AASHTO classification system — A classification system developed by the American Association of State Highway and Transportation Officials that rates soils relative to their suitability for…

# Posts published in “Geotechnical Engineering”

CIVIL ENGINEERS ARE IN THE MIDST of a construction revolution. Heavy structures are being located in areas formerly considered unsuitable from the standpoint of the supporting power of the underlying soils. Earth structures are contemplated that are of unprecedented height and size; soil systems must be offered to contain contaminants for time scales for which past experience is either inadequate or absent. Designs must be offered to defy the ravages of floods and earthquakes that so frequently visit major population centers.

All structures eventually transmit their loads into the ground. In some cases this may be accomplished only after circuitous transfers involving many component parts of a building; in other cases, such as highway pavements, contact is generally direct. Load transfer may be between soil and soil or, as in retaining walls, from soil through masonry to soil. Of fundamental importance is the response that can be expected due to the imposed loadings. It is within this framework that geotechnical engineering is defined as that phase of civil engineering that deals with the state of rest or motion of soil bodies under the action of force systems.

If only relationships (e.g., void ratio or unit weight) are given, the quantity of soil is indefinite and only other relationships can be calculated. Nevertheless,…

Example 15.4 Assume that a compaction mold having a volume of 1/30 ft3 was filled with moist soil. The total weight of the soil in…

Weight-volume problems may be divided into two categories: those where there is a defined quantity of soil, and those where the quantity of soil is not…

A soil sample has a total unit weight of 125 lb/ft3. It is desired to find its total unit weight in kN/m3 and its density in…

To facilitate working problems across different sets of units, it is convenient to express the unit weight and density of solids as a ratio to…

The term density is used herein to denote the mass-to-volume ratio of a material. However, some references, particularly older ones, use the term to describe…

The ratio of the weight of a material to its volume is its unit weight, sometimes termed specific weight or weight density. The unit weight…

The water content (or moisture content), denoted w, is the only relationship involving weights or masses. It is the ratio of the weight of water…

Volume relationships include the void ratio, the porosity, and the degree of saturation. The void ratio, denoted e, is the ratio of the volume of…