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。
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。
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；
The Shanghai area belongs to high moisture content and high compressible soft soil geological structure. The cost of foundation pit support holds larger proportion of construction installation cost.
上海地区属高含水量、高压缩性软土地质，基坑支护费用占建安造价较高比例。
Due to a lack of experience of performing construction in soft soil areas, serious displacement of the foundation piles took place after the excavation of foundation pit started.
由于缺乏软土地区施工经验，在基坑开挖后，基础桩发生了严重位移。
The support structure during the excavating of deep foundation pit is difficult, especially in the dense buildings, high groundwater level and thick soft soil area.
深基坑开挖支护是基坑施工的重点，尤其是在建筑密集、地下水位高、厚软土地区的深基坑支护，更是工程界关注的难题。
Foundation pit project of Zhengda Plaza in Pudong New Area is one of the macro-type deep foundation pit engineerings in soft soil foundation of Shanghai area.
上海浦东正大广场基坑工程是上海地区软土地基中特大型深基坑工程。
The seepage of foundation pit is one of the important factors that can cause soil collapse and structure failure in soft soil.
软土地基中基坑渗流诱发的土体破坏是引起基坑工程事故的一个重要因素。
In a foundation pit in soft soil area, gravity retaining wall with diagonal bracing is used as well as those without bracing.
在软土地区一大型基坑中，同时采用了竖向斜撑对水泥搅拌桩重力式挡土墙进行加强和单纯采用重力式挡土墙两种基坑围护形式。
The application of leading pile wall to the foundation pit of soft soil braced by soil nails expands the application range of soil nail bracing technique.
超前桩墙在软弱土基坑土钉支护中的应用，扩展了土钉支护技术的适用范围，但国内外对其作用机理的研究甚少。
However, when it is used in soft soil, particular attention should be paid to "time-space effect" and foundation pit will have big slope displacement and bound...
但在软弱土层中采用尤其要重视“时空效应”，且基坑边坡的位移及周边的沉降较大。
However, when it is used in soft soil, particular attention should be paid to "time-space effect" and foundation pit will have big slope displacement and bound...
但在软弱土层中采用尤其要重视“时空效应”，且基坑边坡的位移及周边的沉降较大。
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