3. HYDROLOGICAL AND GEOTECHNICAL
HYDROLOGICAL
1) DISCHARGE (THUMB RULE, CATCHMENT VERIFICATION) AND INCREMENT
AS PER CATCHMENT AREA.
2) CONSTRICTED LINEAR WATERWAY.
3) FREEBOARD: CONSIDERED IN THE NEW HY DROLOGICAL GUIDELINE
4) MEAN PARTICLE SIZE (FROM GEOTECHNICAL REPORT).
GEOTECHNICAL
1) MEAN PARTICLE SIZE (EITHER CALCULATED AS IRC 5:2015 OR D50 OR
GEOTECHNICAL ER. JUDGEMENT WITH VALID REASON).
2) BEARING CAPACITY (WITH CONSIDERATION OF SCOUR LEVEL)
3) LIQUEFACTION OR ARTESIAN
4) LAB REPORTS
5. HORIZONTAL PILE CAPACITY/DEFLECTION
1) SOIL MODULUS OR SOIL STIFFNESS, KH (TABLE 3 IS 2911) BASED ON SPT
VALUE. AND STIFFNESS FACTOR, T (SAND/NORMALLY LOADED CLAYS) =
(EL/KH)1/5
2) PILE LENGTH IN SCOUR ZONE, L1. AND THEN L1/T AND THEN LF/T AS PER
FIGURE 4 OF IS 2911.
3) DEPTH OF FIXITY, LF
6. HORIZONTAL PILE CAPACITY/DEFLECTION
10) CONFINEMENT REBAR
LENGTH = 3 TIMES THE
DIAMETER OF PILE
4) FIXED HEAD PILE: STATIC HORIZONTAL
LOAD CAPACITY = 12EIY/(L1+LF)3 ;
WHERE Y IS THE PERMISSIBLE
DEFLECTION = 1% OF PILE DIA.
5) LENGTH OF EQUIVALENT CANTILEVER =
L1+LF
6) HORIZONTAL LOAD ON PILE = TOTAL
HORIZONTAL LOAD/NOS. OF PILE
7) FIXED END MOMENT IN PILE =
H*(L1+LF)/2
8) PERMANENT STEEL LINER AS PER CODE.
9) CURTAILMENT OF REBAR IN PILE:
DEPTH OF FIXITY (OR LENGTH OF
EQUIVALENT CANTILEVER) +
DEVELOPMENT LENGTH (X 1 OR X 2)
9. REBAR DETAILING:
CONFINEMENT REBAR
(PIER):
MIN. : 16MM DIA. REBAR @
100 C/C AT BOTTOM AND
16MM @ 150 C/C AT OTHER
PLACE
PILE:
10-12MM @ 80-100MM C/C
BEARING STOPPER:
18% OF VERTICAL LOAD
SHOULD BE CONSIDERED.
20-25MM DIA. REBAR @
100-150 MM C/C
11. PIER
CURTAILMENT OF REBAR:
CHAPTER: 17 OF IRC 112
WHERE LONGITUDINAL REINFORCEMENT IS
CURTAILED POTENTIAL OF FORMATION OF
HINGE SHALL BE AVOIDED JUST BEYOND
THE POINT OF CURTAILMENT. NOT MORE
THAN 1/3 OF LONGITUDINAL
REINFORCEMENT AVAILABLE AT THE
SECTION SHALL BE CURTAILED.
