Abstract
In this paper, the bearing capacity of the foundation is analyzed by means of numerical model tests. By changing the natural foundation of the coal gangue carrier size and position parameters obtained by the analysis are the main factors that influence the height of the strengthening effect of the conclusion. In the loading height H1 is less than or equal to 6m, the height increments and the bearing capacity of the foundation is approximately linear relationship; by changing the physical and mechanical parameters of pile carrier, through the analysis of filler bulk density is the main factor affecting the reinforcement effect conclusion, capacity increment density and foundation approximate linear relationship. According to the research results of natural foundation, composite foundation in the existing research of heap load method, only consider the loading height and packing density of two variable factors get the surface load and pile foundation bearing capacity to enhance the approximate relation between the magnitudes. Secondly, the assumption of slip surface method is used to calculate the bearing capacity increment of natural foundation and composite foundation under the condition of load, and the results are compared with the numerical results. For the natural foundation of mining subsidence pile bearing capacity increment Δfa foundation load may be determined with reference to "design code of building foundation", considering the effect of mining, foundation soil physical parameters adopted to reduce the dynamic value of value increment Δfa calculation formula of bearing capacity of foundation pile load characteristics obtained after type loading height limit of H1=6m; according to the compound two-layer foundation bearing force theory, the basic expression increment ΔPa foundation surface under overload limit is derived, in the loading height limit of H1=6m, the mining influence, foundation soil physical parameters to reduce the dynamic value after mining.
