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The Characteristic Analysis of Internal Force and Deformation in Construction Dynamic of Alien Deep Foundation Pit

Author: ZhouFeng
Tutor: FengZhiZuo；SongZhanPing
School: Xi'an University of Architecture and Technology
Course: Geotechnical Engineering
Keywords: Foundation excavation monitor Supporting structure internal force Support force Deformation
CLC: TU753
Type: Master's thesis
Year: 2011
Downloads: 40
Quote: 1
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Abstract


With the development of our national economy and the acceleration of urbanization, underground space development and utilization become the characteristic of the research problem in engineering. The scale and the depth of foundation pit are more and more big, the geological conditions and circumjacent environment are more complicated, it puts forward higher request for design and construction of foundation pit.This text is aimed to analysis stress and deformation properties of deep foundation pit and supporting structure for Changchun railway station north square.This paper mainly through monitoring the different position force and deformation for protecting piles and interior support , it can obtain the properties of force and deformation in different working condition . Through analysising the monitoring result getting the following conclusion : the actual three–bit approximately equal to 50%～85% of theoretical value. The force of alien position growth 5%than standard section. The support force less than design value(50%～70%).With the foundation pit excavation , setting lower support and imposing prestressed , the upper support force reduction the small dereases. It is smilar with result of Equivalent beam method. The soil pressure is inverseed calculation by supporting system internal force measured. It exists gap with the result by Rankine’s earth pressure theory. The factors soil condition、supporting system stiffness、interior support presstressed reflect result .Along with the increase of excavation depth , horizontal deformation gradually increase of supporting system and foundation pit . Deformation is more apparent when there is prominent position in excavation section.The position of pile deformation maximum happens near excavated plane in each condition;Due to deformate of palisade structure and fall of ground water levels,causing the subsidence of surface.The position of settlement maximum is nine meters away from pit .Influenced range of surface subsidence reach 1.2 times foundation pit depth. The above results has reference value to similar projects.

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CLC: > Industrial Technology > Building Science > Construction > The project and the type of work > Foundation engineering
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