高聚物胶凝戈壁土的动模量及阻尼比试验研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (3) : 12-20.

论文

杨海华1,2,3，刘亮1,2,3，刘汉龙1,2,3,4，高鹏展1，陈育民2，3

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

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

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文章历史 +

摘要

高聚物胶凝戈壁土是将高聚物掺入戈壁土中，可有效提高原状戈壁土的基本性质。采用中型动三轴试验研究了在不同高聚物质量比、围压、固结比、加载频率工况下高聚物胶凝戈壁土的动弹性模量和阻尼比变化规律。结果表明：高聚物质量比Rp对动弹性模量和阻尼比影响较大，在动应力比(cyclic stress ratio，CSR)为0.157时，动弹性模量随Rp增大呈线性增长；CSR大于0.157后随Rp增大动弹性模量先增大后减小，在Rp为3%时出现峰值；在相同CSR下，天然戈壁土在振动荷载下产生残余应变比高聚物胶凝戈壁土大，Rp为3%时经过5次振动后的残余应变仅为天然戈壁土的18.4%；阻尼比随Rp的增大略有降低。基于沈珠江动力模型，建立了考虑高聚物质量比影响的修正模型，并通过试验验证了修正模型的适用性。研究成果可为高聚物戈壁土的动力分析和工程应用提供理论依据。

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.

导出引用

杨海华1,2,3，刘亮1,2,3，刘汉龙1,2,3,4，高鹏展1，陈育民2，3. 高聚物胶凝戈壁土的动模量及阻尼比试验研究[J]. 振动与冲击, 2023, 42(3): 12-20

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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