130 results about "Loess" patented technology

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 foundation deep layer deformation observation device for a pile foundation in collapsible loess, and relates to the technical field of pile foundation deep layer observation, the device comprises a fixed shell and a control module, the upper side of the fixed shell is of a cylindrical structure, the lower side of the fixed shell is of a hemispherical structure, the lower side of the fixed shell is provided with a moving window, and the moving window is connected with the control module. A moving window is arranged in the fixed shell, a millimeter wave distance measuring module is arranged in the moving window and used for measuring the distance of the pile foundation, and a reinspection mechanism is arranged in the fixed shell and used for driving the millimeter wave distance measuring module to rotate. By means of the preset drilling hole arrangement mode, large-scale excavation, needed by a traditional method, around the pile is avoided, the purpose of implementing non-intrusive deep deformation observation on the built pile foundation is achieved, and the method has the advantage of conducting lossless observation on deep stratification deformation of the foundation.

The invention discloses a water-preserved coal mining method for water-proof soil layer reconstruction, which comprises the following steps: before coal mining, measuring the water level difference of an upper water-containing layer and a lower water-containing layer of a water-proof soil layer and the average natural permeability coefficient of the water-proof soil layer, and sealing a measured drill hole after measurement; directional drilling is carried out on the underlying stratum of the water-proof soil layer bottom plate, directional drilling holes penetrate through the coal mining subsidence area, and the horizontal sections of the directional drilling holes are located at the positions downwards away from the water-proof soil layer bottom plate; freezing in the implemented directional drill by adopting a freezing technology; vertical drilling is carried out on the ground; mixed liquid of loess and water is injected into all the vertical drill holes; the electric field set seepage field is connected through a vertical drill hole to pull the loess; after at least 10 days, performing a conventional water injection experiment on all the vertical drill holes every day, and determining the average permeability coefficient of the reconstructed waterproof soil layer; and after the standard is reached, freezing is stopped, and all the drilled holes are sealed. The method is economical, reasonable, easy to construct, free of pollution and short in effective period.

The invention discloses a loess-mudstone landslide sliding grading displacement measurement method and system, and the method comprises the following steps: collecting the multi-point displacement data of a landslide body, and carrying out the preprocessing of the data, and generating a standardized multi-measurement-point displacement data sequence; obtaining overall and local deformation states; extracting evolution trend, space consistency and sliding loss features to form a displacement feature set; inputting an improved continuous time hidden Markov landslide state model, and generating a sliding state evolution sequence; analyzing the evolution sequence to generate a grading judgment result; an included angle threshold method and a shear displacement gradient method are adopted to recognize a concave-convex body and a sliding belt, and a key area identification result is generated; and outputting a sliding grading judgment result, a displacement feature set and a key area identification result. According to the invention, fine grading identification of the landslide state and accurate locking of the key area are realized, and the accuracy and foresight of monitoring and early warning are improved.

The invention relates to the technical field of pipeline monitoring, and discloses a loess mountainous area buried pipeline landslide disaster monitoring and early warning system and method.The loess mountainous area buried pipeline landslide disaster monitoring and early warning system comprises a monitoring system module, a data transmission system module and an early warning system module; inductive factors, pipeline deformation and landslide displacement are monitored through the monitoring system module, rainfall data, deformation data and landslide displacement data are obtained, and then the monitoring data are transmitted to the early warning system module in real time through the data transmission system module. The early warning system module judges the landslide disaster risk level according to the received monitoring data and sends out an early warning signal of the corresponding level, high-precision, real-time and all-weather monitoring can be carried out on a disaster point, the micro-deformation condition of the disaster point can be mastered in time, alarming of different levels is carried out according to the deformation degree, graded monitoring, graded early warning and graded risk avoiding are achieved, and the safety of the landslide disaster is improved. And effective disaster prevention and reduction effects are achieved.

This invention discloses a system and method for testing the collapsibility coefficient of undisturbed loess. The system includes a constant-force jacking device, a humidification and maintenance device, and a collapsibility coefficient determination device. The constant-force jacking device is installed at the annular soil mass within the test hole to apply a constant horizontal jacking force to the annular soil mass. The humidification and maintenance device covers the outside of the annular soil mass to gradually humidify it and obtain its moisture content. The collapsibility coefficient determination device is connected to the constant-force jacking device and the humidification and maintenance device to determine the collapsibility coefficient or self-weight collapsibility coefficient of the annular soil mass at different moisture contents based on the jacking distance of the constant-force jacking device. This invention utilizes undisturbed annular loess in the field, eliminating the need for sampling and indoor testing to obtain the collapsibility coefficient or self-weight collapsibility coefficient. It preserves the original structure of the loess, resulting in more accurate collapsibility test results that meet the needs of engineering design and disaster management.

This invention belongs to the field of civil engineering technology in the field of flywheel energy storage in thermal power plants. It discloses a foundation treatment method for setting up flywheel energy storage devices in collapsible loess areas. The method involves excavating 2-3 meters downwards from the surface of the collapsible loess layer, then installing bored piles for the flywheel well on the surface after the first excavation. A second excavation is then carried out on the surface corresponding to the flywheel well, reaching the lower elevation of the flywheel well's bottom slab. The loose pile portion is then removed, and the flywheel well is installed above the bored piles. Backfill soil is used to the surface height after the first excavation, followed by a layer of lime-soil. A second backfill is then used to the ground floor level, and finally, a hardened ground surface is constructed. This invention features a short construction period, low engineering cost, and a foundation treatment scheme combining bored piles and lime-soil, making it particularly suitable for the characteristics of flywheel energy storage project structures.

The invention relates to the technical field of geotechnical engineering and geological disaster prevention and control, and discloses a loess slope stability calculation method considering a stress state, and the method comprises the steps: building a slope three-dimensional model according to the landform, geologic structure and rock-soil body physical and mechanical parameters of a slope; applying a load in the side slope three-dimensional model and setting boundary conditions to obtain a stressed side slope three-dimensional model; carrying out stress field solving on the three-dimensional model of the stressed side slope to obtain a global stress field of the side slope; for each collected soil sample, extracting a corresponding stress tensor from the stressed slope three-dimensional model, and determining a confining pressure condition corresponding to an indoor shear strength test; according to the confining pressure condition, an indoor shear strength test is carried out, and a soil shear strength index under the actual stress field condition is obtained; a soil sample representative horizon method is adopted, the stratigraphic position corresponding to each soil sample is analyzed, the slope stability is calculated, and the slope safety coefficient and the potential sliding surface position are obtained. Therefore, the accuracy of slope stability analysis is improved.

This invention provides a method and apparatus for designing excitation well depths in loess areas. The method includes: setting up lithological survey points in the loess-covered area; determining the depth of the moist loess interface at the lithological survey points; determining a moist loess interface model based on the moist loess interface depth; deploying preset excitation points on the moist loess interface model to obtain the predicted excitation well depth at the preset excitation points; verifying the predicted excitation well depth based on a reference thickness and correcting the moist loess interface model. This invention improves the accuracy of the moist loess thickness model, ensures that the excitation well depth at each excitation point is below the top interface of the moist loess, and improves the quality of single-shot excitation data in loess areas.

The application discloses a kind of applied loess-mudstone landslide sliding grading displacement measurement method and system, including the following steps: collecting landslide body multi-point displacement data, pre-processing generates standardization multi-measurement point displacement data sequence;Obtain overall and local deformation state;Extract evolution trend, spatial consistency and sliding loss characteristics, form displacement feature set;Input improved continuous time hidden Markov landslide state model, generate sliding state evolution sequence;Analysis evolution sequence generates grading determination result;Adopt angle threshold method and shear displacement gradient method to identify concave-convex body and sliding zone, generate key area identification result;Output sliding grading determination result, displacement feature set and key area identification result.The application realizes landslide state fine grading identification and key area accurate locking, improves the accuracy and foresight of monitoring and early warning.

The invention provides a method for simulating and judging the humidifying deformation coefficient of undisturbed loess, and relates to the technical field of geotechnical engineering.The method for simulating and judging the humidifying deformation coefficient of the undisturbed loess comprises the steps that on the basis of the undisturbed loess of a target area, a structure reinforcing component is added, preparing artificial structural loess meeting preset conditions and taking the artificial structural loess as a simulation sample; humidifying deformation tests under multi-stage pressure loads are conducted on the simulation samples with the different water contents respectively, and the humidifying deformation coefficient is recorded and determined according to the deformation stability height before and after humidifying; and constructing a loess humidifying deformation function model by taking the moisture content and the pressure load as independent variables and the humidifying deformation coefficient as a dependent variable. According to the method, the humidifying deformation of the loess in the unsaturated state can be measured, and the method has practical applicability and prediction accuracy.

The invention discloses an isotope source tracing analysis system based on fourth-century loess, and relates to the technical field of data processing. Fourth-century loess sample data is acquired and preprocessed, and a standardized data set is constructed; establishing a three-dimensional feature tensor based on the standardized data set, performing dimensionality reduction, calculating information entropy, dynamically distributing adaptive weights of all modes, weighting to obtain a coupling feature vector, and outputting the coupling feature vector and a weight distribution result; receiving a coupling feature vector and a weight distribution result, taking a multi-isotope end member value as a constraint, and outputting a contribution proportion of each potential source region through a Bayesian mixed linear model and constraint optimization solution; and receiving the contribution ratio, combining the isotope fractionation effect and a distance attenuation model, matching an optimal object source migration path by constructing a path cost function, and outputting migration path parameters. The invention provides a material source tracing analysis system which adopts multi-source indexes and is high in accuracy and high in quantification capability.

The invention belongs to the technical field of geotechnical engineering, and particularly discloses a method for synergistically improving roadbed loess in a seasonal frozen region, a product and application. The method comprises the following steps: sequentially carrying out crushing, air drying, powder sieving and drying treatment on roadbed undisturbed loess in a seasonal frozen area to obtain standby dry soil; mixing the standby dry soil with modified glass fibers accounting for 3%-11% of the mass of the standby dry soil to obtain a mixed soil material; xanthan gum accounting for 0.50%-2.00% of the mass of the mixed soil material is added into the mixed soil material, and the mixture soil material is obtained through uniform mixing; standing the mixture soil material, performing circulating freezing and thawing, and performing maintenance to obtain improved soil; and analyzing the mechanical properties of the roadbed loess under the traffic load effect based on the improved soil. The dynamic strength, the freeze-thaw resistance stability and the long-term service performance of the roadbed loess in the seasonal frozen area can be remarkably improved.

The utility model discloses a detection device for loess compaction pile compaction coefficient, including compaction density detector and shallow, be provided with the probe rod on the compaction density detector, the one side of compaction density detector is installed the operating rod, and the upper portion of shallow is installed the support rod, the utility model discloses, when using, can move shallow to the detection position of collapsible loess field, make the drill head aim at the top of detection point, through the fixed screw rod of twisting out and the rotation of holding the pole can make the drill head and the fender pipe drill into the ground, after drilling into the specified depth, can take out the drill head and connecting rod from the fender pipe, at this moment can hand the operating rod and make compaction density detector into the fender pipe, make the probe rod and the soil in the borehole contact and carry out the detection of compaction coefficient, and the fender pipe will be left in the borehole and fender in the borehole lateral wall place in the detection process, prevent the soil of borehole lateral wall to collapse to the detection point in the borehole, reduce the detection error.

This invention discloses a seismic treatment effectiveness evaluation system for thick loess sites, belonging to the fields of geotechnical engineering and earthquake engineering technology. The system comprehensively evaluates the seismic treatment effect by acquiring dynamic characteristic parameters and seismic response parameters of thick loess sites before and after seismic treatment. The system includes a site foundation parameter acquisition module, a dynamic characteristic parameter acquisition module, a loess dynamic degradation characteristic analysis module, a seismic response simulation module, a seismic treatment effectiveness quantification module, and an evaluation result output module. Specifically, it analyzes the loess dynamic degradation characteristics based on parameters such as shear wave velocity, shear modulus, and damping ratio, and acquires seismic response results such as surface acceleration, shear strain, and site amplification factor under the same seismic motion input conditions. By normalizing and weighting the dynamic degradation improvement index and the seismic response improvement index, a comprehensive seismic treatment effectiveness index is constructed, enabling quantitative evaluation and classification of seismic treatment effectiveness.

The invention discloses a reinforcing effect evaluation system for a large-thickness collapsible loess foundation, relates to the technical field of reinforcing effects, and aims to solve the problem of stress and pore pressure change distortion of monitoring points at the bottom or fixed depth. Real-time and dynamic monitoring and accurate evaluation of the whole reinforcing process of the large-thickness collapsible loess foundation are achieved, the stress evolution and settlement characteristics of the soil body are reflected through arrangement of the movable sensors at different depths and interlayer difference weight adjustment, the precision and reliability of reinforcing effect judgment are improved, and the method is suitable for large-thickness collapsible loess foundation reinforcement. On the basis of joint analysis of working condition identification and pore pressure convergence indexes, automatic distinguishing between the middle stage and the last stage of reinforcement is achieved, an optimization mechanism is arranged to ensure that the sensor is always in an effective monitoring depth, the representativeness and continuity of data acquisition are improved, and therefore accurate reinforcement effect level evaluation is provided; and a scientific basis is provided for construction management and foundation safety decision.

The invention discloses a meshless seismic wave forward modeling method based on a difference numerical method and related equipment, and belongs to the field of exploration geophysics. According to the method, flexible mesh generation is carried out based on an undulating surface seismic wave speed model, a surface interface is completely fitted, and a high-precision difference coefficient set is obtained without manually selecting deformation parameters; by adding a filter related to a second-order time item in a two-dimensional scalar time domain acoustic wave equation, the robustness and accuracy of numerical simulation are effectively improved, so that a high-precision and stable seismic wave numerical simulation result is obtained, the precision and stability of seismic data processing can be effectively improved by utilizing the method, and the seismic data processing efficiency is improved. The method provides solid technical support for loess tableland seismic wave forward modeling, and has important practical significance for evaluating the influence of the earth surface effect on exploration data in the loess tableland, improving the accuracy and reliability of the exploration data, analyzing the physical properties and change rules of underground media and simulating the physical properties and seismic wave propagation conditions of underground structures.

The application discloses a kind of for silt dam prefabricated framework-3D printing homologous composite soil and application, the composite soil is by loess, three-toed horse red soil constitutes soil matrix, sand, straw, geopolymer and biological macromolecular thickening agent are auxiliary material, prepared by using the same soil source.This application realizes material performance complementation by homologous preparation, solves the adaptability problem of silt dam prefabrication and 3D printing material from the root, relies on unique raw material combination and preparation process optimization composite soil comprehensive performance, significantly improves silt dam structure stability and durability.The composite soil can be prepared prefabricated module and 3D printing shell respectively, and the two cooperate with each other, can effectively guarantee the realization of silt dam comprehensive function, is applicable to silt dam prefabricated framework and 3D printing material application scene.

The application relates to the technical field of coal mining underground reservoir construction, in particular to a method for constructing an aboveground water storage area of an underground reservoir and a water storage system. The method for constructing the aboveground water storage area of the underground reservoir comprises site selection and pipeline installation; a coal mining subsidence area with a containing space above the ground is selected as a water storage area in a region with an underground reservoir; a connecting pipe is installed to connect the underground reservoir and the containing space, and is used for guiding water in the underground reservoir into the water storage area. The application utilizes the exposed side wall of a rock mass in a coal mining subsidence area and a loess gully area to construct a reservoir; in combination with water outlet of the underground reservoir, water purified in the underground reservoir is stored on the ground for secondary purification and ecological utilization; the application utilizes the rock mass cracks in the coal mining subsidence area as a connecting pipeline between the aboveground water storage area and the underground reservoir; the application utilizes natural topography, reduces material use and environmental pollution, saves cost and has a strong ecological effect.

The application discloses a kind of soil shear strength calculation method and device based on particle internal normal stiffness, method mainly includes: obtaining different particle normal contact stiffness corresponding shear strength parameter, obtain multiple data pairs, fitting to multiple data pairs, obtain the relationship curve of soil internal particle normal contact stiffness and shear strength parameter;The axial stress of the soil particle to be measured is obtained, the normal contact stiffness of the particle is determined, and the shear strength parameter of the soil to be measured is obtained according to the relationship curve of the soil internal particle normal contact stiffness and the shear strength parameter.The application can break through the limitation of conventional indoor soil test and soil mechanics macroscopic phenomenological research, and quickly and accurately calculate the loess shear strength parameter, to provide accurate and reliable data parameters for highway engineering high slope stability calculation.

The application discloses a loess tunnel surrounding rock pressure prediction method and system, and belongs to the technical field of tunnel construction, which can solve the problem that the prior art cannot be applied to the surrounding rock pressure prediction in water-rich loess stratum. The method comprises the following steps: performing triaxial compression tests on multiple samples of the soil body of the loess tunnel surrounding rock under different dry-wet cycle times; determining a first mapping relationship between the shear strength index of the soil body and the dry-wet cycle times and a second mapping relationship between the vertical strain of the soil body, the vertical test pressure and the dry-wet cycle times according to the test data; performing numerical simulation on the dry-wet cycle process of the loess tunnel surrounding rock under different working conditions based on the first mapping relationship and the second mapping relationship, so as to obtain the surrounding rock simulation pressure before and after the dry-wet cycle of different times under each working condition; and determining the surrounding rock prediction pressure after the dry-wet cycle of different times under each working condition according to the surrounding rock simulation pressure. The application is used for predicting the surrounding rock pressure.

This invention discloses a construction method for extra-large cross-section loess tunnels, belonging to the field of tunnel construction. The method includes a two-stage, five-step method with an inverted arch and a three-stage, seven-step method with a single core soil. The two-stage, five-step method with an inverted arch is applicable under the following conditions: elastic modulus greater than 60 MPa, moisture content less than 18%, and density greater than 1.55 and less than 1.70 g / cm³. 3 The three-step, seven-stage method for single-core soil is applicable under the following conditions: elastic modulus greater than 70 MPa, moisture content less than 15%, and density greater than 1.60 and less than 1.76 g / cm³. 3 This invention improves upon existing single-sidewall pilot tunnel methods and three-step seven-step methods, forming a two-step five-step method with inverted arch and a single-core soil three-step seven-step method suitable for extra-large cross-section loess tunnels. Furthermore, the two-step five-step method with inverted arch is suitable as a transitional method between the double-sidewall pilot tunnel method and the single-core soil three-step seven-step method, enabling the improved construction method for extra-large cross-section loess tunnels to combine safety and construction progress.

This invention discloses a comprehensive water regulation and soil conservation method for loess slopes, comprising the following steps: 1. Soil improvement of the loess slope and design of the slope structure, wherein the slope structure includes a buffer platform and a water-retaining slope; 2. Constructing drainage ditches, drainage pipes, or water storage channels on the slope in conjunction with the slope structure to collect and guide precipitation, water storage, and rainwater flow direction, and to prevent water accumulation on the slope surface. This method can store water in the bottom layer of the slope, preventing excessive water loss, effectively regulating water flow, and reducing the risk of soil erosion and slope erosion; it avoids direct scouring of the slope due to continuous water accumulation, increasing the stability and safety of the slope; by setting semi-circular protective block structures, it can reduce the erosion capacity of soil and water, regulate water flow, reduce the distance of sand flow, and improve the overall stability of the slope.

This invention relates to the field of quantitative analysis of mining-induced fracture evolution in coal and rock masses, and particularly to a method for quantitatively characterizing the distribution and evolution of mining-induced fractures in overburden in loess gully areas based on fractal theory. The method involves measuring data from the 6102 face of the Chuancaogedan Coal Mine using a measuring instrument, and then establishing a physical similarity simulation model based on the 6102 working face. Simulated excavation is performed, with the simulation data set as follows: 5# coal seam mining height 4.6m, excavation step distance 10m, model recovery length 220m; 6# coal seam mining height 12.9m, excavation step distance 10m, model recovery length 220m. Based on the results of the physical similarity simulation experiment and fractal theory, this invention systematically studies and quantitatively describes the distribution and evolution of mining-induced fractures in overburden under multiple influences in loess gully areas. This has significant theoretical and engineering implications for revealing the laws governing overburden movement and damage, achieving quantitative evaluation of the degree of overburden damage during mining, and preventing damage during working face mining.