The work shall consist of Construction of embankment and sub-grade with approved and specified materials obtained from approved borrow areas or suitable material obtained from roadway excavation and drain excavation and in accordance with clause 305.4.7 of MoRT&H specifications.
After completion of site clearance, Chainage boards and working bench mark shall be set outside the limits of construction areas.
The Contractor shall normally use the material from the specified borrow area. In case he desires to use different material for his own convenience, he shall have to carry out necessary soil investigations and redesign the high embankment at his own cost. The Contractor shall then furnish the soil test data and design of high embankment for approval of the Engineer.
Samples shall be collected from the identified borrow area & tested as per IS: 2720. On confirmation of suitability the area shall be properly demarcated.
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6.9 After completion of site clearance, the limits of embankment shall be marked by fixing pegs…
6.10 The original ground shall be leveled to facilitate placement of first layer of embankment…
6.11 Natural ground soil shall be tested for its suitability…
6.12 For construction adjacent to the existing embankment continues…
6.13 The embankment material shall then be spread in layers not exceeding 200 mm…
6.14 The compaction shall be done with Vibratory Roller of 8–10 Tons static weight…
6.15 Subsequent layers shall be placed only after the finished layer has been tested…
Minimum compaction for embankment layers is 95% and for sub-grade is 97% of modified proctor value.
| Test | Reference | Frequency |
|---|---|---|
| Sand Content / Gradation | IS:2720 (Pt 4) | 2 Tests / 3000 m³ |
| Atterberg Limits | IS:2720 (Pt 5) | 2 Tests / 3000 m³ |
| Modified Proctor Test | IS:2720 (Pt 8) | 2 Tests / 3000 m³ |
| Moisture Content | IS:2720 (Pt 2) | 1 Test / 250 m³ |
| CBR Test for Subgrade | IS:2720 (Pt 16) | 1 Test / 3000 m³ |
| Density of Compacted Layer | IS:2720 (Pt 28) | As per norms |
10.1 Adequate safety and traffic signs shall be installed…
10.2 Minimum of 2 flagmen shall be deployed…
10.3 Visible safety and road signs shall be provided…
10.4 No machines/equipment shall remain unattended…
10.5 Safety Officer shall make frequent patrols…
a. Nearby streams and water bodies shall be protected from contamination…
b. Vehicle tracks shall be kept moist to prevent dust…
