Indoor testing apparatus and indoor testing method for simulating pile side post-grouting

Abstract

The invention relates to an indoor testing apparatus and indoor testing method for simulating pile side post-grouting. The indoor testing apparatus comprises an air compressor, a grout storage tank and an interface shearing device, wherein the bottom of an upper shearing box pushed into the interface shearing device is provided with a grouting hole; and the bottom of the grout storage tank is connected with the grouting hole in the upper shearing box through a grouting valve and a grout inlet pipe. Cement grout is injected into the contact surface of a test soil body and concrete at a designedgrouting position via the grout inlet pipe; and then the physical and chemical properties of a pile-soil interface after pile side post-grouting are observed and analyzed through direct shear testingand subsequent soil body excavation. Compared with the prior art, the indoor testing apparatus and indoor testing method provided by the invention can be used for simulation study of the influence ofpile side post-grouting at different positions of the body of an on-site pile on the bearing mechanism of the foundation pile, can comprehensively study the influence of grouting and unloading conditions on pile side post-grouting effect by controlling different grouting and unloading conditions, are beneficial for revealing the grouting mechanism of pile side post-grouting, and provide referenceand the like for the design, construction and the like of post-grouting in practical pile foundation projects.

Description

technical field [0001] The invention relates to the technical field of pile side post grouting engineering, in particular to an indoor test device and a test method for simulating pile side post grouting. Background technique [0002] In the past ten years, with the continuous emergence of super high-rise buildings, high-speed railways, long-span bridges and complex underground infrastructure projects, pile foundations, especially super long-diameter piles, have been widely used. However, due to the many and complex factors affecting the load-bearing characteristics of piles in the construction process, although scholars at home and abroad have conducted a lot of experimental and theoretical research on them, they have not yet had a unified understanding of the load-bearing mechanism. The current pile foundation design The parameter values ​​for the calculation of the bearing capacity of pile foundations in the code are still based on experience and lack theoretical support....

AI Technical Summary

Problems solved by technology

Post-grouting on the pile side has a certain scope for the reinforcement of the soil around the pile. However, the specification determines the mechanism and reinforcement range of post-grouting on the pile side mainly based on statistical and empirical methods, and a post-pile post-grouting diffusion height is generally given. It is unreasonable to consider factors such as grouting pressure, grouting volume and load conditions without considering the range and range

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