Discrete material reinforcement composite foundation model pile, test device and test method

Abstract

The invention discloses a discrete material reinforcement composite foundation model pile, a test device and a test method, and belongs to the technical field of discrete material composite foundation simulation and test. The technical problem to be solved is to provide the discrete material reinforcement composite foundation model pile, the test device capable of testing stress and deformation along pile body height of the model pile, and a test method for parameter acquisition. According to the technical scheme adopted by the invention, the structure of the discrete material reinforcement composite foundation model pile is as follows: a packaging coiled material is formed by coiling a stepped thin plate, and the packaging coiled material is filled with a filling material; the test device comprises the model pile, a loading device, a leveling device, a force test device and a deformation test device; and the test method comprises the following steps: manufacturing the stepped thin plate into a cylindrical shape, filling a hollow part with the filling material to form the model pile; mounting a soil pressure box and a perimeter deformation measuring scale inside and outside the model pile; mounting a pressure sensor and a settlement surveying dial gauge on the top of the model pile; and carrying out vertical step loading.

Description

technical field [0001] The invention discloses a bulk material reinforced composite foundation model pile, a testing device and a testing method, and belongs to the technical field of bulk material composite foundation simulation and testing. Background technique [0002] In the foundation design of civil engineering, when the bearing capacity of the natural foundation cannot meet the design requirements, sometimes the composite foundation is used to improve the bearing capacity of the foundation and reduce settlement. According to the bond strength of the pile material, the composite foundation can be divided into bulk material reinforcement and bond strength reinforcement. The sandstone pile composite foundation is a commonly used foundation treatment method for the composite foundation of the powder material reinforcement. Sand and gravel pile composite foundation is a composite foundation in which crushed stone, sand or sand and gravel mixture are squeezed into the forme...

AI Technical Summary

Problems solved by technology

[0009] In formula (1), the area replacement rate (m) can be calculated and determined by the parameters of pile diameter and pile spacing, and the eigenvalue of soil bearing capacity between piles after processing (f sk ) can be determined by the plate load test, but the determination of the pile-soil stress ratio (n) of the composite foundation is more complicated, and the code stipulates that it should be determined according to the regional experience

When measuring accurately, it is necessary to pre-embed the soil pressure box in the test pile and the soil around the pile for testing. The test process is affected by many external factors, which has great uncertainty, and the vertical bearing capacity of the sand and gravel pile cannot be considered.

Images