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.

中文翻译：

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混凝土垫的加固效果可防止地下管道因埋入式管道损坏而倒塌

这项研究描述了混凝土垫层的地面加固效果，以便将混凝土垫层应用于明挖的地面沉降恢复。当使用埋管时，混凝土垫可以防止由于埋管损坏而引起的空腔和地下松弛区域的膨胀。进行了一项实验研究，以分析通过混凝土垫层的地基加固而引起的地下区域的应力分布特征。另外，进行了数值分析以估计混凝土垫层地下加固的范围。作为实验结果，地下混凝土垫层的最大应力降低率为28.5％至30.9％，这意味着混凝土垫层的增强效果取决于混凝土垫层的安装深度。有限元分析（FEA）结果表明，在不同的情况下，混凝土垫层的安装深度会有所不同，以确保根据荷载条件（点荷载和均匀荷载）确保混凝土垫层的加固效果。因此，混凝土垫层的加固深度应取决于表面的载荷类型。