Publication Abstract

Proceedings - Fifth International Conference & Exhibition on Piling and Deep Foundations, 1994, Bruges, Belgium, (DFI)

Drilled-grouted piles in thick loess in China
T. Huang, G. Sui, S. Lius & X. Chen

A large area in northwestern China is covered by collapsible loess strata, many of which have a great thickness. As an important of kind foundation soil in china, its collapsibility has caused a lot of damage and is a potential risk. In thick loess region, an effective method is to use large-diameter and deep piles penetrating the collapsible strata and transmitting loads to a stable terrain. But the water-sensitive loess with large thickness bring a series of theory and practice questions for pile design and test. This paper outlines the loess characteristics and its assessment in china, and then expounds the essential problem and their solution for pile design, such as the main working conditions of pile in loess, pile bottom supporting sublayer requirement, considering negative friction influence, and so on. Standing on three power scale imitative tests, the paper analyses the process of negative friction occurring, extending, changing and disappearing, and gives a simple conclusion for design and test of piles in thick loess.

 article #847; publication #36 (IC-1994)