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延安大学建筑工程学院,陕西 延安 716000
Received:12 July 2024,
Accepted:14 January 2025,
Published Online:02 April 2025,
Published:25 May 2025
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邱明明,李晓敏.极端干湿交替作用下浅层黄土剪切强度特性对比[J].中山大学学报(自然科学版)(中英文),2025,64(03):92-102.
QIU Mingming,LI Xiaomin.The shear strength characteristics of shallow loess under extreme dry-wet alternating[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(03):92-102.
邱明明,李晓敏.极端干湿交替作用下浅层黄土剪切强度特性对比[J].中山大学学报(自然科学版)(中英文),2025,64(03):92-102. DOI: 10.13471/j.cnki.acta.snus.ZR20240229.
QIU Mingming,LI Xiaomin.The shear strength characteristics of shallow loess under extreme dry-wet alternating[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(03):92-102. DOI: 10.13471/j.cnki.acta.snus.ZR20240229.
探明极端干湿交替气候条件下黄土的力学性质是地质体稳定性分析与评价的基础依据。以延安新区某工点路堑边坡Q
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黄土为研究对象,开展原状与重塑黄土多次干湿循环试验和直剪试验,揭示干湿循环次数、路径、幅度以及法向压力对黄土抗剪强度及其指标的影响规律。研究结果表明:不同法向压力条件下干湿循环黄土剪应力与剪切位移关系曲线呈应变软化型,其峰值特征随干湿循环次数增加而逐渐减弱;原状黄土在干湿循环条件下抗剪强度衰减相较于重塑黄土更为显著,经历3次干湿循环后抗剪强度衰减幅度达77.82%以上;高、低压力段下干湿循环黄土的抗剪强度及其指标存在明显差异,在直剪试验时应考虑低压力段;黄土抗剪强度指标随干湿循环次数呈快速衰减-缓慢衰减-渐进稳定的发展趋势,干湿循环作用对黏聚力的影响大于内摩擦角;黄土抗剪强度指标与干湿循环幅度呈负相关关系,干湿循环幅度越大,高压力段的黏聚力和低压力段的内摩擦角衰减越快;黄土抗剪强度指标的绝对劣化度曲线发展过程可描述为快速增长阶段(1~3次)、缓慢增长阶段(3~5次)和渐进稳定阶段(5~7次),快速增长阶段占比达78.77%以上;基于试验数据统计分析,建立了干湿循环黄土黏聚力和内摩擦角的绝对劣化度预测模型。
Understanding the mechanical properties of loess under extreme dry-wet alternating climatic conditions is essential for analyzing and evaluating the stability of geological bodies. Focusing on the Q
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loess of a cutting slope in the Yan'an new area, we conducted repeated dry-wet cycle tests and direct shear tests of undisturbed and remolded loess to investigate how factors, such as dry-wet cycles, cycling path, amplitude, and normal pressure, affect loess' shear strength and its associated properties. The results indicate that the relationship curve between shear stress and shear displacement for dry-wet cycle loess, under different normal pressures, exhibits a strain-softening behavior; Furthermore, the peak characteristics of the curve gradually diminish as the number of dry-wet cycles increases. The shear strength attenuation of undisturbed loess during dry-wet cycles is more pronounced than that of remolded loess, with shear strength decreasing by 77.82% after three dry-wet cycles. Significant differences exist in both shear strength and its parameters in dry-wet cycle loess across high- and low-pressure conditions, with the low-pressure condition requiring careful consideration in direct shear tests. The shear strength parameter of loess declines rapidly with the increasing number of dry-wet cycles initially, then decreases slowly before stabilizing. Notably, the impact of dry-wet cy
cles on cohesion is greater than that on internal friction angle. Additionally, the shear strength parameter of loess is negatively correlated with the amplitude of dry-wet cycles, cohesion in high-pressure conditions and internal friction angle in low-pressure conditions showed more significant deterioration at larger dry-wet cycle amplitudes. The evolution of the deterioration curve for the loess shear strength parameter can be divided into three stages: a rapid growth stage (1-3 times), a slow growth stage (3-5 times), and a gradual stability stage (5-7 times), with over 78.77% occurring during the rapid growth stage. Based on the statistical analysis of the experimental data, we have established a predictive model for the absolute deterioration degree of cohesion and internal friction angle in dry-wet cycle loess.
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