~SA

83218~ LAMINATED CLAY MADE STABLE WITH STONE New Civ Engr, N512, i~ Oct 1982, P26

The M65 motcrwa~ is to cross a series of very unstable clay slopes. This section is to be stabilised using stone 'piles' which are expec- ted to increase the soll shesr strength.

832185 APPRAISAL OF THE INFLUENCE OF A CURV~ FAILURE ENVELOPE ON SLOPE STABILITY. TECHNICAL NOTE

Charles, J A Geotechnique, V32j E~, Dec 1982, P389-3~

It is conclmded that where a stability ar~lysis is carried out by appraximating the actual curved failure envelope to a Mobr-Coulcmb linear envelope, care is needed to ensure that the approximation is made far a range of normal stresses aPlropriate to the problem urger ana~-ais.

8S~186 NO~LOCAt VARYATIONAL MK%'HOD IN STABILITY ANALYSIS Brabhakar Narayan, C G; ~atkar, V P;

R ~ , T J Geotech ~ Div ASCE, Vl0@, NGTll, Nov

1982, P14h.3 -lb-59

A mathematical technique is developed few ana- lyzing the stability analysis in terms of effec- tive stresses. The stability eqmatioms arc obtaim~ based on limiting equilibrium condi- tions. The factor of safety defining the stable state of equilibrium is derived with respect to shear stremgth and follows CoulomB-Mohr fail- ure criterion. The analysis considers the in- fluence of effective Inter-slice fc~'cesj add makes no a priori asst~nption regarding the shape of the slip surface, interrel stress distribution cr on the point of application of horizontal effective thrust line. The analysis is treated as a minimization l~oblem in the calculus of variations. Using the critical slip surface, the minimum factor of safety is obtained.

832187 SAFETY FACTORS FOR ~2OBABILISTIC SLOI~E DESIGN D'Anirea, R A; Sar~rey, D A J Geotech Emgng Div ASCE, VI08, ~Tg, Sept

I~2, PIIOI-III8

Presents a probabilistic method for determining a slope geometry possessing a Im~eseleeted desired failure probability under given soil conditions, using partial factors of safety. Sow~ces af bias on strength estimation and analysis technique are described and treated stochastically. Several parameter sensitivity studies are pre- sented and lead to the conclusion tha~ 1)las on strer~ estimation, as well as variation in spatial average strength, influence design most sigrdficantly. 42 refs.

832188 STABILITY OF SLOPES BY METHOD OF CHARACTERISTICS. TECHNICAL NOTE

Siva Reddy, A; Venkatakrishna Rao, K N J GeOtech EI~mg Div ASCE, Vl08, N~Tg, Sept

1982, PI182-I186

The method of characteristics with some simpli- fying assum~ioms (shear strer~ varying with dep~./uj t h e soil mass treated as a series Qf is~ers) is used in the stability smalysis of a straight slope. Factors of s a f e t y of a given slope at different heights are derived.

832189 INFLUENCES ON THE PROBABILITY OF FAILURES OF SLOPES

Farsterj W; Weber, ~ Proc 10th International Conference on Soll

Mechanics and Foundation Engineering, Stockholm~ 15-19 June 1981 , Vl, P127-130. Publ Rotterdam: A. A. Balkema, 1981

Using Frohlich's method, a stochastic variable is presented to express the static stability of slopes in terms of failure probsbilities. The cohesion and the coefficient of friction are treated as random variables. The influence of correlation between these var~able~ b snd of dif- ferent density functions for the variables are investigated.

Hydraulic structures

832190 STABILITY OF TRENCHES UND~ }~S~TONITE SUSPENSION Bertero, M; Marcellino, P Proc 10th Internatio~l Conference cn Soll

Mechanics anl Founlation Engineering, Stockholm, 15-19 June 1981, V1, P~1-46. Publ Rotterdam: A. A. Balkema, 1981

The stilly of the behaviour of large trenches is of importance due to the increased tendency to replace caissons and gravity walls with rein- forced dial~hragm walls in harbour wc~ks, espec- ially in the case of deep sea beds. The stab- il~ty (~ large T cross-section excavations under bentonite suspension is examined by measuring concrete sbsorption during pouring. Measurements are correlsted to the specific weight of the mud, tidal level and excavation modalities.

832191 COLLAPSIBLE SOIL FOUNDATION OF CANALS IN CENTRAL BRAZIL

Wolle, C M; Benvenutoj C; Carva]_ho, P A S Proc 10th Internationsl Conference on Soll

Mechanics and. Foundation Engineering, Stockholm, 15-19 June 1981 , V1, P277-280. Publ Rotterdam: A. A. Balkema, 1981

The occurrence of collapsible soils in the foundations of large irrigation canals in Brazil initiated lab tests, field tests and ponding of an experimental stretch of the main canal. The canals had been designed to be built with esrthfill and concrete linings and therefare settlement would result in severe ~roblems. Settlement predictions were established which were larger than observed during porzling. The solution adopted to prevent settlement was the replacement of the superficial layer of the foundation with a compacted fill.

Earth retaining structures

832192 COMPRESSION RINGS SUPIK)RT DEEP CUT Lalwani, C L Civ Engng, N Y, V52, N12, Dec 1982, I~0-51

Compression rings 8r~ sheet piles were used to brace a large open excavation during con- struction of the Cuymhoga Valley Lift Station, Ohio, USA, in order to protect adjoining buildings.

832193 NEW START IN BRITAIN FOR REINFORCED EARTH Parklnson, J New Civ Engrj N512, 14 Oct 1982, P16-17