基于地质条件的海河流域千米级基岩标施工技术探讨

Construction technology of kilometer-level bedrock markers based on geological conditions of Haihe River basin

天津市海河流域东部平原区地面沉降严重且覆盖层深厚,为在此地形条件下完善流域高程系统的构建,新修建团泊洼水库、庆云水文站、献县水文站、新盖房水文站4处千米级基岩标,并完成基岩标水准网初始测量及重点水工建筑物水准校测工作。据查,这4处基岩标深度将在相当一段时间内名列世界前四。千米级基岩标施工难度大、技术要求高,在国内外均为罕见,针对其工程选址、建造工艺、孔斜控制及岩体稳定性等进行详细讨论,为类似施工提供宝贵经验。

In the eastern plain area of the Haihe River basin of Tianjin,the ground subsidence is serious and the overbunlen layer is deep.To improve the construction of the watershed elevation system under this terrain condition,four kilometer-level bedrock markers were built for Tuanbowa Reservoir,Qingyun hydrology station,Xianxian Hydrology Station,and Xinjiafang hydrology station,and complete the bedrock the leveling network initial measurements and key hydraulic structure level testing work.According to the investigation,the depth of these four bedrock markers will be ranked in the world's top four for a considerable period.The construction of kilometer-level bedrock is extremely difficult and requires high technology,which is rare at home and abroad.This paper discusses in detail site selection,construction technology,hole slope control,and rock mass stability,which can provide valuable experience for the subsequent construction.