Experimental device and method for simulating the sinking process of static pressure steel pipe piles under confining pressure conditions

Abstract

The invention discloses a testing device for simulating the static pressure pile-sinking process of a steel pipe pile under the confining pressure condition and a method of the testing device, and relates to a rock mechanic pile foundation technology. According to the testing device, a lower cover plate, a pressure chamber and an upper cover plate are sequentially connected from bottom to top through screw caps and screws to form an external component, a base, a rock sample and a guide pipe are sequentially connected from bottom to top to form an internal component, and the internal component is nested to be a whole through a latex film; the bottom end of the steel pipe pile sequentially penetrates through the guide pipe and a PVC casing pipe to enable the steel pipe pile to be vertically arranged in a circular hole, and the bottom of the steel pipe pile makes contact with the rock sample. The method comprises the steps of sample preparation, sample putting, assembly, testing and recycling. By means of the testing device for simulating the static pressure pile-sinking process of the steel pipe pile under the confining pressure condition and the method of the testing device, the static pressure pile-sinking process of the steel pipe pile can be simulated, the confining pressing condition of the pile in an actual rock stratum is simulated by applying the water pressure effect in the pressure chamber to obtain a change rule of shaft force along with pile-sinking displacement, the standard is unified, and multiple industrial copies can be achieved.

Description

technical field [0001] The invention relates to rock mechanics pile foundation technology, in particular to a test device and method for simulating the process of sinking static pressure steel pipe piles under confining pressure conditions. Background technique [0002] Due to the high compressive strength, high tensile strength, uniform material, and good ductility of steel pipe piles, steel pipe piles have good rigidity, strong bending resistance, and strong shear resistance after being processed into steel pipes. The steel pipe pile can greatly exert its mechanical characteristics, improve the bearing capacity of a single pile, reduce the number of piles, and reduce the size of the foundation cap. For earthquake-resistant areas, areas with large wind loads or tall buildings, the selection of this pile type can also give full play to its strong ability to resist horizontal loads. Open-end steel pipe piles form a soil plug effect during the pile sinking process, which can ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming that the pile foundation model test under fixed confinement conditions cannot truly reflect the different stratum environments, and consider the influence of the soil plug in the pile on the dissipation of pore water around the pile and the penetration of the pile tip when the closed air cavity is formed. Provide a test device and method for simulating the pile sinking process of static pressure steel pipe piles under confining pressure conditions, which can truly simulate the pile sinking process and reflect the pile sinking law

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