Tests for dynamic modulus and damping ratio of high polymer cementitious Gobi soil

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (3) : 12-20.

YANG Haihua1,2,3, LIU Liang1,2,3, LIU Hanlong1,2,3,4, GAO Pengzhan1, CHEN Yumin2,3

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Abstract

High polymer cementitious Gobi soil is that high polymer is mixed into Gobi soil, which can effectively improve the basic properties of undisturbed Gobi soil. The dynamic elastic modulus and damping ratio of polymer cemented Gobi soil under different polymer mass ratio, confining pressure, consolidation ratio and loading frequency were studied by medium-sized dynamic triaxial test. The results show that the polymer mass ratio Rp has a great influence on the dynamic elastic modulus and damping ratio. When the cyclic stress ratio is 0.157, the dynamic elastic modulus increases linearly with the increase of Rp; When CSR is greater than 0.157, the dynamic elastic modulus first increases and then decreases with the increase of Rp, and the peak value appears when Rp is 3%; Under the same CSR, the residual strain of natural Gobi soil under vibration load is larger than that of high polymer cemented Gobi soil. When Rp is 3%, the residual strain after five vibrations is only 18.4% of that of natural Gobi soil; The damping ratio decreases slightly with the increase of Rp. Based on Shen Zhujiang dynamic model, a modified model considering the influence of polymer mass ratio is established, and the applicability of the modified model is verified by experiments. The research results can provide a theoretical basis for the dynamic analysis and engineering application of high polymer Gobi soil.

Key words

High polymer cementitious Gobi soil / Dynamic triaxial test / Dynamic elastic modulus / Damping ratio / Hysteresis loops / Dynamic model

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YANG Haihua1,2,3, LIU Liang1,2,3, LIU Hanlong1,2,3,4, GAO Pengzhan1, CHEN Yumin2,3. Tests for dynamic modulus and damping ratio of high polymer cementitious Gobi soil[J]. Journal of Vibration and Shock, 2023, 42(3): 12-20

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