Showing papers in "Engineering Geology in 1979"

TL;DR: Chamberlain et al. as discussed by the authors found that freezing and thawing caused a reduction in void ratio and an increase in vertical permeability of four fine-grained soils, attributed to the formation of polygonal shrinkage cracks and/or to the reduction of the volume of fines in the pores of the coarse fraction.

TL;DR: In this article, the constitutive equation for creep deformation of frozen earth structures and the thermal calculations for predicting times to freeze a structure as well as estimating the energy and power required for different stages of freezing are presented.

TL;DR: In this paper, the authors used infinite slope analysis to determine the probability of underwater landslides on very low angle slopes (0.5°-1.7°) in the Mississippi prodelta area.

TL;DR: In this paper, the dynamic sediment budget on the intertidal face of sandy surf beaches is influenced by interaction of swash/backwash flows with the beach water table, where the water table height variations are coupled to tides and pass into the beach as a slow wave of diminishing amplitude and increasing lag.

TL;DR: In this article, a new rock durability classification, termed the Geodurability Classification, was proposed, which is based on different ranges of ratios of the uniaxial compressive strength, σc, and the “Duncan free swelling coefficient, eD, as index parameters.

TL;DR: Stoss and Valk as mentioned in this paper discussed the feasibility of ground freezing by direct gasification of liquid nitrogen (LN2) as an alternative to conventional freezing by circulation of liquid coolants.

TL;DR: Baker et al. as discussed by the authors used cylindrical specimens of fine Ottawa sand (A.S. designation C-109), compacted at the optimum moisture content and saturated before unidirectional freezing, have been tested in uniaxial compression at a cold room temperature of −5.5°C and strain rates between 10−7 and 10−2 s−1.

TL;DR: In this paper, the pore-water chemistry is reported for four sites in the Ottawa area and the roles of leaching and intense and mild weathering in influencing the geotechnical properties of these Postglacial marine clays are discussed.

TL;DR: In this article, a process of piston displacement of water through networks of micro-fissures provides a possible mechanism for downward percolation through the unsaturated Chalk, and the maintenance of continuous diffusion equilibrium between fissure and pore water throughout downward migration allows the explanation of the observed rates of movement for thermonuclear tritium.

TL;DR: In this paper, the authors describe some particular aspects connected with the swelling and shrinkage processes and their engineering effects in Romania, and the differences between swelling potential relationships, obtained by two different methods are presented and discussed.

TL;DR: In this article, the influence of salts in pore water in freezing soils is examined from the experimental viewpoint, using the differential scanning calorimetry technique for generation of multiple endotherms of the frozen test samples.

TL;DR: A previous study of microstructural changes in freezing clay suggested that a dispersed " freshwater clay should have a higher percentage of unfrozen water than a (leached) marine clay with simil... as mentioned in this paper.

TL;DR: The fabric and mineralogical composition of sensitive soils from widely separated parts of the world is qualitatively similar as mentioned in this paper, and the fabric is open but more complex than predicted theoretically, while primary minerals, particularly quartz and feldspar, form a higher than normal proportion of the soil's primary mineral grains.

TL;DR: A practical discussion of critical factors for designing and constructing temporary frozen earth ground support and groundwater control systems for large open excavations is reported in this paper, which can best be completed in a large open excavation, shaped to accommodate the subsurface structure.

TL;DR: In this article, three construction cases are presented using different methods as follows: Case 1: The top formation is penetrated using the ground-freezing method; the dry formation was penetrated conventionally; and the salt-water-bearing formation was used to prevent saltwater migration from the lower aquifer to the sweet-water aquifer.

TL;DR: The Baastad landslide occurred within a large area of marine clay deposits where the clay had been transformed into quick clay from leaching as mentioned in this paper, and three buildings were destroyed in the slide.

TL;DR: In this paper, sensitive clay from the Outardes 2 hydroelectric project is characterized and studied with respect to the effect of chemical changes on the development of the remoulded strength of the soil.

TL;DR: In this article, the authors summarize the engineering geology and geotechnical characteristics of sensitive clays found in the Ottawa-St. Lawrence Lowlands and discuss the problems of mass wastage in the form of flowslides and earthflows.

TL;DR: In this paper, in-service and laboratory stress-deformation data for silt and clay subgrade soils were obtained from in-situ tests and laboratory tests, for use in mechanistic models for design of pavements that will experience freezing and thawing.

TL;DR: Li et al. as discussed by the authors performed cyclic triaxial tests on frozen sand and found that Young's modulus increases with increasing frequency, confining pressure and sand content, but decreases with increasing strain and temperature.

TL;DR: Takagi et al. as discussed by the authors proposed a new freezing mechanism, called segregation freezing, to explain the generation of the suction force that draws pore water up to the freezing surface of a growing ice lens.

TL;DR: In this paper, the bearing capacity of cylindrical samples of frozen medium sand under constant uniaxial compression stress and under stepwise increased stresses is compared, and how to use these different creep curves to describe the stress-strain behaviour of frozen soils.

TL;DR: In this article, Jones et al. described the general design considerations involved in the ground freezing method and discussed the time required to achieve freezing in addition to the amount and rate of frost heave caused by the freezing.

TL;DR: In this article, the relationship between the rate of frost heaving and heat removal from the freezing front was examined under the following conditions: the temperature of the unfrozen part of a sample saturated with water was kept at nearly 0°C throughout an experiment.

TL;DR: In this article, the influence of overburden pressure on the relation between rate of heave and cold-side temperature was studied and the concept of a heaving zone was used to calculate the heave-decrease curve.

TL;DR: Radd et al. as discussed by the authors investigated the frozen state properties of several silty soils encountered in the construction of a large LNG storage cavern near Carlstadt, New Jersey, and correlated the creep and compression strengths with both field and laboratory-measured mechanical properties.

TL;DR: Menot et al. as discussed by the authors derived a system of nonlinear partial differential equations with a free surface; the unknowns are the temperature, the saturation degree and the water pressure at each point and at each time; these unknowns were coupled in the differential equations.

TL;DR: Zaretsky et al. as mentioned in this paper investigated the regularities of ice strain and failure under the conditions of short-time creep and found that the ultimate strength of ice signifying a maximum stress after which ice deforms plastically without passing into the stage of accelerated flow, is consistent with the stress under which the process of microcrack formation begins.

TL;DR: In this article, a moderately sensitive (20) Leda/Champlain clay from Gloucester, Ontario, was analyzed and the main constituents are primary minerals (quartz and feldspars) and an amorphous material, which are probably active cementing agents contributing to the undisturbed strength.