摘要
Abstract
As the primary expression of subterranean karst landscapes,a solution-cavity evolves through three distinct stages.During the inception phase,groundwater percolates slowly through tight fissures;purely chemical dissolution gradually enlarges the conduits.In the mature phase,the enlarged apertures cause a marked increase in flow velocity,especially during rainy seasons when sediment-laden water exerts simultaneous chemical corrosion and pronounced mechanical abrasion,further widening the cavity walls.In the final phase,tectonic uplift,capture of underground streams,or regional water-table decline drains the original conduits,leaving behind a relict cavern.South China,with abundant rainfall and vigorous groundwater circulation,hosts dense clusters of such cavities.Pile construction in these terrains encounters high geologic heterogeneity and elevated risks of water and mud inrush,rendering engineering outcomes highly uncertain.Establishing accurate and reliable methods for calculating pile bearing capacity is therefore essential.Against this backdrop,the present paper first summarizes the ground conditions typically encountered when founding piles in cavernous karst.It then reviews recent advances in bearing-capacity assessment techniques—ranging from physical modelling tests and numerical simulations to theoretical closed-form solutions—and evaluates the applicability of these approaches to estimating the vertical bearing capacity of piles in karstic settings.关键词
溶洞/发育区/桩基/竖向承载力Key words
Limestone cave/Development area/Pile foundation/Vertical bearing capacity分类
建筑与水利
