Manual of Soil Laboratory Testing: Effective Stress Tests by K. H. Head, Roger Epps

By K. H. Head, Roger Epps

This quantity offers a entire operating guide for the laboratory trying out of soils for civil engineers. it truly is an important functional instruction manual for all who're engaged in laboratory trying out of soils in addition to being of significant worth to specialist engineers, experts, teachers and scholars in geotechnical engineering. Revised and up to date, the contents reflect present perform in average laboratory try out systems for deciding on a few of the very important engineering houses of soils.

The authors have had a long time adventure in dealing with huge soil trying out laboratories because the early Nineteen Fifties via to the current day, while actively contributing to the improvement of geotechnical trying out via education classes, lectures, committees and dealing teams. They know that it really is relatively very important for try tips on how to be totally understood and a step by step method has for this reason been utilized in providing every one section.

The try methods contain the size of soil permeability, CBR worth, tired and undrained shear energy, and consolidation features. extra fabric during this new version contains the autumn cone process for size of shear power in clays in accordance with the ecu Technical Specification, a simplified direct technique and an invaluable association for using pressures in multistage triaxial exams to satisfy the necessities of BS1377. the most recent necessities for calibration of apparatus and measuring units are offered and mentioned, including the importance of caliber insurance in line with known laboratory accreditation to ISO/IEC 17025.

Descriptions of try equipment are complemented by way of many numerical examples to be able to illustrate the tools for recording try information, making calculations, providing graphical plots and deriving attempt effects. basic ideas are defined, the place applicable, in order that the operator could have a greater realizing of the importance of the checks and advice is given the place adventure has proven that problems might be encountered. the significance of fine strategies, crucial assessments on attempt apparatus and laboratory safeguard are all emphasised.

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Manual of Soil Laboratory Testing: Effective Stress Tests III

This quantity presents a entire operating guide for the laboratory checking out of soils for civil engineers. it really is a necessary sensible instruction manual for all who're engaged in laboratory checking out of soils in addition to being of significant worth to specialist engineers, specialists, lecturers and scholars in geotechnical engineering.

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Example text

50 Effective stress testing principles: theory and applications Time required When pressurised air-free water is introduced into the void spaces in a specimen there is an immediate increase in the degree of saturation due to the compression of air in accordance with Boyle’s law. If the pressure is maintained the degree of saturation increases further as air dissolves in the water, but this process takes time owing to the slow rate of diffusion of small bubbles of air in confined spaces. The time element here is governed by diffusion, not by the effect of low soil permeability.

1. Air in the void spaces within the specimen is forced into solution under the applied pressure when full saturation is reached. There is then no separate air phase in the voids which might otherwise give erroneous pore pressure measurements. 2. Any air trapped between the membrane and the specimen is also dissolved. 3. In a specimen that dilates during shear, water can be freely sucked in during a drained test without the movement being impeded by an airlock due to air bubbles. 4. For a similar specimen in an undrained test, initial application of a high enough back pressure can prevent the pore pressure falling below atmospheric as it tries to dilate, and therefore the measured pressure remains positive.

Values correspond to those in Table 1 of BS 1377 : Part 8 : 1990. Time to failure in undrained tests Guidance on the time required to failure in undrained tests, based on 95% pore pressure equalisation within the specimen, was given by Blight (1964). The relation between tf and cvi depends on whether or not side drains are fitted. 5, λ = r2/4 for drainage from one end. 508t100 4 For tests with side drains and drainage from the radial boundary only in the consolidation stage, the corresponding relationships are as follows.

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