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本文根据对一种心墙原土的三轴拉伸试验中试样变形过程及断裂形式的描述与分析,提出如下看法:随着周围压力的不同,试样的破坏可以表现为纯拉断、先剪切伸长后拉断、纯剪切三种形式。一般所用公式(文中式(1))只能用于纯拉断形式。而对先剪切伸长后拉断形式的试样,要考虑周边剪切的影响,才能得出真正的抗拉强度。对于表现为纯剪切破坏形式的试样,不能从成果中引出抗拉强度。对于高围压作用下,试样发生断裂破坏的现象作了解释。
Based on the description and analysis of the deformation process and fracture form of a specimen in the triaxial tensile test of a core wall original soil, this paper proposes the following observations: With the different ambient pressures, the failure of the specimen can be expressed as a pure tensile fracture. First, after shear elongation, pull off, pure shear three forms. The general formula used (text (1)) can only be used for purely broken forms. However, for the specimen that has been sheared and stretched and then pulled off, the influence of the peripheral shear must be considered in order to obtain the true tensile strength. For specimens that exhibit pure shear failure, tensile strength cannot be extracted from the results. For the effect of high confining pressure, the phenomenon of fracture and destruction of the sample was explained.