Showing papers in "Engineering Geology in 1995"

TL;DR: In this paper, a range of both textural and mechanical data for a variety of rock types are given with some of the textural determination methodology and the results of drilling tests using polycrystalline diamond compact (pin and hybrid) and impregnated diamond core bits in the rocks are presented which demonstrate the influence of rock texture on drillability.

TL;DR: A 8.56-km long circular tunnel with a finished diameter of 4.75 m has been constructed for the Maneri hydel (hydroelectric) project on the River Bhagirthi as mentioned in this paper.

TL;DR: In this article, a study of the geotechnical characteristics of waste material from the Tertiary coal-bearing rocks derived from field and laboratory investigations, and describes the causes and mechanism of spoil instabilities which threaten the safety of the haul road and the agricultural areas in the vicinity of the pit.

TL;DR: In this paper, a geometric anisotropy factor (A f) of two-dimensional, natural fracture systems has been defined according to fracture spacing and orientation in a given direction.

TL;DR: In this paper, the authors quantify the transport in experimental catchment areas, and show that a forest cover can play a major role in preventing this type of phenomenon, leading to gravity instabilities in fresh marl and, much more frequently, in surficial weathered material.

TL;DR: For a critical project, where the consequences of failure are intolerable and protection is needed against the worst that can be reasonably expected to occur (the maximum credible earthquake), the deterministic method is strongly recommended.

TL;DR: In this article, the authors proposed a modification to the conventional oedometer on undisturbed sabkha specimens to consolidate specimens under a constant head to assess their compressibility and collapse potential.

TL;DR: In this article, the Onoda and Liniger concept of loose packing and dilatancy onset is applied to the formation of a deposit and its subsequent collapse, where the collapse of bridging structures allows a transition from loose random packing to close random packing.

TL;DR: In this paper, the authors proposed a visco-elastic model to predict the subsidence in Indian coal mines using the coal seam as a beam resting between viscoelastic media which deform due to transverse shear after mining.

TL;DR: In this article, an attempt is made to estimate the permeability tensor as well as the relation between permeability and depth on naturally jointed rocks, including effects of hydromechanical coupling, normal closure and fracture geometry.

TL;DR: In this article, a modified version of the NBRI Mortar-Bar Test for alkali reactivity is used for correlation with the quantitative parameters, and it is shown that the grain size reduction of quartz enhances reactivity by increasing the surface area of quartz grain boundaries available for reaction and thus giving an overall increase in surface energy.

TL;DR: In this article, a detailed investigation of the strength properties of Calico Hills tuff was undertaken to further characterize the behavior of this unit, and uniaxial compression tests on 43 specimens of massive and reworked tuff showed a dependence of peak strength and Young's modulus on the total porosity.

TL;DR: A detailed engineering geological assessment of low strength metamorphosed anisotropic rocks at an ongoing Hydroelectric Project in the Himalayan Region has been carried out as mentioned in this paper, which includes petrographic and petrofabric analyses of the rocks, geo-mechanical properties, rock stress measurements, rock mass classification using the Q-System and data concerning joint geometry, joint roughness and joint strength.

TL;DR: In this article, a logical and exact technique of counting lineaments on maps is presented, where lineaments are segmented and counted as frequency and length, and intersection of lineament to cell (LTC) and lineament-to-lineament (LTL) are given different weight scores on the basis of the pattern and symmetry of intersection with the counting cell.

TL;DR: Logic trees make sense when used in earthquake risk analysis where costs are compared for specific outcomes, but they fail in earthquake hazard analysis when they are used to develop earthquake ground motions for applications in engineering.

TL;DR: The origin of lateral ridge development in flow-like gravitational movements is controversial as mentioned in this paper, however, it has been shown that lateral ridges appear related to erosion of the pre-existing ground surface and that shear surfaces develop at both lateral and bottom boundaries of the moving masses.

TL;DR: In this paper, the authors examined the reasons for the allophanic soils exhibiting unusual shear strength properties in comparison to sedimentary clays and found that the surface charge properties of allophane particles imparts special engineering features to the volcanic ash soils.

TL;DR: In the case of the Chingaza tunnel, the majority of the fall-outs occurred in the Fomeque formation, which is dominated by black shales with interbedded layers of siltstone and some limestones as mentioned in this paper.

TL;DR: In this article, gravity, magnetic, and seismic surveys were conducted across the Wasatch fault zone east of Springville, Utah, near the mouth of Hobble Creek Canyon, and the geophysical data were acquired, processed, and interpreted to determine possible locations of larger [total offset greater than 6 ft (1.8 m)], shallow normal faults within the fault zone.

TL;DR: In this article, in-situ strength tests have been conducted on scree slopes in the southern French Alps to measure the strength of dry, coarse, matrixless debris, which can be characterized by its internal friction angle.

TL;DR: An area of a Tertiary and Cretaceous deposits, 100-310 m above sea level and on predominant 20-45°, highly dissected, concave slopes was investigated to assess its geotechnical characteristics and land use planning implications as discussed by the authors.

TL;DR: In this paper, the authors discuss in situ permeability testing performed at two sites in bore holes drilled in an extensive hydrogeological exploration program in Kuwait, which was undertaken to assist in the design and construction of a pilot drainage scheme aimed at lowering of the groundwater table in Kuwait City and suburbs.

TL;DR: In this article, a laboratory weathering test was carried out, in which twenty-five cylindrical specimens of biotite granite were immersed in 90°C water for 2000 days, and various measurements were made, in parallel, to investigate the long term changes in the specimens' physical properties such as permeability, porosity, longitudinal wave velocity and so on.

TL;DR: In this paper, an analytical formula for the estimation of bearing plate settlements under applied loads is offered for quasi-uniform soils and a new approach for the selection of allowable pressure values is proposed.

TL;DR: In this article, the geotechnical properties of selected marl soils obtained from different areas in eastern Saudi Arabia were evaluated under controlled conditions and subjected to different tests including CBR (soaked and unsoaked), triaxial compression, unconfined compression and one-dimensional compression tests.

TL;DR: The adobe reaction may be similar to the reactions involved in lime stabilisation of engineering soils as mentioned in this paper, and the reaction produced by the addition of siliceous material to Portland cement concrete.

TL;DR: In this paper, two types of fissured Neogene clays (SM and WB) were tested in the laboratory using undisturbed and reconstituted specimens, and the results showed that SM clays are more compact and less wet than WB clays.

TL;DR: The International Underground Congress Hall as discussed by the authors was constructed in Cappadocia, south of the town Avanos, and the geotechnical re-design of the structure was then accomplished through a series of numerical analyses carried out using a Boundary Element technique.

TL;DR: The consolidated properties of clay samples from sites on the inner shelf and Mediterranean coast of Israel (Acre, Haifa, Hadera, Ashdod and Ashkelon) are examined in this paper.