和普通管材相比较，周向强度提高了约36%；轴向强度提高了8%。
As compared with general pipe, its circumferential strength had been improved about 36% and axial strength had been increased 8%.
片状颗粒成分使得南京砂具有各向异性的性质，其水平向强度小于垂直向强度。
Nanjing sand is anisotropic because of the schistous grain. Its horizontal strength is greater than that in vertical.
结果表明：周向剪切应力场可明显改善管材的周向强度，轴向拉伸可实现管材轴向增强。
It was found that the circular shearing and axial tensile increased the circular and axial strength of the pipe, respectively.
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