Probabilistic study on failure of large dams. Technical note

65A of water mflows has been undertaken, using operataonal, geological and hydrologtcal data. Analysts indicates that major inflows are a consequence of dynamic strata deformattons, whtch reduce dlscontmumes within the overburden capable of transmtttmg water from overlying aqmferous formatmns into workings Operatmns tend to encounter excessive water inflows when (1) cover to the Permtan aquifer is less than 100m or major coal measure aquifers exist within about 45m of workings, (2) tenstle face stratus induced at the base of the Permmn exceed 6ram per m, (3) sandstone strata forms less than one thtrd of the overburden, lmplymg a lack of competence m the seam roof, (4) major strata 'weights" or 'breaks' occur, and (5) faults or other major dlscontmumes are present m the roof strata Auth

Influence o f dynamic loads due to explosions or earthquakes 842214 Dynamic behavior of a buried pipe in a seismic environment Datta, S K, Shah, A H, EI-Aktly, N J Appl Mech (Trans ASME, Set E) V49. NI, March 1982, P141-148 The ptpe is modelled as a thm cyhndrtcal shell of hnear, homogeneous, lsotroptc, elastm material embedded m a hnear, homogeneous, lsotroptc, elasttc medium of mfimte extent The response charactensttcs of the ptpe due to changes m the material properties of the medtum are studied It ts found that even at long wavelengths and low frequencms, the dynamic response ts slgmficantly altered by changes m the Polsson's ratm and the ndtglty modulus of the surrounding medmm The real resonant frequenctes of the pipe are also found to depend on these quantmes

Surface Structures 842215 Geotechnical issues in offshore engineering Hoeg, K Norw Geotech Inst PuM N!44, 1983, 26P A state-of-the-art report presented at the 3rd Internattonal Conference on "Behavtour of Offshore Structures" (BOSS 82), Cambridge, Mass, 2-5 August 1982. Topees conmdered are offshore rote mvesttgaUons, seafloor mstabdtty and p~pelme safety, gravtty structures, pde foundattons and platform anchorage, jack-up platforms, arctm offshore constructton, and eroston and scour

842216 Expansive shale damage, Theban Royal Tombs, Egypt Curets, G, Rutherford, J Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 V3. P71-74 Publ Rotterdam A A Balkema. 1981 The phystcal detenoratton of the royal tombs m the Valley of the Kmgs, Egypt, has been analysed The major causes of damage are flood-mduced rock expanston and jomt movements

842217 T h t ~ m e n s i o n a i dynamic interaction of ties Sarfeld, W, Savldls, S A; Schuppe, R, Kiappench, H Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 V3. P287-292 Publ Rotterdam A A Balkema, 1981 A model ts presented for the calculatmn of h~gh speed ratl vehmles m whmh the couphng o f the tins bedded on the surface of a homogeneous elasttc lsotropm half space ts taken mto account

842218 Swiss standard for vibrational damage to buildings Studer, J, Suesstrunk, A Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 V3. P307-312 Publ Rotterdam A A Balkema, 1981 The baste concepts of the new Swiss standard SN 640 312 "Effects of vlbraUons on structures' are discussed The standard is based upon the results of vtbratmn measurements earned out m Swttzerland since the early 1960s

D a m s and embankments See also 842234, 842301, 842323, 842337

842219 Inherent settlement of embankments, the influence of compactness, the degree of saturation, and the method of compaction (In French) Pmattl, D, Gestm, G Bull Liaison Lab Ponts Chaussees N127, Sept-Oct 1983, P67-72 The mfluence of the filhng condtttons on the long term settlements of embankments was esttmated using oedometer tests on sands, Ioams and calcareous clay for a range oftntttal condmons of motsture content and compaction. It was concluded that (I) the more plasttc the soft, the more slowly settlements occur, (2) settlements may occur for degrees of compactton of 100% of Normal Proctor Optimum, (3) the stgmficance of settlement mcreases wtth motsture content of the soil and (4) when the samples are stattcally compacted the observed settlements are less tmportant than when compacted wtth the Proctor rammer

842220 Embankment failure on clay near Rio de Janeiro Ramalho-Orttgao, J A, Werneck, M L G, Lacerda, W A J Geotech Engng Div ASCE V109, NGTII. Nov 1983, P1460-1479 The constructmn on an instrumented trial embankment on soft clay ts descrtbed Field measurements on pore-pressure and vertical and horizontal dtsplacements were earned out and the results are discussed. Foundation strength was evaluated through vane tests, unconsohdated undramed trmxtal tests and SHANSEP method Embankment fatlure occurred when its hetght was about 3m. Stabihty analysts was c a m e d out to evaluate methods of assessing soft foundatton strength Auth

842221 Probabilistic study on failure of large dams. Technical note Tavares, L V, Serafim, J L J Geoteck Engng Div ASCE VI09, NGTII, Nov 1983, P1483-1486 H~stoncal data about dam failures are used to relate their fatture rate wtth the decade of constructmn and age The results are used to esttmate the probabdtty of failure for a dam built dunng 1980/1990 1 in 367