Heaving-Bedrock Hazards, Mitigation,
and Land-Use Policy:
Front Range Piedmont, Colorado

DAVID C. NOE
Colorado Geological Survey, 1313 Sherman Street, Room 715, Denver, CO 80203

FIGURE 5: SWELLING SOILS Block diagrarn showing a widely used, general model for expansive soils (modified Forn Noe and Dodson, 1995). The model assumes that horizontally bedded clay soil or bedrock has unilorm composition. Hydration and expansion, resulting in uniform, vertical uplift of the ground surface (vertical arrows), occur within the near-surface zone of moisture change where naturally dry soils are wetted. The soils or bedrock beneath this zone remain at constant moisture and are therefore unaffected by wetting.

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NOTE: This information is provided for general education only. For detailed information concerning reactive soils, you should always contact a geo-technical firm.



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