Page 30 - Handbook GEOTEKNIK_Final_Neat

Typical JKR’s Termination Criteria for Borehole & Rock Field Testing

Termination Building Embankment Cut Area River Bridge Field Works Description/ Limitation Photos
Criteria Purpose
SPT N-value Five (5) times Three (3) times Three (3) times Three (3) times Seven (7)
SPT N-value = 50 SPT N-value = 30 SPT N-value = SPT N-value = times SPT N-
50 30 value = 50
4. Trial Pits  to obtain  for shallow
bulk sample depth up to
for soil approximately
Or* Or* Or* and Or* Or* classification 3.0m

Termination 45.0 30.0 At least 5m 30.0 50.0
Depth (m) from Formation
Level

Table 5: Typical JKR’s Termination Criteria for Borehole & Rock Notes:* Whichever comes first

Rock Type Min. Core Length
Igneous rocks (granite) & bore depth < 24m or Recovery ratio R/ 4.5m Figure 8: Bulk Sample for Trial Pit
r < 50%
Igneous rocks, bore depth > 24m 3.0m
Shale/schist/slate/sandstone 6.0m
Recovery ratio R/r < 50%
Shale/schist/slate/sandstone 3.0m
Recovery ratio R/r > 50%
Limestone R/r > 50% and no cavity 6.0m
Limestone R/r < 50% or with cavity 9m – 21m
Other rocks R/r > 50% 4.5m
Other rocks R/r < 50% 6.0m
Min. core size should be 52mm diameter (NMLC or HMLC or equivalent)

14 PUBLIC WORKS DEPARTMENT MALAYSIA GEOTECHNICAL ENGINEERING HANDBOOK 15