3 results about "Strength theory" patented technology

The application discloses a recycled aggregate crushing simulation and optimization method based on a DEM particle crushing algorithm, which is based on the Griffith strength theory and the discrete element method, realizes efficient and accurate simulation of particle crushing behavior through single-particle three-dimensional stress calculation, crushing criterion establishment, fracture surface construction based on a contact point origin and sub-particle attribute inheritance, and forms a method from parameter calibration to dosage quantification; the application quantifies the maximum dosage of recycled aggregate under different highway grades and base types by revealing the mesoscopic mechanism that recycled mortar is similar to natural crushed stone in mechanical properties and recycled bricks have a decisive control on the crushing value of the mixture, and provides a theoretical reference and practical guidance for the resource high-value utilization of building solid waste recycled aggregate in road bases.

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 present application belongs to the technical field of geotechnical engineering and geological engineering, and particularly relates to a method for predicting and calculating loess active earth pressure when the ground surface is inclined behind a wall. The present application obtains the parameter values of the shear strength, normal stress, cohesion strength, internal friction angle, tensile strength and loess unit weight of the loess to be predicted; establishes a joint strength envelope, establishes a shear strength-normal stress rectangular coordinate system and solves a stress Mohr circle equation; according to the stress Mohr circle equation, the predicted value of the loess active earth pressure is obtained, and the predicted value of the loess active earth pressure is applied to the design of loess slope and retaining wall engineering in five steps. The predicted and calculated value of the loess active earth pressure based on the joint strength theory is more in line with the engineering practice, is safer, and has a practical guiding value for the design of loess area engineering support.