Experimental study on force deformation of plain concrete pile of cantilevered secant pile
In the secant pile containment structure,the piles are actually involved in the structural stress under the mutual occlusion and embedding of reinforced concrete pile and plain concrete pile.However,there is no definite theory on the force deformation characteristics and law of plain concrete piles,so they are only used as water stop piles in most of the engineering designs for safety reasons,which causes great waste of resources.In order to investigate the force characteristics of the elementary pile in the foundation pit project so as to give full play to the potential bearing capacity of the elementary pile,this test takes the underground garage support project of Nanchang Bayi Square as the research background and studies the soil pressure and pile bending moment on the side of the cantilevered secant pile during the excavation of the foundation pit through model tests.The test results show that:under the horizontal load,with the increase of soil depth,the bending moment of the plain concrete pile first increases and then decreases,and the bending moment reaches the maximum near the excavation surface of the foundation pit;the magnitude of soil pressure on the pile side is approximately linearly distributed,and with the increase of horizontal load,the deeper the soil depth,the more obvious the change of soil pressure.Based on the analysis and collation of test data,the quantitative relationship between bending moment of plain concrete pile and occlusion rate,number of piles and soil pressure on the pile side is given,and the reliability of the formula is verified by complete circular secant pile test.The experimental results can provide reference for the design of plain concrete pile body of secant pile in actual engineering.
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万方数据
