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| Citation: | Wang Yan, Yang Hu, Yang Manman, Zeng Changnü, 2022. Preparation Tests of High Flowing Soil from Subway Residue Soil in Yellow River Flooding Area. Earth Science, 47(12): 4698-4709. doi: 10.3799/dqkx.2022.186
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The engineering behaviors of high flowing soil prepared from the subway residue soil were tested in this paper, which may greatly improve the utilized efficiency of the soil. The waste silty clay and silty sand were used in these tests mixing with different proportions of cement and water. Twenty-four groups of mixing soil considering the effect of soil type and mix proportion were prepared for the tests. The tests includes the fluidity measuring tests, bleeding tests and strength tests, which characterize the engineering behavior of these samples. It can be concluded that the low-strength sand soil shows a greater fluidity than that of the silty clay. The adding of foam can also improve its fluidity of the mixing soil. Most of the fluidity parameters prepared mixing soil can meet the engineering requirement within two hours. An empirical formula of fluidity was fitted from the test results of the mixing silty clay soil. The unconfined strength and deformation characteristics of solidified soil samples were also performed by digital image triaxial apparatus. The different failure modes were analyzed by comparing the original and damaged solidified soil samples. It can be concluded that the failure modes were represented by the shear failure, compression failure and splitting failure when the contents of curing agent are 5%, 10%, 15% and 20%, respectively. The flow loss rate, compressive strength and deformation model of the flowing soil were presented, from which the engineering application of preparing high flowing soil were recommended.
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