Joint friction coefficient dynamic attenuation calculation method based on DDA theory
A technology of friction coefficient and calculation method, which is applied in electrical digital data processing, design optimization/simulation, testing material strength by applying stable shear force, etc. Dynamic process stability analysis and other issues
Active Publication Date: 2020-03-27
HEBEI UNIV OF TECH
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Studying the attenuation law of the dynamic friction coefficient of discontinuities to establish a mathematical model can be better used in DDA numerical simulation to realize real-time tracking of changes in rock mass stability; the prior art does not take the attenuation of friction coefficient of discontinuity planes into account in the dynamics of landslides In the process stability analysis, factors such as peak axial pressure of rock mass and dynamic load that may affect the change of joint friction coefficient are not considered comprehensively
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[0047] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0048] This embodiment provides a method for calculating the dynamic attenuation of joint friction coefficient based on DDA theory, taking a landslide as an example, including the following steps:
[0049] S1. Obtain the initial shear parameters of the structural plane of the rock sample through the rock mechanics test.
[0050] The rock mechanics test is a routine test. A variety of lithological rocks are collected, and the square rock samples are manually cut to ensure the integrity of the cut rocks; the basic parameters of the rock samples, including the internal friction angle, are obtained through actual measurement. and cohesion c.
[0051] S2. Conduct indoor cyclic shear experiments, and use the experimental data...
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The invention discloses a joint friction coefficient dynamic attenuation calculation method based on a DDA theory. The joint friction coefficient dynamic attenuation calculation method comprises the following steps: S1, acquiring initial anti-shearing parameters of a rock sample structural plane through a rock mechanics test; S2, carrying out an indoor cyclic shear experiment, and making a shear strength ratio-shear cycle index scatter diagram by utilizing experimental data; S3, utilizing the scatter diagram manufactured in the step S2 to obtain a fitting function based on a data fitting method, and establishing a rock mass structural plane dynamic shear friction coefficient attenuation model; S4, compiling a joint friction coefficient dynamic attenuation program according to the step S3,and adding the joint friction coefficient dynamic attenuation program into the DDA code to realize numerical calculation of structural surface dynamic friction attenuation; and S5, recording the relative displacement, the cyclic shear coefficient and the relative speed of the edge-edge contact block of the DDA model block, and updating the joint friction coefficient in real time to realize numerical simulation of the dynamic friction attenuation behavior of the rock joint. According to the joint friction coefficient dynamic attenuation calculation method, the friction coefficient attenuation phenomenon caused by structural surface abrasion under the earthquake action can be simulated more truly.
Description
technical field [0001] The invention relates to the field of numerical simulation of cyclic shear failure of rock mechanics and engineering rock mass, in particular to a dynamic attenuation calculation method of joint friction coefficient based on DDA theory. Background technique [0002] Discontinuous Deformation Analysis (DDA) theory is a powerful tool for studying discontinuous media including rock mass; since it was put forward in the 1980s, it has received extensive attention from scholars in the field of geotechnical engineering. It has been applied in large and medium-sized rock mass engineering at home and abroad, and its effectiveness has been verified a lot; the research object of DDA theory is a discrete block system, and its advantage is that it can fully consider the interaction between blocks, By adding or subtracting contact springs on the block interface, the closing, opening and shearing slip of the contact surface between blocks can be simulated correctly. ...
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IPC IPC(8): G06F30/20G01N3/24G01N3/32G06F119/14
CPCG01N3/24G01N3/32G01N2203/0005G01N2203/0025Y02T90/00
Inventor 宋宜祥卢浩冉黄达杨芸芸韩闯
Owner HEBEI UNIV OF TECH