scholarly journals Earthflows at the Beattie Mine Quebec, Canada

1964 ◽  
Vol 1 (2) ◽  
pp. 104-114 ◽  
Author(s):  
W J Eden
Keyword(s):  
Soil Conditions ◽  
Remedial Measures ◽  
Sequence Of Events ◽  
The Stability ◽  
Clay Slopes ◽  
Varved Clay

In June 1943 an earthflow involving more than one million cubic yards of varved clay occurred at the Beattie Mine. Subsequent remedial measures resulted in further large landslides. This paper describes the soil conditions, the sequence of events, and attempts to assess the stability of the clay slopes. It was found that the undrained analysis led to an unsafe assessment but that Terzaghi's rule for critical heights of slope gave a better indication of stability.

Observations on some basal failures in sheeted excavations

1970 ◽  
Vol 7 (2) ◽  
pp. 136-144 ◽  
Author(s):  
V. Milligan ◽  
K. Y. Lo
Keyword(s):  
Shear Strength ◽  
Ground Water ◽  
Groundwater Level ◽  
Soil Conditions ◽  
Remedial Measures ◽  
Factors Influencing ◽  
Water Head ◽  
The Stability ◽  
Made In

In excavations below groundwater level, instability of the base may result from the inflow of water into the excavation. The most important factors influencing the stability are the ground water and detailed soil conditions at the site.Construction problems encountered in excavations in clay strata, underlain by pervious water bearing layers, are described. The remedial measures adopted in each case are also discussed. From a study of the observations made in the case records, it is suggested that excavation in intact clays may be carried out to depths exceeding that limited by the ratio of t/h = 0.5, where t is the distance from the bottom of the excavation to the top of the water bearing stratum, and h is the water head at the top of the water bearing stratum, provided that the clay is not disturbed during construction so that the shear strength of the clay is preserved.

Some difficulties associated with the limit equilibrium method of slices

1983 ◽  
Vol 20 (4) ◽  
pp. 661-672 ◽  
Author(s):  
R. K. H. Ching ◽  
D. G. Fredlund
Keyword(s):  
Slope Stability ◽  
Factor Of Safety ◽  
Limit Equilibrium ◽  
Stability Limit ◽  
Limit Equilibrium Method ◽  
Soil Conditions ◽  
Side Force ◽  
Limit Equilibrium Methods ◽  
Equilibrium Method ◽  
The Stability

Several commonly encountered problems associated with the limit equilibrium methods of slices are discussed. These problems are primarily related to the assumptions used to render the inherently indeterminate analysis determinate. When these problems occur in the stability computations, unreasonable solutions are often obtained. It appears that problems occur mainly in situations where the assumption to render the analysis determinate seriously departs from realistic soil conditions. These problems should not, in general, discourage the use of the method of slices. Example problems are presented to illustrate these difficulties and suggestions are proposed to resolve these problems. Keywords: slope stability, limit equilibrium, method of slices, factor of safety, side force function.

scholarly journals Review on Lateral Stability of Piled Riverine Structures in the Estuaries of Sarawak

2018 ◽  
Vol 7 (3.18) ◽  
pp. 21
Author(s):  
Lee Lin Jye ◽  
Shenbaga R. Kaniraj ◽  
Siti Noor Linda bt Taib ◽  
Fauzan Bin Sahdi
Keyword(s):  
Soft Soil ◽  
Natural State ◽  
Soil Conditions ◽  
Silty Clay ◽  
River Bank ◽  
Soil Movement ◽  
Geotechnical Problem ◽  
Construction Activity ◽  
Lateral Soil Movement ◽  
The Stability

Soft soil conditions with very soft and deep silty clay have constantly endangered the stability of the riverine and estuarine structures in Sarawak. There have been many failures of jetties, wharves and bridges in Sarawak. In many cases of failures, the piles were not designed to resist the lateral movement, unless they were included to stabilize unstable slopes or potential landslides. This practice may be due to reasons such as erroneously judging the river bank as stable in slope stability analysis or simply due to the inexperience of designers. Also, when the river bank approaches the limiting stability in its natural state any construction activity on the river bank could result in lateral soil movement. This paper highlights this important geotechnical problem in Sarawak. Then it presents the details of a few failures of estuarine structures. A review of situations causing lateral loading of piles is then presented. The results of the in-soil and in-pile displacement measurements are shown in this paper and it is found that the computation made to compare between field and 3D modeling is agreeable.  

Analysis of the Stability of Some Norwegian Natural Clay Slopes

Géotechnique ◽  
1957 ◽  
Vol 7 (1) ◽  
pp. 1-16 ◽  
Author(s):  
L. Bjerrum ◽  
B. Kjaernsli
Keyword(s):  
Natural Clay ◽  
The Stability ◽  
Clay Slopes

Geotechnical problems related to the building of a tailings dam on sensitive varved clay

1982 ◽  
Vol 19 (4) ◽  
pp. 472-482 ◽  
Author(s):  
N. U. Capozio ◽  
J. M. Ouimet ◽  
M. M. Dupuis
Keyword(s):  
Mine Tailings ◽  
Tailings Dam ◽  
Tailings Pond ◽  
Geotechnical Investigations ◽  
The Stability ◽  
Longitudinal Cracks ◽  
Geotechnical Problems ◽  
Varved Clay ◽  
Thick Deposit

At Noranda Mines in Matagami, Quebec, the construction of a 7-m tailings dam was begun in 1974 by hydraulically depositing mine tailings across a lake. A tailings pond was thus created upstream together with a downstream sedimentation pond regulated by a weir. The presence of longitudinal cracks along the crest of the dam was observed in 1978. This generated some doubts as to the stability of the dam which rests on a 24-m thick deposit of soft sensitive varved clay.Following a first study in 1978, the fissured area was used as a berm for yet another embankment which was built upstream of the unstable zone. In order to reevaluate the stability of the structure and the consequences of an eventual dam rupture, second and third geotechnical investigations were undertaken in 1980 and 1981. This paper presents the main conclusions of these investigations. It also includes the results of borings, in-situ vane tests, and stability analyses that were used to study the problem and made the planning of remedial measures possible.

Biological Markers: Their Use in Quantitative Assessments

1994 ◽  
Vol 8 (1) ◽  
pp. 92-99 ◽  
Author(s):  
M.F. Vine
Keyword(s):  
Biological Markers ◽  
Epidemiologic Study ◽  
Biological Marker ◽  
Cost Effective ◽  
Early Response ◽  
Biological Media ◽  
Sequence Of Events ◽  
Effective Manner ◽  
The Stability ◽  
Sensitivity Specificity

Biological markers can be conceptualized in terms of categories of markers that form a continuum representing a sequence of events from exposure to disease. These categories include markers of internal dose, biologically effective dose, early response, and disease. Outside of this sequence are susceptibility factors that can act at any point along the way to modify the effects of external exposures on disease outcomes. Examples of the use of these different types of markers in epidemiologic research are provided. There are many factors that one must consider when selecting a biological marker for use in an epidemiologic study. These factors include: the objectives of the study, the availability and specificity of potential markers, the feasibility of measuring the markers in various biological media, the invasiveness of the techniques necessary to measure the markers, the amount of biological specimen needed for analysis, the time to appearance of the markers in the biological media, the persistence of the markers in biological media, the variability of marker levels within and between individuals, the stability of markers in storage, as well as the cost, sensitivity, specificity, and reliability of the assays used to measure the markers. Each of these characteristics is discussed. The usefulness of biological markers in an epidemiologic study depends on the objectives of the study and whether the properties of the markers fulfill the objectives of the study in a feasible and cost-effective manner.

scholarly journals Evidence of creep in steep natural slopes of Champlain Sea clay

1977 ◽  
Vol 14 (4) ◽  
pp. 620-627 ◽  
Author(s):  
W. J. Eden
Keyword(s):  
Groundwater Table ◽  
Bridge Superstructure ◽  
The Stability ◽  
Clay Slopes ◽  
Natural Slopes

Three types of evidence of deep seated creep of steep natural slopes are considered: surface manifestations such as fissures and depressions; inclinometer measurements on three slopes in the Ottawa area; and movements of a bridge superstructure spanning a steep sided ravine.Results of measurements show that the movements are not continuous but occur in response to seasonal high levels of the groundwater table. The implications of the movements are discussed in relation to the stability of clay slopes.

scholarly journals Assessment of the Cause and Effect of Early Damage of Cobble Stone Road Construction and Its Remedial Measurements: A Case of Nekemte Town Cheleleki Sub City

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Shiferaw Garoma Wayessa ◽  
Ayana Abera Beyene
Keyword(s):  
Field Tests ◽  
Road Construction ◽  
Fine Aggregate ◽  
Remedial Measures ◽  
Development Programs ◽  
Construction Time ◽  
Structural Failures ◽  
The Stability ◽  
Sequence Quality

Road constructing in Ethiopia is increasingly in demand to meet its medium and long term development programs. Most internal road of Oromia cities/town are cobblestone and gravel. Some portions along the alignment proposed and existing roads traversed low resistance of the subgrade that affect the stability of upper layers of cobblestones.  Structural failures are observed on cobblestones roads, would it be constructed by good quality or low quality of materials. Nekemte Cobblestones Projects have been started in 2014 widely which were failed in most area today as we observed that needs to be addressed and a corresponding remedial measures must be drawn. A possible remedial measures had been organized for every observed  failure  or  destroyed  to  obtain  normal  road  condition  of  the study  area. An assessment was made by using observation, interviews, laboratory and field test to determine the adequacy of the cobblestones, underlain material to serve as a subgrade for road construction based on project specifications and Ethiopian Road Authority (ERA) low volume road Specification. From the field tests and laboratory tests carried out, it is observed that the causes of cobblestone road failures of this road section are mainly due to the construction steps/sequence, quality of materials, road construction time, lack of proper design and quality control, absences of drainage structures, lack of highly compaction, lack of accurately fill fine aggregate and suddenly high loads vehicle applied on cobblestone road.

scholarly journals INVESTIGATION OF THE CAUSES OF THE SLIDING ON THE 123KM ON THE KORINTHOS-TRIPOLIS NATIONAL ROAD AND WORKING TECHNIQUES TO RESTORE THE STABILITY

2004 ◽  
Vol 36 (4) ◽  
pp. 1781
Author(s):  
Π. Μαρίνος ◽  
M. Καββαδάς ◽  
Γ. Ντουνιάς ◽  
Α. Προβιά
Keyword(s):  
Drainage Network ◽  
Remedial Measures ◽  
Additional Load ◽  
The Road ◽  
The Past ◽  
Unstable Slope ◽  
The Stability ◽  
Remedial Work ◽  
National Road ◽  
Geomorphological Features

The paper deals with the important landslide of a 220m width at the area of the 123km on the Korinthos-Tripolis national road as well as the remedial measures in order to restore the stability of the road. The sliding caused the traffic interruption on the national road at 08/02/2003 and for the next two months. The service was restored after the development of a bypass road on the same position with the sliding. The geomorphological features of the area indicate that there were sliding problems in the past which they became serious after the construction of the national road by the additional load of the embankment of the road and the increased infiltrations. The main remedial work was the toe buttress of the unstable slope by the construction of a 15m high fence in the valley and appropriate drainage on the foot of the sliding and at the same time it is re-arranged the riverbed through the development of a sewer along with the use of a drainage network.

scholarly journals Influence of Both Soil Properties and Geometric Parameters on Failure Mechanisms and Stability of Two-Layer Undrained Slopes

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Shuangfeng Guo ◽  
Ning Li ◽  
Wenpeng Liu ◽  
Zongyuan Ma ◽  
Naifei Liu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Slope Angle ◽  
Strength Parameter ◽  
Strength Ratio ◽  
Stability Number ◽  
Parametric Studies ◽  
The Stability ◽  
Clay Slopes

The stability of the two-layer undrained clay slopes should be given considerable attention since they are commonly observed in nature and in manmade structures, and they traditionally have low stability. Therefore, with the elastoplastic finite element method, this paper thoroughly explores the influence of the soil strength parameter cu, slope angle β, and slope depth ratio DH on the slope stability and failure mechanisms by the wide-ranging parametric changes. The aims of this study are also to find the critical strength ratio (cu2/cu1)crit and the maximum values of the stability number Nc that were observed in the parametric studies. Numerical results are displayed in the form of charts to give Nc and (cu2/cu1)crit as a function of cu, β, and DH. Moreover, influences of DH and β on Nc and failure mechanisms are examined in this study. The results of numerical analysis demonstrate that cu2/cu1 significantly affects both the critical failure mechanism and the stability of the two-layer undrained slope. Improved knowledge of the location of the critical failure mechanism allows for accurately estimating the stability of the two-layer undrained slopes for future strengthening measurements to preserve stability.

Sign in / Sign up

Export Citation Format

Share Document