Microbial curing-fiber reinforcement combined sandy soil modification method

A fiber-reinforced and microbial technology, applied in soil protection, construction, infrastructure engineering, etc., can solve problems such as matrix toughness and overall strength, and achieve the effects of improving planting problems, reducing adverse effects, and reducing emissions

Active Publication Date: 2019-04-09
南京南智碳中和研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the technical problem that it is difficult to balance the toughness of the matrix and the overall strength with the MICP cur...

Method used

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  • Microbial curing-fiber reinforcement combined sandy soil modification method
  • Microbial curing-fiber reinforcement combined sandy soil modification method
  • Microbial curing-fiber reinforcement combined sandy soil modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] MICP-basalt fiber joint reinforcement of quartz sand

[0050] 1) Prepare sand for sample loading, take a certain amount of quartz sand, add 10% water by mass fraction and mix well, then disperse basalt fibers according to 0-1.2% by mass percentage and mix them into each sample, and stir until uniform. For sample loading, add the sand into a cylindrical mold with a height of 7.5cm and a diameter of 3.7cm in layers during the sand filling process, and carry out a compaction operation for each filling of sand with a thickness of 2.5cm. After the operation is completed, the entire sample Weigh to ensure that the weight error of each sample does not exceed 1%, otherwise sample preparation is performed again to ensure that the compactness of each sample is the same, until the sample is completed, and the sample is numbered.

[0051] 2) Bacterial activation, first configure the required ATCC 1376 NH 4 -YE microbial liquid medium, medium (1L) formula is: yeast extract 20g, amm...

Embodiment 2

[0064] MICP-Carbon Fiber Jointly Reinforced Quartz Sand

[0065] In this embodiment, the steps are basically the same as in Embodiment 1, the difference is that:

[0066] In the sand preparation and sample loading step, the basalt fibers in Example 1 were replaced with carbon fibers and dispersed and mixed into each sample according to 0-0.8% by mass.

[0067] The carbon fiber density is 1.78g / cm 3 , diameter 0.01mm, tensile strength 3500 ~ 5000MPa, elastic modulus 240GPa, melting point 400 ℃, good acid and alkali resistance, good dispersion.

[0068] The unconfined compression test results of the sand samples after curing are shown in the table below:

[0069] Table 3 Unconfined compressive strength of sand samples with different carbon fiber content

[0070]

[0071] Table 4 Residual strength of sand samples with different carbon fiber content

[0072]

[0073] The test results show that the strength of the sand sample reinforced with carbon fiber is improved compare...

Embodiment 3

[0076] MICP-steel fiber joint reinforcement of quartz sand

[0077] In this embodiment, the steps are basically the same as in Embodiment 1, the difference is that:

[0078] In the sand preparation and sample loading step, the basalt fibers in Example 1 were replaced with steel fibers and dispersed and mixed into each sample according to 0-3.2% by mass.

[0079] The steel fiber density is 7.9g / cm 3 , diameter 0.2mm, tensile strength ≥ 2850MPa, excellent dispersion.

[0080] The unconfined compression test results of the sand samples after curing are shown in the table below:

[0081] Table 5 Unconfined compressive strength of sand samples with different steel fiber content

[0082]

[0083] Table 6 Residual strength of sand samples with different steel fiber content

[0084]

[0085] The test results show that the strength of the sand sample reinforced with steel fiber is improved compared with that of the plain soil after curing, and the strength of the sample incre...

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Abstract

The invention discloses a microbial curing-fiber reinforcement combined sandy soil modification method and belongs to the field of geological engineering-microbial interdiscipline. The method comprises the steps as follows: 1) adding a fiber material to sandy soil, adding water, performing uniform stirring, putting the mixture in a mold, and leaving the mixture to stand and drying the mixture after compacting and filling the mold; 2) activating a microbial solution with mineralization; 3) soaking the sandy soil in the activated microbial solution; 4) transferring the treated sandy soil to a maintenance device, and filling the maintenance with a gluing solution for gluing and curing. An MICP technology and a fiber reinforcement technology are combined to modify the sand soil, so that loosesandy soil is cured, the forming strength is improved, meanwhile, brittleness of a sandy soil cured body can be significantly reduced and residual strength and toughness of the sandy soil cured body can be improved due to addition of the fiber, the engineering properties of traditional MICP cured sandy soil are improved as a whole, and the method has great significance in further improving safetyand stability of engineering structures.

Description

technical field [0001] The invention belongs to the interdisciplinary field of geological engineering and microbes, and more specifically relates to a method for combining microbial solidification and fiber reinforcement to modify sandy soil. Background technique [0002] With the continuous development of the economy, infrastructure construction has become one of the most important driving forces for stimulating domestic demand. The scale of infrastructure construction has continued to expand, and various geological projects have ushered in unprecedented opportunities. In the past ten years, microbial geotechnical technology has focused on microorganisms that have an impact on the physical and mechanical properties of rock and soil, and controlled and utilized them to solve problems in geological engineering. With the deepening of research, the intersection of geological engineering and microorganisms has become closer and closer, and has gradually become a hot topic, and g...

Claims

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Application Information

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IPC IPC(8): E02D3/00E02D3/12
CPCE02D3/005E02D3/12E02D2300/0051
Inventor 唐朝生吕超谢约翰尹黎阳刘博李昊施斌蒋宁俊
Owner 南京南智碳中和研究院有限公司
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