Geo-acoustic surveillance of strata conditions and preventive plugging of strata during shaft sinking (In Russian)

68A surrounding strata. Determination of coal/rock interfaces on geophysical graphs is possible by an empirical-statistical treatment of logged data. This new method is easily applicable and suitable for computer evaluation. 852246 Suggested methods for surface monitoring of movements across discontinuities Dunnicliff, J (co-ordinator) lnt J Rock Mech Min Sci V21, NS, Oct 1984, P265-276 Four methods are considered as means of monitoring rock movements, to provide an understanding of the behaviour of a rock mass and to assess its stability: Methods are monitoring movement across discontinuities using glass plates; using pins and a tape; using a portable mechanical gauge; and using a remote reading electrical jointmeter. 852247 Location of the Stour buried tunnel-valley using geophysical techniques Barker, R D; Harker, D Q J Engng Geol V17, N2, 1984, P103-115 The Stour Valley between Sturmer and Sudbury is a striking drift-filled channel, termed a 'buried tunnel-valley' after the subglacial mode of its formation. The geophysical surveys conducted in this region have proved to be extremely useful in siting costly abstraction boreholes. A gravity survey proved a fast technique for locating the buried-valley. The resulting Bouguer anomaly map indicates that the density of the boulder clay filling the valley is higher than the underlying chalk. Interpretation of the Bouguer anomaly clearly indicates the subsurface position and calculations of the depth to the base of the valley fill have been attempted. Resistivity sounding surveys confirmed the gravity interpretation and provided more detailed and reliable information on drift lithology and thickness at sites of specific interest for potential abstraction boreholes. 852248 Subsurface geophysical methods used to define geometrical or structural characteristics On French) Price, D G Rev Fr Geotech N23, 1983, P25-29 A general summary of the thirty-four papers presented in session 2 which consider progress in the techniques of using geophysical methods in the assessment of material and mass quality and properties. 852249 Geo-acoustic surveillance of strata conditions and preventive plugging of strata during shaft sinking (In Russian) Tyutyunnik, P M Shakktnoe Stroit N2, Feb 1984, P20-24 Grout curtains were used during the sinking of shafts in complex, fissured, water-hearing ground. A method using low frequency acoustic waves was developed to survey the strata through the grout and to check the plugging of the grouting holes. The method provided a high level of online information on the fissuring present in the strata and on the quality of the grouting.

Presentation and interpretation of data See also: 852082

852250 Computer aided data aquisition and analysis for the consolidation test Cousins, B F Aust Geomech News N7, June 1984, P19-23 852251 In-seam seismic Love wave scattering modeled by the finite element method Asten, M W; Drake, L A; Edwards, S Geophys Prospect V32, N4, Aug 1984, P649-661 The dynamic two-dimensional finite element method allows the computation of reflection, transmission and mode-conversion coefficients of Love-type waves in coal seams. Published field data from two known faults and a dyke are compared with the modelling results, and support the belief that broad-band seam wave data are capable of characterising a seam discontinuity (throw, hade angle, dyke thickness) as well as locating it.