Study on Dynamic Strength Characteristics of Malan Loess

Wang, Nian Qin; Liu, Xiao Ling; Luo, Dong; Yao, Yongsheng

doi:10.4028/www.scientific.net/amm.170-173.964

Cited by 3 publications

(2 citation statements)

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“…17. [52][53][54][55][56][57][58]. These compounds create a cement structure within the soil, forming a cement-soil skeleton that prevents particles from easily sliding relative to each other and thus increasing inter-particle friction.…”

Section: Discussionmentioning

confidence: 99%

Laboratory Tests and Numerical Simulation on the Loess Subgrade Improved by Lime-Lignin

Jia,

Zhang,

et al. 2023

Preprint

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Conventional techniques individually incorporating the inorganic or organic modifiers are insufficient to achieve the amelioration of loess roadbed in practices, which has restricted the development of infrastructures. This paper utilizes the lime-lignin to modify the loess, for which a series of mixing samples with various additives dosages (i.e. 0,2%:1%,4%:2%,6%:3% and 8%:4%) was adopted. Laboratory experiments and numerical simulation were carried out to investigate the mechanical properties of amended loess. Test results showed that both the compressive and shear strengths of the improved loess exhibit an initial rise followed by a decline as the contents of lime and lignin increase, with the optimal improvement effect achieved at a lime-to-lignin mixing content of 2%:1%. The results also indicated that numerical simulation can well corroborate the laboratory results, which are manifested in reduced roadbed settlements and favourable stress transfer mechanisms. An intricate three-dimensional network structure established by lignin fibers and a cement-soil skeleton formed between lime hydrate and soil particles jointly improve the strength of the soil matrix. The main research findings can offer valuable theoretical references for the enhancement of the loess subgrade.

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Section: Discussionmentioning

confidence: 99%

Laboratory Tests and Numerical Simulation on the Loess Subgrade Improved by Lime-Lignin

Jia,

Zhang,

et al. 2023

Preprint

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“…Paleosol layer in old loess are always the weak intercalation in slope structure with the characteristics of high clay content, water insulation, easy disintegration and softening in water etc. which are the internal facters of the landslide formation, especially under the effect of dynamic function, "loess soil structure loses its stability, and its strength decreases greatly" [1] . Xie dingyi, Wang lanmin el.…”

Section: Introductionmentioning

confidence: 99%

Test of Dynamic Strength Characteristics of Paleosol

Wang

Liu

Xue

et al. 2013

AMR

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Paleosol is an important factor affecting the stability of loess slope, and its mechanical properties, deformation and failure mechanism are still under in-depth exploration and research. Here based on the GDS Lab System, using equivalent sine wave progressively loading mode of strain controlling, in order to reveal the dynamic strength characteristics of Paleosol under the vibration effect. The result show that:① there is an obvious phenomenon of stress relaxation during the cyclic loading test on Paleosol; Paleosol is high-consolidated clay, when the given confining pressure less than the natural confining pressure, the degree of stress relaxation increased at first and then decreased,to the contrary first decreased and then increased.② under the 50kPa、80kPa、100kPa confining pressure, the dynamic failure stress of Paleosol is 0.176kN、0.2302kN、0.2555kN,the dynamic failure stress increases linearly with the increase of confining pressure. The correlation coefficient is 0.9009 and the linear regression equation is бd=0.001б3+0.0958.③ On the basis of Molar Coulomb failure criterion, We obtained the index of dynamic strength of Paleosol, which was C=25.63kPa and φ=14º, by Molar Circle. In comparison with the static strength, the internal friction angle and cohesion decreases significantly, show that the Paleosol have obvious characteristic of brittle.

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