Abstract:

In the Kumamoto earthquake in 2016, the stone wall of Kumamoto Castle has reached 30% of the total, but the cause of the damage is not clear. Therefore, in this paper, the structure of each stone wall and the back ground were classified into three types of stone base, semi-stone base and non-stone base type, and the relationship between the shape and damage ratio was analyzed. As a result, it was revealed that the damage mechanism of Kumamoto Castle stone wall was the main cause of the collapse of the stone base type, and the shocking induced the collapse. Analysis of liquefaction damage using GIS in the liquefaction district of Kumamoto city by on-site survey and survey in the 2016 Kumamoto earthquake.

1 Introduction

The 2016 Kumamoto earthquake occurred in the whole area of Kumamoto prefecture with the M6.5 front shock and the M7.3 main shock. In Kumamoto Castle, 30% of the total stone walls caused extensive damage such as collapse and infestation, as shown in Photo 1 and Photo 2. However, the cause of the damage is not clear. Therefore, this paper analyzed the damage ratio by dividing the type of The castle stone wall into three types, stone base, semi-stone base and non-stone base type. As a result, we aim to clarify the mechanism of the cause of The castle stone wall's collapse.

2 The Castle Stone Wall's Repair And Damaged

In the Kumamoto earthquake in 2016, the damage of Kumamoto Castle caused by the foreshock occurred in 10 places that have been restored so far as shown in Figure 2 (a). In the main shock, as shown in Figure 2 (b), most of the parts that have been repaired have been damaged.

3 Placesage of the Castle Stone Wall Construction and Damaged Places

Figure 3 is a plan view of the age of building The castle stone wall and its damage location. The pink color (A to Z) is the position 3) where Kuwabara measured the section of 23 stone walls in 1984 before the earthquake. Green (FK 1 - 28) is the position 4) Fukuda measured the section of the stone wall in 28 places of Kumamoto castle before the earthquake. Furthermore, we created 9 blue cross sections (KC 1 ~ 9) according to the report of Kumamoto Castle Research Center. From the above, the total is 49 cross sections

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