There are many issues surrounding the performance of critical assets on high-speed ballasted railway lines.At assets like switch & crossings and bridge transitions high track forces can be produced resulting in hi...There are many issues surrounding the performance of critical assets on high-speed ballasted railway lines.At assets like switch & crossings and bridge transitions high track forces can be produced resulting in higher ballast settlements and hence track misalignments.The latter result in higher track forces and hence more settlement,leading to the need for increased track maintenance to ensure comfort and safety.Current technologies for solving issues like ballast movement under high-speed loading regimes are limited.However,a technique that has been well used across the UK and now increasingly overseas to stabilise and reinforce ballasted railway tracks is the application of in-situ polyurethane polymers,termed XiTRACK.This paper discusses how this technique can be used to solve these types of long-standing issues and presents actual polymer application profiles at two typical critical sites,namely a junction and a transition onto concrete slab-track.展开更多
Coal beds rank among the weakest components of carboniferous rock massif in Upper Silesian coal basin. At present chemical grouting is being used in mining for reinforcing and stabilizing of rock strata. Due to low vi...Coal beds rank among the weakest components of carboniferous rock massif in Upper Silesian coal basin. At present chemical grouting is being used in mining for reinforcing and stabilizing of rock strata. Due to low viscosity of a majority of chemical grouting means they are preferably applied for reinforcing of cracked rocks and coal seams. Reinforcing coal seams by means of chemical grouting, the properties and behaviour of coal seams grouted in this way are largely changed. This contribution deals with some laboratory results of grouted sample failure testing by which the effect of reinforcement grouting has been elucidated from the point of view of rock burst control.展开更多
基金Project (No. EP/H027262/1) partially supported by the Engineering and Physical Sciences Research Council,UK
文摘There are many issues surrounding the performance of critical assets on high-speed ballasted railway lines.At assets like switch & crossings and bridge transitions high track forces can be produced resulting in higher ballast settlements and hence track misalignments.The latter result in higher track forces and hence more settlement,leading to the need for increased track maintenance to ensure comfort and safety.Current technologies for solving issues like ballast movement under high-speed loading regimes are limited.However,a technique that has been well used across the UK and now increasingly overseas to stabilise and reinforce ballasted railway tracks is the application of in-situ polyurethane polymers,termed XiTRACK.This paper discusses how this technique can be used to solve these types of long-standing issues and presents actual polymer application profiles at two typical critical sites,namely a junction and a transition onto concrete slab-track.
文摘Coal beds rank among the weakest components of carboniferous rock massif in Upper Silesian coal basin. At present chemical grouting is being used in mining for reinforcing and stabilizing of rock strata. Due to low viscosity of a majority of chemical grouting means they are preferably applied for reinforcing of cracked rocks and coal seams. Reinforcing coal seams by means of chemical grouting, the properties and behaviour of coal seams grouted in this way are largely changed. This contribution deals with some laboratory results of grouted sample failure testing by which the effect of reinforcement grouting has been elucidated from the point of view of rock burst control.
