Method for manufacturing annular test-piece from cylindrical rock-soil material sample

A technology of geotechnical materials and cylindrical shape, which is applied in the field of preparing ring-shaped test pieces, can solve problems such as unstable clamping, difficult sampling methods, and damage to the structure of test pieces, and achieves convenient operation, high economic value and application value , The effect of simple method steps

Inactive Publication Date: 2010-02-24
XIAN UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

Usually, the sample retrieved from the site is cylindrical. If the above-mentioned cylindrical geotechnical material is directly clamped on the drilling rig to sample the ring-shaped specimen, one is that the clamping is unstable, and the other is that the clamping force is too large to destroy the test piece Therefore, the conventional sampling method for producing annular specimens from cylindrical geotechnical materials is difficult

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  • Method for manufacturing annular test-piece from cylindrical rock-soil material sample

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Embodiment 1

[0036] Such as figure 1 Shown, a kind of sampling method of making annular test piece from cylindrical geotechnical material sample of the present invention, comprises the following steps:

[0037] Step 1. Make a regular shape of the cube. The making process includes the following steps:

[0038] 101. According to the model size of the sampling rig used and the structure and size of the cylindrical geotechnical material sample to be sampled, predict and determine the size of the cubic remodeling regular sample made. The length, width and height of the remodeling regular sample are all different. less than the length, width and height of the cylindrical geotechnical material sample to be sampled.

[0039] In this embodiment, the cylindrical rock-soil material sample to be sampled is a cylindrical coal sample retrieved from the site.

[0040] 102. According to the predicted size of the cube remodeling regular shape, process and manufacture a molding mold with a cubic inner cav...

Embodiment 2

[0058] In this embodiment, the difference from Embodiment 1 is that the cylindrical rock-soil material sample to be sampled in step 101 is a soil sample, and the diameter of the cylindrical soil sample is Φ100 mm and its height is 100 mm. First of all, the soil sample should be prepared according to the conventional method and the soil sample should be made by pressing the mold, and the dry density of the undisturbed soil used is 1.7g / cm 3 , the moisture content is 16.7%. In step 102, the formed mold is a square wooden box with an inner cavity of 130mm×130mm×150mm. When loading the mold in step 104, it is also necessary to mark the center position of the soil sample on the upper part of the asphalt mixture wrapped outside the soil sample. In step 105, cold water is used for demoulding. Before the demoulding, first reshape the molding mold together with the cube inside it into a regular shape, let it stand for cooling for 2 minutes, then put it into cold water for demoulding,...

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Abstract

The invention discloses a method for manufacturing an annular test-piece from a cylindrical rock-soil material sample, comprising the following steps: 1. manufacturing a cube remodeling regular sample: predicating and determining the size of the cube remodeling regular sample, manufacturing a molding die having an inner cavity of cubic shape, and preparing asphalt mixture; die-filling: sealing andwrapping the cylindrical rock-soil material sample to be sampled in the asphalt mixture; and de-molding to obtain a cube remodeling regular sample composed by the cylindrical rock-soil material sample and the asphalt mixture wrapped outside; 2. sampling; and 3. stripping, the asphalt mixture which is heated, softened and wrapped outside the cylindrical rock-soil material sample to obtain the annular test-piece. The invention has simple and convenient steps, convenient operation and low sampling cost, can simply and conveniently realize the sampling process of manufacturing an annular test-piece from a cylindrical rock-soil (coal, natural soil) material sample.

Description

technical field [0001] The invention relates to a sampling method, in particular to a method for preparing a ring-shaped test piece from a cylindrical rock-soil material sample. Background technique [0002] In the process of studying the influence of the inhomogeneity of rock and soil materials on strength and deformation, it is usually necessary to make rock and soil materials into ring-shaped specimens for testing. For example, in the study of gas burst explosion, the structure of coal must be considered effect on tensile strength. Usually, the sample retrieved from the site is cylindrical. If the above-mentioned cylindrical geotechnical material is directly clamped on the drilling rig to sample the ring-shaped specimen, one is that the clamping is unstable, and the other is that the clamping force is too large to destroy the test piece. Therefore, the conventional sampling method for preparing annular specimens from cylindrical geotechnical materials is difficult. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/02
Inventor 李晓军王贵荣陈练武周建一
Owner XIAN UNIV OF SCI & TECH
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