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An investigation into the vertical axial capacities and groundwater cut-off capabilities of secant pile walls

机译：割线桩墙的竖向轴向承载力和地下水截流能力的研究

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摘要

Secant pile walls are increasingly becoming popular groundwater cut-off systems of choice on underground construction sites, as they offer a number of advantages over traditional sheet piling and diaphragm walls. However, some elements of uncertainty surround the design and construction of secant pile walls. Vertical and horizontal installation tolerances are major issues, especially in the case of multi-level basements, as required tolerances are difficult to achieve with deep piles associated with deep basements. In addition, while conventional foundation piles are routinely statically or dynamically load-tested, hard piles in secant pile walls are rarely axially tested and this does not allow for the routine verification of existing design methods and assumptions. This paper presents the design, construction and testing of the secant pile wall on a 3-4 level basement construction scheme in Central London. Simple empirical correlations for estimating the geometry of secant pile walls for effective groundwater cutoff are derived and validated. An alternative approach for estimating the vertical capacities of secant pile walls is also presented and compared with a common routine method in the industry. The alternative method is shown to be less conservative than the common industry approach, while predictions are also in good agreement with results of a recent series of model tests on perimeter pile groups.
机译：正割桩墙正日益成为地下建筑工地上首选的地下水截流系统，因为它们比传统的板桩和隔板墙具有许多优势。但是，割线桩墙的设计和施工仍存在一些不确定因素。垂直和水平安装公差是主要问题，尤其是在多层地下室的情况下，因为与深地下室关联的深桩很难达到所需的公差。另外，尽管常规地基桩例行地进行了静态或动态载荷测试，而割线桩壁中的硬桩却很少进行轴向测试，这不允许对现有设计方法和假设进行常规验证。本文介绍了伦敦市中心3-4级地下室施工方案中的割线桩墙的设计，施工和测试。推导并验证了简单的经验相关性，用于估计割线桩壁的几何形状以有效截断地下水。还提出了用于估计割线桩墙的竖向承载力的另一种方法，并将其与业内常用的常规方法进行了比较。事实证明，替代方法不如一般行业方法保守，而预测结果也与最近对周边桩组进行的一系列模型测试的结果一致。

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