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Distributary-mouth bar development and role of submarine landslides in delta growth, South Pass, Mississippi Delta
159A Some piles in the Garoupa platform were instrumented to verify their bearing capacity in the underlying calcareous soils. Initial blow counts were lower than expected and some piles were redriven after a period of about two months. Information was gained about the soil conditions, pile capacity predictions, the use of dynamic pile testing techniques and the analysis of data therefrom. 855182 Analysis of offshore pile driving - a review GoNe, G G Proc Conference on Geotechnical Practice in Offshore Engineering, Austin, Texas, 27-29 April 1983 P596-603. Publ New York: ASCE, 1983 Computer analysis of dynamic measurements made during offshore pile 'driving to investigate driving system performance, soil performance and driveability is briefly reviewed. 855183 Geotechnical considerations of Las Vegas valley Gibor, J M In: Geological Environment and Soil Properties (paper prepared in conjunction with the ,4 SCE Geotechnical Engineering, Division and the A S C E Convention, Houston, Texas, I7-21 Oct 1983) P351-373. Publ New York: ASCE, 1983 The geology and geologic hazards, including compaction faults, fissuring and subsidence due to groundwater removal, are described for the Las Vegas valley, Nevada, USA. Soil conditions and accompanying foundation problems in collapsible soils, expansive clays, gypsiferous areas and caliche are detailed. A majority of foundation problems arise in expansive soils and the particular cases of chemical heave and swelling clays are considered. 855184 Slope erosion related to soil freezing and thawing on Mt Fuji Fukue, M: Anma, S; Okusa, S In: Geological Environment and Soil Properties (paper prepared in conjunction with the ,4SCE Geotechnical Engineering Division and the ,4SCE Convention, Houston, Texas, 17-21 Oct 1983) P405-432. Publ New York: ASCE, 1983 The existence of a low permeability frozen soil layer beneath clastic materials on the slopes of Mount Fuji, Japan, makes the slopes susceptible to erosion by water seepage or water flow. Slope erosion is at a maximum in spring and summer, when this frozen layer is present. The lack of permeability is taken to be the consequence of ice blocking drainage channels.
Slopes See also." 855073 855185 Slope instability Brunsden, D (editor): Prior, D B (editor) Chichester. John Wiley. 1984. 620P Recent work in the field of slope instability is examined. Landslide classification, field assessment, monitoring, materials testing and stability analysis are discussed. Development in the study of mass movement phenomena, in particular rock mass failures, sensitive soils, slides, flows and submarine failures are given special attention.
855186 Distributary-mouth bar development and role of submarine landslides in delta growth, South Pass, Mississippi l)ella Lindsay, J F; Prior, D B; Coleman, J M Bull Am Soc Petrol Geol [/68, N i l , Nor 1984. P1732- 1743 Studies on the development of a marine bar in the Mis~i~i!'; ~; delta indicate that sediment is moved into deeper water 1-;vthe action of undersea landslides. Failure of the bar occurs after ! ~years, in response to climatic events or, possibly, pore p r e s ~ w build-up due to biogenic activity, which changes the shc~: strength of the deposit or alters the local bottom slope. Build-t:i-~ and movement of the sediment has been modelled by comptatcr analysis. 855187 Development and runout of a detachment slide, Bracebriage Inlet, Bathurst Island, Northwest Territories, Canada Mathewson, C C; Mayer-Cole, T A Bull Assoc Engng GeM V21, N4. Nor 1984. P407-424 A detachment slide on a vegetated south facing slope of apprc~ximately 5 deg was investigated and it was concluded tim / iI developed due to a unique set of conditions: (1) wind dri\er~ snow was trapped along the lee of the valley ridge; (2) sum~vJ,=r melting provided water to the head of the slope: and (3) n~ei' water accelerated permafrost melting and developed excess pore pressures. The slide then continued as: ( 1) downhill creep aI the head of the slope increased stress on the vegetative mat until the tundra failed; (2) the slide overloaded the slope below, leading to a series of progressive detachments; until (3) as the strength of the slope materials increased with decreasing water content, the slide was halted. 855188 Hydrogeologic control and statistical prediction of active ~n~.ss movement Watson, I Bull Assoc Engng GeM V21, N4, Nor 1984. P479-494 Extensive research study has been carried out on landslide intensity for slopes with permeable materials overlying cohesixe soils. A steady supply of water to the slope initiates and reactivates mass movement, mainly by sustaining high pore pre~sm"e in the slope-forming materials. Hydrogeologic variables are considered in relation to other factors affecting mass movemerit. Collection of data from aerial photographs anE computer-assisted data handling have given results consis~ert with geotechnical theory and field data. The method described offers an approach for examining similar problems. 855189 Centrifugal model study of slope instability in Ottawa area Champlain Sea clay Goodings, D J; Schofield, A N Can Geotech J V22, N1, Feb 1985. P102-]09 Eight intact samples of quick Champlain Sea clay, formed v-~ 19 slope configurations, were tested on a 150g geotechnieal c:~trifuge. 14 samples showed some instability, from deep i~v:,c~ soil movement, to slope degradation, to flow sliding. },~o&~! behaviour suggests time-dependent horizontal stress relief ~,~a: precede failure, that failure is not circular and rotational. ~v.4 that uplift may affect subsequent retrogressions in protot~7~= landslides but not initial failure. The inconsistencies betweer model testing and real behaviour were discussed.
Slopes See also." 855073 855185 Slope instability Brunsden, D (editor): Prior, D B (editor) Chichester. John Wiley. 1984. 620P Recent work in the field of slope instability is examined. Landslide classification, field assessment, monitoring, materials testing and stability analysis are discussed. Development in the study of mass movement phenomena, in particular rock mass failures, sensitive soils, slides, flows and submarine failures are given special attention.
855186 Distributary-mouth bar development and role of submarine landslides in delta growth, South Pass, Mississippi l)ella Lindsay, J F; Prior, D B; Coleman, J M Bull Am Soc Petrol Geol [/68, N i l , Nor 1984. P1732- 1743 Studies on the development of a marine bar in the Mis~i~i!'; ~; delta indicate that sediment is moved into deeper water 1-;vthe action of undersea landslides. Failure of the bar occurs after ! ~years, in response to climatic events or, possibly, pore p r e s ~ w build-up due to biogenic activity, which changes the shc~: strength of the deposit or alters the local bottom slope. Build-t:i-~ and movement of the sediment has been modelled by comptatcr analysis. 855187 Development and runout of a detachment slide, Bracebriage Inlet, Bathurst Island, Northwest Territories, Canada Mathewson, C C; Mayer-Cole, T A Bull Assoc Engng GeM V21, N4. Nor 1984. P407-424 A detachment slide on a vegetated south facing slope of apprc~ximately 5 deg was investigated and it was concluded tim / iI developed due to a unique set of conditions: (1) wind dri\er~ snow was trapped along the lee of the valley ridge; (2) sum~vJ,=r melting provided water to the head of the slope: and (3) n~ei' water accelerated permafrost melting and developed excess pore pressures. The slide then continued as: ( 1) downhill creep aI the head of the slope increased stress on the vegetative mat until the tundra failed; (2) the slide overloaded the slope below, leading to a series of progressive detachments; until (3) as the strength of the slope materials increased with decreasing water content, the slide was halted. 855188 Hydrogeologic control and statistical prediction of active ~n~.ss movement Watson, I Bull Assoc Engng GeM V21, N4, Nor 1984. P479-494 Extensive research study has been carried out on landslide intensity for slopes with permeable materials overlying cohesixe soils. A steady supply of water to the slope initiates and reactivates mass movement, mainly by sustaining high pore pre~sm"e in the slope-forming materials. Hydrogeologic variables are considered in relation to other factors affecting mass movemerit. Collection of data from aerial photographs anE computer-assisted data handling have given results consis~ert with geotechnical theory and field data. The method described offers an approach for examining similar problems. 855189 Centrifugal model study of slope instability in Ottawa area Champlain Sea clay Goodings, D J; Schofield, A N Can Geotech J V22, N1, Feb 1985. P102-]09 Eight intact samples of quick Champlain Sea clay, formed v-~ 19 slope configurations, were tested on a 150g geotechnieal c:~trifuge. 14 samples showed some instability, from deep i~v:,c~ soil movement, to slope degradation, to flow sliding. },~o&~! behaviour suggests time-dependent horizontal stress relief ~,~a: precede failure, that failure is not circular and rotational. ~v.4 that uplift may affect subsequent retrogressions in protot~7~= landslides but not initial failure. The inconsistencies betweer model testing and real behaviour were discussed.