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Side direction high stress cracking rock intensity determination method

A fractured rock mass and a technology to determine the method, applied in the direction of applying stable shear force to test the strength of materials, special data processing applications, instruments, etc., can solve the problems of failure to meet the minimum requirements of engineering design, high experimental costs, and expensive engineering costs, etc. problems, to achieve significant economic benefits, easy promotion and use, and low cost

Inactive Publication Date: 2008-07-09
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If conventional methods such as direct shearing are used to determine the shear strength of rock mass on site, the experimental cost is high, the engineering cost is expensive, and it takes a long time, and the experimental samples are limited, which cannot meet the minimum requirements of engineering design.

Method used

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  • Side direction high stress cracking rock intensity determination method
  • Side direction high stress cracking rock intensity determination method
  • Side direction high stress cracking rock intensity determination method

Examples

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Embodiment 1

[0061] The rock mass is fine phyllite, the structure of the rock mass is "very massive", the surface of the rock mass is smooth and moderately weathered, the surface condition is "relatively good", and the uniaxial compressive strength σ of the complete rock mass is known c =85Mpa, from the rock type constant m of fine phyllite in Table 1 I =10, it can be determined from Table 2 that the geological strength index GSI of this rock mass is 45, and m b = m I exp[(GSI-100) / 28]=1.40245

[0062] s=exp[(GSI-100) / 9]=0.002218, α=0.5

[0063] Establish the Hoek-Brown criterion for this rock mass:

[0064] σ 1 = σ 3 + 85 0.0165 σ 3 + 0.002218 - - - ( 5 )

[0065] For this formula in σ3 ∈[0.25σ c , σ c ]=[22,85] ...

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Abstract

The invention relates to mining engineering, which belongs to a simple method for determining shear strength of large-size fractured rock under the action of lateral high stress and constant-confining-pressure triaxial compressive strength of fractured rock. The method is characterized in that the invention comprises the following steps of: testing the uniaxial compressive strength of a small sample block of an intact rock on a large-size fractured rock body, determining the type constant of the rock body to be detected, evaluating geological strength index of the rock body, constructing Hoek-Brown criterion and Mohr-Coulomb criterion of the rock body, and analyzing to obtain the shear strength under the action of lateral high stress and the constant-confining-pressure triaxial compressive strength of fractured rock. The invention can significantly reduce the in-situ strength test cost of large-size fractured rock and can obtain the shear resistance and the constant-confining-pressure triaxial compressive strength of large-size fractured rock without using special rock strength test equipment. The invention has the advantages of low cost, simple implementation method, and practical value in determining strength parameters of deep fractured rock.

Description

technical field [0001] The invention relates to mining engineering, and belongs to a simple method for determining the strength of a large-volume fissure rock mass. technical background [0002] The simple method for determining the strength of a large-volume fractured rock mass under the action of high lateral stress involved in the present invention has not yet been reported in relevant patent literature. In the literature (Hoek E, Brown E.T.Practicalestimates of rock mass strength "Int. J. Rock Mech. and Min. Sci", 1997, 34 (8): 1165-1187), although the concept of rock mass geological strength index is proposed, However, only the final results are listed on how to determine the strength of the fractured rock mass, and no specific implementation methods and processes are mentioned. And there is no method for determining the strength of fractured rock mass under the action of high lateral stress. [0003] The shear strength of rock mass refers to the ability of rock mass ...

Claims

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Application Information

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IPC IPC(8): G01N3/24G06F17/00
Inventor 韩凤山杨菊英
Owner DALIAN UNIV
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