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Testing device and method for osmotic gradient of anisotropic rock mass

A technique of permeability gradient and anisotropy, which is applied in the directions of measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problem that the stability of underground engineering has a huge impact, cannot represent the permeability characteristics of on-site rock mass, and is very difficult to solve. Difficult to popularize and apply and other issues, to avoid large-scale pressure water testing in the region, reduce technical difficulty and test costs

Inactive Publication Date: 2016-10-26
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

A large number of engineering practice and scientific research also show that seepage of rock mass has a great influence on the stability of underground engineering, and it is one of the main causes of geotechnical engineering accidents. Seepage stability directly determines the economy, safety and reliability of the project, but The current test method has not realized the accurate test of the permeability gradient of anisotropic rock mass
In the existing permeability gradient test in anisotropic rock mass, the conventional pressure water test can no longer meet the requirements because the rock mass is regarded as isotropic and the anisotropy of the rock mass is not considered.
If regional testing is carried out, not only the test steps are more complicated, but also the cost is high, so it is difficult to popularize and apply in engineering
If the indoor test method is used, it cannot reflect the real fracture network of the rock mass, and the test results cannot represent the permeability characteristics of the rock mass on site

Method used

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  • Testing device and method for osmotic gradient of anisotropic rock mass
  • Testing device and method for osmotic gradient of anisotropic rock mass

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Embodiment Construction

[0034] Refer to attached picture.

[0035] The anisotropic rock mass permeability gradient testing device of the present invention comprises a reinforced concrete bottom plate 1 arranged on a test site, and a pressurized water hole 2 is arranged in the center of the test site, and the depth of the pressurized water hole 2 is 8-10m. In this embodiment, 8m is used, and a plug 3 is arranged between the orifice of the pressurized water hole 2 and the bottom plate 1, and seepage holes 4 are arranged around the pressurized water hole 2 at intervals of 45°. The bottom of 4 is provided with a piezometer 5, and the periphery of the pressure hole 4 is arranged with curtain grouting holes 6, and the curtain grouting holes 6 are distributed in a ring shape.

[0036] While adopting the above technical solution, the present invention can also adopt or combine the following further technical solutions: the depth of the pressure seepage hole 4 is smaller than the depth of the pressure water h...

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Abstract

The invention provides a testing device for an osmotic gradient of an anisotropic rock mass, comprising a concrete bottom plate and a water pressing hole, wherein a plug is arranged between the water pressing hole and the bottom plate; an osmotic pressure hole is distributed at the periphery of the water pressing hole in an annular direction; an osmometer is arranged at the bottom of the osmotic pressure hole; a curtain grouting hole is distributed at the periphery of the osmotic pressure hole. The invention further provides a testing method for the osmotic gradient of the anisotropic rock mass, comprising the following steps: selecting a testing site; arranging the site; carrying out drilling construction; burying the osmometer; carrying out a water pressing test and calculating a result. The disadvantage that a previous single-hole water pressing test is limited to an isotropic rock mass is overcome; meanwhile, the disadvantage of carrying out a regional large-range water pressing test is also avoided, and technical difficulties and testing cost are reduced.

Description

technical field [0001] The invention relates to underground engineering with prominent anisotropy of rock mass under the action of high water head. Background technique [0002] Fractured rock mass is an extremely complex medium, a geological body formed after complex tectonic movements, weathering, dissolution and unloading, etc., and is composed of complete rock blocks and discontinuous structural planes. Structural planes include macro-discontinuous structural planes such as faults, dislocation zones, joints, and fissures, as well as micro-cracks (hidden cracks) inside rocks. Different from porous media such as sand and soil, the permeability of fractured rock mass is mainly controlled by structural planes. Although intact rock blocks are also porous media, they are composed of fine particles, their material structure is hard and dense, their porosity is small, and their permeability is very weak. . The fissures in the rock mass have extremely strong water conductivity ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0806G01N15/0826
Inventor 刘宁张春生潘益斌
Owner POWERCHINA HUADONG ENG COPORATION LTD
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