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Similar material for simulating expansible tunnel surrounding rock and preparation method of similar material

A technology similar to materials and tunnels, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of mechanical properties and deformation characteristics change, damage, high cost of remote sampling, etc., to improve permeability, Suppresses swelling and enhances cohesion

Inactive Publication Date: 2015-09-09
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 project is often in precipitation weather conditions, and the dry-wet cycle has a significant impact on the swelling and shrinking surrounding rock of the tunnel. The surrounding rock will be damaged to a certain extent during the sampling and transportation process, and its original mechanical properties At the same time, the cost of long-distance sampling is high; at present, bentonite is often used in rock and soil tests to simulate the swelling and shrinking surrounding rock of tunnels, but due to the nature of its expansion and contraction when it encounters water and blocks the gaps in fillers, water seepage tests are difficult to carry out , which cannot be used to simulate the expansion and contraction of surrounding rock in tunnels under the action of dry-wet cycles

Method used

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  • Similar material for simulating expansible tunnel surrounding rock and preparation method of similar material
  • Similar material for simulating expansible tunnel surrounding rock and preparation method of similar material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The concrete steps of described similar material preparation are as follows:

[0036] (1) Select expansive soil and fly ash without obvious impurities and larger consolidated lumps;

[0037] (2) Determine the permeability of similar materials required by the model test, and configure different proportions for comparative experiments;

[0038] (3) proportioning by weight: 100 parts of fly ash and 11 parts of bentonite;

[0039] (4) Feeding and stirring, so that the materials are mixed evenly;

[0040] (5) Add silicone oil to the uniformly stirred material, the quality of silicone oil is 9% of the sum of fly ash and bentonite quality;

[0041] (6) Control the degree of compaction according to the needs of the experiment to make the model test material compacted and formed. Under the condition of 95% degree of compaction, the permeability coefficient is 2.7×10 -5 cm / s.

Embodiment 2

[0043] The concrete steps of described similar material preparation are as follows:

[0044] (1) Select expansive soil and fly ash without obvious impurities and larger consolidated lumps;

[0045] (2) Determine the permeability of similar materials required by the model test, and configure different proportions for comparative experiments;

[0046] (3) 100 parts of proportioning fly ash and 17 parts of bentonite are carried out by weight;

[0047] (4) Feeding and stirring, so that the materials are mixed evenly;

[0048] (5) Add silicone oil to the uniformly stirred material, and the quality is 8% of the sum of fly ash and bentonite quality;

[0049] (6) Control the degree of compaction according to the needs of the experiment so that the model test material is compacted and formed. In the case of 95% degree of compaction, the permeability coefficients are 1.6×10 -5 cm / s.

Embodiment 3

[0051] The concrete steps of described similar material preparation are as follows:

[0052] (1) Select expansive soil and fly ash without obvious impurities and larger consolidated lumps;

[0053] (2) Determine the permeability of similar materials required by the model test, and configure different proportions for comparative experiments;

[0054] (3) 100 parts of proportioning fly ash and 25 parts of bentonite are carried out by weight;

[0055] (4) Feeding and stirring, so that the materials are mixed evenly;

[0056] (5) Add silicone oil to the uniformly stirred material, and the quality is 7% of the sum of fly ash and bentonite quality;

[0057] (6) Control the degree of compaction according to the needs of the experiment so that the model test material is compacted and formed. In the case of 95% degree of compaction, the permeability coefficients are 1.1×10 -5 cm / s.

[0058] Table 1 The ingredient composition and permeability of the three examples meet the permeabi...

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Abstract

The invention relates to a similar material for simulating an expansible tunnel surrounding rock and a preparation method of the similar material. The similar material comprises the following components with different permeation grades: high-permeability expansive soil, medium-permeability expansive soil and low-permeability expansive soil, wherein the high-permeability expansive soil comprises 96-105 parts of coal ash, 11-17 parts of bentonite and 8-10 parts of silicon oil; the medium-permeability expansive soil comprises 95-104 parts of coal ash, 17-25 parts of bentonite and 8-11 parts of silicon oil; and the low-permeability expansive soil comprises 96-105 parts of coal ash, 25-30 parts of bentonite and 9-12 parts of silicon oil. According to the preparation method, bentonite with different permeation rates can be proportioned to carry out a model experiment, not only can the drying and wetting cycle field condition be simulated, but also the mechanical and deformation characteristics of the expansible surrounding rock can be met; and the local materials are used, so that the materials are conveniently obtained and are saved. The bentonite is a rock mainly composed of montmorillonite so as to have extremely high expansibility. Non-combusted carbon granules in the coal ash are of loosen porous structures so as to have high permeability and an expansion inhibiting effect, and furthermore, the permeability and expansion grade of the similar material can be regulated by changing the ratio.

Description

technical field [0001] The invention specifically relates to a similar material for simulating expansion-contraction tunnel surrounding rock and a preparation method thereof. technical background [0002] At present, in the construction of tunnel engineering, the project is often in precipitation weather conditions, and the dry-wet cycle has a significant impact on the swelling and shrinking surrounding rock of the tunnel. The surrounding rock will be damaged to a certain extent during the sampling and transportation process, and its original mechanical properties At the same time, the cost of long-distance sampling is high; at present, bentonite is often used in rock and soil tests to simulate the swelling and shrinking surrounding rock of tunnels, but due to the nature of its expansion and contraction when it encounters water and blocks the gaps in fillers, water seepage tests are difficult to carry out , which cannot be used to simulate the expansion and contraction of su...

Claims

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Application Information

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IPC IPC(8): C04B26/32C04B18/08C04B14/10
CPCY02W30/91
Inventor 李术才吴昊天武科张文
Owner SHANDONG UNIV
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