A method for determining long-term shear strength of a rock structural surface

A technology of shear strength and determination method, which is applied in the direction of strength characteristics, the use of stable shear force to test the strength of materials, and the preparation of samples for testing, etc. Application, high precision, long cycle effect

Active Publication Date: 2018-03-02
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the existing methods for determining the long-term shear strength of rock mass structural surfaces, the present invention provides a method for determining the long-term shear strength of rock mass structural surfaces. It can solve the problems of large influence of human factors and low accuracy in the existing technical evaluation methods; it can accurately obtain the long-term shear strength of rock mass structural planes

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  • A method for determining long-term shear strength of a rock structural surface
  • A method for determining long-term shear strength of a rock structural surface
  • A method for determining long-term shear strength of a rock structural surface

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Embodiment 1

[0042] Taking the sandstone of a water conservancy project in central my country as an example, based on laboratory experiments and numerical experiments, the long-term shear strength of the sandstone structural plane is determined. The specific operation steps are as follows:

[0043] a. On-site collection of sandstone rock blocks with structural surfaces, the structural surfaces are straight and rigid structural surfaces without filling; the rock blocks are cut with a stone saw machine, and then the rock blocks are cast into a cubic structural surface of 15cm×15cm×15cm with cement mortar For the sample, the structural surface is located in the middle of the cube sample;

[0044] b. First, use a rock shear instrument to conduct a conventional shear test on the sandstone structural surface sample. According to the actual vertical stress on the rock mass structural surface in the project, the normal stress σ is taken as 2.39MPa, and the sandstone structural surface is obtained. ...

Embodiment 2

[0052] Taking the marble of a water conservancy project in Southwest my country as an example, based on laboratory experiments and numerical experiments, the long-term shear strength of the marble structural plane is determined. The specific operation steps are as follows:

[0053] a. On-site collection of marble rock blocks with structural surfaces, the structural surfaces are straight and rigid structural surfaces without filling; the rock blocks are cut with a stone saw machine, and then the rock blocks are cast into a cube structure of 15cm×15cm×15cm with cement mortar Surface sample, the structural surface is located in the middle of the cube sample;

[0054] b. First, use a rock shear instrument to conduct a conventional shear test on the sample of the marble structural surface. According to the actual vertical stress on the rock mass structural surface in the project, the normal stress σ is taken as 5.41MPa, and the marble structure is obtained. The conventional shear s...

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Abstract

A method for determining long-term shear strength of a rock structural surface is provided. The method includes firstly preparing a rock structural surface sample; subjecting the sample to a shear creep indoor test to obtain a shear creep curve of the sample; determining a long-term shear strength range of the rock structural surface through a shear creep indoor test; building a shear creep modelof the sample according to the shear creep curve of the sample so as to obtain model parameters; building a numerical model of the sample according to the dimension of the sample and characteristics of the structural surface; and equally dividing the obtained long-term shear strength range into a plurality of parts as values of horizontal shear stress applied in a numerical test, and subjecting the sample to a shear creep numerical test to obtain an accurate value of the long-term shear strength of the rock structural surface. The range of the long-term shear strength of the rock structural surface is determined according to an indoor test result firstly, and the long-term shear strength of the rock structural surface is accurately obtained based on a numerical test result.

Description

1. Technical field: [0001] The invention relates to the field of rock mechanics and engineering, in particular to a method for determining the long-term shear strength of a rock mass structural surface. 2. Background technology: [0002] In water conservancy, mining, transportation, energy and national defense projects, various rock mass structural planes such as joints and weak interlayers are widely developed. The long-term shear strength of the rock mass structural plane plays a vital role in the long-term stability and safety of the project. A large number of engineering practices have shown that it is a complex nonlinear progressive process related to time from initial deformation to final instability and failure of high rock slopes, deep-buried underground powerhouses and ultra-long hydraulic tunnels. The long-term shear strength of rock mass structural planes It plays a key role in controlling the deformation, failure and instability of the project. When the applied...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N1/28
CPCG01N1/286G01N3/24G01N2001/2873G01N2203/0025G01N2203/0071G01N2203/0218
Inventor 于怀昌刘汉东徐荣超王硕楠任明浩邓绪彪潘广钊席伟其他发明人请求不公开姓名
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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