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由于黏土黏性大、受扰动易产生裂隙,采用常规的击实法和固结法所制备的空心圆柱试样存在整体不均匀、饱和度较低、切削面裂隙丰富等问题。在重塑试样击实器的基础上,研制了一种能制备实心与空心圆柱重塑试样的压样装置,可以很好地模拟天然状态下土体形成过程。依据改进的分层欠压法,试验选取最优初始欠压系数,在每层试样高度相同的条件下,严格控制每层试样的质量,而后采用抽气饱和法将所压制的试样进行饱和。通过应力路径三轴试验和纯主应力轴旋转试验,从可重复性和力学特性两个方面验证了所制备的饱和重塑黏土试样用于研究复杂应力路径下土体变形特性与本构关系的可靠性,为后续重塑土的理论与试验研究提供了重要的保证。
Due to the large clay viscosity and easy to crack due to the perturbation, hollow cylindrical specimens prepared by conventional compaction and consolidation methods have the problems of overall unevenness, low saturation and rich fissures in the cutting face. On the basis of remodeling of sample compacter, a kind of sample-pressing device that can prepare solid and hollow cylindrical remodeling samples was developed, which can well simulate the formation of soil under natural conditions. According to the improved stratified undervoltage method, the optimal initial undervoltage coefficient is selected. Under the condition of the same height of each layer, the quality of each layer is strictly controlled. Then, the compressed sample Saturated. Through the stress path triaxial test and the pure principal stress axis rotation test, the prepared saturated plastic clay sample was verified from the aspects of repeatability and mechanical properties to study the deformation characteristics and constitutive relationship of soil under complex stress path The reliability of the soil for the subsequent rebuilding of the theory and experimental study provides an important guarantee.