Deformation prediction and anti floating analysis of a raft foundation

Binbin Xu,A Caggiano

doi:10.1051/e3sconf/202129303006

Abstract

This paper mainly studies the deformation and stress of the concrete plat under the uniform load considering the thickness of the compression layer of layered ground. Firstly, the load characteristics and the ground strategy are discussed in detail to clarify the boundary condition. Then the deformation of the ground in each layer is calculated by GEO-Cal program and the final settlement and uneven deformation is also predicted using consolidation theory. Ground stress and settlement is also calculated by FEM to verify the previous calculation.

Highlights

According to the general layout plan and borehole layout plan, the bottom plate of the reservoir is a large area concrete structure
The post construction load includes the concrete weight acting on the bottom, which can be divided into the above water part and the underwater part; the water weight when the reservoir is full of water and the soil weight on the reservoir
The additional stress acting on the foundation of the reservoir at the relative elevation of - 6.4m is 15.45kpa, which can be regarded as a large area uniform load

Summary

Project overview

According to the general layout plan and borehole layout plan, the bottom plate of the reservoir is a large area concrete structure. According to the geological survey report, the foundation compression layer within the scope of the reservoir is large and uneven in thickness, which is easy to produce uneven settlement[1-4]. If the elevation of concrete floor is taken as the analysis object, the load acting on the surface before and after construction is shown, and the specific explanation is as follows:. The post construction load includes the concrete weight acting on the bottom, which can be divided into the above water part and the underwater part (the groundwater level is taken as the relative elevation of 2.4m); the water weight when the reservoir is full of water and the soil weight on the reservoir. The additional stress acting on the foundation of the reservoir at the relative elevation of - 6.4m is 15.45kpa, which can be regarded as a large area uniform load. The thickness of soft soil mucky clay 2c and silty clay 2d in the hydraulic hall is the most uneven, while the thickness of soft soil mucky clay 2a, silty clay 2b and mucky clay 2c in the reservoir is the most uneven

Soil parameters

Settlement calculation

Calculation results and analysis

Findings

Conclusions