Construction de la digue nord de l'aménagement La Grande

1995 ◽  
Vol 22 (4) ◽  
pp. 723-735 ◽  
Author(s):  
Michel Massiéra ◽  
Jerry Levay
Keyword(s):  
Special Design ◽  
Marine Clay ◽  
River Sand ◽  
Hydroelectric Project ◽  
The North ◽  
Foundation Treatment ◽  
Construction Techniques ◽  
North Bank ◽  
Slurry Trench ◽  
Sensitive Marine Clay

LG-1 hydroelectric project, part of La Grande Complex in northern Quebec, required the construction of a 2444 m long dyke on the north bank. The presence of sensitive marine clay, with deltaic and river sand and silt deposits on top of the clay in the central terrace, called for special design features. These included the construction of a dyke with side berms in a depression to ensure stability and the construction of a cement–bentonite cutoff through the sand and silt deposits of the terrace. This paper describes the different phases of dyke construction with emphasis on foundation treatment and construction techniques. Key words: bentonite, cement, clay, construction, cutoff, dyke, excavation, foundation, slurry, trench.

Stabilisation de la berge rive nord de l'aménagement hydroélectrique La Grande 1

2000 ◽  
Vol 37 (1) ◽  
pp. 40-55
Author(s):  
Michel Massiéra ◽  
Jean-Pierre Tournier
Keyword(s):  
Special Design ◽  
Marine Clay ◽  
River Sand ◽  
River Bank ◽  
The North ◽  
North Bank ◽  
Sand Deposit ◽  
Sensitive Clay ◽  
Sensitive Marine Clay ◽  
Bank Stabilization

The La Grande 1 (LG-1) hydroelectrical project, part of the La Grande Complex in Northern Quebec, required the construction of a 2444 m long dyke on the north bank of the river. The presence of sensitive marine clay, covered with deltaic sand and silt deposit, and river sand deposit, called for special design features such as downstream bank and upstream bank stabilization berms to avoid the occurrence of potentially disastrous retrogressive slides. This paper describes the geotechnical and hydrogeological conditions of the northern terrace and presents the different construction phases of the riverbank stabilization, with emphasis on the control of groundwater pressures in the lower aquifer by the use of relief wells.Key words: sensitive clay, river bank, dyke, rockfill, relief well, slope stability.

Construction de la paroi au coulis ciment-bentonite sous la digue nord de l'aménagement hydroélectrique La Grande 1

1999 ◽  
Vol 26 (2) ◽  
pp. 145-155 ◽  
Author(s):  
Michel Massiéra ◽  
Jerry Levay
Keyword(s):  
Design Features ◽  
Marine Clay ◽  
River Sand ◽  
Hydroelectric Project ◽  
North Shore ◽  
The North ◽  
Slurry Trench ◽  
Sensitive Marine Clay

As part of the La Grande complex, in northern Québec, the development of the LG-1 hydroelectric project required the construction of a 2444 m long dyke on the north shore. The presence of a wide sensitive marine clay terrace covered with deltaic and river sand and silt deposits called for several design features, including the construction of a cement-bentonite cutoff through the sand and silt deposits on the terrace. This paper describes the different construction phases of the cement-bentonite cutoff with emphasis on excavation procedure and quality control.Key words: bentonite, cement, construction, cutoff, excavation, slurry trench.

Thunder Creek mercury control

1992 ◽  
Vol 19 (3) ◽  
pp. 478-491
Author(s):  
M. D. Haug ◽  
D. J. L. Forgie ◽  
R. Zitta ◽  
B. E. Bews
Keyword(s):  
Contaminated Sediments ◽  
Control Measures ◽  
Mercury Contamination ◽  
Cutoff Wall ◽  
Control Plan ◽  
The North ◽  
North Bank ◽  
Slurry Trench ◽  
Mercury Control ◽  
Floodplain Sediments

In 1978, mercury contamination was discovered in sediments near the confluence of Thunder Creek and the Moose Jaw River, in the City of Moose Jaw, Saskatchewan, Canada. A detailed investigation revealed up to 95 mg/kg of mercury in the floodplain sediments. This contamination was primarily concentrated along the north bank of Thunder Creek and in the adjacent creek sediments. The extent of the contamination indicated that it had not occurred recently, and that total removal of the mercury would be difficult and costly. Thus, a mercury control plan was initiated to remove or effectively contain 95% of the contamination. Contaminated sediments were excavated by dragline from the floodplain and placed on top of mercury contaminated surface sediment along the north bank of Thunder Creek. A soil backfill slurry trench cutoff wall was constructed along the creek through permeable soils and keyed into a low permeability clay shale to isolate the contaminated sediments. The contaminated sediments were also isolated by the construction of an interceptor ditch to direct water around the containment area past the cutoff wall. The contaminated sediments were compacted and covered with lime-modified clay and a topsoil cover which was seeded with grass. Monitoring of water and sediments along Thunder Creek and the Moose Jaw River since implementation of these control measures has shown a significant reduction in mercury levels, indicating that the control system is meeting its objectives. Key words: mercury, environment, contamination, mitigative measures, slurry trench cutoff, interceptor drains, monitoring.

scholarly journals Sedimentation processes and sedimentary characteristics of tidal bores along the north bank of the Qiantang Estuary

2012 ◽  
Vol 57 (13) ◽  
pp. 1578-1589 ◽  
Author(s):  
DaiDu Fan ◽  
GuoFu Cai ◽  
Shuai Shang ◽  
YiJing Wu ◽  
YanWei Zhang ◽  
...  
Keyword(s):  
Sedimentary Characteristics ◽  
The North ◽  
Tidal Bores ◽  
North Bank ◽  
Sedimentation Processes

A Carved Stone from D'Arcy, Saskatchewan

1940 ◽  
Vol 5 (4) ◽  
pp. 334-335
Author(s):  
Vladimar Alfred Vigfusson
Keyword(s):  
North America ◽  
Late Pleistocene ◽  
Glacial Lake ◽  
Bering Strait ◽  
The North ◽  
Gravel Pit ◽  
North Bank ◽  
The Town

In recent years, the attention of some archaeologists has been directed to the Canadian Northwest with the expectation of finding some evidence or indication of the early migrations of man on this continent. That man reached North America by Bering Strait from Asia, is generally accepted, but the theory that the migrations took place in late Pleistocene times and by way of an open corridor between the Keewatin ice and the Rockies, requires confirmation. It is significant that Folsom and Yuma points from Saskatchewan, described by E. B. Howard, were found mainly in areas bordering the ancient glacial Lake Regina.As a further contribution to this problem, it seems desirable to present a brief description of a carved stone relic found in gravel in central Saskatchewan about three years ago.The stone was found about seven miles southeast of the town of D'Arcy in a gravel pit located on Sec. 9, Tp. 28, Rge. 18, W. 3rd Meridian, on the north bank of a ravine running east into Bad Lake.

The Social Structure of Modern Bamako

Africa ◽  
1965 ◽  
Vol 35 (2) ◽  
pp. 125-142 ◽  
Author(s):  
Claude Meillassoux
Keyword(s):  
Social Structure ◽  
The North ◽  
The Social ◽  
North Bank ◽  
Niger River ◽  
Opening Paragraph ◽  
The Town

Opening ParagraphAccording to a partial census taken in 1960, Bamako city has about 130,000 inhabitants. Small by Western standards, it is still by far the largest city in Mali. At the time of the French conquest Bamako had only between 800 and 1,000 inhabitants; it was the capital of a Bambara chiefdom, grouping about thirty villages on the north bank of the Niger river, with a total of about 5,000 people. The ruling dynasty was that of the Niaré, who, according to their traditions, came from the Kingi eleven generations ago (between 1640 and 1700). For defence against the neighbours and armed slave-raiders fortifications were built around the town and a permanent army of so-fa (horsemen) was raised. Soon after its foundation Bamako attracted Moslem Moors from Twat who settled as marabouts and merchants under the protection of the Niaré's warriors. Among them, the Twati (later to be called Touré) and the Dravé became, alongside and sometimes in competition with the Niaré, the leading families.

Construction Techniques of Deep Diaphragm Wall in the Yellow River-Crossing Project in South-to-North Water Transfer

2011 ◽  
Vol 250-253 ◽  
pp. 1212-1216
Author(s):  
Da Hu Rui ◽  
Qing Hong Wu ◽  
Zhen Feng Cao ◽  
Yu Xia Zhao ◽  
Guang Fan Li
Keyword(s):  
Yellow River ◽  
Water Transfer ◽  
Diaphragm Wall ◽  
Shield Tunnel ◽  
Medium Sand ◽  
Construction Techniques ◽  
Geological Conditions ◽  
North Bank ◽  
Guide Wall ◽  
North Water

Yellow River-Crossing Project in South-to-North Water Transfer approach through the use of shield tunnel and its north bank departure shaft adopts diaphragm wall as enclosure structure. The depth of continuous wall of its shielding starting shaft is 76.6m, which is the deepest at present in china. The continuous diaphragm wall travels through the layer of silver sand, medium sand and loam from top to bottom, where the geological conditions are poor with large difficulty of construction. This paper sets forth construction of guide wall, reinforcing measures before construction, Trenching process, groove segment connections, innovative technologies of uplifting huge reinforcing cage and so on, which will provide guidance and lessons for the similar project

Thirty years of secondary consolidation in sensitive marine clay: Reply

1991 ◽  
Vol 28 (3) ◽  
pp. 468-469
Author(s):  
C. B. Crawford ◽  
M. Bozozuk
Keyword(s):  
Marine Clay ◽  
Sensitive Marine Clay
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