Abstract
The article presents the issue of correctly calculating the SSC of the foundation bases in the process of compensation grouting. It is shown that the numerical calculation should be performed in two versions: hydrostatic pressure and rear volume strain in a cluster of soil. Using the example of an object in Moscow, the use of the PLAXIS 3D design complex was shown to calculate additional precipitation of buildings during compensation grouting and the passage of a tunnel under it. A method is given for determining the required volume of suspension during compensation grouting using numerical methods for calculating the SSC.
Highlights
The development of modern cities creates the need to improve the transport accessibility of new areas
When calculating the compensation grouting in the PLAXIS software, the question arises of the correct setting of the injection parameters for calculating the SSC
For example, if it is necessary to calculate additional deformations when sinking a tunnel under a building, it is necessary to set the compensation grouting with hydrostatic pressure, and when determining the required volume of suspension, the volume strain of the cluster
Summary
The development of modern cities creates the need to improve the transport accessibility of new areas. In the construction of new tunnels in their area often there is additional displacement of buildings They are due to technological features: with the passage of the diameter of the excavation slightly exceed the final diameter of the tunnel, which causes movement of soil in the area of excavation. Such a process is sometimes called “ground overrun” and is taken into account. Foundation settlement can be more than the limit value given in SP 22.13330.2016 In such conditions, there is a need for additional measures to reduce additional environmental precipitation.
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