Laboratory simulation of reinforced clay walls

Laboratory simulation of reinforced clay walls

16A cohesion of a material versus the volt,he of a rock slope. Finally the stability of rock slopes is calculated at different slope heights, slope a...

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16A

cohesion of a material versus the volt,he of a rock slope. Finally the stability of rock slopes is calculated at different slope heights, slope angles, and vibration levels°

Groundwater problems

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Influence of dynamic loads due to explosions or earthquakes

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Earth retaining structures 821138 LABORATORY SIMULATION OF REINFORCED CLAY WALLS Ingold, T S Geotechnique, V31, N3, Sept 1981, P399-412 Direct shear and pullout tests were carried out on reinforced clay samples to investigate the adhesion factor of various types of reinforcement. Polythene mesh proved to ~ the most efficlent method of reinforcement. Simulated wall tests were then carried out on un-reinforced kaolin clay, and on samples reinforced with plastic mesh. The walls were failed under application of a vertical surcharge and results compared with discrete and c~nposite theories. Reasonable agreement was found between observed performance and that modelled by total stress analysi s. 821139 CURRENT USA PRACTICE: SLURRY WALL SPECIFICATIONS Millet, R A; Perez, J Y J Geotech Engng Div ASCE, V107, NGTS, Aug

1981, p1041-1056 The critical design criteria and the resulting specifications for slurry trench diaphragm walls and cutoff walls (soil-bentonlte and cementbentonite) are discussed. The critical design criteria for diaphragm walls are: (1) structural strength and integrity, (2) permanence, and (3) permeability, and for cutoff walls are: (1) permeability, (2) deformability, and (3) permanence° Cutoff backfill properties are briefly dealt with.

82114o VIBRATIONs TRANSMITTED TO THE SOIL DURING THE SINKIh~3 OF SKEET PILING: THEORETICAL ELI94ENTS AND SOME PRACTICAL CONSEQUENCES (IN FRENCH) Corte, J F Bull Liaison Lab Ponts Chaussees, NIl3, MayJune 1981, P65-72 Based on a literature search and practical experience, discusses: the source mechanism of the vibrations, their propagation in the soil, criteria for the protection of buildings, settlement. Considers specifically foundations of hydraulic structures.

Base courses and pavements

See also: 821139

See also: 821128

Comminution of Rocks See also: 821076 821142 TROUND RAPID EXCAVATION AND TUNNELING SYST~N Dardick, D Proc 5 t h R a p i d E x c a v a t l o n a n d Tunneling Conference, San Franclsco, 3-7 May 1981, Vl, P659-873. Publ New York: AIME, 1981 Results from studies on the Rapid Excavation and Mining (REAM) project shewed that firing projectiles at hard rock to create fragmentation was a faster and cheaper method than conventional drilling and blasting. Tround Internatior~l Inc are developing an open chamber, automated gun system for this, firing a salvo of three projectiles in each sequence. The Tround Terra Drill, incorporating a smaller version of the tunnelling gun, firing projectiles before drilling, is also being developed.

Rock fracture under dynamic stresses See also: 821032 821143 FRAGMENTATION OF SOLIDS UNDER IMPULSIVE STRESS LOADING Grady, D E J Geophys Res, V86, NB2, i0 Feb 1981, PI047-I054 Analysis of fragmentation restricted to ldimensional bodies is rigorously applied to both brittle and ductile fracture. Concepts from survival statistics are introduced to treat the randomness of fracture initiation. Fragment distributions are determined and contrasted under differing loading conditions for both brittle and ductile fracture.

Drilling See also: 821148

821144 INFLUENCE OF ROCK ANIsOTROPY ON HOLE DEVIATION 821141 GE(YfEXTILE-REINFORCED UNPAVED ROAD DESIGN Giroud, J P; Noiray, L J Geotech Engng Div ASCE, V107, NGTg, Sept 1981, P1233-1254 A method is developed to enable an engineer to calculate the required thickness of aggregate layer, and type of geotextile suitable for certain traffic conditions. This is done by combining an empirical formula (obtained from full scale test results) giving aggregate layer thickness as a function of traffic and soil properties, with a theoretical analysis of the reduction in aggregate layer thickness resulting from geotextile use. Practical examples and comp~risons with full scale tests are presented.

IN ROTARY DRILLING - A REVIEW Brownj E T; Green, S J; Sinha, K P Int J Rock Mech Min Scl, V18, NS, Oct 1981 ,

F387-401 Discusses directional control in such applications as mineral exploration, site investigation and horizontal drilling for probing ahead of tunnels and for coal degasification. Hole direction is controlled by drill-string mechanics and rock bit interaction effects° Anisotropy in the mechanical properties of the rock can influence rockbit intexsetion a m cause bit deviation. A review of laboratory and field evidence and of the theories advanced to explain bit deviation effects in anisotropic rock shows that, although some