The Influence Of Rain On The Anti-floating Water Level Of Gentle Slope And The Calculation Of Substrate Buoyancy

With the development of urbanization,and in order to avoid large quality of cultivated land occupied at the same time,more and more buildings are built on the certain gentle slope.In the process of advancing urbanization,a large number of high-rise building were first built,in order to satisfy the design of civil defence fortifications,underground garage,relevant facilities,in the design of the basement base,the basement anti-floating water level must be considered.Most of the existing anti-floating water level design relies on years of groundwater level monitoring data or familiarity with the geological conditions of the entire area of the site.However,many design companies can’t meet the content.So how to rely on the existing meteorological data and survey design data to determine the anti-floating water level has become an urgent problem to be solved.This article selects a site for this problem,and analyzes the impact of the groundwater level and the site of the regional conditions.The Geo-Studio finite element calculation software was used to analyze the changes of seepage field and the relationship between rainfall and groundwater recharge in gentle slope under different rainfall conditions.Then the changes of seepage field in gentle slope of different slope under the same rainfall condition are analyzed.In the end,the groundwater seepage of the basement floor of the gentle slope zone is calculated after the anti-floating level is determined.Research efforts have carried on as follow:1.Analyzing the geological characteristics,the form and source of groundwater and the source of the groundwater,and the main factors influencing the groundwater in the area are the rainfall;2.Using two-dimensional finite element analysis the changes in the gentle slope seepage field and water table line under different rainfall conditions,and the changes of the volumetric water content and the pore water pressure in the gentle slope were analyzed with the changes of rainfall,rainfall intensity and rainfall duration during the rainfall.The migration law of infiltration rainwater is studied.Analysis and calculation results:the higher the rainfall intensity,the easier the formation of runoff on the slope,the smaller impact on the vertical depth of the slope,causing the foot level of the groundwater level rise height is smaller;the smaller the rainfall intensity,the longer the rainfall,the rain easily into the slope,infiltration depth is also greater,causing a higher groundwater level.3.The results show that the higher the slope,the more difficult the rain is on the slope,the smaller the depth of the slope,the smaller the depth of the slope,the groundwater level at the foot of the slope,the lower the slope of the groundwater level The lower the elevation after analyzing the changes of groundwater level in gentle slope under different rainfall intensity.4.Using the determined gentle slope anti-floating level,the size of the pore water pressure in the basement at the water level and the head difference is calculated and compared with the calculated result using the improved resistance coefficient method.The results show that the calculation error is small.The formula can be used to calculate the buoyancy size of the basement floor in that case.