Through a case of foundation pit, the excavation construction technique of complex soft soil foundation pit with super deep foundation "pit-in-pit" was introduced in the paper.

通过基坑工程实例，介绍带有超深坑中坑的复杂软土基坑的挖土施工技术。

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The excavation of deep foundation pit in soft soil region is comprehensive difficulty in geotechnical engineering.

软土地区深基坑开挖是基础和地下工程施工中一个综合性岩土工程难题。

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Piles under the bottom of a pit are always subject to deflection due to excavation-induced soil movement on soft foundation.

软弱地基开挖，流动土体对坑内桩基推挤，导致桩基偏位；

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