ANALYSIS ON PIPELINE DAMAGE AND ESTIMATION OF MANHOLE VARIATION AMOUNT IN SEISMIC CENTER OF 2016 KUMAMOTO

Abstract

 The three dimensional coordinate values before and after the earthquakes could be measured by the aerial-photogrammetry using the common pricking points before and after the earthquakes, by proposing the calculate method of the coordinate values of the pricking points before the earthquakes. The aerial-triangulations were conducted. As the result, the locational accuracy of the proposed pricking points before the earthquakes could be verified. The manhole variation amount was conducted at the control point vicinity that the variation amount was known, in order to verify the manhole variation amount by proposed method. As the result, it was confirmed that the conducted variation amount was almost the same as the variation amount of the control point. The relative displacement, initial slope and axis strain between the contiguous manholes could be calculated, by measuring the three dimensional coordinate values of manhole before and after the earthquakes continuously. These were classified into “Damage” of the NTT pipeline damage surveying and “No damage” of that, in order to analyze the relationship with pipeline damage.