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Mucky clay similar material used for simulating deep foundation pit construction mechanism and preparation method of similar material

A similar material and silt technology, which is applied in the field of silt clay similar materials used to simulate the construction mechanism of deep foundation pits and its preparation, can solve the problems of instability and damage, strong structure, endangering people's life and property safety, etc. Improves cohesion, improves permeability and strength

Active Publication Date: 2018-05-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The contradiction between the rapid urbanization process of developed coastal cities and limited land resources makes the development and utilization of urban underground space more and more extensive, resulting in an increasing number of foundation pit projects in coastal areas; Blindly carrying out deep foundation pit engineering in the near-coastal strata can easily lead to its instability and damage, endangering the safety of people's lives and properties
At present, clay is often used to simulate soft soil such as silt in rock and soil tests. However, due to the properties of silty clay with high natural water content, large natural void ratio, poor permeability, low strength, high compressibility, and strong structure, only clay is used. It cannot be used to simulate the engineering mechanical properties of silty clay strata in model tests

Method used

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  • Mucky clay similar material used for simulating deep foundation pit construction mechanism and preparation method of similar material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The concrete steps of described similar material preparation are as follows:

[0039] (1) Select Yellow River sand and soft clay without obvious impurities;

[0040] (2) Determine the permeability of similar materials required by the model test, and configure different proportions for comparative experiments;

[0041] (3) proportioning by weight: 100 parts of Yellow River sand and 11 parts of soft clay;

[0042] (4) Feeding and stirring, so that the materials are mixed evenly;

[0043] (5) Add silicone oil to the uniformly stirred material, the quality of silicone oil is 9% of the sum of the Yellow River sand and soft clay quality;

[0044] (6) Control the degree of compaction according to the needs of the experiment to make the model test material compacted and shaped. Under the condition of 95% degree of compaction, the water content is 68.7%, the void ratio is 1.924, and the permeability coefficient is 3.2×10 -6 cm / s, shear strength 0.52kPa, compression model 0.63...

Embodiment 2

[0046] The concrete steps of described similar material preparation are as follows:

[0047] (1) Select Yellow River sand and soft clay without obvious impurities;

[0048] (2) Determine the permeability of similar materials required by the model test, and configure different proportions for comparative experiments;

[0049] (3) Proportioning 100 parts of Yellow River sand and 17 parts of soft clay by weight;

[0050] (4) Feeding and stirring, so that the materials are mixed evenly;

[0051] (5) Add silicone oil to the uniformly stirred material, and the quality is 8% of the sum of the Yellow River sand and soft clay quality;

[0052] (6) Control the degree of compaction according to the needs of the experiment to make the model test material compacted and formed. In the case of 95% degree of compaction, the water content is 62.5%, the void ratio is 1.638, and the permeability coefficient is 2.6×10 -6 cm / s, shear strength 0.84kPa, compression model 0.92MPa.

Embodiment 3

[0054] The concrete steps of described similar material preparation are as follows:

[0055] (1) Select Yellow River sand and soft clay without obvious impurities;

[0056] (2) Determine the permeability of similar materials required by the model test, and configure different proportions for comparative experiments;

[0057] (3) Proportioning 100 parts of Yellow River sand and 25 parts of soft clay by weight;

[0058] (4) Feeding and stirring, so that the materials are mixed evenly;

[0059] (5) Add silicone oil to the uniformly stirred material, and the quality is 7% of the sum of the Yellow River sand and soft clay quality;

[0060] (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 water content is 58.6%, the void ratio is 1.486, and the permeability coefficient is 1.8×10 -6 cm / s, shear strength 1.12kPa, compression model 1.47MPa. .

[006...

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Abstract

The invention discloses a mucky clay similar material used for simulating deep foundation pit construction mechanism and a preparation method of the similar material. The proportions of components with different permeation grades of the similar material are as follows that high-permeability mucky clay comprises 96-105 parts of Yellow River sand, 11-17 parts of soft clay and 8-10 parts of siliconeoil; middle-permeability mucky clay comprises 95-104 parts of the Yellow River sand, 17-25 parts of the soft clay and 8-11 parts of the silicone oil; and low-permeability mucky clay comprises 96-105 parts of the Yellow River sand, 25-30 parts of the soft clay and 9-12 parts of the silicone oil. The similar material has the performance of high water content, low strength, high compressibility and the like, and is easy to be used to simulate the mechanical and deformation characteristics of muddy clay caused by deep foundation pit construction. In addition, materials can be obtained from local resources, and the utilization rate of the resources is improved.

Description

technical field [0001] The invention specifically relates to a muddy clay-like material for simulating the construction mechanism of a deep foundation pit and a preparation method thereof. technical background [0002] The contradiction between the rapid urbanization process of developed coastal cities and limited land resources makes the development and utilization of urban underground space more and more extensive, resulting in an increasing number of foundation pit projects in coastal areas; Blindly carrying out deep foundation pit engineering in the near-coastal strata can easily lead to its instability and damage, endangering the safety of people's lives and properties. At present, clay is often used to simulate soft soils such as silt in rock and soil tests. However, due to the high natural water content, large natural void ratio, poor permeability, low strength, high compressibility, and strong structure of silty clay, only clay is used. It cannot be used to simulate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00G01N1/28
CPCC04B30/00G01N1/286C04B14/068C04B14/10C04B24/42
Inventor 武科于雅琳张前进崔帅帅厉雅萌
Owner SHANDONG UNIV
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