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Engineering geological problems in tectonic divisions
Short answer
Main engineering problems include floods and liquefaction in Terai; landslides and weak rock in Siwalik; landslides and shear zones in Lesser Himalaya; rockfall, avalanches and GLOFs in Higher Himalaya; karst and frost in Tethys; and crushed zones and earthquakes along thrusts.
Discuss the engineering geological problems (challenges) in the different tectonic subdivisions of the Nepal Himalaya.
| Zone | Main engineering geological problems |
|---|---|
| Terai | Floods, river shifting and bank cutting, high water table, soft soils with low bearing capacity, liquefaction, arsenic in groundwater, no rock for aggregate |
| Siwalik | Weak, poorly consolidated rocks, landslides and debris flows, gully erosion, swelling mudstone, slaking, flash floods, steep slopes |
| Lesser Himalaya | Landslides in weathered phyllite and schist, shear zones along thrusts, karst and cavities in limestone, tunnel squeezing, seepage |
| Higher Himalaya | Very high relief and steep valleys, rockfall, avalanches, glacial lake outburst floods, moraine slides, difficult access, cold and frost |
| Tethys Himalaya | Karst in limestone, frost and permafrost, rockfall, cold, remoteness |
| Boundary thrusts (MFT, MBT, MCT) | Crushed zone, weak ground, earthquakes, landslides, water inflow |
✓ Answer checked by Claude Opus 5.5 (high effort)
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