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Preparing method of high-compactness semicircular bentonite block of buffer material test bed

A test bench and cushioning material technology, which is applied in the preparation of test samples, analysis materials, sampling, etc., can solve the problems of failing to propose a preparation method, achieve uniform density, small size deviation of soil samples, and reduce springback Effect

Active Publication Date: 2018-03-06
BEIJING RES INST OF URANIUM GEOLOGY
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  • Abstract
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Problems solved by technology

In 2005, my country carried out research on large-scale test benches for cushioning materials. In order to prepare a large number of high-compacted semicircular bentonite blocks required in the test benches, Chinese researchers carried out a large number of indoor experiments, which were limited by various conditions. , has not been able to propose a preparation method that can meet the test requirements

Method used

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  • Preparing method of high-compactness semicircular bentonite block of buffer material test bed

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preparation example Construction

[0032] A method for preparing a high-pressure compacted semicircular bentonite block on a cushioning material test bench, comprising the following steps:

[0033] Step 1, pressing preparation;

[0034] Step 2, displacement control pressing;

[0035] Step 3, load control suppression;

[0036] Step 4, secondary displacement control pressing;

[0037] Step five, press molding.

[0038] Described step one compression preparation comprises the following steps:

[0039] Step (1.1) According to the predetermined dry density and volume, calculate and weigh the corresponding mass of bentonite powder, put it into the pressing mold and pre-compact it, set the height of the pressed sample and mark it on the mold.

[0040] Step (1.2), install the pressing mold with bentonite on the press so that the center points of the mold and the upper and lower platens of the press are on the same vertical line, use a guide device between the upper platen and the mold, and the load of the press is ...

Embodiment 1

[0050] (1) According to the predetermined dry density and volume, calculate and weigh the corresponding mass of bentonite powder, put it into the pressing mold and pre-compact it, set the height of the pressed sample and mark it on the mold. The bentonite block prepared in this example has a radius of 80mm, a height of 40mm, and a dry density of 1.6g / cm 3 .

[0051] (2) Install the pressing mold filled with bentonite on the press so that the center points of the mold and the upper and lower platens of the press are on the same vertical line, that is, three centers and one line, and a guide device is used between the upper platen and the mold. The press is a microcomputer-controlled servo rock mechanics testing machine, the load of the press is not less than 800kN, and the control mode of displacement and load can be switched without impact.

[0052] (3) First, in the displacement control mode, start to suppress the soil block at a speed of 5mm / min, and set the limited target ...

Embodiment 2

[0058] (1) According to the predetermined dry density and volume, calculate and weigh the corresponding mass of bentonite powder, put it into the pressing mold and pre-compact it, set the height of the pressed sample and mark it on the mold. The bentonite block prepared in this example has a radius of 90mm, a height of 50mm, and a dry density of 1.7g / cm 3 .

[0059] (2) Install the pressing mold filled with bentonite on the press so that the center points of the mold and the upper and lower platens of the press are on the same vertical line, that is, three centers and one line, and a guide device is used between the upper platen and the mold. The press is a microcomputer-controlled servo rock mechanics testing machine, the load of the press is not less than 800kN, and the control mode of displacement and load can be switched without impact.

[0060] (3) First, in the displacement control mode, start to suppress the soil block at a speed of 5mm / min, and set the limited target ...

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Abstract

The invention belongs to the technical field of evaluation of long-term performance of a buffer material, in particular to a preparing method of a high-compactness semicircular bentonite block of a buffer material test bed. The technical purpose is to provide the preparing method of the high-compactness semicircular bentonite block of the buffer material test bed aiming at insufficiencies in the prior art. A method of using single-shaft static compression to prepare the high-compactness semicircular bentonite block of the buffer material test bed is adopted so that the high-compactness semicircular bentonite block which is uniform in density, small in dimensional deviation, and meets the requirements of buffer materials of a high-level radioactive waste deep geological disposal repositorycan be prepared. According to the technical scheme, the method comprises the following steps of 1, compression preparation, 2, displacement control compression, 3, load control compression, 4, secondary displacement control compression and 5, compression molding.

Description

technical field [0001] The invention belongs to the technical field of long-term performance evaluation of buffer materials, and in particular relates to a preparation method of a high-compacted semicircular bentonite block on a buffer material test bench. Background technique [0002] A large amount of high-compression buffer material is required as an important artificial barrier in the deep geological repository of high-level radioactive waste. It is placed between the disposal rock mass and the packaging body of high-level radioactive waste, and plays an engineering barrier, a hydraulic barrier, a chemical barrier, and a conductive barrier. It is an important guarantee for the safety and stability of the geological repository. On the basis of the research on the basic properties of bentonite, scientists from all over the world began to prepare large blocks for buffer backfill materials, and carried out indoor and on-site large-scale test bench research on pre-selected be...

Claims

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Application Information

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IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 马利科刘月妙曹胜飞谢敬礼高敏
Owner BEIJING RES INST OF URANIUM GEOLOGY
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