Active slide in Tertiary bentonitic claystones, Upper Hat Creek, British Columbia

1986 ◽  
Vol 23 (2) ◽  
pp. 164-173 ◽  
Author(s):  
G. E. Rawlings
Keyword(s):  
British Columbia ◽  
Preventive Measures ◽  
Back Analysis ◽  
Panama Canal ◽  
Open Pit ◽  
Failure Plane ◽  
Debris Slide ◽  
Field Investigations ◽  
Engineering Significance ◽  
Potential Exploitation

Potential exploitation of the 500 m thick coal deposit at Upper Hat Creek, British Columbia, required detailed investigation of the sequence of Tertiary tuffaceous rocks surrounding the coal and the overlying surficial materials. Studies have shown that extensive bentonitic slide deposits partially cover the coal body on the west side of Hat Creek valley; part of this area is currently active. A translational debris slide of approximately 17 × 106 m3 volume and 2 km length is moving across the northwest boundary of the proposed pit into the valley bottom.Detailed field investigations complemented by laboratory testing have defined the basal plane of sliding and permitted a back-analysis to be made. From measured piezometric pressures, the mobilized shear strength on the failure plane is calculated to be [Formula: see text], cr′ = 0, which is largely in accord with laboratory test results.Slope stability in thick montmorillonite-rich claystones/siltstones is known to present difficulties, as evidenced by the Panama Canal excavations. Consideration is given to the engineering significance of bentonitic slides and preventive measures that might be adopted in their control. Key words: active slide, Tertiary, claystone, montmorillonite, open pit, coal, monitoring, residual strength, piezometric pressures.

The engineering significance of Pleistocene stratigraphy in the Saskatoon area, Saskatchewan, Canada

1970 ◽  
Vol 7 (2) ◽  
pp. 116-126 ◽  
Author(s):  
A. B. MacDonald ◽  
E. Karl Sauer
Keyword(s):  
Three Dimensional ◽  
Field Studies ◽  
Engineering Properties ◽  
Shear Strength Parameters ◽  
Tunnel Excavation ◽  
Glacial Sediments ◽  
Stratigraphic Analysis ◽  
Field Investigations ◽  
Stratigraphic Framework ◽  
Engineering Significance

It was recognized that repeated stages and substages of glaciation in Saskatchewan during the Pleistocene Epoch produced a series of overlapping sediments. It was shown that these sediments could be analyzed for engineering purposes within a three-dimensional stratigraphic framework. Preliminary field investigations indicated that a stratigraphic analysis could be related to construction problems found on highway embankment construction, gravel location, and tunnel excavation. Field studies established that it is practical for the field engineer to analyze and interpret the stratigraphy in the field. Furthermore, laboratory studies indicated that there were significant differences in the engineering properties of different drift-stratigraphic units. It was shown that the behavior of the till units during construction could be explained in terms of the fundamental engineering properties of soils such as shear strength parameters and compressibility. Finally, it appeared to be probable that the basic concepts developed in this study would apply to other areas covered by glacial sediments.

THE INFLUENCE OF BURNING ON THE SOIL IN THE TIMBER RANGE AREA OF LAC LE JEUNE, BRITISH COLUMBIA: I. PHYSICAL PROPERTIES

1959 ◽  
Vol 39 (1) ◽  
pp. 1-5 ◽  
Author(s):  
J. D. Beaton
Keyword(s):  
British Columbia ◽  
Physical Properties ◽  
Soil Temperature ◽  
Total Porosity ◽  
Infiltration Rate ◽  
Soil Cores ◽  
Capillary Porosity ◽  
Field Investigations

Three-inch soil cores were taken in triplicate from areas that had been burned in 1943, 1945, 1945 and 1951, and from corresponding unburned areas present within each burned-over area.Studies carried out on these cores taken from the 0 to 3-inch layer of soil revealed that, as a result of burning, there were decreases in total porosity and non-capillary porosity and an increase in capillary porosity. Field investigations showed that there was a decrease in the infiltration rate of burned soils and that there was an increase in soil temperature at a depth of 3 inches in burned soils.

Back analysis and radar interferometry monitoring in a large open pit slope

2014 ◽  
pp. 925-930
Author(s):  
C González-Nicieza ◽  
M Álvarez-Fernández ◽  
O Mora ◽  
E Amor-Herrera
Keyword(s):  
Back Analysis ◽  
Radar Interferometry ◽  
Open Pit

scholarly journals Parameter inversion and location determination of evolutionary weak layer for open-pit mine slope

2020 ◽  
Vol 7 (4) ◽  
pp. 714-724
Author(s):  
Zhao Hongze ◽  
Wang Dongyu ◽  
Ma Ming ◽  
Zheng Kaihui
Keyword(s):  
Shear Failure ◽  
Back Analysis ◽  
Friction Angle ◽  
Dynamic Mechanical Properties ◽  
Simulation Software ◽  
Open Pit Mine ◽  
Monitoring Data ◽  
Open Pit ◽  
Open Pit Mines ◽  
Parameter Inversion

AbstractIn light of the complex and dynamic mechanical properties of evolving weak strata in open-pit mines, and the consequent difficulty of determining their mechanical parameters, this study uses the ultimate balance theory, along with the back analysis method combined with monitoring data on field displacement, to carry out parameter inversion using the FLAC3D numerical simulation software. The edge slope of a working pit of the Weijiamao open-pit mine was used as research object to this end. As the results obtained by the constitutive model were consistent with the field monitoring data, the evolving weak strata in the slope and the position of the landslide in the mine could be obtained. The landslide was directed northeast. The mechanism of the edge slope of the working pit was identified as unloading shear failure, and the feasibility of the method of parameter inversion was verified. The internal friction angle ϕ and cohesion C of evolving weak strata in the slope of the open-pit mine were also obtained, where this compensated for the deficiency of laboratory tests and enabled the transformation from qualitative to quantitative analysis. This can provide a reliable basis for the safe operation of open-pit mines.

scholarly journals Dynamic Matrix for an Adaptive Environment Management in Mining: A Feed-engineering Alternative?

2018 ◽  
Vol 7 (2) ◽  
pp. 193
Author(s):  
S. B. Mondoukpe Lagnika ◽  
Robert Hausler ◽  
Mathias Glaus
Keyword(s):  
Environmental Factors ◽  
Evaluation System ◽  
Preventive Measures ◽  
Open Pit ◽  
Mining Operations ◽  
Dynamic Matrix ◽  
Environmental Impact Assessments ◽  
Adaptive Environment ◽  
The Impact ◽  
Over Time

Environment impacts are usually determined by quantification or an evaluation system derived from several methodologies including environmental assessment, matrices, and data cross-referencing. This study uses a dataset obtained from validated mining Environmental Impact Assessments (EIAs), some monitoring reports and scientific insights on open-pit mines (OPM). The purpose here is to build a dynamic matrix system over time to facilitate a systemic evaluation of environmental impacts and to find in-depth preventive measures in any OPM. The four dynamic matrices are built with qualitative and numerical values in both magnitude and significance terms. As one of the issues is to minimize negative risks in OPMs, one outcome points out the environmental factors of mining operations sensitive to the variations over time and the variability of the parameters themselves. The results show secondly that the data (qualitative and quantitative) vary from EIA stage to a post EIA status like activities or environmental factors numbers. Thirdly, the impact of activities on each part of environment components and the incidence of all activities during the mines’ life cycle is easier to identify whatever the data density. In the fourth line, this paper indicates that the dynamic matrix in an optimal alternative in the process of determining preventive measures to mitigate the risks and the need for an interactive environmental follow-up program in mining or similar industry. This approach reduces the following-up monitoring weaknesses and allows managers, as a multi-criterion decision-making approach, to take enlightened actions.

Estimation of horizontal regional stresses at an open-pit limestone mine by back analysis

2002 ◽  
Vol 6 (3) ◽  
pp. 175-180
Author(s):  
Seong-Seung Kang ◽  
Jun-Mo Kim ◽  
Katsuhiko Kaneko ◽  
Yuzo Obara
Keyword(s):  
Back Analysis ◽  
Open Pit ◽  
Regional Stresses

Application of a rock buttress in the design of slopes of a strip coal mine adjacent to a highway

1993 ◽  
Vol 30 (3) ◽  
pp. 391-408 ◽  
Author(s):  
R. Ulusay ◽  
M.F. Yolerì ◽  
V. Doyuran
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Back Analysis ◽  
Bedding Plane ◽  
Open Pit ◽  
State Highway ◽  
Planar Surfaces ◽  
Thermal Coal ◽  
Basal Sliding ◽  
The Stability

Eskihisar open pit mine, located at Yatagan, southwest Turkey, produces thermal coal for a power generating plant. As mining of strips advanced southwards, instability appeared to be highly critical due to the movements in the southeast wall slopes adjacent to the state highway running parallel to the pit boundary. This situation called for an immediate response to initiate a detailed geotechnical investigation program and to redesign the pit slopes. This paper outlines the most probable mode and mechanism of instability along the southeast wall, as well as field and laboratory studies, results of back analysis, discussion of the data requirements, and results of slope stability analyses performed to ensure adequate overall stability. The studies revealed that the most critical failures may occur along two or three planar surfaces, by combination of fault, bedding plane, and localized strata steepening adjacent to the fault, in multiplanar failure mode controlled by faulted blocks. The stability is sensitive to changes in length of the lower part of the basal sliding surface, as well as to the configuration and shear strength of black and highly plastic underclay. The effects of a buttress of intact rock and slope flattening on the stability are compared and discussed. Key words : back analysis, multiplanar failure, shear strength, slope stability, toe buttressing.

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