Three-dimensional discrete meta-representation method of rock mass random structure surfaces

Abstract

The invention discloses a three-dimensional discrete meta-representation method of rock mass random structure surfaces. The method includes the steps: firstly, determining equivalent radiuses of the random structure surfaces based on three-dimensional network numerical model ranges of the needed rock mass random structure surfaces, and setting radius threshold values; secondly, sequentially generating the structure surfaces in 3-DEC (three-dimensional discrete element software) for the structure surfaces needing modeling according to the sequence of the equivalent radiuses from large to small,and hiding blocks non-intersected with the structure surfaces before generation of the structure surfaces; finally, dividing the same structure surface into a real structure surface portion and a virtual structure surface portion, giving different mechanical parameters to the two portions to accurately define real boundaries of the structure surfaces. The structure surfaces with the radiuses smaller than the threshold values are not modeled. According to the method, one real structure surface only needs to be cut once, so that the quantity of virtual structure surfaces is decreased at the utmost, calculating efficiency is greatly improved, and calculation errors caused by difficult valuing of deformation parameters of the virtual structure surfaces are overcome.

Description

technical field [0001] The invention relates to the technical field of rock mass structure modeling, in particular to a three-dimensional discrete element characterization method for rock mass random structural planes. Background technique [0002] Both laboratory test results and engineering practice experience show that rock mass structure plays a decisive role in rock mass mechanics, hydraulic properties and behavior. Among them, the random structural plane of rock mass that is equivalent to or slightly smaller than the engineering scale is a problem that should be focused on. In order to fully understand the random structural plane of the rock mass in the engineering area, it is necessary to calculate some structural plane characteristics or a certain comprehensive index based on the measurement and analysis of the random structural plane, which requires a three-dimensional network simulation of the random structural plane. At present, the Monte-Carlo method is the most...

AI Technical Summary

Problems solved by technology

The current problem is that the application of 3D network simulation of random structural planes only stays at the geometric or graphic level. Since mechanical calculations cannot be bypassed to truly solve rock mass engineering problems, research on how to effectively convert the 3D network simulation of random structural planes into The calculation model of rock mechanics is of great significance

If a real structural surface is constructed by adding four virtual structural surfaces, a large number of cuts will cause a large number of deformed blocks, making it difficult to mesh

Or even if the meshing is successful, it will cause a large amount of unit and node data, resulting in extremely low calculation efficiency, and errors caused by constant stress units, contact judgment algorithms, contact mechanics algorithms, etc. for slightly irregular units , will result in low-precision calculation results

[0005] (2) The inaccuracy of the scale of the real structural surface and the difficulty in obtaining the value of the deformation parameters of the virtual structural surface will lead to the distortion of the calculation results, making it difficult to apply to rock mass engineering

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