Geotechnical Engineering

DHARM 780 GEOTECHNICAL ENGINEERING These values are set out in Table 19.2: Table 19.2 Values of Lacey’s silt factor (IS:3955-196 ...

DHARM CAISSONS AND WELL FOUNDATIONS 781 If inerodible stratum like rock is available at a shallow elevation, the foundation may ...

DHARM 782 GEOTECHNICAL ENGINEERING (8)Centrifugal Force: A centrifugal force is taken to be transmitted through the bear- ings i ...

DHARM CAISSONS AND WELL FOUNDATIONS 783 Sc = HC e oc o . () .log () 1 10 0 + 0 σσ+ σ ∆ ...(Eq. 7.14) where Sc = Consolidation se ...

DHARM 784 GEOTECHNICAL ENGINEERING Outer face Anchor Outer face Anchor (a) Sharp edge (b) Stub-nose Fig. 19.12 Different forms o ...

DHARM CAISSONS AND WELL FOUNDATIONS 785 ∴ P = N (sin cos)μθ θ+ Here N = vertical force on the curb θ = angle made by the bevel e ...

DHARM 786 GEOTECHNICAL ENGINEERING where q = Pressure at the base = Total weight Area of Plug r = radius of the imaginary invert ...

DHARM CAISSONS AND WELL FOUNDATIONS 787 This is nothing but Eq. 19.5 for Rectangular Caissons. The bottom is made bowl-shaped so ...

DHARM 788 GEOTECHNICAL ENGINEERING An inspection of Eq. 19.24 will reveal that, for a given value of skin friction, the thick- n ...

DHARM CAISSONS AND WELL FOUNDATIONS 789 If the width of the pier is greater than the size of the dredge hole, it is assumed that ...

DHARM 790 GEOTECHNICAL ENGINEERING The last three are the more important ones from the point of view of application. Of course, ...

DHARM CAISSONS AND WELL FOUNDATIONS 791 = 1 2 γ′DK()()pa−K D− 2 D 1 ...(Eq. 19.28) (Note: For convenience, the height to F is al ...

DHARM 792 GEOTECHNICAL ENGINEERING q¢max H D Scour line H 1 BC g¢D(K – K )pa Fig. 19.16 Heavy well The pressure distribution is ...

DHARM CAISSONS AND WELL FOUNDATIONS 793 Kp′ = K FS p .. In view of this, equations 19.28, 19.32, and 19.33 get modified with Kp′ ...

DHARM 794 GEOTECHNICAL ENGINEERING or x = 2 1/ 2 Q γ′KKLpa′ − L N M M O Q P ().P ...(Eq. 19.35) Taking moments about S, Mmax = Q ...

DHARM CAISSONS AND WELL FOUNDATIONS 795 m¢P m¢P Scour level D F w MB (a) Elevation p H (D–z)q z q sx (c) Deflection profile (d) ...

DHARM 796 GEOTECHNICAL ENGINEERING The moment of P about the base, Mp, is given by Mp = LDzdzx D z .(σ−) 0 = LmK z D D zv dz D z ...

DHARM CAISSONS AND WELL FOUNDATIONS 797 From equations 19.40 and 19.43, P = () () HWmKI. D + vv +′ βμ = βμμ θ 1 2 Using Eq. 19.4 ...

DHARM 798 GEOTECHNICAL ENGINEERING ∴σx ≤ pp or mK z D vF DZ K K zp a HG I KJ ()(−> −θγ ). At z = 0, the term mK D z D vθ()− i ...

DHARM CAISSONS AND WELL FOUNDATIONS 799 and R = B nD BnD (^22) B 1 4 2 2 22 2 F HG I KJ +=+() The above equation for Fn may be w ...