A method for determining the anisotropic ratio of columnar jointed rock mass based on numerical simulation

A technology of anisotropy ratio and columnar joint rock, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as incomplete filling of joints and inconsistent strength of columns, and achieve true and reliable simulation results Effect

Inactive Publication Date: 2018-12-07
HOHAI UNIV
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Problems solved by technology

Compared with the field test, the similar material model test has its unique advantages in explaining the nature and law of the problem mechanism, but there are s

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  • A method for determining the anisotropic ratio of columnar jointed rock mass based on numerical simulation
  • A method for determining the anisotropic ratio of columnar jointed rock mass based on numerical simulation
  • A method for determining the anisotropic ratio of columnar jointed rock mass based on numerical simulation

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Embodiment

[0045] The method of the present invention is described by taking the determination of the anisotropy ratio of the columnar joint rock mass of a certain hydropower station dam foundation as an example.

[0046] Step 1: Build a 3D numerical model

[0047](1) Using finite element pre-processing software to establish a three-dimensional columnar jointed rock mass numerical model and perform three-dimensional grid division, as shown in figure 2 , imported into the finite difference software;

[0048] (2) A total of 10 three-dimensional models with different column inclination angles were built, and the column inclination angle β is as follows: image 3 , β takes 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80° and 90° respectively.

[0049] Step 2: Selection of constitutive model and assignment of physical and mechanical parameters

[0050] (1) Select the strain softening model in the finite difference calculation software;

[0051] (2) The parameter list is shown in Table 1.

[0...

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Abstract

The invention discloses a method for determining the anisotropic ratio of columnar jointed rock mass based on numerical simulation, which comprises the following steps: establishing columnar jointed rock mass samples with different column dip angles through finite element software; selecting a corresponding constitutive model and providing physical and mechanical parameters required for the constitutive model; setting up the calculation conditions of the constitutive model and debugging the calculation program, and carrying out the numerical simulation of rock mass specimens with different column dip angles and different confining pressures; calculating the anisotropic ratio of columnar jointed rock mass by extracting the monitoring data in the numerical simulation process. A numerical experiment of anisotropic columnar jointed rock mass can be carried out in batches repeatedly based on numerical simulation of a continuous medium, the anisotropy of columnar jointed rock mass under different stress states is analyzed, and then the anisotropy ratio is determined conveniently and quickly. Moreover, the simulation results are more reliable based on a large number of numerical experiments, and the method has an important practical significance for the design, construction and support scheme of columnar jointed rock mass engineering.

Description

technical field [0001] The invention relates to a method for determining the anisotropy of rock mass, in particular to a method for determining the anisotropy ratio of columnar joint rock mass by means of numerical simulation, and belongs to the fields of rock mechanics and engineering, rock and soil mechanics and the like. Background technique [0002] Columnar joints are a kind of primary tensional fracture structure commonly found in basalts, which are widely distributed in Southwest China. With the development of my country's hydropower construction, more and more projects involve columnar jointed rock mass. Columnar jointed rock mass is a type of rock mass with special structural characteristics, and its mechanical properties such as deformation and strength are affected by the direction of structural planes and show obvious anisotropy. A large number of research results have shown that in the construction of structures in this kind of rock mass, the relationship betwe...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 闫龙徐卫亚王环玲李彪孟庆祥
Owner HOHAI UNIV
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