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Device and method for researching influence of surrounding rock fracture water on buffer material erosion process

A buffer material and fissure water technology, applied in measuring devices, analysis materials, weather resistance/light resistance/corrosion resistance, etc., can solve the difficulties of water flow blocking and accurate measurement, and the difficulty of designing and developing rock fissure sample processing test devices and other issues to achieve the effect of expanding the variety

Pending Publication Date: 2021-05-28
BEIJING RES INST OF URANIUM GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using real granite cracks to reproduce the sealing of the cracks with buffer materials and the subsequent erosion process can undoubtedly best reflect the actual situation of the interaction between the buffer material and the surrounding rock in the waste disposal unit, but it is limited by the complexity of the rock crack itself and the design of sample processing and test equipment Difficulty in research and development, such experiments are rarely reported
However, using large-scale rock blocks for testing can make it easier to use optical means to measure the shape of cracks, and the processing of samples and devices is less difficult. Small cracks are relatively low, but it is more difficult to achieve water flow plugging and accurate measurement.

Method used

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  • Device and method for researching influence of surrounding rock fracture water on buffer material erosion process
  • Device and method for researching influence of surrounding rock fracture water on buffer material erosion process

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 and 2As shown, this embodiment provides a device for studying the impact of surrounding rock fissure water on the erosion process of buffer materials, including a pressure / volume controller 1, a pure water / solution converter 2, a test core, a pressurized structure and a recovery structure; the buffer material test The sample is set in the test core, the test core is set in the pressurized structure, one end of the pure water / solution converter 2 is connected with the pressure / volume controller 1, and the pure water / solution The other end of the converter 2 is connected to one end of the test core, and the recovery structure is used to recover the solution flowing out from the other end of the test core.

[0037] In this specific embodiment, the test core includes a rock 13, a blocking block 14, a water-permeable pad 5 and a sealing sleeve 7; one end of the rock 13 is provided with a crack 12 with a known opening, and the other end of the rock 13 is On...

Embodiment 2

[0046] This embodiment discloses a device method for studying the influence of surrounding rock fissure water on the erosion process of buffer materials in Embodiment 1, which mainly includes the following steps:

[0047] The first step is to select a granite core with obvious cracks running through the length direction, cut 10cm, and drill a hole from one end with a diameter of 3cm and a depth of 6.5cm; or, select a complete core, cut 10cm, and drill a φ3cm×6.5cm The hollow cavity is then cut into two identical parts along the length direction. After water is added in the subsequent steps, the water flow cannot flow along the outer surface of the rock and all flow through the cracks. At the same time, the expansion force generated by the bentonite block 6 after contacting water is much smaller than the external air pressure. without changing the opening of the crack;

[0048] The second step is to use a 3D laser scanner to obtain the surface topography of natural / artificial c...

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Abstract

The invention discloses a device and method for researching influence of surrounding rock fracture water on a buffer material erosion process, and relates to the technical field of surrounding rock fracture research. The device comprises a pressure / volume controller, a pure water / solution converter, a test rock core, a pressurization structure and a recovery structure, wherein a buffer material sample is arranged in the test rock core, the test rock core is arranged in the pressurization structure, one end of the pure water / solution converter is communicated with the pressure / volume controller, the other end of the pure water / solution converter is communicated with one end of the test rock core, and the recovery structure is used for recovering a solution flowing out of the test rock core. According to the invention, a granite core is processed into a hollow cavity, and compacted bentonite is limited to expand in the cavity; artificial fractures can be cut from a complete rock core, or a cavity for accommodating a bentonite sample is processed from a rock core with natural fractures; and underground water or a specific test solution flows in a test system, and the expansion plugging performance and anti-erosion performance of sodium bentonite under the action of granite crack water are studied.

Description

technical field [0001] The invention relates to the technical field of surrounding rock fissure research, in particular to a device and method for studying the influence of surrounding rock fissure water on the erosion process of buffer materials. Background technique [0002] As an important part of the high-level radioactive waste geological repository, one of the important functions of the buffer material bentonite is to seal the cracks in the surrounding rock. However, due to the influence of the friction force of the side wall of the crack, the bentonite that expands and squeezes into the crack of the surrounding rock decreases with the increase of the squeeze distance, and interacts with the groundwater in the crack to form a looser bentonite gel , and even free bentonite colloidal particles appear. When the shear force of the groundwater flow exceeds the erosion resistance of the bentonite gel / colloid particles, the bentonite particles will be carried away by the gro...

Claims

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Application Information

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IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 谢敬礼
Owner BEIJING RES INST OF URANIUM GEOLOGY
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