โ Scribed by R. Ulusay; V. Doyuran
No coin nor oath required. For personal study only.
This paper describes the geotechnical investigations and the stability analysis of a multiple retrogressive circular failure developed through a few benches cut in deposits of a weak transition zone at a strip coal mining area, southwest Turkey. The instability was analyzed to understand the possible causes of failure and to determine mobilized shear strength at the time of failure through the use of back analysis.
Geotechnical investigations comprised geological mapping, review of drill core and groundwater data, sampling and laboratory testing, and back analysis of the failure. The failed material is essentially composed of poorly consolidated claystone, which is a clay in engineering terms, and minor amounts of clayey silts. To evaluate the shear strength parameters mobilized during failure, drained soil shear tests were carried out on specimens taken from potential failure surface materials.
Based on the results of the back analysis performed for various conditions and using the field observations, actual failure surfaces were defined by successive slip surfaces developing from the toe and advancing to the crest of the slope. The analysis also indicated that the instability was initiated by the construction of steep and high benches in the transition zone deposits. It was further noted that there is a good agreement between the laboratory-derived residual shear strength parameters and the results of back analysis. The results of the stability analyses performed to determine safe side slopes in the transition zone are also presented.
๐ SIMILAR VOLUMES
Fifty-two patients with progressive resistant multiple myeloma were entered in this Southwest Oncology Group Phase II study, using weekly intravenous Aclacinomycin A. Of forty-three evaluable patients for response, there was one partial remission of 2 years duration and two sustained clinical improv
solid phase between the components under the experimental conditions investigated. The kinetic parameters associated with the bagasse/petroleum residue mixture involved the sum of bagasse and petroleum residue individual component kinetic parameters. The information obtained can be used to develoo
Carbon and Emery Counties contain the only coal mining regions in Utah. T h e age-and sex-adjusted incidence of gastric cancer in these 2 counties is 4 times that of the State of Utah. A detailed study of the patients with stomach cancer in the coal mining region revealed that 59% of male patients i