A method of microbial solidification-fiber reinforcement combined modification of sandy soil
A fiber reinforcement and microbial technology, applied in soil protection, construction, infrastructure engineering, etc., can solve the problem of difficult to take into account the toughness and overall strength of the matrix, and achieve the effect of reducing adverse effects, convenient operation, and meeting engineering needs.
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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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