245A

846358 Geomembrane products Giroud, J P; Frobel, R K lnt Water Power Dam Constr V36, N3. March 1984, P23-26

Discusses the composition, production, classification and iden- tification of geomembranes.

846359 Geomembraues and geotextiles. Engineers strive for common standards lngold, T S New Civ Engr N594, 14 June 1984, P18-20

A review of the state-of-the-art for the use of geomembranes and geotextiles. Polymer technology has been extensively used in the manufacture of these fabrics.

846365 Evaluation of roof trusses, phase 2. Use of frequency of vibra- tion to determine chord tension Mangelsdorf, C P US Bureau of Mines report OFR 35-84. Jan 1983.58P

This report deals with efforts to develop a portable device suitable for underground use for the purpose of measuring the frequency of vibration of the horizontal chords of Birmingham roof trusses. Four devices were investigated and evaluated. An approximate empirical expression developed from a mathe- matical analysis provides a means of converting the frequency into tension. The method appears to be effective in mines with shale roof but requires some modification for other roofs. Auth.

Avail: NTIS, Springfield, Va, 22161 USA (PB 84-166479)

846360 Ground improvement for tunnelling Neve, J W Tunn Tuunlg V16, N6. June 1984, P51-52

Report on a British Tunnelling Society meeting where Mr Graham Biggart gave a lecture on methods of ground treat- ment. The main methods of ground improvement used in tun- nelling are grouting, low pressure compressed air and, to a lesser extent, groundwater lowering and freezing.

Bolts and anchors

846361 Simple rock bolt pull-out test device for teaching purposes. Technical note Stimpson, B lnt J Rock Mech Min Sci V21. N4, Aug 1984, P217-218

846362 Development of resin-anchored roof bolting technology based on an expanding polyurethane system (In German) Strobelt, S Neue Bergbuntech VI3, NIl , Nor 1983, P619-621

846363 Some studies on anchor plates in sand Hoshiya. M: Mandal, J N Soils Found V24, NI, March 1984, P9-16

Laboratory model tests to examine the pullout resistance of shallow vertical rectangular and square model anchor plates in loose granular soil have been carried out. The effects of force coefficient, breakout factor, embedment ratio and the width-to- height ratios of the anchor plates were examined.

846364 Ultrasonic stress transfer: a direct test of rock bolt integrity Moulder, G R" Howard, P L; Hesler, J C; Tarpley, W B US Bureau of Mines report OFR 31-84, Aug 1983, 84P

A device was developed that measures dynamic stress (ul- trasonic energy) transfer through installed rock bolts, a measure that is directly proportional to the degree of grout bonding of the bolt to the mine roofstructure and thus the ability ofthe bolt to bear static stress. The rock bolt bond tester (RBBT) is a hand- held portable device that shows three ranges of bolt bond condition: one-third (bad bond), two-thirds (marginal), or fully bonded.

Avail: NTIS, Springfield, Va, 22161 USA (PB 84-165802)

G r o u t i n g

See also." 846225

846366 Gelation of chemical grouts while in motion. Technical note Daniele, P; Hutchinson, J; Karol, R H; Ospitia, L; Reim, B Geotech Test 1 V7, N2, June 1984, P107-109

A test procedure to determine if a chemical grout will gel while in motion through a soil mass. An experiment is detailed, using sodium silicate grout catalyzed with glyoxal, to demonstrate the use of the test method and the extrapolation of laboratory scale to field scale parameters.

846367 Recent applications of grouting Merrifield, C M Ground Engng VI7. N5, July 1984, P7-10

A report of an informal discussion of the British Geotechnical Society held on 11 January 1984.

846368 Basic consolidation parameters for roadways in waterlogged ground (In Russian) Kipko, E Y Shakhtnoe Stroit Nl l, Not' 1983, P16-18

The injection of grout to produce a consolidated area around a roadway is examined.

Groundwater control

846369 Laboratory test results on self-hardening grouts for flexible cutoffs Chapuis. R P; Pare, J J; Loiselle, A A Can Geotech J V21. NI, Feb 1984, P185-191

The addition of cement to a bentonite slurry gives a complex material called a self-hardening grout which sets to become a clay-like solid. Its properties are highly dependent on the ben- tonite and cement used. This paper describes the characteristics of different mixes tested in their fluid and solid states which have been examined for their applicability for cutoffwalls in dams of the James Bay Hydroelectric Project, Canada.

846370 Prefabricated fin drains and their application lngold, T S Civ Engng, London March 1984, P35-39