3 results about "Strength reduction" patented technology

The application discloses a kind of multi-line parallel pipeline jacking reasonable construction sequence design methods, using numerical calculation means, respectively calculate the stability safety factor K of different pipeline cover layer thickness H, different interlayer width D etc. ij Between different pipeline jacking sequence of the i-th working condition, compare the stability safety factor K of pipeline cavern ij Size, sequentially select the minimum value K ijmin Of each pipeline safety factor under the i-th working condition, compare the K ijmin Value size under different working conditions and select the maximum max [K ijmin ], the pipeline construction cavern max [K ijmin ] corresponding working condition under the pipeline construction jacking sequence of multi-line parallel pipeline is optimal jacking sequence.The application uses finite element strength reduction method to obtain the stability safety factor K of pipeline cavern, compares the stability safety factor K of cavern under different jacking sequence of working condition, and the pipeline construction jacking sequence with maximum safety factor is taken as the reasonable jacking sequence of pipeline construction under the working condition.

A method for analyzing the overtopping failure of earth-rock dams based on the material point method belongs to the field of numerical simulation technology in civil engineering and hydraulics. The steps are as follows: S1, read in the material point information for each zone, background mesh information, material constitutive models and parameters of the material points, load information of the material points, and related calculation parameters; S2, based on the material point adaptive mapping technique, update the position and momentum of the material points in each time step; S3, calculate the equivalent plastic strain of the material points, consider the fluid-solid transformation of the material points in the dam area through the strength reduction method, and update the stress of the material points according to the constitutive models of the material points in each zone; S4, repeat S2 and S3 until all time steps are completed, and output the deformation and reservoir water level changes at typical moments during the overtopping failure process of the earth-rock dam. This invention uses adaptive mapping to improve the computational efficiency of large-scale problems, effectively reflects the scouring effect of reservoir water on the dam slope during the overtopping process, and reasonably reproduces the evolution process of the overtopping failure of earth-rock dams.

The application discloses a kind of deep stage cemented filling body strength calculation method considering mining and filling timing, comprising the following steps: S1, construct the three-dimensional finite element model of underground ore body mining and filling mining and filling timing process, numerical simulation calculation is carried out;S2, the displacement cusp mutation analysis function of typical measuring point is established by strength reduction method to determine the threshold value of total displacement and safety factor, and the rationality of threshold value is verified by the displacement nephogram and stress nephogram of finite element cemented filling body numerical model, qualitative analysis;S3, by column network discrete method, the three-dimensional analysis model of cemented filling body strength requirement is reconstructed, and the volume of cemented filling body fracture surface and failure area is determined according to the threshold value of total displacement and safety factor, and finally the strength required by cemented filling body is determined.The strength of filling body determined by the method is accurate and reasonable, effectively solves the problem of filling mining safety and economic balance, and is especially suitable for the strength requirement calculation of cemented filling body of deep stage open stope subsequent filling mining method.