Method for preparing columnar jointing rock sample

A technology for columnar joints and rock samples, which is applied in the field of rock mechanics and engineering, can solve the problems of difficult collection of columnar jointed rock samples and broken joints, and achieve the effects of strong plasticity, strong pertinence, and low cost

Active Publication Date: 2020-07-03
HOHAI UNIV
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Problems solved by technology

[0004] In order to solve the problems that it is difficult to collect complete columnar joint rock samples at the dam foundation on site, and the joints are easily broken by external stress during the coring process, a method of preparing interlayer staggered columnar joint rock samples using meltable epoxy resin is provided. The method of simulating the joint model with fusible epoxy resin

Method used

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  • Method for preparing columnar jointing rock sample
  • Method for preparing columnar jointing rock sample

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Embodiment Construction

[0024] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0025] Such as figure 1 , a method for preparing a columnar jointed rock sample according to the present invention, comprising the following steps:

[0026] S1: Select the area on the rock mass where columnar joints need to be studied, and obtain the three-dimensional digital information of each jointed rock block in the rock mass; the three-dimensional digital information includes the collection of geometric similarity ratio C 1 Similar to bulk density than C Y , to obtain the similarity ratio C of rock mechanical parameters R =C 1 ×C Y , similar to elastic modulus than C E =C 1 ×C Y .

[0027] S2: Use epoxy resin and 3D printing technology to print the columnar joint mold; wherein epoxy resin is added with curing agent and rubber powder.

[0028] S3: In a vacuum environment, the cement slurry prepared by cement, standard sand, rubber...

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Abstract

The invention discloses a method for preparing a columnar jointing rock sample. The method comprises steps of selecting an area to be subjected to columnar jointing research, and acquiring the three-dimensional digital information of each jointing rock block in an irregular columnar jointing rock body; then, adopting hot melt resin as a rock-like jointing material to be applied to 3D printing of acolumnar jointing mold; injecting the cement paste into a mold through a vacuum negative pressure method by utilizing a gas-liquid balance principle, and carrying out maintenance treatment; when thecement paste enters a plastic state, heating and softening the resin, and applying a dislocation torque to enable the sample to be dislocated along a preset dislocation belt. The method is advantagedin that the fusible epoxy resin is adopted to simulate a jointing model, property of the epoxy resin is close to that of real rock, columnar jointing characteristics of the rock mass can be truly reflected, and problems that a complete columnar joint rock mass sample at a dam foundation on site is difficult to collect, and jointings are prone to being broken by external stress in the coring process are solved.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics and engineering, and in particular relates to a method for preparing a columnar jointed rock sample. Background technique [0002] The rock masses in major projects in the alpine and canyon areas are mostly complex multiphase media discontinuities, and the rock masses are divided by a large number of weak structural planes such as joints, fissures, faults, and fracture zones. As far as the Jinsha River Baihetan Hydropower Station is concerned, the dam foundation rock mass in the dam site area is mostly basalt with columnar joints. Columnar joints are mainly composed of slender columns, and their cross-sections are mainly irregular quadrilaterals, pentagons and hexagons. In the densely developed area of ​​columnar joints, the rock mass structure is complex and broken, the integrity and mechanical properties are poor, and it shows obvious heterogeneity, discontinuity, nonlinearity and anisot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 陈世壮王如宾徐卫亚梁晖
Owner HOHAI UNIV
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