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A kind of preparation method of irregular columnar joint rock sample

A technique for columnar joints and rock samples, applied in the field of geotechnical engineering, can solve problems such as difficulty in drilling natural rock samples, rock samples without joint fissures, and disturbance of joint structure surface, etc., so as to improve the experimental yield and save experiments. cost and time, the effect of improving overall stability

Active Publication Date: 2021-02-26
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Experimental research is the most direct and effective way to obtain the mechanical properties of irregular columnar joint rock mass. However, the actual engineering site columnar joint rock mass is broken, and it is difficult to drill natural rock samples containing multiple groups of columnar joints. On the one hand, the drilled rock samples will cause excessive disturbance to the joint structural plane; on the other hand, due to the problem of laboratory scale, the rock samples usually do not contain joint fissures or only have some joint fissures, which is not representative.

Method used

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  • A kind of preparation method of irregular columnar joint rock sample
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  • A kind of preparation method of irregular columnar joint rock sample

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preparation example Construction

[0028] A kind of preparation method of irregular columnar jointed rock mass rock sample of the present invention, comprises the following steps:

[0029] (1) Select the columnar joint area to be studied, obtain the three-dimensional digital model of each jointed rock block in the irregular columnar jointed rock mass, and generate a solid mold for forming each jointed rock block;

[0030] Such as Figure 4~5 , the solid mold is spliced ​​by several individual irregular mold blocks, each mold block contains a part of the forming area of ​​the jointed rock block, and the adjacent mold blocks are spliced ​​to obtain the complete forming area of ​​the jointed rock block. Vent holes are provided at the bottom of the formed area of ​​each jointed rock block to help alleviate the problem of trapped air bubbles generated during subsequent grouting pours. Adaptive bayonets and slots can be set on the splicing surfaces of adjacent mold blocks, which is helpful for accurate positioning b...

Embodiment

[0042] The method of the present invention is described by taking the preparation of a rock-like sample of an irregular columnar jointed rock mass at an engineering site as an example.

[0043] (1) figure 1 A photograph of the exposed irregular columnar joints taken for a project site, based on the photos, the joint lines were drawn in the CAD software, and the irregular columnar joints were split into multiple jointed rock blocks;

[0044] (2) Obtain the area and geometric center point of each jointed rock block, and number the jointed rock blocks sequentially according to the area from large to small, such as figure 2 At the same time, the jointed rock blocks are classified, and those with similar areas and sizes are classified into one category, for example, numbers 1 to 5 are one category, numbers 6 to 11 are the second category, and numbers 12 to 18 are the third category;

[0045] (3) According to the classification, the jointed rock blocks are rearranged into 6 rows, ...

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Abstract

The invention discloses a method for preparing an irregular columnar joint rock sample, which comprises the following steps: (1) selecting a columnar joint area to be studied, obtaining a three-dimensional digital model of each joint rock block in the irregular columnar joint rock mass, and generating Forming the solid mold of each jointed rock block; (2) preparing cement mortar, pouring in the solid mold to obtain a column that simulates each jointed rock block; (3) demoulding and curing the column; (4) curing Good irregular columns are bonded together according to the joint network of the actual columnar joint rock mass, cut and polished to obtain irregular columnar joint rock samples. Among them, the solid mold is spliced ​​by several individual irregular mold blocks, each mold block contains a part of the forming area of ​​the jointed rock block, and the complete forming area of ​​the jointed rock block is obtained by splicing adjacent mold blocks. This method can obtain rock samples with a high degree of conformity with engineering rocks, and simulates joints and fissures, which is representative.

Description

technical field [0001] The invention relates to a method for preparing a sample, in particular to a method for preparing a rock sample with irregular columnar joints, and belongs to the field of geotechnical engineering. Background technique [0002] Columnar joints are a kind of primary tensile fracture structure commonly found in volcanic lavas. It often cuts the complete rock mass into irregular prisms, usually in the shape of square, five, or hexagonal prisms. It has special rock mass structure and mechanical properties. Many large hydropower stations in Southwest China, such as the Baihetan Hydropower Station, Xiluodu Hydropower Station, Leshan Tongjiezi Hydropower Station in Sichuan, Jin'anqiao Hydropower Station in the lower reaches of the Jinsha River, etc., encountered columnar joint rocks during the construction process. The integrity of the columnar joint rock mass is poor, with obvious discontinuous, easy to crack and anisotropic mechanical characteristics. Bot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/36G06F30/20G06F119/14G06F119/08G06F111/10G06T7/62G06T17/00
CPCG01N1/28G01N1/36G06T17/00G06T7/62G01N2001/366G01N2001/364G06T2200/08G06T2207/30132G06F2111/10G06F2119/06G06F2119/08G06F30/20
Inventor 王环玲向志鹏徐卫亚孟庆祥李跃苏佳盼刘士奇
Owner HOHAI UNIV
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