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Preparation method of columnar jointing basalt undisturbed rock core

A columnar joint and basalt technology, applied in the field of geotechnical engineering, can solve problems such as disturbance, poor core success rate, and inability to reflect the real mechanical properties of rock samples, so as to reduce impact disturbance and avoid disturbance damage

Inactive Publication Date: 2019-04-16
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of columnar joints, it is difficult to obtain a complete basalt core on site. Even if it is obtained, it contains a large number of joint fissures, which cannot truly reflect the true mechanical properties of basalt. Therefore, obtaining the original core of columnar jointed basalt reveals its True mechanical properties, with high practical and engineering application value
[0006] Due to the cutting effect of columnar joints, the cross-section of basalt columns is usually a regular polygonal long column, such as square, pentagonal, and hexagonal prisms. Due to the influence of physical effects such as processing and cutting, the success rate of the processed core is poor, and it is severely disturbed, which cannot reflect the real mechanical properties of the original rock sample.

Method used

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  • Preparation method of columnar jointing basalt undisturbed rock core
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  • Preparation method of columnar jointing basalt undisturbed rock core

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Embodiment Construction

[0028] Refer to attached picture. The method for preparing the original core of columnar jointed basalt of the present invention comprises the following steps:

[0029] (1) Excavation of sampling holes

[0030] Select the area where columnar joints and groundwater develop at the same time, excavate 100 sampling holes, the diameter of the hole is not more than 3m, and the depth is 5-10m, which can meet the work of construction personnel and the placement of sampling equipment, see figure 1 .

[0031] (2) Freeze construction

[0032] As long as the natural water content of the formation is greater than 10%, and the groundwater flow or infiltration velocity is less than 10m / d, freezing construction can be used in the area of ​​the sampling hole.

[0033] In order to facilitate the construction and ensure the freezing effect, the sampling area is generally set on the bottom plate of the sampling hole. The sampling area 2 contains columnar jointed basalt rock mass with relative...

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Abstract

The invention provides a preparation method of a columnar jointing basalt undisturbed rock core. The preparation method comprises the following steps that (1) an area where columnar joints and underground water are developed at the same time is selected, and a sampling hole is excavated; (2) freezing construction is carried out; (3) sampling is carried out; (4) chemical erosion is carried out; and(5) the rock core is prepared. According to the preparation method, composition components and high-temperature sensitivity of basalt are fully utilized, a freezing method is adopted to ensure that alarge-scale columnar joint rock mass is obtained, and the internal initial structural features are effectively retained; and meanwhile, the joint surface is weakened by adopting a chemical method instead of a physical method, so that disturbance damage to the rock mass is avoided. According to the preparation method o the columnar jointing basalt undisturbed rock core, impact disturbance on the rock core can be effectively reduced, and the undisturbed original rock core is guaranteed to be obtained to the maximum degree.

Description

technical field [0001] The invention relates to geotechnical engineering for the construction of columnar joint basalt areas, including underground caverns, slopes, tunnels (roads), dam foundations, etc., and can be applied to water conservancy, hydropower, transportation, mines, nuclear waste storage, underground laboratories, etc. The field of geotechnical engineering with higher requirements for rock conditions. Background technique [0002] Basalt has the characteristics of hard, relatively complete, strong weathering resistance and high strength. However, columnar joints are commonly developed in basalt. As a special structural rock mass, the columnar jointed rock mass exhibits typical anisotropy, discontinuity and heterogeneity in its mechanical behavior due to the existence of the columnar joint structure, which leads to a decrease in the quality of the rock mass and seriously affects Design and construction of geotechnical engineering. [0003] Columnar joint stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/08G01N1/32
CPCG01N1/08G01N1/32
Inventor 刘宁陈建林石安池褚卫江陈平志
Owner POWERCHINA HUADONG ENG COPORATION LTD
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