In this paper the relation between the hole diameter and the pile thickness of the jet on the hole bottom for a jet penetrating or drilling process is theoretically examined.

本文在理论上探讨了射流在侵彻或钻孔过程中，孔径和射流在孔底的堆积厚度之间的关系。

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When the thickness of Karst roof is not enough, the stability of rock_socketed pile foundation should be analyzed and discussed.

当桩基作用在岩溶顶板上且岩溶顶板厚度不是足够厚时，需对嵌岩桩桩基的稳定性进行分析与讨论。

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So under the condition of flexible foundation, the optimization of cushion thickness of CFG pile composite foundation with caps is of great significance.

因此，对于柔性基础条件下CFG桩桩帽复合地基褥垫层厚度的优化十分有意义。

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