<p><p><strong>Reference(s):</strong></p><p><em>Millet and Engelhardt (1982)</em></p><p><strong>Method Summary</strong></p><p>The Grouting Matrix can be employed when utilizing Bulk Infill Grouting at a site characterized by karst topography and solution cavities. The matrix relies upon grout hole drilling information of where actual solution cavities were located based on zones of “fast-drilling” during the grout hole drilling process and grout take data to provide a uniform basis for the evaluation of the effectiveness of grouting and for assigning additional holes for drilling and grouting. Grout hole drilling information is based the following parameters: (1) the cumulative length of fast drilling zones encountered, (2) the amount of grout solids injected into each hole and (3) the sequence in which the hole was drilled and grouted. The information is then used via a site-specific chart to determine whether a grout hole took (1) as much grout as expected, (2) more grout that expected or (3) less grout than expected. If other than an expected amount of voids or grout take is encountered, a detailed evaluation is performed. The identification of anomalous grout holes and their locations allows for the selection of subsequent grout holes. It has been claimed that this method of QC reduces the amount of time required to perform an ongoing evaluation of a grouting program and optimizes the number of grout holes drilled and grouted such that unnecessary “proof” holes are avoided.</p><p><strong>Accuracy and Precision</strong></p><p>Relies upon information gathered from drilling and grouting operations to provide analysis.</p><p><strong>Adequacy of Coverage</strong></p><p>Every grout hole drilling is subjected to the Grouting Matrix analysis</p><p><strong>Implementation Requirements</strong></p><p>Requires very experienced personnel</p><p><strong>General Comments</strong></p><p>The Grouting Matrix method can be used to control the adequacy of grout penetration in the subsurface voids as well as the implementation of the grouting process.</p></p>