附加的张性应力相当于减小围压。
Such additional stress may be explained as caused by the decrease in confining pressure.
最后讨论了摩阻系数对张拉控制应力的影响，提出现场测试的一般性原则和要求。
Finally, the influence of frictional resistance factors on the controlled tensioned stress is discussed and the general principle and requirements of field measurement are presented.
周向正应力是张性的。
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