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膨胀土具有吸水膨胀的工程特性,因而通常采用的有侧限膨胀试验具有一定局限性。采用应变控制式三轴仪来实现对膨胀土试样压力的连续施加,使土样在合理的受力和吸水环境下,膨胀变形至剪切破坏;并根据相关物理性质指标转换公式,得到试样在连续性吸水过程中不同含水量与体积膨胀率的关系。改进后的三轴膨胀试验合理地模拟了膨胀土在一定埋深条件下其吸水膨胀的真实过程,科学地解决了分阶段有侧限膨胀试验不能实现同一试样吸水膨胀的连续性过程问题,试验结果更为准确,使得室内试验环境和工程实际达到较好吻合,对于研究膨胀土的力学行为具有一定的合理性和科学性。
Expansive soil has the engineering characteristics of water swelling, and therefore often used to limit the expansion test has some limitations. The strain control triaxial apparatus is adopted to realize the continuous application of the pressure of the expansive soil sample so that the soil sample can expand and deform to the shear damage under the reasonable stress and water absorption environment. According to the conversion formula of the related physical property index, Relationship between different water content and volumetric expansion rate during continuous water absorption. The improved triaxial expansion test reasonably simulates the real process of expansive soils swelling under a certain depth, and scientifically solves the problem of the continuity process that the confined expansive test can not achieve the same sample ’ The test results are more accurate, making the indoor experimental environment and engineering practice to achieve a better match, for the study of mechanical behavior of expansive soils with a reasonable and scientific.