Pile foundation type Pascal effect test device in soft soil layer

Abstract

The invention discloses a pile foundation type Pascal effect test device in a soft soil layer. The test device comprises a sample barrel, a test soil sample, a lateral pressure detection unit, a vertical pressure detection unit, a pore water pressure detection unit, a model pile, a clamping arm, a hydraulic type static-dynamic loading mechanism and a displacement measurement mechanism; the lateralpressure detection unit, the vertical pressure detection unit and the pore water pressure detection unit are electrically connected with a collector; a crust layer is provided with a loading area anda damage area; the hydraulic static-dynamic loading mechanism is provided with a roof-contacting part vertically jacked on the loading area; the model pile is arranged in the sample barrel, the lateral pressure detection unit is arranged on the model pile, and the vertical pressure detection unit is arranged below the loading area. The test device disclosed by the invention has the features of simulating the pile foundation type Pascal effect in the soft soil layer and controlling multiple conditions to perform precise test, and the device is suitable for the technical field of the geotechnical engineering.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a Pascal-like effect test device for pile foundations in soft soil layers. Background technique [0002] The upper layer of natural soft soil is generally covered with a hard shell layer with relatively high strength, high stiffness and low permeability, which has a sealing effect and a stress diffusion effect; when the pile foundation excavation causes local damage to the hard shell layer, the hard shell layer After being deformed under load, the underlying soft soil will form an extraordinary pore water pressure, which is similar to the pressure of a closed liquid squeezed around after being loaded. The value is far beyond the theoretical value and the scope of influence is large. "Pascal-like effect", which can cause engineering accidents such as pile foundation deviation or even fracture; because the Pascal-like effect does not conform to the trad...

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Problems solved by technology

The field test consumes huge manpower, material resources and financial resources, the cycle is long, the repeatability is poor, a

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