Innovative Construction Practice and Quality Control Measure for Earth and Rockfil
Salma Dam Project, Afghanistan – A Case Study
This paper deals the related aspects with new innovative construction practice adapted and quality control measure for Earth and Rockfill dam of Salma comprises with clay core (centre in CoT) Filter F1 & F2 and blast rock mass as shell materials available near the dam site are found suitable and are being used in the main dam. The materials for horizontal filters (mixed filter), fine filters F1 and coarse filters F2 collected from Harirud river are screened in the screen plant and graded for their suitability as per designed criteria are being used in main dam in U/s, D/s dam. Part of Shell materials for the rockfill dam are collected from river bed and part from blasted rock materials from the parent rock mass nearby the dam. The physical properties of shell materials are found suitable. Nearly 17,27,108.59 lakhs cum. of materials (shell-14,47,733.60, clay -1,49,040.38 and filter-1,30,334.61 cu.m.) have been placed in the dam so far. For foundation rock of cut off trench (CoT) area was treated with consolidation grout holes and curtain grout holes at 3m c/c with varied grout pressure from of 1-22 kg/cm2. After the treatment, the post permeability tests were found below 5 lugeons.
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NBM&CW May 2011
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