A Method for Determining the Fractal Dimension of the Peak Friction Angle of Rock Mass Structure Surface
A technology for determining the peak friction angle and its determination method, which is applied in the engineering field, can solve problems such as the absence of a method for determining the fractal dimension of the peak friction angle of the rock mass structural surface, and achieve great implementation value and social and economic benefits, good use effect, and simple operation Effect
Active Publication Date: 2016-09-14
SHAOXING UNIVERSITY
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Problems solved by technology
[0002] Before the present invention was made, there was no method for determining the fractal dimension of the peak friction angle of rock mass discontinuities
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[0020] The present invention will be further described below.
[0021] A method for determining the fractal dimension of the peak friction angle of a rock mass structural plane, comprising the following steps:
[0022] 1) Calibrate the test direction: calibrate the test direction on the selected engineering rock mass structure surface;
[0023] 2) Select the structural surface and the number of samples for the test: according to the scale of the structural surface of the engineering rock mass, select a group of structural surface sizes that do not change with the size effect (usually in the range of 300mm×300mm-1000mm×1000mm), and The structural surface of the selected size is sampled and processed; the sampling quantity of this group of structural surface samples is m, and m is a natural number not less than 3;
[0024] 3) Obtain the peak friction angle of the structural surface under the condition of two-level normal stress through direct shear test and residual friction ...
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A method for determining the fractal dimension of peak frictional angles of a rock mass structural surface comprises the following steps: 1) calibrating a test direction; 2) selecting a structural surface for test and specimen number; 3) obtaining the peak frictional angles fai1i and fai2i and the remnant frictional angle fairi of the structural surface under two stages of low normal stresses through direct shear tests; 4) obtaining first i rock mass structural surface fractal dimensions Di; 5) determining the fractal dimensions Di of the group of peak frictional angles of the structural surface, when the range of the fractal dimensions Di of the group m peak frictional angles of the structural surface is smaller than an average value 15%, viewing the range as a difference between the maximum value and the minimum value, and viewing the average value Di as the fractal dimension of the group of peak frictional angles of the structural surface. The method has the advantages of clear principles, convenience in operation, low cost, great use effect and convenience for engineering application.
Description
technical field [0001] The invention belongs to the technical field of engineering, and relates to a method for determining the fractal dimension of the peak friction angle of a rock mass structural surface, which is applicable to the peak value of the rock mass structural surface with stress effects in water conservancy, transportation, mining, geology, nuclear waste disposal, petroleum and other related projects Method for determining fractal dimension of friction angle. Background technique [0002] Before the present invention is made, there is no method for determining the fractal dimension of the peak friction angle of the structural surface of rock mass at present. The peak friction angle of rock mass structural plane is an important parameter for evaluating the stability of engineering rock mass structural plane. The direct shear test of the structural surface of the model under different normal stress conditions shows that the friction angle of the structural surfa...
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IPC IPC(8): G01N3/24
Inventor 杜时贵罗战友黄曼吕原君张晓莺雍睿
Owner SHAOXING UNIVERSITY