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Building Design and Construction Handbook - Merritt - Ventech!

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TABLE 6.21 Site Improvement Methods (Continued)<br />

Thermal<br />

6.113<br />

Method Technique Principles Suitable soils Remarks<br />

Heat<br />

Freezing<br />

Geosynthetics Geogrids, geotextiles,<br />

geonets, <strong>and</strong><br />

geomembranes<br />

Heat used to achieve<br />

irreversible strength gain <strong>and</strong><br />

reduced water susceptibility<br />

Moisture in soil frozen to hold<br />

particles together <strong>and</strong><br />

increase shear strength <strong>and</strong><br />

reduce permeability<br />

Use geosynthetic materials for<br />

filters, erosion control, water<br />

barriers, drains, or soil<br />

reinforcing (see Art. 6.11)<br />

Cohesive soils<br />

Source: M. P. Rollings <strong>and</strong> R. S. Rollings, ‘‘Geotechnical Materials in <strong>Construction</strong>,’’ McGraw-Hill Publishing<br />

Co., New York.<br />

All soils below the<br />

groundwater table;<br />

cohesive soils above<br />

the groundwater<br />

table<br />

Effective filters for all<br />

soils; reinforcement<br />

often used for soft<br />

soils<br />

High energy requirements; cost<br />

limits practicality<br />

Expensive; highly effective for<br />

excavations <strong>and</strong> tunneling;<br />

high groundwater flows<br />

troublesome; slow process<br />

Widely used to accomplish a<br />

variety of tasks; commonly<br />

used in conjunction with<br />

other methods (e.g., strip<br />

drain with surcharge or to<br />

build a construction platform<br />

for site access)

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