The Analysis Of Loading Feature Of Embankment Pile-Plank Wall In Steep Slope Of High Speed Railway

Pile-plank wall is a new type of retaining structure developed on the basis of anti-slide pile, which fits for fill Embankment and excavated slope. As the flexibility of Anchorage length and Sectional area of the pile in design, Pile-plank wall structure does well in improving the stability of the slope and controlling the lateral deformation at the same time. High speed railway has strait requirements of embankment settlement control especially non-ballasted track, and how to control deformation of embankment by limiting displacements of side direction comes to be a important problem. Design of ordinary railway or highway pile-plank wall mainly focuses on requirements of the structural bearing capacity, and requests for displacement control is very low, so the post research also did not pay special attention to displacement of using. The existing research can hardly meet the requirements of pile-plank wall design based on displacement control. Based the monitoring test of shoulder type pile-plank wall on the high railway Gui Guang, did the following work:1) Combining the feature of pile-plank wall structure, placed instruments including inclinometer tube for monitoring displacement, reinforcement gauges and concrete strain gauges for monitoring moment, displacement gauge in front of anti-slide pile for strain monitoring, displacement gauge in front of Anti-slide pile for displacement monitoring, earth pressure cell behind Pile-plank wall,displacement gauges in vertical and horizontal direction of the embankment from bottom to top of the Pile-plank wall.2) By physical and mathematical meaning of the moment functions, speculated the position of the sliding surface of slope, combing the monitoring system consisting of reinforcement gauges and concrete strain gauges in pile body; got the pile’s shear and moment on the sliding surface by integrating function got from fitting earth pressure cell’ data; used the method of cantilever pile solution based on the theory of the elastic foundation to the computing pile’s Displacement、bending moment and resistance to judge the applicability of the theory, meanwhile got the proper stress levels in the pile-plank wall model test.3) By the integral relation between Pile-plank wall’s soil stress and moment, analysised the validity of pile-plank wall’s earth pressure monitoring data and the reinforced concrete strain gauge data; compared the earth pressure based on the traditional earth pressure calculating theory method and the nonlinear earth pressure calculating theory method by slicing entirety of soil into pieces; using the deformation monitored of the pile-plank wall, seeking a long-term relationship of earth pressure’change and the displacement, discussing the rationality of use earth pressure at rest when designing the retaining permanent structures.4) a model conformed to the condition of worksite was built in the finite element calculation software. By calculating the different settlement between the lateral deformation of the pile-plank wall and that doesn’t take into account of the lateral deformation, in order to obtain the embankment’s settlement due to the lateral deformation of Pile-plank wall.