Abstract:

Old-time stone walls are important cultural assets in Japan. There are many cases of large deformation or collapse of stone walls caused by earthquakes in the past. In order to maintain the seismic stability of stone wall, good repair of large deformed wall is an essential project. In the repair, it is a big issue whether the reinforcement of wall is employed or not. If reinforcement is not applied, a risk remains that the stone wall deforms largely again when encountering a big earthquake. If reinforcement is applied, it is required how to enhance the seismic resistance by the reinforcement. To examine these issues, we carry out a numerical analysis of stone wall by the discontinuous deformation analysis (DDA). In the analysis, a large deformed stone wall is reproduced, and the material parameters for analysis are determined. Based on the results, the seismic stability of the stone wall is examined for the case of employing reinforcement by soil improvement.

1 Introduction

In Japan, there are many classical stone walls that experienced hundreds of years after construction. In order to maintain and manage these traditional structures in the future, it is important to properly evaluate the stability of structure. Furthermore, in Japan where earthquakes occur frequently, there are many stone walls that cause large deformation and lead to collapse due to earthquake. In order to maintain the long-term stability of traditional structures, a method to accurately evaluate the stability on earthquake is required.

In recent years, many studies on the method for evaluating the stability of stone wall have been carried out. As the example of past research, an exit index which is an empirical index (Nishida, 1998), a method based on earth pressure theory (Ichioka, 1996) and a numerical analysis (Noma, 2013), have been reported. However, at the present stage it is difficult to establish a method for quantitatively evaluating the stability of stone wall based on the deformation of wall during earthquake which considers the waveform of seismic motion.

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