| A big problem faced by the construction work and foundation engineering is to find a way to get rid of the bad influences the diffrential settlement has enforced on the superstructure , such as big deformation , crack and etc . It not only means a lot to the scientific theory , but also has has practical value in the construction field to explore the cause of subgrade diffrential settlement , the influence diffrential settlement caused to the superstructure and the method to eliminate the bad effects .1,It is summarized in this paper the harm caused by subgrade diffrential settlement to the construction structure, the present researching and controlling situation and progress concerning the diffrential settlement both in domestic and foreign countries .Analyzed key factors that have caused the ground differential settlement,These factors are the basis of the differential settlement regulatory measures and the method proposed.2,Considering the forming pattern of the structure rigidity, it is analised in the thesis the impact of subgrade diffrential settlement caused to superstructure.This thesis alsotakes a list cross four frame as an example,Applymg structure analysis software—SATWE,having studied the influence of endogenic force and distortion of the superstructure caused by ground differential settlement, through the analysis of two kind of models of different structure rigidities forming, it indicates the superstructure's endogenic force influence have the very big difference because of the structure different rigidity mode of formation,Specially the axis strength nearby subsidence has the big difference,the result of calculation of once forming of structural rigidity is bigger than it of hierarchically forming of rigidity; The impact of partial differential settlement is great to the nearby floor and the component around,To others,the influence is small.3,Different ways of subgrade diffrential settlement and their impact are also studied . This text take one multispan frame of four layers as the example,that studies the influence of endogenic force and distortion of the superstructure caused by ground foundation differential settlement, by analyzing the impact of these ways,it indicates that the difference of their influence result is great.By contrast it indicates that the influence of structure leaning to superstructrue is least,that of partial diffrential settlement is biggest,so partial diffrential settlement of structure must be avoided.4,It is alsoexplained in the paper some knowledge about theory of monitoring,and a scientific and technological mansionr is taken as an example,explaining this monitoring method to this project and the course and the result of monitor.Through the influence analysis of diffrential settlement to this project,it indicates that it basically accords with the preceding analysis result.5,The controlling method of subgrade diffrential settlement is studied. From several respects such as the building, structure and constructing etc,this thesis have put forward it about controlling method and measure to subgrade diffrential settlement,that are solution of pertinence.they have mainly function of preventing diffrential settlement.These methods and measures have offered some reference suggestions for structural design and construction in the future. |
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