Research On The Soil Pressure Of Pile For Deep Excavation In Loess Area

With the rapid development of our national economy, accelerating the urbanization process of city construction, the status in the national economy more significant.as city high-rise buildings, subway engineering, municipal engineering and underground space development scale enlarging, produced a considerable amount of deep foundation pit engineering, and which scale and depth has also increased. Deep foundation pit engineering is strong regional, personality, time effect and the space effect of systems engineering, mainly reflects in geotechnical properties, design, construction technology and process of interaction and mutual constraint, mutual influence, etc. A lot of practice shows that the traditional soil pressure applied in different areas, may have caused a large waste or exist great potential safety problems, finding out the soil pressure characteristics of different regions is necessary for scientific designing and investment saving.Based on pipe jacking working pit of Xi'an Dongyue Road which have Deep foundation pit supporting with sparse arrangement pile foundation and steel supported beam, soil pressure of pile in loess area is researched in this paper.The datas of each Construction condition, including steel reinforced stress of the pile, steel supporting beam stress and environmental temperature are analyzed. And Soil physical and mechanical properties described in the Geological Investigation Report are analyzed too. Actual test datas are compared with the traditional soil pressure calculating results.Based on finite element analysis software "MIDAS/CIVIL2010", the construction process of excavation is simulated through establishing the finite element model,then the calculating results are compared with actual test datas. The results show that the soil pressure value of pile is less than a static earthpressre, close but different from active earth pressure, and also unlike the soil pressure value of sink.Many factors influencing the soil pressure, to facilitate the practical engineering application, in this paper, on the basis of traditional theory of soil pressure, and into the calculation model regression link. Get loess area and retaining piles pressure formula,and which is easy to calculate and promote.