ABSTRACT:

The ground replacement method reinforced by geonet is based on field experiences so that a theoretical consideration has been required to adapt for use with the geonet. In this study, we have considered the mechanical behavior of the geonet based on the cable theory. As a result, obtained equations express the deformation and the stress distribution of the geonet.

INTRODUCTION

Sand replacement on dredged and reclaimed marine clay has been used for some time. It is easy to construct the land on the soft clay, the replacement method dumping the sand into the reclaimed marine clay easily. However, this conventional replacement method has been gradually decreasing because of the unreliable sand shape. In recent years, budgetary cutback of public undertaking has occurred so that this method is new employed by using the geonet, which can restrict the replaced sand and achieved a sand shape (Yasuhara et al., 1982). Hereafter, we call it the Geonet Replacement Method (GRM). GRM is shown in Figure 1. Theoretical consideration of this method was based on the application of the expression of the sheet method on the soft clay ground (Yamanouchi et al., 1979). However, it seems that the mechanism of GRM is different from the sheet method on the soft clay ground. Therefore, a theoretical consideration has been required to adapt to the geonet. In this study, we have considered the mechanical behavior of the geonet on a basis of the cable theory and derived the differential equation from the equilibrium condition of the geonet on the soft clay ground.

COMPARISON OF THE CALCULATION AND OBSERVATION

Verifying the validity of both the geonet deformation and the tensile stress distribution that were obtained by the above theoretical considerations, we compared the calculation result and the observation data.

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