Two criteria for effective improvement depth of sand foundation under dynamic compaction using discrete element method

Li, Yuqi; Fang, Yu; Yang, Zhaoyu

doi:10.1007/s40571-022-00506-5

Cited by 7 publications

(2 citation statements)

References 36 publications

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“…It is difficult for conventional geotechnical tests to understand the deeper mechanism of the shear deformation of sand. Therefore, discrete element numerical analysis has been widely increasing in the mechanical property analysis of sand (Ibrahim and Meguid, 2023;Li et al, 2023;Xie et al, 2023). The discrete element can easily consider the effect of sand particle gradation.…”

Section: Introductionmentioning

confidence: 99%

Effect of grain size distribution on the shear properties of sand

et al. 2023

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In this study, we investigated the effect of particle size distribution on the shear properties of sand. Direct shear tests were conducted using four types of sand samples with different particle size distributions obtained from standard sand produced by Xiamen ISO Co. Ltd. The results show that the influence of particle size distribution on the internal friction angle was significant. Typically, the internal friction angle increases with increasing the coefficient of non-uniformity (Cu) and decreasing the curvature coefficient (Cc). The discrete element results show that the initial particle size distribution significantly affects the porosity, coordination number, and particle slide fraction. In addition, the grey relation analysis revealed that the sliding fraction and coordination number have the greatest correlation with the internal friction angle. The research results of this study help to understand the changes in particle contact, internal stress, and particle sliding during the shear failure process of sand.

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Section: Introductionmentioning

confidence: 99%

Effect of grain size distribution on the shear properties of sand

et al. 2023

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“…The defects in the engineering properties of silt are that it is prone to liquefaction, shifting sand and other problems [ 2 ]. In order to make the soil meet the actual engineering needs, different degrees of improvement should be carried out on the unfavorable soil [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Different Improvement Schemes of EICP-Lignin Solidified Silt

Sun

Zhong

et al. 2023

Materials

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In practical engineering applications, silt is prone to liquefaction and quicksand. This paper mainly studies the improvement effects of urease, lignin and their mixture on the strength and liquefaction resistance of silt. Based on the results and phenomena of an unconfined compressive strength and dynamic triaxial test, the improvement effects of the compressive strength, deformation resistance and liquefaction resistance of silt under different improvement schemes are analyzed, and the optimal values of the cement or lignin when enzyme-induced calcium carbonate precipitation (EICP) technology, lignin alone or EICP and lignin are obtained. The results show that the optimum concentration of the constant temperature and humidity sample (referred to as the constant humidity sample) and the constant temperature immersion sample (referred to as the soaking sample) of urease in the unconfined compressive strength test is 1.0 mol/L, and the compressive strength of the soaking sample is 4.9 MPa, which is 1.56 times that of the constant humidity sample; the optimum addition ratio of the lignin-improved constant humidity sample is 3%, and its compressive strength is 2.07 Mpa; the optimum addition ratio of the samples immersed at constant temperature is 4%, and the compressive strength is 3.05 MPa; when urease combines with lignin to improve silt, 4% is the best lignin addition ratio, the compressive strength of the constant humidity sample reaches 1.57 Mpa and the compressive strength of the soaking sample reaches 3.75 MPa; in the dynamic triaxial multi-stage cyclic load test, all samples were cured at constant humidity sample, and in the urease modified silt scheme, 1.0 mol/L was the optimal cement concentration; in the scheme of improving silt with lignin, 3% is the optimal addition ratio; when 1.25 mol/L cementation solution plus urease crude extract is combined with different ratios of lignin in the experimental scheme, 3% is the best lignin addition ratio.

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Experimental and analytical study on the reinforcement mechanism of in-pipe deep dynamic compaction in loose sandy soil

Li,

Sun,

et al. 2024

Acta Geotech.

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Two criteria for effective improvement depth of sand foundation under dynamic compaction using discrete element method

Cited by 7 publications

References 36 publications

Effect of grain size distribution on the shear properties of sand

Effect of grain size distribution on the shear properties of sand

Experimental Study on Different Improvement Schemes of EICP-Lignin Solidified Silt

Experimental and analytical study on the reinforcement mechanism of in-pipe deep dynamic compaction in loose sandy soil

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