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利用电子天平和游标卡尺对长方体型的灰质泥岩试件浸水后不同时段的质量以及长、宽、高3个方向上长度进行了测量,分析了灰质泥岩的膨胀应变与其体积含水率、质量含水率及浸水时间之间的关系.结果表明:灰质泥岩膨胀应变与岩石的体积含水率及质量含水率成正比关系;灰质泥岩膨胀应变具有时间效应,据此提出了岩石膨胀稳定的时间阈值概念,得出了灰质泥岩的膨胀应变与浸水时间的函数关系,并推导了侧限条件下岩石的轴向自由膨胀应变随时间的变化规律,该结论对工程实践有指导意义.
The mass, length, width and height of rectangular parallelepiped gray mudstone samples after soaking in water were measured by electronic balance and vernier caliper. The swelling strain of gray mudstone and its volumetric water content, mass moisture content and The results show that the expansion strain of gray mudstone is directly proportional to the volumetric water content and mass moisture content of rock, and the time-dependent effect on the swelling strain of gray mudstone is given. The relationship between the expansion strain of gray mudstone and the immersion time is deduced, and the law of the axial free expansion strain of rocks under lateral confining conditions with time is deduced. This conclusion is instructive for engineering practice.