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试样制备与试验方法对粉土抗剪力学特性影响的试验研究

Experimental study on the influence of sample preparation and testing methods on the shear mechanical properties of silt.

作者信息

Wang Shige, Li Yanlong, Li Sen, Liu Jintao, Zhang Zongling, Lu Tianyou

机构信息

College of Architecture and Civil Engineering, Xinyang Normal University, Xinyang, China.

School of Intelligent Construction and Civil Engineering, Zhongyuan University of Technology, Zhengzhou, China.

出版信息

Sci Rep. 2025 May 6;15(1):15816. doi: 10.1038/s41598-025-00375-x.

DOI:10.1038/s41598-025-00375-x
PMID:40328812
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12056197/
Abstract

To investigate the influence of sample preparation conditions and testing methods on the shear properties of compacted silt, samples with different moisture contents were prepared by saturation and drying methods. The shear mechanical properties of the samples were tested by direct shear and triaxial compression tests. When the designed moisture content w of the sample is lower than the optimal moisture content w, the structural strength of the drying sample is higher than that of the water-added sample, and the brittle failure is more obvious in the drying method, and the shear strength and parameters are larger. This is due to the influence of the gradation properties of the silt and the stress history in the process of sample preparation. When the intended water content of the sample is higher than the optimal water content, the mud particles are easily adjusted, and the deformation and stability process before shearing makes the two sample structures tend to be the same. So that the failure trend and shear strength properties are close to each other. Under the influence of the stress state of the sample in the direct shear and triaxial test and the uniformity of the distribution of clay particles in the water addition method, the change rule of the aggregate strength of silt particles on the shear surface is different with the thickness of the water film. The change rule of shear strength and water addition method parameters differs with the change of w, while the shear strength and drying method parameters decrease with increasing w.

摘要

为研究试样制备条件和试验方法对压实粉土抗剪特性的影响，采用饱和法和烘干法制备了不同含水量的试样。通过直剪试验和三轴压缩试验对试样的抗剪力学特性进行了测试。当试样的设计含水量w低于最优含水量时，烘干试样的结构强度高于加水试样，烘干法的脆性破坏更明显，抗剪强度及参数更大。这是由于粉土的级配特性及试样制备过程中应力历史的影响。当试样的预定含水量高于最优含水量时，土颗粒易于调整，剪切前的变形和稳定过程使两种试样结构趋于相同。从而破坏趋势和抗剪强度特性相近。在直剪和三轴试验中试样应力状态及加水法中土颗粒分布均匀性的影响下，剪切面上粉土颗粒团聚强度的变化规律随水膜厚度不同而不同。抗剪强度及加水法参数的变化规律随w的变化而不同，而抗剪强度及烘干法参数随w增大而减小。

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