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Surface properties 863064 Rock surface roughness and frictional strength Ree,.cs. M J Int J Rock Mech .Win Sci 122..V6. Dec 19,~5. P.129-442 .A method is presented ,.,,hich relates a parameter describing rock surface roughness to the frictional strength of discontinuities. The various statistics used to describe rock surface roughness are re,,ie~ved, together ~ith their interrelations. The implicit filtering" in~ohed in the sampling process and the associated ctfccts on the prediction of the friction angle are discussed..-\n attempt ~s made to ,,alidate a method for estimating friction angle from surf arc roughness characteristics alone for any gi,,en dimensionless normal pressure ratio. A ,:a!ibration cur,,e is constructed from published data and used to predict (notion angle for a totally independent data set. A :ccond test of the prediction procedure is made by estimating the tau-s~gma relations for surfaces using published shear strength and surface roughness profile data.

Phvsico-chemical properties 863065 Measurement of thermal conductivity of solids v, ith a transient linear heat source on the plane surface of a poorly conducting body Vacquier.V Earth Planet Sci Lett V74..\2 3. Juh 1985. P2-5-279 The adaptation of the hot v, ire method for the measurement of sohd rocks arose due to the need for a cheaper and quicker method than the stead.,, state methods such as the divided bar, Brief description of the investigation and theor~ are gi,.en. An empirical equation is proposed to correct errors arising from source. 863066 Tunnelling soils in South Auckland, Ne~ Zealand Goldsmith. P R: Smith. E H En.gng Geol I22..Vl. Sept 1985. PI-II The factors in~ol',ed in the formation of subsurface erosion tunnels are discussed and the results of an in,.estigat!on of natural subsurface erosion tunnelling in Pleistocene sediments in South Auckland are presented. Research indicated the erosion features had not pre'.iously been identified or ascribed significance in the lithologies of the site. ,

863067 . Modelling t~,o-dimensional heat and moisture transfer in unsaturated soils.including gravity effects Thomas. H R Int J .\urn 4hal ),lerh Geomech ~9. \6. \,n-Dec .rye'5. P5-3-5~ -k theoreucal mode', ;s presented to predict simultaneous tran,;cent coupled heat and nzo>;tarc trans(cr m part!.,, satureted soils. The form, ulat;on is ira terms of volumetric moi:,ture content. is tv.o dmlenstona!, includes gra,.t:ation.d flo,.,, end takes into account latent heat o i ~aporiz:tuon effects The numerical sokmon of the problem is accomplished b~ means o ( a finite element solution aigorithm. Predictions from the numerical model are m,ed to !n~estigatc the import-moo of gra~it'ationai t~.ov., for the case of a soft stratum subjected to c,.aporation [o:,scs at the surface The resultsachic~cd sho,a good qualitati'.e agreement ~ith expected beha,.iour..-\uth. 863068 Thermal conducti,,it', of marine sediments Lo',ell. M A Q J Engng GeM 113..V-I. 19dS. P43--44l The potential uses of sea floor fibre-optic communication cables ha',e prompted interest in the thermal properties o1 marine sediments, l.aboratory investigation of non-cohesive sediments has shown that thermal conducti,.it~ can be expressed in terms of volume and conducti,,it.', ',a!ues of the components Similar results are reported for cohesi',e sediments. Electrical formation factor is known to be related to porosity for most marine sediments. It is shov. n that the electrical and thermal parameters ma.,. in turn be related through tins common parameter. The possibility of continuous electrical profihng for mapping '.ariations in thcrmal cot'ductivit,, of surface sediments is discussed. 863069 Steady state response of elastic ground containing a heat source

Booker. J R: Carter. J P Proc 9th Au,stralasian Conference on the Mechanics of Structures and Materials, Sydno., 29-31 Aug 1984 P86-91. Puhl Sydney: School (!/ Civil and Afinin~, En,~ne. 19%t Closed form solutions hate been found for the steady state distributions of temperature, displacements and stress around a point source of heat in an homogeneous, isotropic elastic bah" space. The relations of calculated values to the physical properties of the half space are presented. A practical example is worked out to estimate the surface hea,.e and maximum horizontal tensile stress which would result from burial of a lO00W constant heat source in a granite-like material.

Permeability and capillarity See aLso: ,Y63273 863070 Describing and predicting the hydraulic properties of unsaturated soils Van Genuchten. M T: Nielsen. D R Ann Geophys I'3..\5. Sept-Oct 1985, P6/5-627 To accurately predict unsaturated hydraulic conducti,,ity (K) from measured soil water retention data using anal~ tical f u n c I tions, a reliable descriptive model of the retention curve and an accurate model for K are needed. Several empirical expressaons for the retention cur~e are reviewed. A fi~e parameter equation ~as adopted, which permits the deri,.at:on of a closed-form analytical expression for K ,ahen used v, ith the

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