A water immersion load test method for a strip foundation model

Abstract

The invention discloses a soaking load test method of a strip-shaped foundation model. The method comprises the steps of: (1) construction of the strip-shaped foundation model; (2) construction of a load platform; (3) load loading; (4) soaking of the strip-shaped foundation model; and (5) load unloading. The method is simple in steps, reasonable in design, convenient to realize and excellent in use effect; the strip-shaped foundation model is constructed in a constructed strip-shaped foundation research field; meanwhile, the installation of a monitoring element is finished to guarantee the foundation settlement standard, the ground surface settlement standard and accurate installation of a water moisture meter; and under load loading and soaking tests, the settlement of a strip-shaped foundation, the settlement of the ground surface and the volume water content of a collapsible soil layer can be accurately detected to provide reliable basis for construction of the strip-shaped foundation to be constructed.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering detection and testing, and in particular relates to a water immersion load test method of a strip foundation model. Background technique [0002] The strip foundation is a commonly used foundation form for multi-storey buildings. In areas where the collapsible soil layer is distributed, the collapsible soil layer will undergo collapsible settlement when it encounters water. The collapsible soil layer under the strip foundation is often used as a cushion Layer treatment to reduce foundation deformation and improve foundation bearing capacity. Cushion treatment is to excavate the collapsible soil of a certain width and thickness under the foundation of the building, lay the original soil excavated from the foundation pit or replace it with lime soil at the bottom of the foundation pit, backfill and compact it layer by layer. The design elevation serves as a cushion for the foundati...

AI Technical Summary

Problems solved by technology

First of all, in order to achieve a better simulation effect, the stiffness and size of the pressure-bearing plate are required to be close to the strip foundation of the building. The size of the strip foundation to be constructed is close to that of the building, and the size effect of the bearing plate will have a great influence on the settlement of the foundation; secondly, in the plate load test, the bearing plate is exposed on the ground, while the strip foundation of the building is buried In the filling, the depth of the strip foundation will affect the settlement of the strip foundation and the bearing capacity of the underlying soil, resulting in inaccurate results of the plate load test; thirdly, when carrying out the flooded plate load test, the existing method can only It can be immersed in water in a small area around the pressure plate (generally, the side length or diameter of the immersion test pit is 3 times the side length or diameter of the pressure plate), and small area immersion cannot accurately simulate the intermittent or continuous conditions of the actual construction site. The subsidence state of the strip foundation and the ground surface during flooding cannot simulate the change in the settlement of the strip foundation and the surface caused by the infiltration of surface water from the outside of the cushion to the inside of the cushion, and it is impossible to obtain the untreated lower part of the strip foundation during the flooding process. The change of volume moisture content of the collapsible soil layer

Images