimensional modeling data is used, comprehensive monitoring and feedback of the pipe pile driving process are achieved, and it is guaranteed that construction is safe and smooth.

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.