The Influence of Bias Pressure of Loess Tableland Slope on Adjacent Subway Deep Foundation Pit
In order to study the deformation and stress characteristics of stratum and support structure of deep foundation pit in loess area under the action of bias pressure of adjacent loess tableland slope,this paper takes the typical section of a subway shaft foundation pit in Xi'an area as the research object to establish the numerical analysis model of bias pressure condition of loess tableland slope and the comparative analysis model of non-bias pressure condition under the same stratum and support parameters,and makes an in-depth study based on the actual monitoring data of construction site.The results show that the deformation trend of the surrounding strata and support structure of the foundation pit has changed significantly due to the influence of the bias pressure of the loess tableland slope,the horizontal displacement trend of the pile body is significantly different from that of the non-biased load foundation pit,the support pile body far from the slope has horizontal deformation towards the outer side of the foundation pit,but the overall displacement difference is small.It shows that the design scheme of the foundation pit support structure can meet the safety requirements of the foundation pit itself and the surrounding environment under the condition of bias pressure of the loess tableland slope.
loess tableland slopeadjacent subwaydeep foundation pitbias pressuresupport structurefinite element analysis
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