循环荷载下牡蛎壳粉改性膨胀土累积应变规律

doi:10.11988/ckyyb.20231139

摘要/Abstract

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。

关键词: 膨胀土, 牡蛎壳粉, 列车循环荷载, 累计应变, 孔压

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.

Key words: expansive soil, oyster shell powder, train cyclic load, cumulative strain, pore pressure

中图分类号:

U416

陈川, 唐正辉, 黄震, 周维政, 邵羽, 贡斌. 循环荷载下牡蛎壳粉改性膨胀土累积应变规律[J]. 长江科学院院报, 2025, 42(3): 125-132.

CHEN Chuan, TANG Zheng-hui, HUANG Zhen, ZHOU Wei-zheng, SHAO Yu, GONG Bin. 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.

图/表 20

表1 膨胀土的基本物理性质指标

Table 1 Basic physical properties of expansive soil

天然含水率/%	最优含水率/%	最大干密度/ (g·cm^-3)	液限 ω_L/%	塑限 ω_P/%	塑性指数I_P	自由膨胀率/%
35.67	18.3	1.61	60.1	22.4	37.7	82

图1 膨胀土颗粒粒径分布

Fig.1 Particle size distribution of expansive soil

图2 膨胀土矿物组成分析结果

Fig.2 Analysis results of mineral composition of expansive soil

图3 牡蛎壳粉粒径分布

Fig.3 Particle size distribution of oyster shell powder

表2 煅烧试验结果

Table 2 Calcination test results

粒径组/ mm	煅烧前质量 m/g	煅烧后质量m_s/ g	碳酸钙质量m_c/ g	碳酸钙含量/%
(0,0.075)	3.000 7	1.878 0	2.381 1	79.35
[0.075,0.15]	2.999 9	1.881 3	2.371 8	79.06
(0.15,0.25]	3.001 3	1.806 3	2.545 4	84.81
(0.25,0.5]	3.001 1	1.695 9	2.795 8	93.16
(0.5,1.0]	3.000 5	1.681 2	2.827 9	94.25
(1.0,2.0]	3.000 8	1.674 1	2.844 7	94.80

图4 X射线衍射图谱

Fig.4 X-ray diffraction patterns

表3 物相分析结果

Table 3 Phase analysis results

粒径/mm	矿物相对含量/%
粒径/mm	碳酸钙	石英
(0,0.075]	85.6	14.4
(0.15,0.25]	90.4	9.6
(0.5,1.0]	95.7	4.3

图5 试验加载及动荷载波形

Fig.5 Test loading and dynamic load waveform

图6 牡蛎壳粉掺量影响下轴向累积应变振次关系

Fig.6 Relationship between axial cumulative strain and vibration frequency under varying dosage of oyster shell powder

图7 εps与牡蛎壳粉掺量关系

Fig.7 Relationship between εps and the dosage of oyster shell powder

图8 牡蛎壳粉粒径影响下轴向累积应变振次关系

Fig.8 Relationship between axial cumulative strain and vibration frequency under varying particle size of oyster shell powder

图9 εps与牡蛎壳粉粒径关系

Fig.9 Relationship between εps and the particle size of oyster shell powder

图10 循环应力比影响下轴向累积应变-振次关系

Fig.10 Relationship between axial cumulative strain and vibration frequency under varying cyclic stress ratio

图11 εps与循环应力比的关系

Fig.11 Relationship between εps and cyclic stress ratio

图12 牡蛎壳粉掺量影响下累积孔压振次关系

Fig.12 Relationship between cumulative pore pressure and vibration frequency under varying dosage of oyster shell powder

图13 改性土累积孔压稳定值Δups与牡蛎壳粉掺量关系

Fig.13 Relationship between cumulative pore pressure stability value Δups of modified soil and the dosage of oyster shell powder

图14 牡蛎壳粉粒径影响下累积孔压-振次关系

Fig.14 Relationship between cumulative pore pressure and vibration frequency under varying particle size of oyster shell powder

图15 改性土累积孔压稳定值Δups与牡蛎壳粉粒径关系

Fig.15 Relationship between cumulative pore pressure stability value Δups of modified soil and the particle size of oyster shell powder

图16 循环应力比影响下累积孔压-振次关系

Fig.16 Relationship between cumulative pore pressure and vibration frequency under varying cyclic stress ratio

图17 改性土累积孔压稳定值Δups与循环应力比的关系

Fig.17 Relationship between cumulative pore pressure stability value Δups of modified soil and cyclic stress ratio

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