Geotechnical Engineering

DHARM 760 GEOTECHNICAL ENGINEERING (a) Circular (b) Square (c) Rectangular (d) Octogonal (e) Twin-circular (f) Twin-rectangular ...

DHARM CAISSONS AND WELL FOUNDATIONS 761 19.2.3Allowable Bearing Pressure Caissons are carried to a hard stratum, such as compact ...

DHARM 762 GEOTECHNICAL ENGINEERING If it is desired to proportion a circular Caisson such that no ballast is required for sink- ...

DHARM CAISSONS AND WELL FOUNDATIONS 763 The perimeter shear stress may be calculated as follows: The force causing perimeter she ...

DHARM 764 GEOTECHNICAL ENGINEERING caisson has reached the desired location, a fairly thick concrete seal is provided. The thick ...

DHARM CAISSONS AND WELL FOUNDATIONS 765 Air lock Air release Compressed air Blow-out pipe Ladder Air shaft for men and material ...

DHARM 766 GEOTECHNICAL ENGINEERING (iv)Miscellaneous Equipment: Certain miscellaneous equipment such as motors, pres- sure pumps ...

DHARM CAISSONS AND WELL FOUNDATIONS 767 sinking at the desired location. Sand or gravel is invariably used as the ballast inside ...

DHARM 768 GEOTECHNICAL ENGINEERING where I = second moment of area of the plan of the caisson at the water surface, and V = Volu ...

DHARM CAISSONS AND WELL FOUNDATIONS 769 Sand fill Sandisland Dredge well Completed Caisson Fig. 19.6 Sand island method of placi ...

DHARM 770 GEOTECHNICAL ENGINEERING 19.6.2Construction of Pneumatic Caissons Pneumatic caissons may be constructed at the site or ...

DHARM CAISSONS AND WELL FOUNDATIONS 771 For equilibrium of the forces in the vertical direction, ΣV = 0 ∴ Superstructure load + ...

DHARM 772 GEOTECHNICAL ENGINEERING determine the minimum thickness of the seal required. Check for perimeter shear also. Assume ...

DHARM CAISSONS AND WELL FOUNDATIONS 773 Concrete seal 2 m H = 18 m 1 m 6 m 9 m Fig. 19.8 Concrete seal for open caisson (Ex. 19. ...

DHARM 774 GEOTECHNICAL ENGINEERING Ht. of centre of buoyancy, B, above the base AB= 545 2 . = 2.725 m AG is given as 4.200 m ∴ B ...

DHARM CAISSONS AND WELL FOUNDATIONS 775 After Installation Upward force on the Caisson = 9 × 18 × 9 × 10.2 kN = 14, 871.6 kN, Th ...

DHARM 776 GEOTECHNICAL ENGINEERING (ii) The depth can be decided as the sinking progresses, since the nature of the strata can b ...

DHARM CAISSONS AND WELL FOUNDATIONS 777 (i)Cutting Edge: The function of the cutting edge is to facilitate easy penetration or s ...

DHARM 778 GEOTECHNICAL ENGINEERING However, in terms of lateral stability, a square for rectangular section is better. Circular ...

DHARM CAISSONS AND WELL FOUNDATIONS 779 The area of cross-section of a well foundation is controlled not only by the allowable b ...