Experimental device for load transfer research of pile-supported embankment with gradual loss of soft soil bearing capacity

Abstract

The invention discloses a researching and testing device for load transfer of a piled embankment gradually losing the bearing capacity of soft soil. The researching and testing device comprises a model slot, wherein the model slot is divided into an upper part and a lower part; the lower model slot comprises detachable layered movable drawing doors; holes are formed in a baseplate of each movabledrawing door at equal intervals for placing piles; foundation soft soil is filled into the positions between the piles; the upper model slot is filled with embankment and expressway surface material;and measurement elements such as settlement plates, displacement meters and soil pressure meters are buried at equal intervals along the embankment during filling so as to analyze the load transfer and deformation law of the piled embankment in the process of losing the bearing capacity of the soft soil. The researching and testing device has a simple structure, is convenient to operate, can trulysimulate the process of losing the bearing capacity of the foundation soft soil due to underground water drop and other factors, relates the settlement of the soft soil to the stress state of the embankment under the action of a soil arch effect, can clarify the different stages of the soil arch shape evolution during the service period of the piled embankment under the long-term effect of the load, thereby effectively evaluating the long-term working performance of the piled embankment.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a pile-supported embankment load transfer research test device which gradually loses the bearing capacity of soft soil. Background technique [0002] Pile-supported reinforced embankments have become a commonly used foundation treatment method in the construction of high-speed railways, expressways and other transportation infrastructure. The load in the pile-supported reinforced embankment is first transferred to the piles through the soil arch effect, and the rest of the load is mainly borne by the reinforced cushion and the soft soil of the foundation. Under the short-term working condition of the pile-supported reinforced embankment, the soil between the piles in the foundation can bear a large vertical load; and under the long-term service condition, the soil loss caused by the decline of groundwater and the adjacent excavation of the foundation pit or tun...

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Problems solved by technology

[0003] In the existing pile-supported reinforced embankment model test device, the foundation soft soil is basically fixed in the model test device and cannot be removed, so it cannot simulate the process of soft soil gradually losing bearing capacity. The changes in the law of load transfer in the embankment, such as the development and evolution of the soil arch effect, and the research on the bearing effect of the reinforced cushion are more limited

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