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介绍劲性微型桩在地下洞室塌陷事故中的应用，劲性微型桩因其桩内型钢刚度大、承载力高，能克服因地基局部软弱而产生的缩颈及断桩对其承载力的影响，在地基加固及基础托换中应用前景较好。
The application of compact micro-piles in the collapse of underground caverns is introduced. Because of the large rigidity and high bearing capacity of compact steel in piles, the micro-piles can overcome the necking caused by local softness of the foundation and the bearing capacity of broken piles. Impact, the application prospects in foundation reinforcement and foundation underpinning are better.