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Grouting in soil or rock is by nature difficult to monitor and evaluate. Recent developmental efforts and demonstrations on construction projects have shown that acoustic emission monitoring shows promise in its use before and after grouting to indicate the effectiveness of the grout in stopping groundwater seepage, and during grout injection to detect hydraulic fracturing. The latter application has the potential for permitting the use of increased injection pressures, and hence productivity, while actually decreasing the risk of extensive hydraulic fracture during injection.
acoustic emission, cement grouting, chemical grouting, groundwater flow, hydraulic fracturing, rock grouting, soil grouting, stabilization
Research director, EarthTech Research Corporation, Baltimore, Md.
Professor of Civil Engineering, Drexel University, Phila., Pa.