土-水特征曲线测定过程中潜在影响因素与异常现象研究

发布时间：2018-05-21 07:25

本文选题：SWCC + 压力板仪　；参考：《岩土力学》2014年02期

【摘要】：基于压力板仪对相同制样参数的4个环刀试样与12个三轴试样进行土-水特征曲线(SWCC)试验,研究影响试验的各种潜在因素以及相关的异常现象。试验结果表明:即便是相同条件制备的试样,其SWCC之间也会存在差异性,这种差异与土的颗粒级配不良有直接关系,而与平衡时间无关;蒸发效应在SWCC试验中持续存在,并在平衡后期成为失水的主要因素,因此,对平衡条件应适当修正;试样的侧面防护对试样的SWCC影响显著,特别对于大高径比试样,蒸发效应将因其侧面防护脱离而成为失水的主要因素,严重影响SWCC的试验结果;横向裂纹这一异常现象并未影响SWCC测量结果,但其产生机制却可能反应了轴平移技术的不足,值得进一步研究。根据上述研究结果和其他相关试验成果,对SWCC试验提出建议和改进方法。
[Abstract]:The soil-water characteristic curves of 4 annulus and 12 triaxial specimens with the same parameters were tested by pressure plate instrument. The potential factors affecting the test and the related abnormal phenomena were studied. The results show that even the samples prepared under the same conditions have different SWCC, which is directly related to the poor particle gradation of the soil, but not to the equilibrium time, and the evaporation effect persists in the SWCC test. Therefore, the balance condition should be modified properly, the side protection of the specimen has a significant effect on the SWCC of the sample, especially for the specimen with large aspect ratio. The evaporation effect will become the main factor of water loss due to its side protection, which will seriously affect the test results of SWCC. The abnormal phenomenon of transverse crack does not affect the measurement results of SWCC, but its mechanism may reflect the insufficiency of axial translation technique. It is worth further study. According to the above research results and other related experimental results, suggestions and improvement methods for SWCC test are put forward.
【作者单位】：大连理工大学建设工程学部土木工程学院;大连理工大学岩土工程研究所;大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家自然科学基金资助项目(No.51179023)
【分类号】：TU43

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