| 黄轩嘉,岳建伟*,高慧杰,赵丽敏,岳婷婷.制样因素对遗址土力学特性影响的研究[J].实验力学,2022,37(2):263~276 |
| 制样因素对遗址土力学特性影响的研究 |
| Study on the influence of sample preparation factors on the mechanical properties of the site soil |
| 投稿时间：2021-04-07 修订日期：2021-06-18 |
| DOI：10.7520/1001-4888-21-077 |
| 中文关键词: 遗址土 粒径 水样 击实功 力学特性 |
| 英文关键词:site soil particle size water sample compaction work mechanical properties |
| 基金项目:国家自然科学基金(51978634)；河南大学学科培育项目(2019YLZDCG05)；河南省科技发展计划项目(212300410012)资助 |
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| 中文摘要: |
| 不同部位遗址土的盐分、含水率、粒径及微观结构均有一定差异，合理制作遗址土试样是确定遗址土力学特性的关键。本文通过力学性能、SEM测试及数值模拟分析，综合探究水样、粒径、击实功、初始含水率等因素对遗址土力学性能及颗粒结构造成的影响，结果表明，水样对遗址土力学性能产生重要影响，纯水制作的土样抗压强度比原状水制作的土样的强度大15%。随着含水率的增加，0.074mm至2mm粒径试样的强度在增加，增长率基本保持在15%，而0mm至2mm粒径和0mm至0.074mm粒径的试样强度在减小,减小率分别为6%与8%。试验用土的最佳击实功为804kJ/m3，相应的击实次数为每层击实33次。SEM结果发现使用原状水制作的土样比使用纯水制作的土样微孔隙多且具有不同的孔隙特征，其中圆形孔隙多出现于纯水制作的土样，不规则条状孔隙多出现于原状水制作的土样。数值模拟分析发现纯水试样与原状水试样裂隙发展部位、路径不同，纯水试样裂隙演化路径较为清晰，遗址土样裂隙开始于初始缺陷多的部位。本文研究结果可为土遗址的病害机理和安全分析提供一定的依据。 |
| 英文摘要: |
| The salt content, moisture content, particle size and microstructure of different sites are different. The key to determine the mechanical properties of site soil is to make reasonable site soil samples. Through the analysis of mechanical properties, SEM test and numerical simulation, the influence of water sample, particle size, compaction work, initial moisture content and other factors on the mechanical properties and particle structure of the site soil is comprehensively explored. The results show that the water sample has an important influence on the mechanical properties of the site soil. The compressive strength of the soil sample made of pure water is 15% higher than that of the soil sample made of undisturbed water. With the increase of moisture content, the strength of samples with particle size of 0.074mm to 2mm increases, and the growth rate basically remains at 15%, while the strength of samples with particle size of less than 2mm and less than 0.074mm decreases, and the reduction rates are 6% and 8%, respectively. The best compaction work of the soil is 804kJ/m3, and the corresponding compaction times is 33 times per layer. SEM results show that there are more micropores in undisturbed water samples than in pure water samples, and these micropores have different pore characteristics. Among them, the round pores are mostly in pure water samples, and the irregular strip pores are mostly in undisturbed water samples. The numerical simulation analysis shows that the crack development position and path of pure water sample are different from that of undisturbed water sample. The crack evolution path of pure water sample is relatively clear, and the crack of site soil sample begins at the position with many initial defects. The results provide a basis for disease mechanism and safety analysis of earthen sites. |
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