Model device for measuring negative frictional resistance of pile foundation in under-consolidated soil, preparation method and test method

Abstract

The invention discloses a model device for measuring negative frictional resistance of a pile foundation in under-consolidated soil, which comprises a model box, a soil body is arranged in the model box, a lower load plate is arranged on the upper surface of the soil body, a loading system is arranged on the lower load plate, a model pile is arranged in the middle of the model box, the model pile is partially inserted into the soil body of the model box, a plurality of strain gauges are arranged on the portion, arranged in the soil body, of the model pile, the strain gauges are connected with a strain gauge outside the model box through wires, a plurality of pore water pressure gauges and a plurality of settlement marks are arranged in the soil body, the pore water pressure gauges are connected with a pore water pressure receiver, the settlement marks are connected with a dial indicator, and a plurality of drainage valves are arranged at the bottom of the inner side wall of the model box. According to the model device, basic test data such as pile foundation axial force, negative friction resistance and pore water pressure in under-consolidated soil in a coastal reclamation area and layered settlement of soil bodies with different depths are obtained through simulation, the bearing capacity of the pile foundation in the under-consolidated soil is obtained, and practical engineering is guided.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering and engineering structure test for pile foundation model experiments, in particular to a model device for measuring pile foundation negative friction resistance in under-consolidated soil, and also relates to a method for measuring pile foundation negative friction in under-consolidated soil The preparation method of the resistance model device also relates to a test method for measuring the negative friction resistance model device of pile foundation in under-consolidated soil. Background technique [0002] The tension and scarcity of land resources are the basic status quo of economic and social development in Zhejiang Province. In September 2012, the State Oceanic Administration officially issued the largest single reclamation project in China - Wenzhou Oufei Project. Within 30m of the subsoil layer in the tidal flat reclamation area, it is mainly under-consolidated silt and mu...

AI Technical Summary

Problems solved by technology

In the design of the pile foundation, the bearing capacity of the pile foundation is usually considered. However, due to the consolidation of the underconsolidated soil and other reasons, the soil around the pile side will produce a downward frictional resistance on the pile body that is consistent with the displacement of the pile, causing the pile The base load increases, the settlement increases, and in severe cases, it will affect the normal use of the building (structure) and even the structural safety.

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