Experimental Study On The Stress Characteristics Of H-type Anti-slide Pile

The h-type anti-slide pile is a new type of anti-slide combined supporting structure evolved from the leaning pile wall.Due to its advantages of high rigidity,convenient construction,good stability,good supporting effect and material saving,It is widely favored by researchers and engineering designers,but because its theoretical research seriously lags behind engineering practice,it has not been clearly stated in the relevant codes and manuals so far,which seriously restricts the development and popularization of h-type anti-slide piles.It is necessary to carry out research on it.In this paper,the typical landslide in the loess area is selected as a prototype,combined with finite element numerical simulation and indoor model test,based on the analysis and comparison with the model test of double-row anti-slide piles in parallel,under the action of landslide thrust,the h-type anti-slide pile is affected from the beginning.The force and deformation failure mechanism of the pile body during the whole process until the pile body is destroyed.The main research contents of this article are as follows:(1)The thrust of the landslide behind the pile of h-type anti-slide pile increases with the increase of load,and it is roughly distributed in a triangle shape,and the earth pressure near the slide surface is the largest.(2)Through the analysis and comparison of the front and rear row pile landslide thrust and soil resistance,the ratio of the rear row pile and the front row pile to the landslide thrust is about 1.15: 1.(3)The deformation of the front and rear rows of piles is roughly the same as the shape of the bending moment diagram,and they are all distributed in an "S" shape.The position of the reverse bending point is near the sliding surface,and the maximum bending moment of the rear row of piles is greater than that of the front row of piles.(4)From the analysis of the deformation and bending moment diagram of the pile body,it can be seen that the failure of the pile body is the failure mode of the double plastic hinge.The positions of the two hinges are located above the sliding surface in front of the pile and below the sliding surface of the pile respectively.Basically close.(5)Under the same test conditions,h-type anti-slide piles can withstand greater landslidethrust than parallel-arranged double-row anti-slide piles,and the front and back row piles have a more reasonable and economical form.