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Method for analyzing and predicting strength of intermittent jointed rock mass under complex stress conditions

A jointed rock mass and complex stress technology, which is applied in the direction of analyzing materials, strength characteristics, and testing material strength by applying stable tension/pressure, can solve problems that have not considered the comprehensive influence of multiple factors, and achieve the purpose of improving field engineering application value, The effect of wide application range and high prediction accuracy

Inactive Publication Date: 2020-02-21
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, most of the above studies are aimed at single-factor problems, such as only correcting and supplementing the strength of rock mass with heterogeneity, intermediate principal stress, joint geometry, or degree of fragmentation, and have not considered the comprehensive effects of multiple factors on rock mass strength. influences

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  • Method for analyzing and predicting strength of intermittent jointed rock mass under complex stress conditions
  • Method for analyzing and predicting strength of intermittent jointed rock mass under complex stress conditions
  • Method for analyzing and predicting strength of intermittent jointed rock mass under complex stress conditions

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[0043]In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the examples. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0044] Cement materials are used to make rock block samples and single non-penetrating joint rock samples. 0.2mm According to the angle between the joint axial direction and the horizontal direction, determine the joint inclination angles including 0°, 20°, 40°, 60°, 80° and 90°, a total of six categories, and use the above samples to carry out the following experiments:

[0045] Step 1. Make a rock sample, perform a uniaxial compression test, and obtain the uniaxial compressive strength σ of the rock sample c , in this example, the uniaxial compressive strength σ of the rock sampl...

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Abstract

The invention discloses a method for analyzing and predicting strength of intermittent jointed rock mass under complex stress conditions. The method comprises the following steps: acquiring the uniaxial compression strength of a rock mass sample; acquiring the uniaxial compression strength of single non-through jointed standard rock mass samples with different joint inclination angles; calculatingfitting parameters; calculating an angle correction coefficient; carrying out true triaxial compression tests on the single non-through jointed standard rock mass samples with different joint inclination angles, and acquiring the maximum principal stress, the intermediate principal stress and the minimum principal stress when the single non-through jointed standard rock mass samples are damaged;calculating a parameter A and a parameter B; and calculating the strength of the jointed rock mass. The method can effectively predict the strength of the jointed rock mass under different confining pressure combinations and joint inclination angle conditions. The prediction method has the advantages of many consideration factors, simplicity in operation, wide use range, high prediction precisionand important market application prospect.

Description

technical field [0001] The invention relates to the technical field of rock mechanics, in particular to a method for analyzing and predicting the strength of intermittently jointed rock mass under complex stress conditions. Background technique [0002] Rock mass strength is one of the important contents of rock mass mechanics research. Rock mass strength prediction, rock slope stability analysis, underground cavern stability evaluation and support design encountered in geological engineering are all related to rock mass strength. directly or indirectly related. During the diagenesis and long geological evolution process of the rock mass, a large number of primary and secondary joint surfaces have been formed. The existence of these jointed structural planes makes the strength of the rock mass significantly heterogeneous and anisotropic, and significantly affects the strength and deformation characteristics of the rock mass. In addition, engineering rock masses are general...

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Application Information

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IPC IPC(8): G01N3/08G01N3/40G01N3/06
CPCG01N3/06G01N3/08G01N3/40G01N2203/0252G01N2203/0256G01N2203/0676
Inventor 杨永涛刘学伟康永水卢兴利汪志强
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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