Showing papers in "Engineering Geology in 1989"

TL;DR: In this paper, the authors observed the formation of strike-slip faults and associated structures at two large landslides in central Utah during 1983-1985, and observed the creation and destruction of ephemeral structures as the landslide enlarged.

TL;DR: Sheet fractures are characterized by surface markings similar those formed during the brittle fracture of metals, glass and ceramics and those on joints in rock as discussed by the authors, and they tend to parallel preferred orientations of microcracks in many rock masses.

TL;DR: In this article, the authors studied the process of transformation of a single landslide into a cascade of damaging debris flows in the San Francisco Bay area during a severe rainstorm of January 3, 4 and 5, 1982.

TL;DR: In this paper, a triaxial strength equation is proposed as fitting the available laboratory triaxials test data, and the authors show how the unconfined compressive, tensile and shear strengths, coefficient of friction and exponent in the triaxially equation can be interrelated by three equations.

TL;DR: More than 220 large landslides along the bluffs bordering the Mississippi alluvial plain between Cairo, Ill., and Memphis, Tenn., are analyzed by discriminant analysis and multiple linear regression to determine the relative effects of slope height and steepness, stratigraphic variation, slope aspect, and proximity to the hypocenters of the 1811-12 New Madrid, Mo., earthquakes on the distribution of these landslides as discussed by the authors.

TL;DR: In this article, Graywacke samples from the Flagstaff Formation having a mean uniaxial compressive ( σm) strength of 185 MPa were subjected to cyclic load tests in order to investigate their fatigue and strain hardening behaviours.

TL;DR: In this article, a new composite liability index was developed and applied to 58 coals, enabling known dangerous and safe coals to be identified, and two existing composite indices were examined and found not to be totally applicable to the test programme.

TL;DR: In this paper, the role of bursting indices, in-situ approaches, geological features, mining conditions and observations in identifying the burst-prone mine workings is outlined and the development of an approach to define the rockburst-prone areas in mines is discussed.

TL;DR: In this paper, the performance of an instrumental rotary blasthole drill in a surface coal mine is evaluated by monitoring the parameters of instantaneous penetration rate, rotary speed, thrust, torque and flushing medium pressure.

TL;DR: In this article, a general frequency survey of all the causative factors was made to identify the factors exercising deleterious effects on roof stability, and multivariate statistical analyses were performed on the quantitative part of the data.

TL;DR: In this paper, the prediction of subsidence and displacements arising from longwall mining of steep seams is examined and various influence function methods and U.K. Subsidence Engineers' Handbook empirical design technique are compared for different mining conditions.

TL;DR: In this article, the geotechnical properties of the sabkha sediments and the potential engineering problems associated with them have been described, and the evidence of deterioration in construction materials arising from high evaporite content of windblown sands and Sabkha deposits is reported.

TL;DR: Theoretical analysis of viscous multilayers with free slip or bonding at layer contacts indicates that folds in such multilayer can be described in terms of three end-members: parallel, similar, and constrained.

TL;DR: In this paper, two kinematical models were introduced to bridge between geometrical and mechanical analyses, so results of the two methods of determining the deformations and geometry of bed-duplication folding can be compared.

TL;DR: In this article, a simple chemical test (methylene blue adsorption) has been used to assess the quality of basaltic tuff rock aggregate, which was used in the subbase of some highways in The Netherlands in which the pavement failed shortly after construction.

TL;DR: The Portuguese Bend landslide as mentioned in this paper is an active, slow-moving mass of blocks and debris that extends from the shoreline to moderate altitudes along part of the southerly margin of the Palos Verdes Hills.

TL;DR: In this article, two laterite soils, a granite gneiss derived and an amphibolite derived, are compacted at three different energies and subjected to consolidation and permeability tests.

TL;DR: Land subsidence caused by man-induced depressuring of underground reservoirs has occurred in at least nine urban areas in the United States, and significant efforts to control it have been made in three areas: Long Beach, California; Houston-Galveston, Texas; and Santa Clara Valley, California as mentioned in this paper.

TL;DR: In this paper, direct shear tests were run on samples of dry laterite sand and fine gravel laterite gravel reinforced with different types of fibres, including natural and synthetic fibres plus copper wires.

TL;DR: In this article, the Niger delta can be divided into three different zones, each with quite dissimilar stratigraphic and geotechnical characteristics: (i) sandy/clayey subsoil strata of the dry, flat plains; (ii) two-layer clay sand sequence of the fresh/salt water swamps; and (iii) three-layer, sand-clay-sand sequence of coastal beaches/ridges.

TL;DR: Corry et al. as mentioned in this paper interpreted the Climax-Alma stockworks of molybdenite veinlets as cupolas of leucocratic rhyolite-granite porphyry of Oligocene age.

TL;DR: In this article, a theoretical analysis of folding of viscous multilayers with different slip laws at layer contacts is presented, showing that the sense of asymmetry of folds is determined largely by the behavior of the layer contacts and a sense of layer-parallel shear during folding.

TL;DR: In this article, the authors discuss local practices and techniques used to improve some of the engineering properties of salina soil similar to that found in Saudi Arabia, and the best lime percent to improve the behaviour of fine desert salina was determined.

TL;DR: In this paper, a comprehensive study was undertaken to evaluate the geotechnical properties of natural fine-grained calcareous sediments in the Dammam-Dhahran area.

TL;DR: In this article, the effect of a change in moisture content from 3.7 to 12.0% on the stress-strain curves, strength at failure and Young's modulus was investigated.

TL;DR: Sensitivity and uncertainty analysis methods for computer models are being applied in performance assessment modeling in the geologic high-level radioactive-waste repository program as mentioned in this paper, where two basic approaches to sensitivity and uncertainty analyses: deterministic and statistical.

TL;DR: An evaluation of sliding frictional characteristics of several Indian rock types, varying widely in their geological mode of origin, but covering the different major geologic formations, that are of relevance to slope stability, is attempted by developing a tilting plane apparatus for laboratory studies as mentioned in this paper.

TL;DR: In this article, the average equilibrium voltage for the Fe3+/FeS2 system is 0.42 which corresponds to a Fe3 +: Fe2+ ratio of 10−6: 1.

TL;DR: In this paper, an explanation of the process of methane emission from coal and associated strata from the general viewpoint of recent British and Soviet physicochemical research, concerning the pore structure, sorptive capacity and sorption-kinetic properties of these materials, is attempted.

TL;DR: A computer method for the optimal solution of the generalized controlled flow problem in mine ventilation networks is described with emphasis on the case in which only quantities of some branches are known and the rest are to be determined.