Study On Bearing Capacity And Safety Zoning Method Of Ground Foundation Adjacent To Slope Considering Slope Stability

The ground foundation adjacent to slope has been widely used as the foundation or subgrade type of engineering structure,which must ensure sufficient bearing capacity and stability.In this paper,the ground foundation adjacent to slope is taken as the research object,and the numerical simulation test is used to reveal the failure mode of the ground strip foundation adjacent to slope,and the mathematical expression model of the failure mode is constructed.Based on the mathematical characterization of the sliding mode,the force balance equation of the sliding block is established using the limit equilibrium method,and an estimation formula for the ultimate bearing capacity of the foundation adjacent to the slope is proposed considering multiple factors such as slope shape,foundation,and load.Combined with the engineering case,compared with the existing theoretical analysis method and numerical analysis method,the correctness and applicability of the formula are verified.Based on the formula,the influence of the characteristic parameters of ground foundation adjacent to slope on the bearing and stability performance of slope is analyzed,and the evaluation method of safety risk zoning of ground foundation adjacent to slope is constructed.It has important theoretical significance and engineering application value for the scientific and reasonable evaluation of bearing safety of ground foundation adjacent to slope.As the loading progresses,the velocity and contact force of the particles inside the slope gradually decrease,and the displacement and the number of cracks gradually increase.The results show that : In the process of progressive failure of ground foundation adjacent to slope,the compaction,shear and failure similar to that of flat foundation appears near the foundation.The decrease of slope angle and distance from foundation foot to slope top,and the increase of slope height,making the slope change from slope bearing failure to slope instability failure,and the instability failure mode of slope is mainly controlled by slope angle and slope height.Using the limit equilibrium method and the normal force transfer between the sliders,the estimation formula of the bearing capacity of the ground foundation adjacent to slope including the stability coefficient and the slope characteristic parameters and the estimation formula of the stability coefficient under different slope shapes,foundation materials and external loads are established.The results shows that : With an increase in slope angle,foundation width and stability coefficient,as well as the decrease in distance from foudation foot to slope top,cohesion and internal friction angle can reduce the bearing capacity of ground foundation adjacent to slope.It is found that the influence degree of different parameters on the bearing performance of ground foundation near slope is as follows: slope angle >distance from foundation foot to slope top > internal friction angle ≈ foundation width >cohesion.With an increase in the slope angle,foundation width and external load of foundation,as well as the decrease in distance from foudation foot to slope top,cohesion and internal friction angle can reduce the overall stability coefficient of slope.It is found that the first failure of the foundation near the slope is the slider III and slider II near the foundation,and the last is slider I.Based on the slope stability coefficient valuation formula,the idea of slope safety risk zoning is introduced,and the spatial security zoning method of different slope characteristic variables was established,and the generalized map of spatial security zoning of slope foundation was provided.It was found that when the slope foundation characteristic parameters are greater than or less than a critical value,the ground foundation adjacent to slope will have a greater risk of instability.