Grouting and Ground Treatment: Proceedings of the Third International Conference, (ASCE)
Mining Grouting: a rational approach
W. F. Heinz
Mining grouting in South Africa has always been associated with deep mines. Certain techniques and equipment used are a result of the very high pressures resulting from the large depths of South African mines. Some of the techniques specifically developed within the South African mining environment are: 1. Precementation of deep shafts up to 2400m; 2. Cover grouting to develop of sink under or through rock formations in safety; 3. The successful impermeabilisation of rock masses with ‘thin,unstable’ cement grouts; The conveyance of cement-sand slurries over many kilometers. “Grouting is more an art than an engineering science.” This statement may be true but in essence it has always been an admission of our lack of understanding of the success of grouting. In recent years cement and chemical grouting have developed a new dynamism driven by a better understanding of the grouting process, by an improved understanding of the grouting process, by an improved understanding of the behavior of grouting materials, by the development of new grouting materials (micro fine cements) and techniques (jet grouting) and, of course, by many good new publications (books and articles) and research on the subject. Other factors such as environmental concerns and computers have also contributed to this new dynamism in the grouting field. Many of these developments have been initiated in the civil engineering field such as dam grouting, tunneling, etc.; grouting in underground mining conditions is conspicuously absent in research, development and literature. This paper presents the development over many years and the State-of-the-Art of South African mining routing and endeavors to present a more rational approach in grouting particularly for mining conditions, keeping in mind recent developments in grouting engineering and possible developments in future.
|article #1147; publication #62 (GRT-2003)|