Table 2.

Drilling methods used during post-failure investigation

BoreholeMethods
S1Sonic coring + rotary coring
S1ASonic coring + rotary coring
S2Sonic coring + rotary coring
S3Rotary coring + Geobore ‘S’
S3/1Cable percussive + Geobore ‘S’
S3/2Symmetrix + Geobore ‘S’
S4Geobore ‘S’ through grouted area + geophysics
S5Geobore ‘S’
S6Geobore ‘S’ + geophysics
PG1Open hole + grouting
PG2Open hole + grouting