The Study On The Influence Of Embedding Conditions To The Bearing Behavior Of Single Column Footing Within Rock Foundation

The construction of mountain towns in western China involves a large number of rock foundations with high strength and good integrity.Compared with soil foundations,rock foundations have higher bearing capacity and greater rigidity.High-rise buildings are becoming more and more common in construction projects in these areas.In order to give full play to the advantages of the single column footing within rock foundation,the study of the bearing performance of the independent footing within rock foundation under a large load has important social significance and engineering value.In actual engineering,the independent foundation is always under a certain embedding condition.At present,there are few studies on the relationship between the embedding condition and the bearing performance of the single column footing within rock foundation.This paper analyzed and studied the mechanical properties of independent foundations under different embedding conditions by combining theoretical analysis,in-situ tests and numerical simulations.The main contents and achievements of this paper are as follows:(1)Designed and completed the in-situ prototype test of the independent foundation under the center pillar of the rock foundation with embedded conditions in the actual project,and obtained a large number of in-situ test data of multiple sets of multidirectional and multi-measurement points.After analyzing the test data,it is found that the independent foundation under the column is basically uniformly distributed under the rock-embedded condition,and stress concentration occurs at the bottom edge of the foundation.(2)When the rigidity of the foundation is constant and the foundation has different rigidities,the reaction force of the foundation will be relatively evenly distributed under the condition of small upper load,and certain stress concentration will appear at the edge;when the upper load is large,the base reaction force concentration will increase with the decrease of the foundation stiffness,and there will be a certain stress concentration effect at the edge due to the uncoordinated deformation at the edge of the foundation.(3)When the foundation is completely under the rock embedding conditions of the actual project,the resultant lateral tangential force provided by the rock mass to the foundation can reach 40% of the upper load.(4)When the actual height of the independent foundation is large,under the action of large load,the foundation will have multiple expansion areas along the diffusion angle of the force along the height direction.In this paper,the research results of the bearing performance of the single column footing within rock foundation have important reference significance both in academic research and engineering application.