A new, alternative approach in triaxial setup to fully determine small-strain cross-anisotropic elastic parameters is proposed, which require neither radial strain sensors nor radial loading process. This was made possible by additionally measuring the pore water pressure responses during undrained axial loading, and inputting it into theoretical expressions derived based on cross-anisotropic elasticity theory. Although the method is intended for saturated soils, slight undersaturation in the system is accounted for by incorporating the pore water pressure coefficient B into the parameter deduction process. Being free from the cumbersome radial sensors and ultra-precise cell pressure controlling devices/operations, the proposed method is applicable even in less specialised laboratory. Four different deduction routes of elastic parameters were applied to results from tests on two reconstituted fine-grained soils. The horizontal Young's modulus obtained with the newly proposed method is consistent not only with those based on radial measurements but also with that directly measured by axial loading on horizontally-cut specimens. A challenge is still left on precisely determining Poisson's ratios, which exhibited only partial matching between different measurement methods. On the whole, however, the proposed method is consistent with those adopting full local instrumentation.

中文翻译：

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三轴试验中获取各向异性各向异性弹性参数的另一种方法

提出了一种在三轴设置中完全确定小应变跨各向异性弹性参数的新方法，该方法既不需要径向应变传感器，也不需要径向加载过程。通过额外测量不排水轴向载荷过程中的孔隙水压力响应，并将其输入基于交叉各向异性弹性理论得出的理论表达式中，可以实现这一点。尽管该方法适用于饱和土壤，但通过结合孔隙水压力系数B可以解决系统中的轻微欠饱和问题进入参数推导过程。由于没有繁琐的径向传感器和超精密的细胞压力控制装置/操作，因此所提出的方法甚至适用于不太专业的实验室。在两种重构的细粒土壤上的试验结果采用了四种不同的弹性参数推导途径。通过新提出的方法获得的水平杨氏模量不仅与基于径向测量的模量一致，而且与通过水平切割试样的轴向载荷直接测量的模量一致。精确确定泊松比仍然存在挑战，泊松比在不同测量方法之间仅表现出部分匹配。但是，总的来说，所提出的方法与采用完全本地仪器的方法是一致的。