Engineering-geological characteristics and classification of the major superficial soils of the Niger Delta

881024 Instrumentation m groundwater

Properties of Rocks and Soils

Charles, J A

In: Groundwater m Engtneer:ng Geology (papers to the 21st Annual Conference of the Engmeermg Group of the Geological Society, She~eld, 15-19 September, 1985) P259262 Publ London Geologwal Society, 1986 The baste relationships for groundwater flow are presented Instrumentation to measure rate of flow, tracer techmques to measure seepage flow, measurement of permeability and hydrauhc gradients, the use of mfrared thermography to detect concentrated leakage or flow, and the measurement of settlement caused by groundwater flow are d~scussed

881028 Engineermg-geologicai characteristics and classificataon of the major superficial sods of the Niger Delta Akpokodje, E G

Engng Geol V23 N3/4, Julv 1987 P193-211

See also 881100

A survey of superficml sods m the Niger Delta was eat'ned out Four major sod groups were recogmsed on the basts of similarity m geotechmcal, geological, and geomorphologacal properties The sods are essentmlly fine gramed clays contammg sand, slit. and orgamc matter Clay, sdt. and orgamc content mcrease seaward Particle size distribution, moisture content, plasticity, bulk density, and compaction, strength, and compresstbthty properties were recorded Geotechmcal properties are largely mfluenced by composition

881025 Economic and environmental imphcations of leakage upon m sltu uranium mining

881029 Engmeering characterlst~cs of British over-consolidated clays and mudrocks, !!. Mesozoic deposits

Chemical and physical changes due to water

Poptelak, R S, Siegel, J

Crtpps, J C, Taylor, R K

Min Engng V30, N8 Aug 1987, P800-804

Engng Geol V23, N3/4, July 1987 P213-253

The computer program TRACER3D was used to simulate hxtvmnt travel paths for m sttu leachmg of an ore zone aquifer under various degrees of confinement and for a stratified ore zone aquifer Two rejection wells and a stogie pumpmg well are assumed Leakage affects the economics of m sttu mmmg by mcreasmg the time reqmred to leach out the ore and mcreasmg the thickness of the ore zone to be restored Environmental effects appear mmlmal as m all cases the hxtwant d~d not contact the confinmg strata

Pubhshed geotechmcal data have been collected and collated Classification, shear strength, deformabdtty, permeabthty, consohdation and other geotechmcal properties are tabulated Variations m parameters are d~scussed In terms of mmeralogy, location, and geological loadmg history Weathermg ts the major cause of variations and, to a lesser extent, samphng and testing procedures The reformation ~s discussed with a wew to asslstmg mterpretatlon of new data from argillaceous horizons

881026 Dramage-mduced land subsidence m metropohtan New Orleans, Louisiana, U.S A.

881030 In-sltu testmg of peat

Snowden, J O

In. Use of In Sttu Tests :n Geotechmcal Engmeermg (papers to the Conference, Blacksburg, 23-25 June 1986) P191-205 Publ Ne~ York ASCE, 1986 (ASCE Geotechmcal Spec:al Pubhcatton No 6 J

Proc 3rd Internat:onal Symposium on Land Subsadence, Vemce, 19-25 March, 1984 P507.527 Publ Walhngford IAHS. 1986 Factors affectmg land subsidence on dramage and reclamation, primary and secondary consohdatton, shrmkage, sod type and thickness, are mtroduced Knowmg these, It ~s possible to predict areas hable to future hazardous subsidence, and to modify dramage systems to keep subsidence prone sods as moist as possible A number of case studles showmg foundation design, dIfferentml settlement and long term behav~our are presented

881027 Natural and mduced smkhole development in the eastern United States Newton, J G

Proc 3rd International Symposium on Land Subsidence, Venice, 19-25 March. 1984 P549-564 Publ Walhngford IAHS, 1986 A survey has found sinkhole development m 19 of the 31 eastern states of the USA Structural damage or pollutlo'a of groundwater may follow smkhole formation Smkholes can be divided mto two categories, reduced (accelerated or caused by man) and natural Most of the former class result from groundwater level drop due to pumpmg or diversion or impoundment of surface water Natural smkholes arise from progresswe solution of the bedrock and from natural water level dechnes which trigger the same mechamsms as cause reduced smkholes

Landva, A

The fibrous nature of peat and peaty orgamc soils affects their mode of deformation and fadure, and many 'standard' geotechmcal tests, such as plate load, static cone penetration, and vane shear, are mapphcable For construction on peatlands, the only meanmgful field test is the use of test fills, and this is hm~ted by practical considerations It is suggested that laboratory testmg under controlled condlhons may be more representative of field conditions than are standard field tests

881031 Pressuremeter correlations for preconsohdated clay Martm, R E. Drahos, E G

In" Use of In Sau Tests in Geotechmcal En&meermg (papers to the Conference, Blacksburg, 23-25 June 1986) P206-220 Publ New York ASCE. 1986 (ASCE Geotechmcal Special Pubhcatton No 6) Design parameters for foundations m the sensitive, highly preconsohdated clays underlymg Richmond, Vlrgmta, USA, are often based on results of conventional tnaxtal compression and consohdatlon tests Menard pressuremeter test results have recently been used tn foundation design Correlations between undrained shear strength, preconsohdatton pressure, and constramed reload modulus from laboratory and pressuremeter tests are presented

C~ 1988 Pergamon Press pie Reproduction not permitted