3DEC modelling of p-y behaviour of laterally loaded piles in jointed rock

摘要

Pile foundations are often employed to provide support for many civil engineering infrastructures to resist lateral loads. For the analysis of laterally loaded piles, the p-y method, also known as subgrade reaction approach, is widely used. Extensive research has been conducted and well established p-y methods based on continuum approach have been developed for soils. For laterally loaded rock socketed piles, the existing p-y methods have extended the continuum theory by adopting rock classification systems such as Rock Mass Rating (RMR) or Geological Strength Index (GSI) to simplify the rock mass to a homogeneous condition. However, rock in reality is a highly discontinuous medium where secondary structures such as fractures and joints are common occurrence. Therefore, the assumption of homogenous and continuum rock condition may not be accurate in modelling the rock mass behaviour. With such limited knowledge, current design methods can either produce conservative or unsafe designs. This implies that further research is required to develop better understanding of the complex p-y behaviour of laterally loaded piles socketed into jointed rock mass.