SEGJ Technical Conference

The inside cavity exploration in the embankment using microtremor array survey before and after injection of cement milks into the embankment

Abstract Inside cavities in railway embankments occur adjacent to abutments due to difficulty of compaction and infiltration. But it is difficult to explore these cavities. So, a model embankment was made adjacent to an abutment for the purpose to try several kinds of exploration methods. Microtremor array survey identified most of the inside cavities. Then, this method was tried on the railway embankment adjacent to an abutment. and, several inside cavities were detected. After injection of cement milk into this embankment, microtremor array survey was explored this embankments again. The phase velocity of this embankment generally increased. In this area, cement milks were confirmed in boreholes. So the microtremor array survey can fairly detect explore inside cavities in the embankment.