Design And Analysis Of Independent Foundation Height Of Rock Foundation

In Guangxi Zhuang Autonomous Region,there are a lot of limestone peaks,commonly known as "karst terrain";due to the wide distribution of rocks,many underground excavation can see rock strata,so the construction of buildings in this area is mostly based on rock as the foundation bearing layer.Rock foundation often has great rigidity.The independent foundation and strip foundation on rock designed by the current "code for design of building foundation" often have the characteristics of small foundation area and large height.The large height of foundation section will often cause certain difficulties to the construction,because the rock is hard and needs to be broken,which will have a certain impact on the construction cycle and progress,and the cost is not small from the economic point of view.Taking the height of independent foundation on rock foundation as the research object,this paper analyzes and discusses the stress of independent foundation on different foundations by reading the literature and research theory of single foundation on rock foundation at home and abroad.It is found that the independent foundation on rock foundation is different from the foundation in general soil layer.The stiffness of rock foundation is different from that of non-rock foundation.In this paper,the height of independent foundation on rock foundation is taken as the research and analysis object.By reading the literature and research works of scholars at home and abroad about independent foundation on rock foundation and analyzing and discussing the stress of independent foundation on different foundations,it is found that the stress characteristics of independent foundation on soil foundation are reasonable and practical with reference to beams and plate structures.However,the stress characteristics of the independent foundation of rock foundation are different from the general bending and shear stress state of beams and slabs,and also from the general uniaxial compression state,but are in the composite stress state of compression,bending and shear.Therefore,the design of independent foundations on rocks should be different.It is also found that the independent foundation with stirrups can not only reduce the height of the independent foundation,but also control the spread of inclined cracks in the foundation.On the basis of previous scholars’ research theory,this paper introduces a new shear calculation method for the independent foundation on rock foundation,which provides a new idea and suggestion for the structural design of the independent foundation on rock foundation.It is also found that the independent foundation with stirrups can not only reduce the height of the independent foundation,but also control the spread of inclined cracks in the foundation.On the basis of previous scholars’ research theory,this paper introduces a new shear calculation method for the independent foundation on rock foundation,which provides a new idea and suggestion for the structural design of the independent foundation on rock foundation.In this paper,several practical projects in Guilin are compared.Through calculation and comparison,it is found that the upper load,rock quality grade,stirrup size and other factors have an impact on the shear resistance of single foundation.Structural design is to carry out reasonable qualitative and quantitative calculation and analysis of the structure,avoid unsafe factors of the structure,make the stress as reasonable as possible and obtain the best economic benefits.In this paper,a reasonable design method of single foundation height on rock foundation is proposed to make the design of independent foundation on rock more economical.