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Device and method for constructing fine stress field by precise principal stress

A technology of principal stress and stress field, applied in the direction of measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve problems such as fine analysis, and achieve improved accuracy, simple and refined methods, optimized complexity and The effect of precision

Inactive Publication Date: 2019-02-19
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a device and method for constructing a fine stress field with precise principal stresses, using actually accurate three principal stresses for precise construction of a fine stress field, and optimizing the complexity of multiple stress structures in space and accuracy, making up for the inability to carry out fine analysis in the inversion analysis of large-area models in traditional methods, and the direct construction of small models is too cumbersome.

Method used

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  • Device and method for constructing fine stress field by precise principal stress
  • Device and method for constructing fine stress field by precise principal stress
  • Device and method for constructing fine stress field by precise principal stress

Examples

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Embodiment 1

[0047] refer to Figure 1-4 , a device for constructing a fine stress field with precise principal stress, which includes a borehole 1 drilled inside the rock wall to be measured, and two expandable seals arranged at intervals are arranged inside the borehole 1 Blocking blocks 2, a fracturing test section 3 for testing is reserved between the blocking blocks 2, and the fracturing test section 3 is connected to the first high-pressure pump 5 through a pipeline, and a flow meter is installed on the pipeline 4. The first pressure gauge 6 and the pressure sensor 7; the pressure sensor 7 and the flow meter 4 are both connected to the digital acquisition system 8, the digital tape recorder 9 and the X-Y recorder 10 through signal lines at the same time.

[0048] Further, the depth of the borehole 1 is within the testing depth range, and its diameter is smaller than the diameter of the plugging block 2 after expansion.

[0049] Further, the blocking block 2 is connected with a secon...

Embodiment 2

[0051] The method for constructing a fine stress field device using any one of the precise principal stresses comprises the following steps:

[0052] S1. Measure the stress component of the rock wall by hydraulic fracturing;

[0053] S1.1. Seat seal: Two expandable block blocks 2 are used, placed in the selected test section through the drill pipe, and pressurized so that the block block 2 is seated on the hole wall of the borehole 1 to form The fracturing test section 3 constitutes the pressure-bearing section space, and the hydraulic pressure of the fracturing test section 3 is zero at this time;

[0054] S1.2. Fluid injection and pressurization: push the push-pull switching valve through the drill pipe, and pressurize the fracturing test section 3 with the high-pressure pump 5, so that the hole wall of the borehole 1 is subjected to increasing hydraulic pressure;

[0055] S1.3. Fracturing of the rock wall: under sufficient hydraulic pressure, the hole wall cracks along the...

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Abstract

The invention discloses a device and a method for constructing a fine stress field by a precise principal stress, which comprises a drilling, the drilling is drilled inside the rock wall to be measured, two expandable plugging blocks provided at intervals are arranged in the drilling, a length of fracturing experiment section for testing is reserved between plugging blocks, the fracturing experimental section is connected to a first high pressure pump through a pipeline, a flow meter, a first pressure gauge and a pressure sensor are installed on the pipeline; and the pressure sensor and the flow meter are respectively connected with a digital acquisition system, a digital tape recorder and an X-Y recorder are connected by signal lines. According to the device and method for constructing afine stress field by a precise principal stress, the complexity and precision of the space multiple stress structure stress fields are optimized, the shortcomings that the defects that a large area model inversion analysis in a traditional method cannot be finely analyzed, a small model is directly built, and too complicated are overcome.

Description

technical field [0001] The invention relates to a device and method for constructing a fine stress field with precise principal stress and a method for using it, which belongs to the technical field of rock tunnel engineering stress field construction, and is suitable for fine schistosimulation and fine stress field in local areas of tunnels in geotechnical engineering structure. Background technique [0002] At present, the more commonly used stress field construction method is to apply surface force and shear force through the model boundary, and then gradually adjust the magnitude of the applied force to achieve the consistency between the internal stress field of the model and the actual stress field. This method is not only cumbersome to operate, but also has a large amount of repetitive work. In most cases, the constructed stress field has a large error with the actual in-situ stress field (the shear force applied by the boundary is generally small, and the depth of in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0019G01N2203/0048G01N2203/006
Inventor 刘杰兰俊高素芳罗越文高进张罗送孙涛黎照周文俊阳菲李骁霖韩绍康周克虎姜锋武杰宾莫承林蒋旭
Owner CHINA THREE GORGES UNIV
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