Hydraulic Structures: Fourth Edition

3.2.3 Sliding stability Sliding stability is a function of loading pattern and of the resistance to translational displacement w ...

GRAVITY DAM ANALYSIS 137 inclusions, faults, etc., which may prove critical to foundation stability. The data in Table 3.4 is il ...

SLIDING FACTOR, FSS FSSis expressed as a function of the resistance to simple sliding over the plane considered. It is assumed t ...

GRAVITY DAM ANALYSIS 139 SHEAR FRICTION FACTOR, FSF FSFis defined as the ratio of the total resistance to shear and sliding whic ...

In some circumstances it may be appropriate to include downstream passive wedge resistance, Pp, as a further component of the to ...

GRAVITY DAM ANALYSIS 141 ofFSFrequired under alternative load combinations are summarized in Table 3.6 (USBR, 1987). Acceptance ...

Equation (3.30) can be developed further for application to multiple- plane sliding surfaces within a complex foundation (Corns, ...

GRAVITY DAM ANALYSIS 143 3.2.4 Stress analysis: gravity method Straight gravity dams are generally analysed by the gravity metho ...

A schematic illustration of the internal variation of these stresses on the basis of gravity method analysis is provided in Figs ...

GRAVITY DAM ANALYSIS 145 where∑Vis the resultant vertical load above the plane considered, exclus- ive of uplift, ∑M* is the sum ...

(b) Horizontal shear stresses Numerically equal and complementary horizontal (zy) and (yz) shear stresses are generated at any ...

GRAVITY DAM ANALYSIS 147 and for the minor principal stress,  3  z 2 y ^ max, (3.36b) where max z 2 y  2 ^2  ...

Horizontal cracking is sometimes assumed to occur at the upstream face if zu (computed without uplift) falls below a predetermi ...

GRAVITY DAM ANALYSIS 149 flare also serves to reduce any tensile stress which may generate at the downstream face under the rese ...

Single-stage design is based upon definition of a suitable and uniform downstream slope. The apex of the theoretical triangular ...

GRAVITY DAM ANALYSIS 151 at all node points. The approach is detailed in USBR (1976), but has now largely been displaced by more ...

3.2.9 Stabilizing and heightening A number of older gravity dams are underdesigned by present-day stand- ards, having undesirabl ...

GRAVITY DAM ANALYSIS 153 At suitable intervals along the crest holes are cored through the dam and into the foundation. Prestres ...

(b) Downstream supporting shoulder A supporting shoulder can be constructed, as shown in Fig. 3.11, employ- ing compacted earthf ...

BUTTRESS DAM ANALYSIS 155 The selection of compacted rockfill for the supporting shoulder offers the advantage, as opposed to ea ...