14 results about "Swelling soils" patented technology

The utility model relates to the technical field of cat litter production, and discloses an automatic humidity control system for cat litter production, which comprises a shell and further comprises a frame fixed at the top of the shell, and two groups of water storage tanks are arranged at the top of the frame; the cat litter filtering device comprises a frame and a supporting block fixed to the top of the frame, a transversely-arranged water storage barrel is arranged on the inner wall of the supporting block, a filtering barrel is arranged in the water storage barrel, and one side of the filtering barrel is communicated with a transversely-arranged blow-off pipe. The device can control bentonite used for cat litter, spray water can be conveniently filtered through cooperative use of a supporting block, a water storage cylinder, a filter cylinder, a blow-off pipe and a valve, meanwhile, filtered impurities can be conveniently removed, the situation that the purity of the cat litter is reduced due to the fact that the impurities are mixed with the bentonite is avoided, and the cat litter is convenient to use. And the overall performance and the use experience are improved.

The invention discloses a method for automatically identifying cracks in the whole cracking process of high-compaction expansive soil. The method comprises the steps of preparation of a soil body, building of a drying model box, acquisition of crack images in the whole cracking process and crack identification and quantification processing. A crack image of the whole cracking process of the soil body is obtained at a short time interval; according to the method, a Python automatic file reading and data exporting function is utilized, and OpenCV fracture contour identification is combined, so that batch identification and quantification of fracture soil body images are realized, and data exporting and storage are automatically realized. The time, the water content, the fracture rate, the fracture length, the fracture entropy and the like can be recorded at the same time in combination with the change of the soil mass quality in the model box, and the fracture development condition of the whole soil mass cracking process in the two dimensions of time and water content is obtained. A crack image is analyzed by combining a PIV (particle image velocimetry) technology, micro-scale displacement of a soil body in the drying process is captured, the cracking position of the soil body is accurately captured before cracking, and the stage of crack development is distinguished according to the displacement direction.

An integrated device for measuring expansive deformation-expansive force-shear strength of expansive soil belongs to the technical field of rock-soil mechanics tests and comprises a frame assembly, a force application assembly, a water bath assembly, a shear box assembly and a monitoring assembly. The force application assembly is arranged on the frame assembly; the water bath assembly is arranged in the frame assembly; the shear box assembly is arranged in the water bath assembly; the monitoring assembly is arranged on the frame assembly and the shear box assembly. According to the integrated device for measuring the expansive deformation-expansive force-shear strength of the expansive soil, disclosed by the invention, the shear strength can be directly measured after the expansive deformation or expansive force measurement is carried out on the same expansive soil sample, and the axial expansive force and the radial expansive force can be obtained after the expansive soil sample generates certain expansive deformation; accurate data support is provided for deep research of expansive force anisotropy of expansive soil, investment of samples, equipment and time cost is greatly reduced, and mechanical properties of expansive soil in nature can be reflected more truly.

The application relates to an improved swelling soil and a preparation method and application thereof, the improved swelling soil comprising 0.4-0.8% of sugarcane residue fiber, 4-8% of biochar, 4% of cement, 0-1.25% of a pH value regulator and 85.95-91.60% of swelling soil to be improved. The application reinforces the soil structure by the sugarcane residue fiber, and restrains the deformation; the biochar is mixed to improve the water stability and structural stability of the soil; the cement is mixed to make the soil sandy and granulated, thereby improving the strength, compactness and stability of the soil; and the pH value regulator is mixed to adjust the acid-base environment of the soil, which is beneficial to subsequent ecological restoration. The application significantly improves the physical and mechanical properties of the swelling soil, effectively reduces the swelling and shrinking potential of the swelling soil, and can make the swelling soil reach an acid-base environment suitable for plant growth. Meanwhile, the solid waste is recycled, waste is turned into treasure, the preparation process is simple and feasible, and the application has good engineering application value.

The invention discloses an expansive soil slope hydrothermal control active area identification method. The method comprises the following steps: acquiring a vertical deformation time sequence of each pixel of a target area and a rainfall time sequence of a corresponding time period; processing the two groups of time sequences, and extracting periodic response characteristics representing the moisture-driven deformation process; constructing a hydrothermal transfer model reflecting a swelling soil moisture diffusion mechanism and a depth integral deformation mechanism so as to establish a physical mapping relation between theoretical prediction response characteristics and normalized active area depth; and substituting the periodic response characteristics into a hydrothermal transfer model to carry out inversion matching solution, and calculating the total depth of the active area of each pixel in combination with a pre-calibrated moisture diffusion coefficient. According to the method, the theoretical upper limit of depth inversion of a traditional single-layer time domain model is effectively broken through, and accurate physical quantitative recognition of the depth of the active area under the complex hydrothermal boundary is achieved.

The present application relates to the technical field of data prediction, in particular to a swelling soil swelling evaluation model construction method and system, comprising the following steps: collecting wetting and drying cycle data to construct closed state evolution coordinate sequence, using trapezoidal numerical integration algorithm to calculate single cycle hysteresis energy dissipation density, calculating structure damage increment to update structure integrity coefficient, constructing suction stress contribution factor and correcting real-time matrix suction, superimposing to obtain equivalent effective stress, using Lagrange interpolation combined with pore ratio relationship table to calculate pore ratio change and volume expansion rate. In the present application, the structure damage and integrity degradation are quantified by calculating the hysteresis energy dissipation value, the stress state is corrected by constructing the suction stress contribution factor, and the pore ratio change is deduced, thereby establishing a mechanical property prediction system based on energy dissipation and structure evolution, overcoming the limitations of static physical index evaluation, and significantly improving the prediction accuracy and applicability of swelling soil volume deformation.

The invention provides an expansion engineering characteristic testing system and method of expansive soil, electronic equipment and a medium. The system comprises a sleeve device, a datum point device and a water injection device, installing a sleeve device with a size corresponding to the type of the expansive soil at each basic test point on the slope surface of the side slope where the expansive soil is located; a datum point device is vertically installed at the datum point; the expansion engineering characteristic difference value between the adjacent basic test points is smaller than or equal to a preset expansion engineering characteristic difference value threshold value; when the basic test point is tested, the water injection device is connected with the installed sleeve device so as to inject water into the expansive soil; and determining the expansion engineering characteristics according to the height difference before water injection and the height difference after water injection between the top center of the basic test point and the top center of the corresponding reference point. The expansion engineering characteristic test can be carried out in situ on the expansive soil, the original structure and the real stress state of the soil body are kept, the test result is accurate and reliable, and the spatial variability of the soil body is reflected.

The invention relates to the field of slope reinforcement methods, and discloses an expansive soil slope reinforcement method based on a microorganism induced calcium carbonate precipitation technology, which comprises the following steps: slope surface treatment: surface cleaning and leveling, and grouting hole arrangement; preparing bacterial liquid: culturing sporosarcina pasteurii until the concentration is greater than or equal to 108 CFU / mL; preparing a cementing liquid: preparing urea and calcium chloride into a 1 mol / L solution according to a molar ratio of 1: 1 by using preparation equipment; alternately grouting: circularly injecting the bacterial liquid and the cementing liquid until the designed amount is reached; and maintaining and planting green: covering and moisturizing, planting vegetation, and maintaining for 28 days. According to the expansive soil slope reinforcing method based on the microorganism induced calcium carbonate precipitation technology, stirring construction equipment is simple and convenient to operate, the period can be shortened, the cost can be reduced, used strains are environmentally friendly, a stirring mechanism can move in multiple directions, and it is guaranteed that cementing liquid is evenly mixed; the gas circulation system can control the temperature, reduce sediment, guarantee the stability of the cementing fluid and effectively reinforce the expansive soil slope.

The invention discloses an expansive soil slope seepage instability prediction method and system and a monitoring and early warning device, and the method comprises the steps: selecting a typical monitoring section of a target expansive soil slope, obtaining multi-dimensional data parameters at different depths of a section slope body, constructing a seepage-structure coupling damage model, and quantitatively analyzing the internal damage accumulation of the slope, calculating an instability critical threshold through a numerical iterative algorithm, inputting real-time data into the model to calculate a current anti-slip stability coefficient and a slope displacement rate, comparing the critical threshold to determine an instability risk level, and triggering early warning; the system comprises a section selection unit, a data acquisition unit, a model construction unit, a threshold calculation unit and a prediction unit, and the units cooperate to realize data acquisition and risk determination. The device comprises a monitoring sensor group, a data receiver, a data memory, a central processing unit and an early warning trigger, and can acquire data in real time and link a multistage early warning device. According to the method, double critical threshold values and historical case correction are adopted, and the limitation of static analysis and single-parameter early warning is solved.

This invention discloses a lightweight, flexible ecological protection structure and construction method for expansive soil slopes, belonging to the field of geotechnical engineering and ecological restoration technology. The structure includes deep anchoring units, surface flexible reinforcement units, connecting units, and ecological improvement units. The deep anchoring units are anchored in stable soil and rock to provide active anchoring force; the surface flexible reinforcement units are continuously laid on the slope surface, allowing adaptive deformation to release expansion stress; the connecting units achieve flexible connections and allow for angular deflection; the ecological improvement units are filled with layered backfill of improved planting soil within the grid cells, forming a capillary barrier and providing a substrate for vegetation. This invention achieves deep integration of structural stability control, substrate improvement, and vegetation restoration through a collaborative working system of "anchor cable-grid structure-root system-soil," effectively solving the problems of instability and ecological degradation of expansive soil slopes. It is convenient to construct and environmentally friendly.

The application discloses a swelling soil slope sliding surface directional reinforcement method based on a microbial technology, relates to the technical field of geotechnical engineering, and comprises the following steps: S1, sliding surface position analysis: numerical analysis software is used to calculate the stability of a slope, and the position of the sliding surface of the slope under the action of gravity stress is predicted; S2, swelling soil preparation: swelling soil samples are selected, and first swelling soil and second swelling soil are prepared; the first swelling soil is swelling soil treated by a microorganism, and the shear strength and impermeability of the first swelling soil are higher than those of the second swelling soil; S3, layered filling and directional reinforcement: in the process of filling the slope model, the slope model is filled in layers; the first swelling soil is used to fill the region above the sliding surface, and the second swelling soil is used to fill the region below the sliding surface, so as to solve the problems in the prior art, through analysis of the position of the sliding surface, the swelling soil with higher shear strength and impermeability is used to fill the key region, and the optimization and improvement of the stability of the slope are realized.

The application provides a thermal-chemical coupling ultra-low permeability swelling soil sample rapid saturation device, which comprises a saturation device, a temperature control system, a water injection system, a water-salt conversion system, a pressure injection system and a liquid collecting device. The saturation device comprises a top cover, a base, two detachable semicircular sample chambers and a fixed outer wall, and is connected with the liquid collecting device and a solution tank through the top cover and the base respectively; the temperature control system can accommodate the saturation device; the water injection system comprises an air pump, a pressure reducing valve and a solution tank, and the solution tank is connected with the pressure injection system and the base of the saturation device through a pipeline tee joint. The application can realize rapid saturation of low permeability and swelling soil samples under different temperature and chemical solution conditions, can realize complete, high-quality and rapid demolding of the samples, can realize control of saturation time of different materials by setting the pressure injection size, can greatly reduce the time required for saturation of soil samples in soil test, can improve test efficiency, and can meet use requirements under different conditions.

The invention relates to the technical field of roadbed improvement, and discloses an improved rice hull ash mixed paving device for expansive soil roadbed filling, which comprises a frame, the bottom of the frame is connected with a lifting mechanism I, and the lifting mechanism I is provided with a stripping assembly for excavating and conveying roadbed soil; and a shunting mechanism for shunting and conveying soil is mounted on one side of the top of the stripping assembly. Rice hull ash is doped in the expansive soil roadbed, paving and compacting operation is achieved, the expansive soil is directly stripped and conveyed on the roadbed, the stripped soil is separated in a separation mode, and the stripped soil can be conveniently mixed, paved and compacted for multiple times; the roadbed is backfilled in a multi-time paving and compacting mode, so that the difficulty and the cost of transporting soil back and forth in the roadbed improvement process are reduced; the expansive soil roadbed is improved in a rice hull ash uniform doping mode, the roadbed performance is improved, waste is turned into wealth, the roadbed improvement cost is reduced, and the roadbed improvement efficiency is improved.

The application provides a prediction method and a measuring device for the relationship between lateral earth pressure and displacement of swelling soil. When measuring the lateral earth pressure of swelling soil under the condition of no displacement, a fixed block is arranged in the test device, a gradient initial constant vertical pressure is applied to the swelling soil sample for different tests, the swelling soil sample suction is gradually reduced to 0 after the sample is stable; when measuring the lateral earth pressure of swelling soil under the condition of lateral displacement, a plurality of horizontal elastic members and a plurality of horizontal displacement meters are arranged in the test device, a gradient initial constant vertical pressure is applied to the swelling soil sample for different tests, the swelling soil sample suction is gradually reduced to 0 after the sample is stable, the type of the plurality of horizontal elastic members is changed, and the test is repeated. Through fitting the test result data, the parameter value of the specific formula is determined, and then the change relationship between the lateral earth pressure of swelling soil and the lateral displacement in the humidification process is predicted.