In this paper, we present some work on the surface instability of elastic half Spaces.

本文综合报道有关弹性半无限体表面稳定性的若干工作。

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An analysis of surface instability of an incompressible half space under biaxial loading is summarized, and the critical condition for the onset of surface buckling is given.

对于不可压缩弹性半无限体，概述在双向受载下自由表面的失稳分析，给出失稳的临界条件。

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Preexisting research shows that there are three main factors that affect the borehole stability of Air-Drilling: mechanical reason, hydration reason and the Weaked surface instability reason.

研究表明，影响空气钻井井壁稳定的主要因素有三个：力学不稳定，水化不稳定和岩体破裂或弱面不稳定。

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But at the same time, there is a lot of instability below the surface, where different age groups are grinding against one another like shifting tectonic plates.

ECONOMIST: The digressions of people power

Engineers have now said it cannot carry traffic due to the "potential instability of the road surface".

BBC: Leaderfoot Bridge closed for weeks

She told him (and the rabbits that sometimes surreptitiously accompanied the riders) that people were becoming more and more unbalanced: studies had proved it, which led the psychiatrist to conjecture that perhaps mental instability was not so much a disease as a stratum of normality, just below the surface of normality as it was commonly conceived.

NEWYORKER: The Insufferable Gaucho