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首页> 外文期刊>Proceedings of the Institution of Civil Engineers. Geotechnical Engineering >Design and measurement of piled-raft foundations
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Design and measurement of piled-raft foundations

机译：桩筏基础的设计与测量

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摘要

Piled-raft foundations for multi-storey buildings have been employed widely in Shanghai since the 1990s. However, there has been a lack of long-term studies on load distribution, and few improvements have been made to foundation design over the years. The goal of this paper is to extensively analyse long-term data on three multistorey residential buildings with piled-raft foundations to propose an improved design method that has the potential to reduce construction costs. One six-storey building was monitored between 1999 and 2011, and two other six-storey buildings between 1991 and 1995. Parameters analysed over time in this study include pile-raft tests, measured data for load distribution on top of the pile group, ground pressure distribution and the settlement of the buildings. Pile spacing was found to be the key parameter for load sharing between the piles and the soil. The proposed design model accounts for observed load sharing between the piles and the soil and divides the settlement prediction into three steps for a more accurate representation of how settlement proceeds as buildings with piled-raft foundations age. By using the proposed method, safety factors can be calculated more efficiently, which it is expected will lead to reduced construction costs.
机译：自1990年代以来，多层建筑的桩筏基础已在上海广泛使用。但是，缺乏对负荷分配的长期研究，并且这些年来对基础设计的改进很少。本文的目的是广泛分析具有桩筏基础的三座多层住宅建筑物的长期数据，以提出一种可能降低建筑成本的改进设计方法。在1999年至2011年期间，对一栋六层建筑物进行了监视，在1991年至1995年之间，对另外两栋六层建筑物进行了监视。在此研究中，随时间推移分析的参数包括桩筏测试，桩群顶部荷载分布的测量数据，地面压力分布和建筑物沉降。发现桩间距是桩与土之间分担荷载的关键参数。拟议的设计模型考虑了桩与土壤之间观察到的荷载分担，并将沉降预测分为三个步骤，以更准确地表示随着桩基基础老化的建筑物沉降如何进行。通过使用所提出的方法，可以更有效地计算安全系数，可以预期这将减少建筑成本。

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