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A Short Course in Foundation Engineering by N.E. Simons and B.K. Menzies (Auth.)

By N.E. Simons and B.K. Menzies (Auth.)

Even though there are actually a good number of machine programmes for fixing every kind of origin layout difficulties, the necessity to fee those outputs by means of 'hand-calculation' has develop into very important. This publication concentrates on getting the basics correct after which utilizing them in sensible applications.

The publication is illustrated with a variety of labored examples and with quick-reference tables and charts

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Sample text

This is satisfactory. 58 Width of foundation (B) not less than 1 m. 0X100 These values are based on the assumption that the foundations are carried down to unweathered rock The resistance to sliding along the base may be assessed as follows, neglecting the passive resistance of the soil which may be affected by softening, etc. 75 times the undrained shear strength. For further discussion on adhesion between clay and concrete, see Chapter 6. Factor of safety against sliding = 150/75 = 2. This is satisfactory.

E. 5) elastic solid and a loaded end of construction saturated clay. 5 and Eu is the modulus determined from undrained triaxial tests. 6. The chart provides estimates of the average immediate settlement of uniformly loaded, flexible areas of strip, either rectangular or circular in shape. 4) putting Iu = μ 0 μ^ Generally, real soil profiles which are deposited naturally consist of layers of soils of different properties underlain ultimately by a hard stratum. Within these layers, strength and moduli generally increase with depth.

No thorough study of this aspect has been made to date but it is apparent that the greater the elapsed time, for a stiff, fissured clay, the smaller is the measured strength. 5 hour after excava­ tion. Other evidence was provided by laboratory tests on 38 mm diameter specimens cut from block samples of fissured clay from Wraysbury, which were stored for different periods before testing. Strengths of specimens cut from blocks stored for about 150 days before testing were only about 75% of the strengths of specimens prepared from blocks within 5 days of excavation from the shaft.

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