Research on design and construction scheme of underground deep buried stations under complex karst and pressure water conditions
Purpose in the past decade,a large number of urban rail transit projects have been constructed and put into op-eration in China.The smooth construction and safe operation of underground tunnels and stations are closely related to un-derground geological conditions.Among various geological conditions,the impact of complex karst and karst water on un-derground engineering is the most unfavorable,especially under the conditions of complex karst development and high pressure karst water,the construction of underground deep buried station projects is the rarest,most difficult and risky.Therefore,it is necessary to conduct in-depth research and summary on the design scheme and construction technology of underground stations under such geological conditions.Research conclusions:The groundwater stored in limestone caves and fissures under aquitards has obvious pressure bearing and heterogeneity,and is significantly enhanced by dissolution at rock interfaces,often exhibiting characteristics of pressurized pipeline flow.The design of underground stations under complex karst and karst confined water conditions adopts a comprehensive design scheme of"external interception and in-ternal drainage,zoning implementation,setting up grouting interception curtains+pit bottom treatment+pressure relief drainage wells",which is feasible and effective.According to the drilling situation,chemical grouting can significantly improve the pile forming rate of support piles.Experience can be used as a reference for other similar work sites.
deeply buried stationscomplex karsthigh-pressure waterexternal interception and internal dischargeen-closure structure
万方数据
维普
