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Similar material for simulating expansive soil tunnel surrounding rock in model test and preparation method thereof

A similar material and model test technology, applied in the field of similar materials and their preparation, can solve the problem of high cost and achieve the effect of improving resource utilization

Inactive Publication Date: 2013-08-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the construction of tunnel engineering, the surrounding rock of many tunnels has a certain degree of expansibility, and the undisturbed soil will be damaged to a certain extent during the process of being transported to the laboratory, and its original mechanical properties and deformation characteristics will also be correspondingly changes, and the cost of taking soil from a long distance is high; but at the current stage, there is no method that can be used to simulate similar materials for expansive soil tunnel surrounding rock

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing similar materials for simulating expansive soil tunnel surrounding rock in model tests, the steps are:

[0018] (1) Pass the test raw material clay and bentonite through a 4.75mm sieve; (2) Determine the free expansion rate required by the model test material to be 38%; (3) Proportion by weight of 100 parts of clay and 2 parts of bentonite to obtain the free expansion rate 38%; (4) Feeding and stirring, so that the material is evenly mixed; (5) Comparing the moisture content and compaction degree of the calculation model test, adding water to the uniformly stirred material to the design moisture content; (6) According to the compaction degree The control method is to compact the model test material.

Embodiment 2

[0020] A method for preparing similar materials for simulating expansive soil tunnel surrounding rock in model tests, the steps are:

[0021] (1) Pass the test raw material clay and bentonite through a 4.75mm sieve; (2) Determine the free expansion rate required by the model test material to be 38%; (3) Proportion by weight of 100 parts of clay and 4 parts of bentonite to obtain the free expansion rate 47%; (4) Feeding and stirring, so that the material is evenly mixed; (5) Comparing the moisture content and compaction degree of the calculation model test, adding water to the uniformly stirred material to the design moisture content; (6) According to the compaction degree The control method is to compact the model test material.

Embodiment 3

[0023] A method for preparing similar materials for simulating expansive soil tunnel surrounding rock in model tests, the steps are:

[0024] (1) Pass the test raw material clay and bentonite through a sieve of 4.75 mm; (2) Determine the free expansion rate required by the model test material at 56%; (3) Proportion by weight of 100 parts of clay and 6 parts of bentonite to obtain the free expansion rate 56%; (4) Feeding and stirring, so that the material is mixed evenly; (5) Comparing the moisture content and compaction degree of the calculation model test, adding water to the uniformly stirred material to the design moisture content; (6) According to the compaction degree The control method is to compact the model test material.

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Abstract

The invention relates to a similar material for simulating expansive soil tunnel surrounding rock in a model test and a preparation method thereof. According to the similar material, clay and bentonite, which pass through a 4.75mm sieve, serve as main raw materials, the materials are proportioned by a weight part ratio according to different expansion levels, weak expansive soil is prepared from 100 parts of clay and not less than 2 and less than 10 parts of bentonite, medium expansive soil is prepared from 100 parts of clay and not less than 10 and less than 22 parts of bentonite, strong expansive soil is prepared from 100 parts of clay and not less than 22 and less than 30 parts of bentonite, water is added to the mixed materials, and compaction molding is carried out so as to prepare the similar material. According to the similar material and the preparation method, expansive soil with different free expansion ratios can be prepared so as to carry out the model test, so that the mechanical and deformation characteristics of the expansive soil surrounding rock can be met, the raw materials can be obtained locally, the operation is simple and convenient, and the resource utilization ratio is increased.

Description

technical field [0001] The invention relates to a similar material used for simulating expansive soil tunnel surrounding rock in model tests and a preparation method thereof. Background technique [0002] At present, in the construction of tunnel engineering, the surrounding rock of many tunnels has a certain degree of expansibility, and the undisturbed soil will be damaged to a certain extent during the process of being transported to the laboratory, and its original mechanical properties and deformation characteristics will also be correspondingly However, at the current stage, there is no method that can be used to simulate similar materials of expansive soil tunnel surrounding rock. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a similar material used in model tests to simulate expansive soil tunnel surrounding rock and its preparation method, which can not only obtain local materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/13
Inventor 武科赵闯李术才
Owner SHANDONG UNIV
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