Numerical Analysis Of Incline-rectifying Technology For Building By Horizontal Drawing Out Soil

Uneven settlement of foundation will be effected by the type of superstructure and foundation,hydrological and external environment,and then cause the inclination of buildings,which is a serious engineering quality problems.The inclination of building will get bigger and bigger if no measures are taken,and even lead to the collapse of buildings.Common inclination correction method can be divided into three categories:forced settlement rectification method,upright rectification method and comprehensive method.In the process of design the scheme of rectification,the applicable conditions of each method should be considered synthetically in order to ensure the effectiveness of inclination rectification.According to a rectification and reinforcement project of residential building,the three dimensional model of the whole soil layer and upper structure using finite element software ABAQUS,the influence factors of building settlement on horizontal digging rectification process had been studied and the main research results are as follows:1.Trench work for incline-rectifying will lead to stress relief of the soil,different depth of trench will have different effect on the settlement of the building.The best excavation depth of trench had been studied for meet the needs of horizontal drawing out soil.2.In the process of horizontal drawing out soil,Three important factors affect the correcting effect:digging hole diameter and depth and horizontal spacing of digging soil;When digging hole diameter is small,plastic deformation region and between overlapping is very small,when the diameter increases,weakening the influence of plastic deformation to improve the settlement of action.Digging depth is small,the building body tilt structure is not obvious,when the digging depth increases,and will cause fewer side inclined large settlement;digging hole diameter and digging depth optimal aperture is found through finite element method,according to the settlement of construction determines the actual digging hole spacing.3.Double row digging hole method had been studied when the settlement of single row digging hole under the building does not meet the requirements of rectification.Square and equilateral triangle hole layout of digging soil and horizontal space of hole had been analyzed by numerical calculation.