Stability of a loaded pile adjacent to a slurry-supported trench

Author:

Choy C. K.1,Standing J. R.2,Mair R. J.3

Affiliation:

1. Geotechnical Consulting Group London, UK (formerly Department of Engineering, University of Cambridge, UK)

2. Department of Civil and Environmental Engineering, Imperial College London, UK

3. Department of Engineering, University of Cambridge UK

Abstract

Diaphragm walls are used to support the sides of deep excavations, and they are often installed close to existing buildings. Construction of these cast-in-place permanent retaining structures can result in substantial soil deformations and potential damage to adjacent structures. A better understanding of this soil–structure interaction problem would greatly benefit safe and economic design. There is particular uncertainty about the interaction and response of piled foundations to diaphragm wall construction, particularly where there could be trench instability at depth. A series of small-scale model tests has been conducted using the 8 m diameter geotechnical centrifuge at Cambridge University to study the installation effects of diaphragm walls on a single adjacent pile in dense fine sand. An instrumented model pile was installed and loaded at various offsets from a slurry-filled model trench. Two trench lengths were investigated. The tests have provided a detailed insight into the movements of the pile and the progressive redistribution of loads along the pile. A generalised mechanism for the pile–trench interaction is also proposed. The main factors affecting the severity of pile response are slurry level (trench pressure), pile offset distance (α) and trench length (L). The experiments showed that the risk of system instability reduced significantly with x/L values above 1·15.

Publisher

Thomas Telford Ltd.

Subject

Earth and Planetary Sciences (miscellaneous),Geotechnical Engineering and Engineering Geology

Reference20 articles.

1. Choy C. K. Installation effects of diaphragm walls on adjacent piled foundations. PhD dissertation, 2004, University of Cambridge, UK.

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