67 results about "Soil strength" patented technology

The invention relates to a solidified soil proportion and strength prediction method and system based on SEM image analysis, and belongs to the technical field of solidified soil strength testing. Comprising the following steps: S1, measuring physical indexes of disturbed soil; s2, multi-working-condition sample preparation and maintenance; s3, fractal dimension calculation of the SEM image is carried out; s4, unconfined compressive strength testing; s5, establishing a microstructure inversion model and a macroscopic strength prediction model; and S6, proportion optimization and strength prediction: utilizing the microstructure inversion model and the macroscopic strength prediction model to carry out solidified soil proportion optimization or strength prediction. According to the method, the quantitative relation between the microstructure (fractal dimension) and the macroscopic strength is established through SEM image analysis, the defects in the prior art are overcome, and a brand new technical path is provided for resource utilization of disturbed soil.

The invention relates to an iron tower foundation safety analysis method considering the dry-wet cycle effect. The method comprises the following steps that 1, a soil body strength degradation constitutive model is established; 2, determining iron tower foundation structure parameters and soil body parameters; 3, establishing an iron tower foundation-soil body three-dimensional geometric model by utilizing three-dimensional modeling software and rock-soil finite element simulation software; 4, applying a load transmitted to the iron tower foundation by the power transmission iron tower in the iron tower foundation-soil body three-dimensional geometric model, defining initial parameters, and establishing a rainwater seepage and dry-wet cycle coupling effect analysis model; 5, analyzing and predicting the cycle index when the safety coefficient of the iron tower foundation is reduced to a threshold value from the two aspects of tower foundation ultimate bearing performance and iron tower foundation-soil body interaction on the basis of a rainwater seepage and dry-wet cycle coupling effect analysis model; according to the method, an efficient and accurate numerical analysis means can be provided for safety assessment of the power transmission tower foundation in the collapsible loess area.

The invention discloses a dredged mud upper and lower part double-face combined vacuum consolidation drainage method, which comprises the following specific implementation processes: laying a horizontal sand bag containing a PVC (Polyvinyl Chloride) pipe and a vertical drainage pipe at the bottom of a cofferdam foundation pit to serve as a bottom drainage system, blowing and filling dredged mud in a layered manner, controlling the thickness and the water content of each layer, and when the water content of a soil body is lower than twice liquid limit, stopping drainage; starting the bottom vacuum water pumping device to perform preliminary water drainage, inserting straw bundles into the soil body through hollow pipes with bottom covers to form a vertical water drainage structure after the strength of the soil body meets the requirement, sequentially laying geotechnical cloth, a straw woven blanket, a PVC water drainage pipe network and a sealing film on the top to construct a top vacuum system, and finally synchronously starting the top vacuum water pumping device and the bottom vacuum water pumping device. The vacuum difference is controlled by adjusting the ventilation device, and upper and lower double-face combined vacuum consolidation drainage is achieved. The drainage consolidation of the dredged mud is effectively accelerated, the treatment efficiency is improved, and the drainage effect is enhanced through precise control over the vacuum degree and application of materials such as straw.

An agricultural machine includes a soil strength generation system that generates an output indicator of soil strength. A control system generates on action signal based on the soil strength.

The invention relates to the technical field of data processing, and discloses a method for determining construction parameters of foundation pit excavation. Rainfall information and construction progress information of the to-be-excavated area in the foundation pit excavation process are obtained; determining target soil body strength and underground water level information of the to-be-excavated area according to the rainfall information; inputting the target soil body strength, the underground water level information and the construction progress information into the first finite element model to obtain a second finite element model; and through a second finite element model, or through a particle swarm algorithm and the second finite element model, optimizing the first construction parameter to obtain a second construction parameter. According to the technical scheme, the construction parameters can be adjusted according to the rainfall information in the excavation process of the foundation pit, the deformation condition of the foundation pit after excavation of the foundation pit can be reduced, and the safety and the excavation efficiency of the foundation pit can be improved.

The application discloses a kind of solidified soil strength calculation method and system considering freeze-thaw cycle number and burying depth, propose the strength and modulus reduction factor concept of solidified soil under different freeze-thaw cycle;Then according to the test data obtained, the strength and modulus reduction factor of solidified soil under the action of freeze-thaw cycle under different burying depth is calculated;Strength and modulus reduction factor and burying depth, freeze-thaw cycle number composite exponential function model is established;Through composite exponential function model, the reduction factor of solidified soil under different freeze-thaw cycle is calculated, the strength and modulus of solidified soil without freeze-thaw cycle obtained by indoor test are combined, and the strength and modulus of solidified soil under different depth and freeze-thaw cycle are calculated.In practical engineering, the strength and modulus of solidified soil under different freeze-thaw cycle number at different burying depth can be used for long-term strength and deformation calculation of foundation.

The application discloses a large-section railway tunnel surrounding rock stability control method, comprising the following steps: step S1, using a soil strength device to detect the strength in the tunnel; step S2, dividing out the broken area with soil strength lower than a predetermined threshold and marking it as a low-strength area, and dividing out the area with soil strength higher than the predetermined threshold and marking it as a high-strength area; step S3, according to the different strength parameters of each low-strength area, calculating the amount of grouting material needed to be injected into each low-strength area to achieve the same strength, and injecting the corresponding amount of grouting material into each low-strength area; step S4, covering the surface of the low-strength area with a glass fiber cloth; and step S5, coating a layer of concrete. According to the application, targeted grouting is carried out according to the different strengths of different broken areas, so that the broken areas with different strengths can achieve relatively consistent strength after reinforcement treatment, and the purpose of uniformly strengthening the tunnel is finally achieved.

The invention discloses a slope stability prediction correction system and method based on multi-modal deep learning, and the system comprises a prototype prediction branch module and a model correction prediction branch module, and the prototype prediction branch module comprises a soil parameter inversion model and a prototype prediction composite model. The soil mass parameter inversion model is used for inverting and correcting soil mass strength parameters in real time according to the real-time settlement monitoring data of the side slope, and the prototype prediction composite model is used for predicting the stability of the side slope according to geometric parameters of the prototype side slope, the corrected soil mass strength parameters, slope images and settlement monitoring time sequence data; and the model correction prediction branch module is used for correcting slip crack surface position information obtained by the model test according to the parameters of the reduced scale physical model test, the reduced scale proportion and the model test image, and outputting the potential slip crack surface parameters of the prototype slope and the safety coefficient Fs-p of the prototype slope. According to the method, the stability data of the prototype slope can be obtained in real time, the slope stability result of the model test can be automatically corrected, and the prediction accuracy is ensured.

The invention provides an MICP-based sandy soil reinforcement stability evaluation method, device, equipment and medium, and relates to the technical field of soil reinforcement, and the method comprises the following steps: respectively adding an ammonium standard solution into sodium modified zeolite and alkalization modified fly ash to determine the ammonia nitrogen removal rate, and screening candidate mass ratios; on the basis of the candidate mass ratio, the sodium modified zeolite and the alkalized modified fly ash are doped into the standard sand columns correspondingly, the bacterial liquid and the cementing liquid are injected for an MICP reaction, and a solidified sand column is obtained; the dry density and the calcium carbonate generation amount of the multiple solidified sand columns are measured, an unconfined compressive strength experiment is conducted, and an unconfined compressive strength value is obtained; the distribution form of calcium carbonate crystals is observed through a scanning electron microscope for the multiple solidified sand columns, and gelling substances are analyzed through X-ray diffraction; and judging an unconfined compressive strength value based on a microscopic analysis result, and when the unconfined compressive strength value meets a sandy soil solidification threshold value, outputting a solidification grade and a sandy soil strength value to finish stability evaluation. The problem that sandy soil reinforcement is not stable is solved.

The invention belongs to the field of geological disaster prevention and control, and particularly discloses a slope safety coefficient calculation method considering an upward inclined drainage hole, which comprises the following steps: establishing a slope seepage numerical simulation model containing the upward inclined drainage hole, and obtaining space coordinates of nodes in a slope and pore water pressure data through finite element calculation; generating a potential slip plane based on an upper limit theorem of limit analysis, and calculating a pore water pressure value at each discrete point on the potential slip plane by using a Kriging interpolation method and taking node space coordinates and pore water pressure data as samples; according to the potential slip plane, the soil body strength parameter and the pore water pressure value obtained through interpolation, a balance equation of the soil body gravity power, the pore water pressure power and the internal energy dissipation power when the slope is in the critical failure state is established; and solving the balance equation to obtain the slope safety coefficient considering the inclined drainage hole. According to the method, the slope safety coefficient considering the inclined drainage hole can be efficiently and accurately calculated.

The utility model relates to the field of foundation engineering construction, in particular to a composite pile structure capable of firstly draining water and then reinforcing, which comprises a geogrid rolled into a barrel shape, a layer of geotextile fixed on the inner side surface of the geogrid, a grouting pipe vertically inserted on the inner side of the geotextile, a plurality of radial through holes arranged on the side wall of the grouting pipe at intervals, and a plurality of drainage holes arranged on the side wall of the grouting pipe. The surrounding area between the outer wall of the grouting pipe and the inner wall of the geotechnical cloth and the grouting pipe are filled with broken stones, cement mortar injected after soft soil drainage is poured into gaps among an inner cavity of the grouting pipe, the radial through holes and the broken stones, and the grouting pipe, the broken stones and the geotechnical cloth are fixed into a whole through the cement mortar. According to the composite pile, the soft soil strength can be improved, and the high strength of the composite pile can be fully utilized.

The invention relates to the field of roadbed soil treatment, in particular to a roadbed in-situ soil high-performance ecological reinforcing agent, a preparation method and a construction method, and the reinforcing agent comprises the following raw materials in percentage by mass: 45-85% of sulphoaluminate cement; 8%-25% of Portland cement; 3%-5% of quick lime; 0%-15% of fly ash; 0%-8% of silica fume; 0-15% of superfine slag powder; 3%-5% of sodium sulfate; 0%-2% of sodium silicate; 0%-0.8% of lithium carbonate; 0%-1.5% of a polymer reinforcing agent; 0%-1.5% of organic silicon powder; and 0.1%-0.3% of sodium lignin sulfonate. The reinforcing agent effectively combines the advantages of sulphoaluminate cement and Portland cement, combines other components, has the characteristics of rapid coagulation, rapid early strength development and the like, can regulate and control the soil strength, meets the requirements on compressive strength and durability in engineering construction, shortens the construction period and reduces the construction cost. And the requirement of 4-6h rapid traffic under an emergency repair scene is met.

The application discloses a kind of acid lead-zinc contaminated soil remediation methods, belong to environmental geotechnical engineering technical field.The application includes that acid lead-zinc contaminated soil is mixed with solid component of solidifying agent uniformly, then mixture is sprayed with phosphoric acid solution, obtains solidified soil, completes acid lead-zinc contaminated soil remediation;The solid component of solidifying agent includes by mass fraction: fly ash: 90~100%, diatomite: 0~10%.The application can effectively construct physical adsorption-chemical fixation-structure locking triple solidification mechanism in the process of repair, to effectively strengthen the solidification and stabilization effect of heavy metal pollutants of acid lead-zinc composite contaminated soil, after repair, soil strength can be increased by about 6.59 times, lead, zinc fixation rate is more than 99.7% and 73.9% respectively, compared with traditional cement-based solidifying agent, carbon emission is reduced by about 40%, so that the soil body after repair can maintain stable morphology and heavy metal solidification effect under extreme conditions, realize contaminated soil resource utilization by waste disposal, with the characteristics of efficient and stable, environment-friendly, cost-saving.

The present application belongs to the field of geotechnical, geological and environmental research, and provides a soil strength weakening-recovery characteristic testing device, which comprises an actuation and collection system, a soil disturbance system and a soil strength measurement system. The soil disturbance system adopts a net-like grid structure, and realizes the remolding of soil through rotating the grid; the soil sample strength measurement system mainly refers to the traditional vane shear apparatus, and installs a pore water pressure sensor on the top of the vane head to test the consolidation state of the soil. For the soil at the same position, the process of soil strength measurement-remolding-resting (for different time)-strength measurement is repeatedly carried out to analyze the weakening and recovery law of soil strength. The method of the present application makes up for the lack of effective technical means in the field of current geotechnical investigation in the aspect of soil strength weakening-recovery characteristic testing, and based on the method, the soil strength weakening characteristics and strength recovery law can be quickly and accurately obtained, which provides an important reference for geotechnical engineering design and engineering stability analysis.

The invention discloses a construction inspection method for a solidified soil road. The construction process of the solidified soil road comprises the steps that a roadbed is excavated, roadbed soil materials are compacted, and a stable roadbed layer is constructed; paving the soil material and the curing agent on the surface of the road cushion layer according to the mixing ratio of the dry-mixed cured soil, spraying mixing water mixed with the curing agent, mixing, and compacting and flattening to form a roadbed layer; uniformly mixing and stirring a construction land soil material, a curing agent and water according to a preset proportioning ratio to form flow-state solidified soil, uniformly pouring the flow-state solidified soil onto the grid structure to an elevation, after the flow-state solidified soil is initially set, spreading a wear-resistant agent on the surface of the flow-state solidified soil, and curing to form a pavement layer; the solidified soil road inspection comprises the steps of inspecting the fluidity of the curing agent neat paste before preparing the solidified soil, inspecting the flow state expansion degree of a flow state solidification graph, inspecting the strength of the flow state solidified soil and inspecting the structural strength of the road.

This invention discloses a centrifuge testing and observation system suitable for suction anchors. The system includes a test foundation and a suction anchor model housed inside a model box, a pulley support assembly on the upper part of the model box, a camera support, a laser displacement measurement assembly, a horizontal loading mechanism, and a support frame. The horizontal loading mechanism connects to the anchor point of the suction anchor model via rigging and the pulley guide frame, thereby achieving model loading. This experimental device has wide applicability, is not limited to any type of test foundation, and the height and position of various support components can be adjusted at any time according to the soil height of the model box and the required loading angle. The system is equipped with a T-bar or CPTu, a laser displacement sensor, a pore pressure gauge, and an accelerometer, enabling precise and diverse measurements of soil strength, soil settlement, pore pressure within the test foundation soil, and model movement. It can efficiently and conveniently observe the dynamic response of the suction anchor and the response of the test foundation soil.

The invention relates to the field of rock-soil testing, in particular to a rock-soil dual-purpose multifunctional electrodeless resistivity detection system and a test method. The device comprises an electrodeless non-contact rock-soil body dual-purpose electromagnetic induction testing device, hydraulic equipment, hard soil strength-resistivity synchronous testing corollary equipment and soft soil deformation-resistivity synchronous testing corollary equipment. According to the system, based on the electromagnetic induction principle and the Ohm law, a closed loop formed by connecting a rock-soil sample and an annular pipe filled with a dielectric solution is creatively used, then the resistivity of the rock-soil sample is calculated by adopting a difference value method, and an original annular mold which can only be used for a soft sample and a sample with the matched size is replaced; and the device is combined with existing rock-soil body strength-deformation corollary equipment for use. According to the invention, the nondestructive resistivity test of the soft and hard rock-soil body is realized, the electromagnetic method has multifunctionality in the resistivity test process of the rock-soil body by combining with corollary equipment, and the resistivity test of the indoor rock-soil body is more convenient, efficient and accurate.

This invention relates to the field of foundation reinforcement engineering, specifically to a grouting hole construction device and construction process. It includes: an outer pipe, a rigid tubular component with several sets of grouting openings evenly distributed circumferentially on its wall, the axial distance between adjacent sets of openings being 0.8-1.2m, each set containing 4-6 through holes with a diameter of 8-12mm; an inner pipe, coaxially inserted inside the outer pipe, with grouting holes on its wall corresponding to the grouting openings on the outer pipe, and a grouting pipeline connected to the top of the inner pipe; and a double-plug grouting assembly, consisting of an upper grouting plug and a lower grouting plug that can move axially along the inner pipe, and a rubber sleeve fitted over the outer pipe. This invention, through double sealing and precise positioning, effectively solves the problems of cross-layering, backflow, and grouting blind spots, improving the rate of soil strength compliance after reinforcement; it shortens the operation time through dynamic displacement, increasing the grout utilization rate to over 80%, and is adaptable to variable-length grouting in soft / hard soil layers.

The invention discloses a stabilized soil scouring protection scheme decision-making method. The method comprises the steps of S1, determining key design parameters of a stabilized soil protection scheme; s2, an equation that the pile foundation solidified soil protection structure reaches the scouring balance state is established; s3, the relation between the solidified soil strength and the erosion protection measure failure probability is established; s4, establishing a relationship between the curing range and the erosion protection measure failure probability; s5, determining a curve that the economic cost of the stabilized soil protection scheme is increased along with the stabilized soil strength and the solidification range; and S6, determining a failure probability value of the solidified soil protection scheme, and further determining an optimal scheme of solidified soil protection. The method can effectively guide the optimization design of the anti-scouring scheme of the solidified soil.

The utility model discloses a foam light soil strength testing device, which comprises a box body, a movable plate and an objective table, the middle part of the upper surface of the box body is fixedly connected with an abutting oil cylinder, a telescopic rod of the abutting oil cylinder is fixedly connected with a pressure applying table, the upper surface of the box body is fixedly connected with a motor I through a protective shell, and sliding chutes I are symmetrically formed in the side surfaces in the box body; a first sliding block is fixedly connected to the position, opposite to the first sliding groove, of the side face of the moving plate, a first groove is formed in the side, away from the first sliding block, of the moving plate, a second screw rod is movably connected to the first groove through a bearing, and the first moving block is slidably connected into the first groove through the second screw rod in threaded connection. The objective table is fixedly connected to the bottom of the box body, a third groove is formed in the upper surface of the objective table, and a second sliding groove is formed in the lower end of the side face of the third groove. According to the foam light soil strength testing device, foam light soil to be tested can be conveniently fixed, and the accuracy of a test result is ensured.

This invention relates to a method, system, equipment, and medium for determining the degree of weakening of passive soil strength in a foundation pit. The method includes: determining multiple target locations within the passive zone of the foundation pit and obtaining the first strength parameters of the soil at each target location before excavation; defining the weakened area within the passive zone, then obtaining and sampling multiple geological parameters within the weakened area to obtain multiple parameter samples; using a numerical analysis model to calculate the calculated deformation value corresponding to each parameter sample after excavation, thereby constructing a surrogate model; obtaining the actual deformation value of the support structure after excavation, using the surrogate model to obtain the geological parameters corresponding to the actual deformation value, and then using a finite element model to calculate the excavation of the foundation pit to obtain the second strength parameters of the soil at each target location after excavation; and obtaining the degree of soil weakening in the passive zone of the foundation pit after excavation based on the first and second strength parameters of each target location.

The application discloses a method for obtaining soil strength indexes based on soil layer geophysical prospecting data, and comprises the following steps: S1, obtaining the test depth and equivalent shear wave velocity of different measuring points in a target site; obtaining the drilling samples of each measuring point at the corresponding depth, obtaining the corresponding internal friction angle and soil type; preprocessing the collected data to obtain a comprehensive data set; S2, selecting the test depth and equivalent shear wave velocity in the comprehensive data set as basic features, constructing derived features, performing feature standardization, and obtaining a data set; dividing the data set into a training set and a test set; S3, based on the training set obtained in S2, optimizing and training the soil classification model and the internal friction angle prediction model; S4, obtaining the soil strength index internal friction angle based on the soil classification model and the internal friction angle prediction model obtained by the training in S3. The method of the application realizes high-precision prediction of soil strength indexes by constructing derived features and introducing physical range constraints.

This utility model discloses a strength testing device for reinforced and solidified saline soil, relating to the field of saline soil strength testing technology. It includes a base, and further includes: a first bracket fixed to the top of the base, a support frame fixed to the top of the first bracket, a vertically installed tank on the inner wall of the support frame, a sealing cap on the top of the tank, a driving assembly on the top of the tank, and a scraper and stirring blades respectively installed inside the tank. The beneficial effects of this utility model are: the stirring blades inside the tank are driven to rotate by the driving assembly, which can fully stir the saline soil, ensuring uniform mixing of the saline soil and reinforcement materials, making the physical properties of the saline soil sample consistent, laying the foundation for accurate strength testing. Simultaneously, the synchronous rotation of the scraper can prevent saline soil from adhering to the inner wall of the tank, ensuring efficient and complete stirring, avoiding insufficient stirring due to material residue, and improving stirring quality.

The present application belongs to the technical field of ocean engineering, and relates to a telescopic self-installation dynamic penetrometer, an operation method and application thereof to seabed soil strength parameter calculation. The present application overcomes the defect of insufficient penetration depth of the dynamic penetrometer, provides soil reaction force by setting extendable blades inside the lower booster and the upper booster, and realizes continuous penetration of the dynamic penetrometer in seabed soil by relying on motor driving. The present application basically does not change the weight of the dynamic penetrometer, and has no special requirements for the survey ship; measurement in any depth range can be realized, and the application prospect of the dynamic penetrometer is greatly expanded. The present application also proposes a seabed soil strength parameter interpretation method based on the measurement data of the dynamic penetrometer, which can interpret the seabed soil strength parameters in the stage of high-speed penetration of the dynamic penetrometer into seabed by relying on self-weight and the stage of continuous penetration of the dynamic penetrometer into seabed by relying on motor, and provides a basis for marine geotechnical engineering design.

The application discloses a kind of utility evaluation and proportioning optimization method of solid waste in silt soft soil treatment in the technical field of inorganic composite material.The method comprises the following steps: S1: carry out pH value test and x fluorescence test to the industrial solid waste to be used, the industrial solid waste to be used is divided into two categories: I is silicon aluminum base waste residue or alkaline waste residue, II is gypsum base waste residue;S2: construct the strength prediction model of pure cement silt solidified soil, and carry out coefficient calibration;S3: based on the strength prediction model of pure cement silt solidified soil, construct the strength prediction model of waste residue base silt solidified soil, and carry out coefficient calibration;S4: according to waste residue base silt solidified soil strength prediction model, the proportioning of each type of waste residue is optimized and adjusted.The utility evaluation and proportioning optimization method based on the strength prediction model of waste residue base silt solidified soil can not only realize the rapid and effective evaluation of silt solidified soil strength under different waste residue proportioning, but also optimize the waste residue proportioning in solidified silt soil.

The utility model relates to the technical field of unsaturated soil strength and deformation characteristic testing, and discloses a soil triaxial nuclear magnetic combined testing device which comprises a base frame, a pressure chamber structure, a pressurizing structure and a nuclear magnetic tester, the pressure chamber structure is installed on the base frame, and a pressure chamber used for containing a soil sample to be detected is formed in the pressure chamber structure; the pressurizing structure is mounted on the base frame, and the output end of the pressurizing structure is inserted into the pressure chamber to apply axial pressure to the to-be-detected soil sample; the pressure chamber structure is sleeved with the nuclear magnetic tester, and the detection end of the nuclear magnetic tester right faces the pressure chamber. According to the structure, the nuclear magnetic tester, the pressure chamber structure, the pressurization structure and the nuclear magnetic tester are integrated, the sealing performance is better, real-time online detection is facilitated, and the influence of the pressurization structure on nuclear magnetic detection is reduced. And the diameter of the pressure chamber structure is reduced, so that the pressure chamber structure can be placed in a nuclear magnetism tester, and both nuclear magnetism test and triaxial experiment are met.

The invention provides an environment-friendly degradable device and method for rapidly improving the strength of soft soil, aims to rapidly improve the strength of complex sensitive soft soil, can achieve the effects of reducing construction disturbance, isolating deformation and protecting adjacent important buildings and structures, and relates to the technical field of civil traffic water conservancy construction. According to the method, a polylactic acid (PLA) material is hot-melted to be in a molten state, a soil body is preheated, and the moisture content and temperature of the soil body are controlled in real time. A plasticizer is added into polylactic acid to improve the fluidity of the polylactic acid, a specially-made grouting nozzle is used, the polylactic acid in a molten state is injected into a to-be-reinforced area and fully stirred with soft soil till the polylactic acid and the soft soil are mixed evenly, the soil body is compacted after stirring is completed, and the targeted reinforcing effect of the soft soil can be achieved after the soil body is cooled to the normal temperature. The invention has the advantages of greenness, degradability, rapid formation of strength, micro-disturbance and the like.

The invention discloses a cohesionless soil damage ratio strength theory-based strength prediction method, which comprises the following steps of: establishing a strength criterion general expression of cohesionless soil in a triaxial compression stress state on the basis of a strain decomposition hypothesis and a unit energy consumption rate extreme value calculation model; converting the principal stress into a generalized stress parameter, and substituting the generalized stress parameter into a general expression of the strength criterion to obtain a generalized stress form of the strength criterion; establishing a damage ratio expression based on cohesionless soil strength envelope surface characteristics, and determining a corresponding empirical coefficient according to the cohesionless soil type to obtain an optimized strength criterion; and substituting the stress parameter of the target cohesionless soil into the optimized strength criterion, calculating to obtain a strength prediction value of the cohesionless soil, and verifying the prediction precision in combination with true triaxial test data. According to the method, low, medium and high full confining pressure ranges are covered, the plastic flow characteristics and the internal friction angle change rule of the cohesionless soil are accurately reflected, and high-precision strength prediction of the cohesionless soil under the complex stress condition is achieved.

The invention relates to the field of geotechnical engineering in-situ investigation, in particular to a CPTU test device capable of simultaneously measuring vertical and transverse soil parameters and a control method.The CPTU test device comprises a metal shell, a sealing top cover is arranged at the upper end of the metal shell, a watertight connector is arranged on the sealing top cover, and the watertight connector is connected with an external probe rod; a water permeable stone is arranged at the lower end of the metal shell, a conical tip probe is arranged below the water permeable stone, a transverse probe hole is formed in the metal shell, and a power source, a controller, an inertial sensor, a side friction resistance sensor, a small transverse CPTU, a flexible silicon rubber sleeve, a waterproof clamp, a conical tip resistance sensor and a pore pressure sensor are arranged in the metal shell from top to bottom. According to the scheme, under the condition that one set of equipment is used, vertical and transverse (horizontal) soil body strength tests are carried out at the same time, and the anisotropy condition of the soil body is accurately revealed while the cost is saved.

The invention discloses a frozen soil excavation oil way which comprises a reciprocating plunger pump oil way, a bucket oil cylinder oil way, a main pump, a reciprocating plunger pump oil way and a bucket oil cylinder oil way, the main pump is attached to a working device, the reciprocating plunger pump oil way comprises a reciprocating plunger pump, and the reciprocating plunger pump is connected with the main pump through a control valve; the bucket oil cylinder oil way comprises a bucket oil cylinder, and the bucket oil cylinder is connected with a connecting rod through a rocker and connected with the main pump through a main valve. One end of the connecting rod is connected with a bucket, and an oil way of the reciprocating plunger pump and an oil way of the bucket oil cylinder are arranged in parallel. Under the condition that the soil strength and hardness are enhanced, the shoveling and digging capacity of stones and frozen soil can be enhanced; under the working condition of viscous substances (sludge and snow), the dumping speed of the viscous substances (sludge and snow) is increased, sandy soil, sludge, snow, garbage and the like are vibrated and tamped, and the working efficiency is improved.