New challenges in construction mechanicsof urban rail transit
2016
This paper aims to raise concerns about construction mechanics.
Firstly, operating railway transit at present and scales of ongoing
rail transit projects are briefly introduced. Then, major constraints
of urban rail transit construction are analysed in two aspects, including
complexed geology conditions and strict environmental requirements.
Difficulties caused by geology conditions contains excess settlement
and overall failure in very soft soil, the delayed ground collapse
and cutter wear of shield tunnelling in sandy cobble stratum, construction
safety threats in complex stratum, water bearing stratum and gas-bearing
stratum. About environmental restrictions, difficulties of constructions
crossing existing railways, buildings and cultural relics are summarised.
These difficulties challenge construction mechanics in failure behavior
descriptions and calculation precisions. In the end, this paper considers
that breakthrough in construction mechanics should be seek in mechanical
models, shakedown solutions subjecting slight dynamic load, and multi-factor
forecasting models.
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