Titlebook: Sealing of Boreholes and Underground Excavations in Rock; K. Fuenkajorn,J. J. K. Daemen Book 1996 Chapman & Hall 1996 Borehole.Tunnel.ceme

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Book 1996tivity to environmental concerns of the technical community as well as of the public at large has resulted in an increasing recognition of the fact that these geological penetrations may have an environmental impact. The issue of possible contamination resulting from migration along boreholes, adits

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Dynamic Loading Impact on Cement Borehole Seals,ffected thereby (as can be seen from the seismic hazard map shown in Figure 4.1), while sufficiently far not to experience major effects such as rock fall, slippage and/or breakage. The map in Figure 4.1 indicates the effective peak acceleration that might be expected to be exceeded during a 50 year period with a 10% probability.

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outset

Hydraulic Performance of Cement Borehole Seals,l boreholes. The methods used in the data interpretation and analysis given in Chapter 7 were applied at both sites. Test results and problems associated with the testing are discussed. Recommendations on the . hydraulic performance test of borehole seals are given in section 8.6.

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Laboratory Performance of Cement Borehole Seals,This chapter presents an experimental method to assess the performance of cement borehole seals (plugs) under laboratory conditions. One of the prime goals is to obtain experimental data regarding the effectiveness of sealing.

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Performance of Bentonite and Bentonite/Crushed Rock Borehole Seals,d longevity in nature (e.g. Meyer and Howard, 1983; Pusch, 1983). Bentonite is used extensively for sealing boreholes. Under certain circumstances advantages can be gained by sanding bentonite or by mixing bentonite with crushed rock.

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