循环荷载下牡蛎壳粉改性膨胀土累积应变规律

陈川; 唐正辉; 黄震; 周维政; 邵羽; 贡斌

doi:10.11988/ckyyb.20231139

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raybet体育在线院报 ›› 2025, Vol. 42 ›› Issue (3) : 125-132. DOI: 10.11988/ckyyb.20231139

岩土工程

循环荷载下牡蛎壳粉改性膨胀土累积应变规律

陈川 ¹ ,
唐正辉 ¹ ,
黄震 ² ,
周维政 ² ,
邵羽 ¹ ,
贡斌 ²

作者信息 +

Cumulative Strain Law of Expansive Soil Reinforced with Oyster Shell Powder under Cyclic Loading

Author information +

文章历史 +

摘要

为探究循环荷载下牡蛎壳粉改性膨胀土的累积应变和累积孔压发展规律,采用动三轴试验系统对膨胀土施加循环荷载以模拟车辆动力作用。试验涉及不同牡蛎壳粉粒径(d_osp)、掺量(F_osp)和循环应力比(CSR)条件下的轴向累积应变和累积孔压发展规律。研究结果表明:当d_osp<0.5 mm时,改性土的轴向累积应变和累积孔压随牡蛎壳粉掺量的增加而明显改善;当F_osp=9%、d_osp<0.5 mm时,改性土的动力性能较为接近;当d_osp>0.5 mm时,改性土的动力性能指标相比于素土有所劣化,且这种劣化作用随着牡蛎壳粉掺量的增加和粒径的增大而更加显著。根据研究结果,当牡蛎壳粉改性土用作设计速度200 km/h以下的有砟轨道铁路路基填料时,建议控制牡蛎壳粉掺量为F_osp=9%,粒径控制在d_osp=(0.25,0.5]mm范围内。

Abstract

This study investigates the development of cumulative strain and cumulative pore pressure of expansive soil reinforced with oyster shell powder (OSP) under cyclic loading. A GDS dynamic triaxial test system was employed to simulate vehicle dynamic actions on the soil. The experiment examines axial cumulative strain and cumulative pore pressure under particle size (d_osp), dosage (F_osp), and cyclic stress ratio (CSR). Findings reveal that for particle sizes d_osp<0.5 mm, both axial cumulative strain and cumulative pore pressure in the modified soil significantly improve with increasing OSP content. However, when F_osp=9% and d_osp=0.5 mm, the dynamic performance of the modified soil is relatively stable. Conversely, for particle sizes d_osp>0.5 mm, the dynamic performance of the modified soil deteriorates compared to plain soil, with this degradation becoming more pronounced as both OSP content and particle size increase. Based on these results, if OSP-modified soil is used as roadbed filler for ballasted track railways with design speeds below 200 km/h, it is recommended to control the OSP content at F_osp=9%, with particle sizes limited to the range of (0.25,0.5] mm to maintain optimal dynamic performance.

导出引用

陈川, 唐正辉, 黄震, 等. 循环荷载下牡蛎壳粉改性膨胀土累积应变规律[J]. raybet体育在线院报. 2025, 42(3): 125-132 https://doi.org/10.11988/ckyyb.20231139

CHEN Chuan, TANG Zheng-hui, HUANG Zhen, et al. Cumulative Strain Law of Expansive Soil Reinforced with Oyster Shell Powder under Cyclic Loading[J]. Journal of Changjiang River Scientific Research Institute. 2025, 42(3): 125-132 https://doi.org/10.11988/ckyyb.20231139

中图分类号： U416

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