2. Density The density of soil and rock materials is essential in understanding their load-bearing capabilities. Bulk density is defined as the mass of the soil or rock per unit volume, which includes both the solid particles and the void spaces between them. Specific gravity, on the other hand, is a measure of density relative to the density of water and reflects the inherent material properties. The relationship between moisture content and density is particularly significant. As water content increases, the density of the material changes, impacting its engineering behavior. Saturated soils will exhibit different properties compared to dry soils, highlighting the importance of considering environmental conditions in classification. 3. Moisture Content Moisture content is the amount of water contained in the soil or rock, expressed as a percentage of the dry mass. It is a critical factor influencing the behavior of both soils and rocks. In soils, moisture affects weight, cohesion, and plasticity. The Atterberg limits, critical for classifying fine-grained soils, define the boundaries of moisture content for various states: liquid, plastic, and shrinkage. In rocks, moisture plays a vital role in weathering processes and can impact the rock’s strength and durability. Saturated conditions may lead to changes in pore pressure, potentially causing instability, especially in cases where excavation or grading is being performed.

Covers strata mechanics, numerical methods in geomechanics, water jet cutting and mechanical disintegration of rocks. The preface discusses the option of describing typical interdisciplinarity of geosciences, dealing with the processes induced by human activities in geospere, by the word geonics.

Presenting current and emerging technologies in the field of mine planning and equipment, this volume also covers control and automation for surface and underground mining. A wide range of papers from professionals in Europe, South America, Africa and Australia are featured.

Includes various departmental reports and reports of commissions. Cf. Gregory. Serial publications of foreign governments, 1815-1931.

Reprint of the original, first published in 1866.