Roadbed types

Karst structure

distance (m)

Main damage forms

Half cut and half fill

Stone bud, soluble ridge

70

Roadbed instability

Karstens, karst valleys

420

Uneven settlement

Miarolitic, solution crack

150

Roadbed instability

Cutting

Concealed hole gap

80

Slope instability

Low mountain slopes

380

Slope instability

Low mountain slopes

40

Slope instability

Stone buds and caves

60

Slope instability

Embankment

Stone shoots, karst caves, water holes

800

Embankment unstability and uneven settlement

Stone bud and sink

760

Embankment unstability and uneven settlement

Water-eroded groove, solution crack

700

Karst collapse, uneven settlement

Stone bud, solution crack

120

Uneven settlement

Stone bud, depression, valley bottom

870

Uneven settlement

Slope, depression

690

Uneven Settlement

Valley bottom

800

Embankment unstability and uneven settlement

Valley bottom, karst spring

320

Embankment unstability

Slope, gully

200

Uneven settlement