Fracture grouting, also known as compensation grouting, is a grouting technique that hydrofractures in situ soil, using neat fluid grout. A sleeve port pipe is grouted into a predrilled hole beneath a foundation. The grout is injected under pressure at strategic locations through the ports in the pipe. Once the hydrofracture pressure of the soil is exceeded, fractures open up in the soil and are immediately expanded by the subsequent influx of grout. The process results in controlled heave of the overlying soils and structures. The technique has been used to relevel structures or to protect structures from settlement while a tunnel machine passes below.
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