Showing papers in "Engineering Geology in 1998"

TL;DR: In this article, the water retention and swelling properties of the FoCa7 clay under controlled suction and zero applied stress were examined. But the results of the experiments were limited to the case of very high suction.

TL;DR: The use of ground granulated blast furnace slag (GGBS) is well established as a binder in many cement applications where it provides enhanced durability, including high resistance to chloride penetration, resistance to sulphate attack and protection against alkali silica reaction (ASR) as discussed by the authors.

TL;DR: A wide spectrum of slope failures have been noted in Hong Kong as mentioned in this paper, including small failures that collapse catastrophically without prior warning, due to their close proximity to buildings, however, small failures significantly outnumber large ones, and the scale of a failure event depends on the intensity, areal extent, position and duration of the triggering rainstorm.

TL;DR: Sand-and gravel-filled clastic dikes of seismic liquefaction origin occur throughout much of southern Indiana and Illinois as mentioned in this paper and nearly all of these dikes originated from prehistoric earthquakes centered in the study area.

TL;DR: In this paper, the discontinuous deformation analysis (DDA) is presented, including its variational principle, governing equations, solution techniques and contact representation and detection algorithms, and compared with the explicit distinct element method and the finite element method.

TL;DR: RFPA 2D as discussed by the authors is a linear and continuum mechanics method for numerically processing nonlinear and discontinuum mechanics problems in rock failure, which allows one to model the observed evolution of the progressive failure leading to collapse in brittle rocks.

TL;DR: In this paper, two samples of railroad aggregates were measured and sieved by hand, classified according to form and measured using image analysis, and a comparison was made between image analysis results, traditional sieve results and the actual hand measured size and form of each particle in the samples.

TL;DR: In this article, a numerical-cartographical method has been developed to create landslide hazard maps, which allows the assigning of a rating to the various parameters which contribute to landslides, such as erodibility and degradability of the rocks and Quaternary deposits.

TL;DR: In this paper, a method for the characterization of the fine fraction of natural and crushed aggregates, using image analysis, is presented, where the authors investigate the differences in particle shape and size distribution among a wide range of fine aggregate materials.

TL;DR: PCSTABL, a popular PC-based computer program for slope stability analysis is used in conjunction with the vertex method to analyze slopes in the present study and the presented methodology is shown to be effective in handling parameter uncertainty in the stability analysis of slopes.

TL;DR: In this article, a W-shaped anisotropy curve was obtained for Ranyah sandstone, due to the superimposed effects of the two directions of bedding and microfissures acting almost at right angles to each other, and is in line with Hoek and Brown's hypothesis for two mutually perpendicular discontinuities.

TL;DR: In this paper, a DDM (displacement discontinuity method) program coupled with a modified energy criterion is used to simulate the development of cracks and chips by indentation tools.

TL;DR: In this paper, the behavior of the expansive soil formations of eastern Saudi Arabia containing gypsum and anhydrite is discussed, and the potential hazards of local expansive soils are discussed.

TL;DR: In this paper, the Atterberg limits have been used to assess the effect of temperature on clays, and a new simple and rapid method was described by which such assessments can be made.

TL;DR: In this paper, a constitutive model that describes the relationship between the macro deformation of rock and the micro fracture within rock is developed, and the propagation of microcracks, the nonlinearity of deformation, the loading-and-unloading hysteresis and the variation of the apparent Young's modulus and Poisson's ratio are studied using the developed model.

TL;DR: In this article, a field experiment aimed at investigating particular features of recharge into its uppermost aquifer, that is, the First Sand Layer, has been recently performed, and some rebound in the recharged aquifer was recorded.

TL;DR: In this paper, field tests were conducted to determine the rock mass hydraulic conductivity through double packer constant pressure, rising and falling head tests in boreholes, and the field results indicated that the Bukit Timah granite is massive and has the hydraulic conductivities of 10 −10 -10 −10 −8 ǫm/s.

TL;DR: In this paper, a new computer code called the Interbed Drainage Package (IDP) was developed for the popular MODFLOW model to address this behaviour, which has been applied in a simulation of the port of Hangu and the results are being used to manage the land subsidence problem.

TL;DR: In this article, the temporal trend of displacement of a landslide on a low-gradient clay slope in the Italian Dolomites as a function of precipitation was simulated with a combined hydrological-slope stability model based on groundwater and surficial displacement observations.

TL;DR: A geotechnical testing program was carried out on undisturbed samples from Sultan Qaboos University staff housing areas where building damage had occurred, to evaluate mineralogical composition, cation content and swelling characteristics.

TL;DR: Subsidence investigations were conducted over three superimposed longwall panels in the Kamptee coalfield of Central India as mentioned in this paper, where the extracted contiguous seams were lying below a water bearing unconfined aquifer.

TL;DR: In this paper, a 3D finite element analysis was performed to simulate field tests at a pilot gas storage project, where the storage was a shallow rock cavern lined with a 6 mm thick steel liner.

TL;DR: Neural network systems have a great advantage in dealing with problems in which many factors influence the process and result, and the understanding of this process is poor, and there are experimen ...

TL;DR: In this article, two new quantitative indices are proposed to assess the orientation of aggregates of fine-grained soil, which include alignment entropy (Hm) and frequency distribution function of clay aggregate orientation Q(α).

TL;DR: In this paper, the authors proposed a specimen-separated strength parameter (σ) to express slope stability in the ground failure transmission stage, which is the most appropriate shear-strength parameter to express the slope stability.

TL;DR: In this article, aerial photogrammetry was used to study slopes with active production of materials through erosion, locations where eroded materials accumulate, and how the eroded materials are washed away by rainfall.

TL;DR: In this paper, a technique is proposed to determine whether a pre-existing plane of weakness will be reactivated by slip under a stress field, based on Coulomb-Navier criteria and the method of Yin and Ranalli (Yin, Z., Ranalli, G., 1992).

TL;DR: In this paper, the authors show that carbonate content and clay fraction activity have a great influence on the compaction characteristics of soils and that lower and upper Tortonian age (lower marls) are inadequate for use as subgrade because of their high plasticity.

TL;DR: In this article, the authors modeled the collapse and breakdown of coal seams in the coal seam in Northwestern Bohemia in the form of a fragmentary and blocky clay, and then deposited into large landfills >100m high.