WeightVolume Problems Involving Only Relationships
If only relationships (e.g., void ratio or unit weight) are given, the quantity of soil is indefinite and only other […]
WeightVolume Problems Involving Only Relationships Read Post »
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 […]
WeightVolume Problems Involving Only Relationships Read Post »
The water content (or moisture content), denoted w, is the only relationship involving weights or masses. It is the ratio
Weight-volume problems may be divided into two categories: those where there is a defined quantity of soil, and those where the
WeightVolume Problems Involving Defined Quantities of soil Read Post »
Volume relationships include the void ratio, the porosity, and the degree of saturation. The void ratio, denoted e, is the
The ratio of the weight of a material to its volume is its unit weight, sometimes termed specific weight or
The Unified Soil Classification System is based on the airfield classification system developed by A. Casagrande during World War II.
In a typical volume of soil the three components are arranged in a complex mixture. To visualize the relationships among the
The AASHTO system classifies soils into seven primary groups, named A-1 through A-7, based on their relative expected quality for
To facilitate working problems across different sets of units, it is convenient to express the unit weight and density of
Example 15.4 Assume that a compaction mold having a volume of 1/30 ft3 was filled with moist soil. The total