高层建筑深基坑双排支护桩设计中的计算问题研究

Abstract工程硕士学位论文AbstractWith the continuous progress of the "13th Five-Year Plan"process,China has entered aperiod of rapid development,the pace of urbanization is growing faster and faster,with thegradual relaxation of national fertility policy,more and more population flock Cities,leadingto the city's housing pressure is also growing,forcing more buildings to the high-level orhigh-level development,more underground space has also been a reasonable use.With therise of high-rise buildings,the depth of the pit is gradually deepened,the support of the pitwill become more and more important.There are many kinds of deep foundation pit support,double support pile as a new type of deep foundation pit support form,it is in a single row ofpile support structure developed on the basis of different from the single row The advantagesof the pile.Based on the data and the development status and characteristics of the deep foundationpit engineering,this paper studies the form and the mechanism of the double-row pile supportstructure proposed by the predecessors,discusses the advantages and disadvantages of thecommonly used calculation method and its applicability,And further studies on the basis ofthe previous study on the calculation model of double support pile,and the change law ofhorizontal displacement and internal force is obtained.The main research contents are asfollows:(1)The calculation model of several classic double row piles and the calculation methodof earth pressure are put forward and evaluated.(2)Based on the previous calculation model,a local earth pressure analysis method isproposed.A new method is proposed by using the method of elastic foundation beam,finiteelement method and local earth pressure analysis.method.(3)The method of local earth pressure analysis is mainly aimed at the study of local soilsand some soils after pile.The angle between the assumed slip surface and the horizontal planeis obtained by the trial algorithm,and then the pile and pile Active soil pressure of local soil.(4)The finite element method mainly refers to the one-dimensional rod element method,which is the division and numbering of the double row pile,and the calculation of the unitstiffness is carried out by combining the elastic foundation beam theory.Through theconversion of the coordinate system,Calculate and then form the total.(5)Based on the theory of local earth pressure analysis,finite element method and elastic