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 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.

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.

An earthflow in sensitive Champlain Sea sediments at Lemieux, Ontario, June 20, 1993, and its impact on the South Nation River

1994 ◽  
Vol 31 (3) ◽  
pp. 384-394 ◽  
Author(s):  
S.G. Evans ◽  
G.R. Brooks
Keyword(s):  
Water Quality ◽  
Stability Number ◽  
The South ◽  
Marine Clay ◽  
Landslide Mass ◽  
Sensitive Clay ◽  
Leda Clay ◽  
Sensitive Marine Clay ◽  
The Stability ◽  
Landslide Debris

A large (est. volume 2.8 × 106 m3) landslide occurred in sensitive Leda clay on the east bank of the South Nation River at Lemieux, Ontario (45.4°N, 75.06°W), on June 20, 1993. The earthflow involved an area of about 17 ha and retrogressed a total of 680 m, 555 m into the flat plain above the river. No lives were lost but a motorist was injured when he drove into the landslide crater. The 1993 landslide occurred 4.5 km downstream of the well-known 1971 South Nation River landslide along a stretch of river that had experienced other historical landslides in 1895 and 1910. A band of earlier, undated, retrogressive sliding, between 100–130 m in width, was present at the base of the slope that failed in 1993, and the earthflow was probably triggered by a reactivation of these failures. Borehole information obtained in 1986 and 1987 in the vicinity of the landslide indicates that a zone of soft, sensitive marine clay existed beneath the flat farmland, which was overlain by a stiffer cap consisting of laminated marine-estuarine sands and deltaic silts and sands. The morphology of the debris suggests a mechanism that involves the fluidization of much of the landslide mass and subsidence, translation, and rotation of cap blocks. The stability number for the site was approximately 9.6, suggesting that the flow could have occurred as a result of extrusion of the soft sensitive clay layer due to undrained cap loading. Landslide debris temporarily blocked the South Nation River, causing flooding upstream and adversely affecting water quality downstream. Key words : landslide, earthflow, sensitive clay, debris hazards, water quality.

Wyclif and the North: The Evidence from Durham

1999 ◽  
Vol 12 ◽  
pp. 87-103
Author(s):  
Anne Hudson
Keyword(s):  
The South ◽  
River Bank ◽  
The North ◽  
North Bank ◽  
The Village ◽  
John Wyclif

The present-day hamlet of Wycliffe stands on a small spit of level ground on the south bank of the river Tees, some seven miles east of Barnard Castle, at a point where the north bank rises in a high cliff; the churchyard stretches almost to the river bank. The claim that John Wyclif takes his name from the village cannot, unless further documentation is discovered, be finally proved; but it seems a reasonable one. Robert Wyclif, a clerk in the diocese of York, acted on behalf of John in 1371 in regard to tithes from an alien priory granted to the latter by the king, and again in 1376 to pay part of the annates claimed by the papal collector Arnald Gamier for the prebend of Caistor, a prebend from which Wyclif was displaced by the appointment of the papal provisor Philip Thornbury.

Displacement-pile behaviour in a soft marine clay

1994 ◽  
Vol 31 (2) ◽  
pp. 181-191 ◽  
Author(s):  
B.M. Lehane ◽  
R.J. Jardine
Keyword(s):  
Key Words ◽  
Effective Stress ◽  
Field Experiments ◽  
Imperial College ◽  
Marine Clay ◽  
Sensitive Clay ◽  
Sensitive Marine Clay ◽  
Major Factors

The paper presents the results of field experiments performed using the Imperial College instrumented displacement pile in a soft, sensitive marine clay at Bothkennar, Scotland. These results are compared with data from similar programmes of experiments performed in other clay types with this pile so that some of the major factors controlling displacement-pile performance may be identified. Key words : displacement pile, instrumentation, sensitive clay, effective stress design.

scholarly journals Thirty years of secondary consolidation in sensitive marine clay

1990 ◽  
Vol 27 (3) ◽  
pp. 315-319 ◽  
Author(s):  
C. B. Crawford ◽  
M. Bozozuk
Keyword(s):  
Key Words ◽  
Surface Load ◽  
Marine Clay ◽  
Case Record ◽  
Final Value ◽  
Effective Stresses ◽  
Sensitive Clay ◽  
Sensitive Marine Clay

This case record shows that when a surface load is applied to a sensitive, normally consolidated clay, the effective stresses increase rapidly to the measured preconsolidated stresses, and remain at that level while consolidation continues for several decades. Only after more than 30 years was there an indication that the in situ effective stresses were beginning to increase to their final value. These observations have important implications with respect to the design of foundations in such areas. Key words: consolidation, foundations, secondary consolidation, sensitive clay settlements, marine clay.

Past Verses Present; Metamorphosis in Different Spheres of Guwahati: A Study of Srutimala Duara’s Mindprints of Guwahati

2020 ◽  
Vol 8 (2) ◽  
pp. 13
Author(s):  
Ankita Pandey
Keyword(s):  
Point Of View ◽  
Areca Nut ◽  
Medieval Period ◽  
River Bank ◽  
North East India ◽  
North East ◽  
The North ◽  
Indian State ◽  
The City ◽  
Beautiful City

Guwahati derives its name from the Assamese word “Guwa” means areca nut and “Haat” means market. However, the modern Guwahati had been known as the ancient Pragjyotishpura and was the capital of Assam under the Kamrupa kingdom. A beautiful city Guwahati is situated on the south bank of the river Bramhaputra. Moreover, It is known as the largest city in the Indian state of Assam and also the largest metropolis in North East India. It has also its importance as the gateway to the North- East India. Assamese and English are the spoken languages in Guwahati.  In 1667, the Mogul forces were defeated in the battle by the Ahom forces commanded by Lachut Barphukan. Thus, in a sense Guwahati became the bone of contention among the Ahoms, Kochas and the Moguls during the medieval period.  Guwahati the administrative headquarters of Lower Assam with a viceroy or Barbhukan was made by the Ahom king.  Since 1972 it has been the capital of Assam. The present paper will discuss the changes happened in Guwahati over the period of late 1970s till the present time. It will focus on the behavior of people, transformed temples, Panbazar of the city, river bank of Bramhaputra, old Fancy Bazaar, chaotic ways, festivals and seasons including a fifth man made season etc. It will also deal how over the years a city endowed with nature’s gifts and scenic views, has been changing as “a dirty city”. Furthermore, it will also present the insurgencies that have barged into the city. The occurrence of changes will be discussed through the perspective and point of view of Srutimala Duara as presented in her book Mindprints of Guwahati.

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.

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