High-capacity ribbed pile foundations

This research concerns the influence of ribs on the ultimate capacity of a bored pile in overconsolidated clay. Ribbed bored piles are known to give increased shaft capacity in comparison to conventional straight-shafted bored piles. The investigation seeks to explore the effectiveness of ribs at increasing the ultimate capacity of a pile, and furthermore to understand how this enhanced capacity is derived. The scale pile test results are analysed using several industry standard methods. A plastic failure envelope for the base of the pile rib is identified. This plastic failure envelope is used to provide a detailed design solution for the ultimate capacity of a ribbed pile. The design solution is simple and requires a summation of the constitutive contributions from each rib and from the base and shaft of the pile. This method has been used successfully to predict the ultimate capacity of any pile tested to within ±8%

Failures in transport infrastructure embankments

To ensure that road and rail transport networks remain operational, both highway and railway embankments require continual maintenance and renewal to mitigate against ongoing deterioration and repair any sections damaged by realised failures. This paper provides a review of recent developments in the understanding of highway and railway embankment degradation and failure. Failures due to pore water pressure increase, seasonal shrink-swell deformation and progressive failure are considered. The material composition and construction of highway and railway embankments differ, which influences the dominant type and timing of embankment failure. There is evidence for highway embankment failures induced by pore water pressure increase, but not seasonal deformation and progressive failure. Some railway embankments are susceptible to pore water pressure increase, seasonal shrink-swell deformation and progressive failure due to the age and nature of the dumped clay fill used in their construction. The approaches used to measure and explore embankment failure mechanisms are compared and discussed. Field observations have been used to understand pore water pressure increase and seasonal shrink-swell deformation in embankments, while the investigation of progressive embankment failure has mainly utilised physical and numerical modelling approaches. Further field and laboratory investigation is required before the rigorous analysis of embankment failure can be routinely undertaken. However, progress is being made to empirically identify and evaluate the various risk factors affecting transport infrastructure embankment failure

Compaction monitoring devices for earthworks

SIGLEAvailable from British Library Document Supply Centre- DSC:7768.295(TRL-RR--361) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Stabilized capping layers using either lime, or cement, or lime and cement

SIGLEAvailable from British Library Document Supply Centre- DSC:3425.926(TRL-CR--151) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Multiple tied-back earth retaining structures Results of finite element analyses

SIGLEAvailable from British Library Document Supply Centre- DSC:3425.926(TRL-CR--326) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Determining the age of failure of motorway earthworks from aerial survey photographs

SIGLEAvailable from British Library Document Supply Centre- DSC:7768.29(TRRL-RR--257) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Trial and construction induced blasting vibration at the Penmaenbach road tunnel

SIGLEAvailable from British Library Document Supply Centre- DSC:7768.29(TRRL-RR--181) / BLDSC - British Library Document Supply CentreGBUnited Kingdo