RETAINING WALL - TYPE HEIGHT OF THE WALL ABOVE THE GROUND LEVEL (m) - ADDITIONAL NOTES

Oct 24, 2026

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Engineering notes and typical drawing specifications for retaining wall construction, including general requirements for dimensions (in millimeters), materials and workmanship, porous backfill provision, weep hole spacing, and expansion joint intervals. Defines concrete grades for screed and foundations, random rubble masonry mix details, reinforcement bar requirements (high-yield deformed bars, lapping, bending, concrete cover), formwork finishes, and special ground bearing capacity checks. Provides tables and typical sections for R.R masonry toe walls and R/C wall heights with sheet references and scale.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages14

Reading Time35 min

AccessFree to download

General Notes

Concrete Grades and Masonry

Reinforcement and Formwork

Special Notes and Allowable Soil Capacity

R.R.T Toe Wall Table

Typical Sections and Wall Types

R/C Wall Height Examples

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GENERAL NOTES
(a) ALL DIMENSIONS ARE IN MILLIMETERS UNLESS OTHERWISE SPECIFIED
(b) ALL MATERIALS AND WORKMANSHIP ARE TO BE IN ACCORDANCE WITH REQUIREMENT OF THE SPECIFICATION
(c) POROUS BACKFILL TO BE PROVIDED ALONG THE ENTIRE LENGTH OF THE WALL AS INDICATED
(d) WEEP HOLES TO BE PROVIDED AT 1500m C/CSTRAGGERED USING 75mm DIA. PVC PIPES
(e) EXPANSION JOINT TO BE PROVIDED AT EVERY 5m INTERVAL USING THERMOFORM
CONCRETE

USE FOLLOWING CONCRETE GRADES FOR STRUCTURE OR PART OF A STRUCTURE MENTIONED BELOW WITH REQUIREMENT OF THE STANDARD SPECIFICATION (a) SCREED - GR. 15/40
(b) FOUNDATION BASE - GR. 20/20
R.R MASONARY
(a) RANDOM RUBBLE MASONRY USING 150-225mm (b) RUBBLE IN CEMENT SAND MORTAR 1.6 MIX RAINFORCEMENT
(a) ALL BARS MARKED "Y" SHALL BE HIGH YIELD DEFORMED BARS OF YIELD STRENGTH NOT LESS THAN 460N/mm2
(b) BARS OF CUT LENGTH LARGER THAN THE SUPPLIED LENGTH TO BE LAPPED WITH LENGTH OF 50Ø, WHERE Ø IS THE DIAMETER AND LAPPING SHOULD BE STRAGGERED
(c) REINFORCEMENT BARS SHALL BE BENT ACCORDANCE WITH STANDARD SPECIFICATIONS
(d) CLEAR CONCRETE COVER FOR ALL REINFORCEMENT TO BE 50mm
FORM WORK
(a) TYPE OF FORM WORK FOR FOUNDATION SLAB TO BE ROUGH FINISH.
(b) TYPE OF FORM WORK FOR SUB STRUCTURE TO BE SMOOTH FINISH.
SPECIAL NOTES
(a)ALLOWABLE BEARING CAPACITY OF THE GROUND AND THE PASSIVE EARTH HEIGHT SHALL BE CHECKED BY THE ENGINEER.
(b) R. R.T = RANDOM RUBBLE MASONARY TOE WALL.
75 500 700 1000 1000 1000 1000

1200 4000

RETAINNG
WALL
TYPE HEIGHT OF THE
WALL ABOVE THE GROUND LEVEL (m) ALLOWABLE BEARING STRENGTH OF SOIL SHOULD NOT BE
2 LESS THAN (KN/m) PASSIVE
EARTH
HEIGHT R.R.T-1 1.0 55.00 0.5 R.R.T-2 1.5 80.00 0.6 R.R.T-3 2.0 90.00 0.7 R.R.T-4 2.5 110.00 0.9 R.R.T-5 3.0 135.00 1.0 R.R.T-6 3.5 150.00 1.2 R.R.T-7 4.0 170.00 1.2 R.R.T-8 4.5 200.00 1.3
TYPICAL SECTION OF R.R MASONRY TOE WALLS Sheet No: 03 of 14
| | | | --- | --- | --- | | Employer
|
ROAD DEVELOPMENT AUTHORITY
PROJECT DIRECTOR
Local Bank Funded Project (LBFP)
Wing A ,8th floor, Sethsiripaya stage (II), Baththaramulla. | Project Title
Implementation of 100,000 km Alternative Road System as per the Government's Policy Statement
"Vistas of Prosperity and Splendour" | |

SCALE:- 1:25
TYPICAL SECTIONS OF R/C WALL HEIGHT
1.0m & 1.5m ABOVE GROUND LEVEL Sheet No: 05 of 14
CONC. GR 25
SCREED CON.
GR 15(40)
LOCATION MARK DIA.
(mm) TYPE CUT
LENGTH
(mm) S H A P E RETAINING WALL TYPE-1 01
02
03
04
05 12
10
10
10
10 Y
Y
Y
Y
Y 1780
YaULeV
YaULeV
2000
YaULeV

LOCATION MARK DIA.
(mm) TYPE CUT
LENGTH
(mm) S H A P E RETAINING WALL TYPE-2(II) 01
02
03
04
05
06 12
10
12
12
10
10 Y
Y
Y
Y
Y
Y 2300
2540
1400
1400
YaULeV 930 100
01

50
100

~~ ~~~~ ~~ 1100
SCREED CON.
GR 15(40)
LOCATION MARK DIA.
(mm) TYPE CUT
LENGTH
(mm) S H A P E RETAINING WALL TYPE-3(II) 01
02
03
04
05 12
12
12
12
10 Y
Y
Y
Y
Y 2850
3100
1850
1850
YaULeV
100 ~~ ~~
1250 YaULeV 05

25050 03 50250
02 25050 04 50250

~~ ~~300 1250
LOCATION MARK DIA.
(mm) TYPE CUT
LENGTH
(mm) S H A P E RETAINING WALL TYPE-4(II) 01
02
03
04
05 12
12
12
12
10 Y
Y
Y
Y
Y 3400
3650
2200
2200
YaULeV
100

300~~ ~~300 50 03 50

02

50
300
30050 04 50300
1500

SCREED CON.
GR 15(40)
450 1000
2000
2500
75 300 1500
350 450
400 450
300 450
1640
1640
2700
2700
2150
2140
3250
3250
1:12
1:12
1:12
1:12 | | | | --- | --- | --- | | Employer
| Engineer

ROAD DEVELOPMENT AUTHORITY
PROJECT DIRECTOR
Local Bank Funded Project (LBFP)
Wing A ,8th floor, Sethsiripaya

FAQs

What are the general requirements for dimensions and workmanship in these retaining wall drawings?

All dimensions are in millimeters unless otherwise specified. Materials and workmanship must comply with the requirements of the specification.

How are weep holes and expansion joints specified?

Weep holes are provided at 1500 m C/C, staggered using 75 mm diameter PVC pipes. Expansion joints are provided at every 5 m interval using thermoformed concrete.

What reinforcement and formwork requirements are stated for the construction?

Bars marked "Y" must be high yield deformed bars with yield strength not less than 460 N/mm², with lap lengths of 50Ø where applicable and clear concrete cover of 50 mm. Foundation slab formwork requires a rough finish, while sub-structure formwork requires a smooth finish.

Oct 24, 2026

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