Establishment method of uniaxial compressive strength curve of sandy mudstone
A technology of uniaxial compressive strength and establishment method, applied in the field of sandy mudstone, can solve problems such as difficult to give compressive strength test method
Active Publication Date: 2020-04-28
SHAANXI SCI TECH UNIV
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Problems solved by technology
Affected by the natural and geographical environment of the area, the physical and mechanical characteristics of mudstone in different regions are quite different. Tertiary sandy mudstone is widely distributed in Ningxia, my country. A large number of engineering accidents in the area have shown that sandy mudstone meets water. Afterwards, the dry density and water content will change, but it is difficult to give a test method for the relationship between the compressive strength and the above dry density and water content
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[0020] The establishment method of sandy mudstone uniaxial compressive strength curve of the present invention, this establishment method comprises the steps:
[0021] Step 1, select the sandy mudstone in the area to be tested, and make a cylindrical sandy mudstone sample;
[0022] Step 2, measure the failure limit loading value of the sandy mudstone sample described in step 1, as the uniaxial compressive strength of the sandy mudstone;
[0023] Step 3, using the least squares method to fit the uniaxial compressive strength values measured in step 2 to obtain the relationship between water content and uniaxial compressive strength;
[0024] The relationship between the above water content and uniaxial compressive strength is: where: y 1 is the uniaxial compressive strength of sandy mudstone, w is the water content, is the correlation coefficient.
[0025] The measured uniaxial compressive strength values were fitted by the least square method to obtain the relationsh...
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Abstract
The invention discloses a method for establishing a sandy mudstone uniaxial compressive strength curve. The method comprises the following steps: I, selecting sandy mudstone in an area to be tested, and manufacturing a cylindrical sandy mudstone test sample; II, testing a damage limit loading value as uniaxial compressive strength of the sandy mudstone, of the sandy mudstone test sample in the step I; III, fitting the value of the uniaxial compressive strength tested in the step II by using a least square method, so as to obtain the relationship between water contents and the uniaxial compressive strength; fitting the value of the tested uniaxial compressive strength by using the least square method, so as to obtain the relationship between dry densities and the uniaxial compressive strength; IV, fitting the relationship between ratios (exp (rhod / w )) of different dry densities to water contents and the uniaxial compressive strength of the sandy mudstone by using the least square method, and according to a curve diagram of the relationship between the ratios (exp (rhod / w )) of the different dry densities to the water contents and the uniaxial compressive strength of the sandy mudstone, establishing mathematic expressions of the uniaxial compressive strength of the sandy mudstone based on the water contents and the dry densities.
Description
technical field [0001] The invention belongs to the technical field of sandy mudstone, and in particular relates to a method for establishing a uniaxial compressive strength curve of sandy mudstone. Background technique [0002] Mudstone is widely distributed in my country. Due to the influence of physical parameters, structural characteristics and mineral composition, its compressive strength varies greatly. Many domestic researchers have conducted more research on this. Affected by the natural and geographical environment of the area, the physical and mechanical characteristics of mudstone in different regions are quite different. Tertiary sandy mudstone is widely distributed in Ningxia, my country. A large number of engineering accidents in the area have shown that sandy mudstone meets water. Afterwards, the dry density and water content will change, but it is difficult to give a test method for the relationship between the compressive strength and the above-mentioned dry ...
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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0019G01N2203/0252
Inventor 郭瑞李彩虹
Owner SHAANXI SCI TECH UNIV