某地下构筑物上浮事故分析及处理

Analysis and dispose of floating accident of a underground structure

深埋于弱透水性地层中的某地埋式水泵房因受连续大雨影响,地下水位上涨,在地下水浮力作用下不均匀上浮,严重倾斜.通过现场观测及抗浮验算判断结构为整体上浮破坏,根据其所处地形地貌及工程地质和水文地质条件,通过分析其上浮原因是施工时基坑'肥槽'回填不符合要求、设计未考虑因施工不规范而造成结构所处水文地质条件变化产生的浮力,为此提出了对地下水泵房进行抗浮加固处理的措施,并针对埋置于弱透水地层中的地下建(构)筑物的抗浮问题,对设计和施工中的关键技术进行了总结.

A Buried pump house buried in a weakly permeable formation is affected by continuous heavy rain,and the groundwater level rises.It floats unevenly under the buoyancy of groundwater and is heavily tilted.Through on-site observations and anti-flotation calculations,it is judged that the structure is an overall floating damage,and according to the topography and topography and the engineering geology and hydrogeology conditions in which it is located,The reason for the upwelling is that the backfilling of the'fertilizer trough'in the foundation pit does not meet the requirements during construction,and the buoyancy caused by the changes in the hydrogeological conditions of the structure due to non-standard construction is not considered in the design.Because of that,the measures of reinforcing underground water pump house against flotation are put forward.Furthermore,this paper summarizes the key technologies in the design and construction of underground structures buried in weak permeable strata.