Prediction method for uniaxial compressive strength of rock
A technology of uniaxial compressive strength and prediction method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of cost, easy to break, and unreasonable economy, and achieve the effect of easy operation
Pending Publication Date: 2021-09-28
HUNAN UNIV OF SCI & TECH
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Problems solved by technology
[0002] The uniaxial compressive strength of rock is an important parameter of rock. Traditionally, to obtain the uniaxial compressive strength of rock, it is generally necessary to prepare a complete cylindrical rock sample, and use a uniaxial testing machine to carry out fracturing experiments on the cylindrical sample. , so as to obtain the uniaxial compressive strength of the rock. Using this method to obtain the uniaxial compressive strength of the rock requires a complete rock sample, and it needs to cost a lot of rock sample preparation and testing costs. From an economic point of view, it is not good. reasonable
At the same time, for rocks with a high degree of fracture development and high brittleness, they are easy to break during the drilling and preparation of rock samples, which increases the difficulty of testing the uniaxial compressive strength of rocks.
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[0061] First of all, collect relevant experimental data on the rebound value of the L-shaped Schmidt hammer and the uniaxial compressive strength of the rock, and organize the experimental data in the literature to provide a data basis for the later model establishment. Through data collection, a total of 716 sets of data were collected, of which 66.7% of the experimental data (477 sets of data) were used for the establishment of the model, while the remaining data (239 sets of data) were used for the validation of the model.
[0062] Then based on the existing experimental data, a random forest prediction model is established, the steps are as follows:
[0063] Step 1: Determine that the number of separation points of the data is 50, the depth of the number is 20, and the random forest model is composed of 25 trees. According to the collected data, according to the maximum and minimum values of the L-shaped rebound value, 50 points are evenly interpreted between the maximum...
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Abstract
The invention discloses a prediction method for uniaxial compressive strength of rock. The method comprises the following steps: collecting an L-shaped Schmidt hammer rebound value of the rock and corresponding uniaxial compressive strength of the rock; based on the L-shaped Schmidt hammer rebound value and corresponding uniaxial compressive strength data of the rock, establishing a random forest prediction model, and calculating prediction precision; and based on the established random forest prediction model, substituting the tested L-shaped Schmidt hammer rebound value into the prediction model, and calculating the rock uniaxial compressive strength of the rock. According to the method, related data of the L-shaped Schmidt hammer rebound value and the uniaxial compressive strength are collected, the random forest prediction model for predicting the uniaxial compressive strength of the rock based on the L-shaped Schmidt hammer rebound value of the rock is established, by testing the L-shaped Schmidt hammer rebound value of a rock sample, based on the established random forest prediction model for the uniaxial compressive strength of the rock, prediction of the rock uniaxial compressive strength is realized without preparing a complete rock sample, and the method is suitable for the field of calculation and prediction of the uniaxial compressive strength of the rock.
Description
technical field [0001] The invention relates to a method for predicting rock uniaxial compressive strength. Background technique [0002] The uniaxial compressive strength of rock is an important parameter of rock. Traditionally, to obtain the uniaxial compressive strength of rock, it is generally necessary to prepare a complete cylindrical rock sample, and use a uniaxial testing machine to carry out fracturing experiments on the cylindrical sample. , so as to obtain the uniaxial compressive strength of the rock. Using this method to obtain the uniaxial compressive strength of the rock requires a complete rock sample, and it needs to cost a lot of rock sample preparation and testing costs. From an economic point of view, it is not good. reasonable. At the same time, for rocks with a high degree of fracture development and high brittleness, they are easy to break during the drilling and preparation of rock samples, which increases the difficulty of testing the uniaxial compr...
Claims
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IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 王敏万文赵延林
Owner HUNAN UNIV OF SCI & TECH