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Method for theoretically calculating macro shear strength of large-scale bed rocks

A technology of shear strength and theoretical calculation, applied in the field of geotechnical engineering, can solve problems such as lack of calculation formulas, and achieve the effect of good mechanical properties

Inactive Publication Date: 2018-05-18
WUHAN UNIV
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Problems solved by technology

[0003] As for the shear strength parameters of large-scale bedrock, from the research status at home and abroad, the values ​​and sorting methods of rock mass mechanical parameters are different in different countries, but due to the lack of calculation formulas with sufficient theoretical basis, the current engineering is basically It is determined by using the test results of small-scale test blocks and relying on empirical and semi-empirical methods

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  • Method for theoretically calculating macro shear strength of large-scale bed rocks
  • Method for theoretically calculating macro shear strength of large-scale bed rocks
  • Method for theoretically calculating macro shear strength of large-scale bed rocks

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] like figure 1 As shown in , a theoretical calculation method for the macroscopic shear strength of large-scale bedrock includes the following steps:

[0027] 1) Take out a cube containing enough specimen-sized rock masses from the large-scale rock foundation As a macroscopic characteristic unit of rock mass; define a rock mass as large as a sample as a small-scale rock mass characteristic unit;

[0028] 2) Determine the mean value of small-scale friction coefficients of small-scale rock mass characteristic units based on small-scale rock mass shear test data and variance mean value of small-scale cohesion an...

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Abstract

The invention discloses a method for theoretically calculating macro shear strength of large-scale bed rocks. The method comprises the following steps of: extracting a cube (as shown in the specification) which comprises enough rock masses same as a test piece in the aspect of size from a large-scale batholith, and taking the cube as a rock mass macro feature unit; defining the rock masses same asthe test piece in the aspect of size as small-scale rock mass feature units; determining a mean value (as shown in the specification) and a variance (as shown in the specification) of small-scale friction coefficients of the small-scale rock mass feature units, a mean value (as shown in the specification) and a variance (as shown in the specification) of small-scale cohesive force of the small-scale rock mass feature units, and correlation coefficients <rho>fc between the small-scale friction coefficients and the cohesive force according to small-scale rock mass shearing test data; determining macro positive stress <sigma>n , on a dangerous sliding surface, of the rock mass macro feature unit; and calculating rock mass macro shear stress. According to the method provided by the invention,macro shear stress of large-scale bed rocks is determined according to shearing test results of small-scale rock mass test blocks, so that experiences and semi-experience performance of traditional methods are overcome, and mechanical characteristics of rock masses can be reflected more truly.

Description

technical field [0001] The invention relates to geotechnical engineering technology, in particular to a theoretical calculation method for macro-shear strength of large-scale bedrock. Background technique [0002] In water conservancy and hydropower, geotechnical and other projects, large-scale natural rock foundations are often encountered, and the specimens that people can use to test their mechanical properties are often small, and the mechanical parameters measured by the test show great dispersion. Its mechanical properties are not constant like deterministic homogeneous materials, but change with the change of spatial position. Since the strength and deformation characteristics of bedrock are extremely important influencing factors in engineering design, whether the mechanical property parameters such as shear friction coefficient and cohesive force of rock mass can be correctly selected in the design is related to whether high dams, etc. can be ensured. The safety an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 赖国伟彭俊杰
Owner WUHAN UNIV
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