Abstract
This study described a ground reinforcement effect of a concrete mat, in order to apply a concrete mat for ground subsidence restoration of an open cut. A concrete mat can prevent the expansion of a cavity and relaxation area underground due to buried pipe damage when the buried pipe is in use. An experimental study was conducted to analyze the stress distribution characteristics of an underground area by ground reinforcement of a concrete mat. In addition, a numerical analysis was performed to estimate the range of underground reinforcement of a concrete mat. As an experiment results, the maximum stress reduction ratio of the concrete mat in the underground was 28.5% to 30.9%, which means the reinforcement effect of the concrete mat, according to the installation depth of the concrete mat. The finite element analysis (FEA) results showed that the installation depth of the concrete mat differed in various scenarios, in order to secure the reinforcement effect of the concrete mat according to the load conditions (point and uniform load). Therefore, the reinforced depth of a concrete mat should be determined by the load type on the surface.
Highlights
There have been several occurrences of ground subsidence in major cities in Korea
A two-dimensional finite element analysis (FEA) was performed using ABAQUS, which is useful for evaluating the soil–structure relationship and analyzing the stress reduction effect induced through the stress occurrence of the concrete mat for various load conditions
This study revealed that a lower stress reduction effect was observed in comparison to the experimental
Summary
There have been several occurrences of ground subsidence in major cities in Korea. Kuwano, et al [17] analyzed the effect of the underground water level such that it generates cavities, and this was achieved by performing a laboratory model test From these results, it is known that a relaxation zone occurs in the area around underground cavities. The reinforcement effect was evaluated by using a concrete mat that was developed to prevent ground subsidence by suppressing the expansion of the relaxation zone and cavity, which may occur while buried pipes are in service This was performed when an open cut method was applied to the ground subsidence that had occurred in the area with buried pipes. The results were analyzed to examine the stress reduction in the ground
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