Analysis On Reasonable Value For Anti-floating Design Head Of The Rock Foundation Pit Basement

This paper mainly focuses on rock foundation pit basement anti-floating designhead values of the flat topography and slope topography. Through theoretical analysisextremely rainstorm conditions during construction, derives the anti-floating head valueformula to design and construction based on the findings, takes the appropriateanti-floating measures to meet practical needs.First of all, this paper analyzes the rock foundation pit of the geological features,groundwater occurrence and sources, describes the influence of backfill to anti-floatingdesign of underground structures, groundwater seepage characteristics and fundamentallaw.Secondly, by studying the calculation method of foundation pit water tableincrements, gives a formula of the flat landscape of rock foundation pit constructionanti-floating head values during construction, and quantitative analysis of anti-floatinghead values under different conditions.Thirdly, for slope landform characteristics of rock foundation pit, according to thebasic principle of percolation flow mechanics and fluid mechanics, the two-dimensionalsteady flow as the premise, gets the head calculation model under the condition ofrainfall, as a basis for subsequent analysis.Fourthly, making the test model, the slope and rainfall as variables, Simulation ofrock slope landform of backfill around the basement of foundation pit water levelchanges, improves head curved model, streamlines head value formula.Fifthly, with GeoStudio software to analysis of the simulation experimentcondition, verifying the rationality of the simplified-floating-head value.Finally, Combination of Qingdao Laoshan Public Cultural Center engineering,through measurement of its anti-floating-head values, to analyze the rationality ofanti-floating design, and verify anti-floating head formula practicality.