IS 19117 : 2025 Design and Construction of Combined Piled-Raft Foundations - Code of Practice
1 SCOPE
1.1 This standard covers the design and construction of combined piled raft foundation (CPRF) for residential, commercial, and industrial structures, tall structures, store houses, storage tanks, etc. CPRF transmits the load to soil by resistance developed by the components of the foundation, that is, piles and raft, the raft being placed on competent ground. The piles develop resistance along the pile shaft by skin friction and at the pile tip by end bearing. The raft develops the resistance by generating the contact pressure below the raft.
1.2 CPRF shall not be used in cases where soil layers of relatively low stiffness (for example, very soft cohesive soil, organic soil, collapsible soil, liquefiable soil) are situated closely beneath the raft. Provisions of this standard shall not be applicable to layered soil with significantly high stiffness (modulus) contrast between the top and bottom layers.
2 REFERENCES
The standards listed in Annex A contain provisions, which through references in this text constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of these standards.
| IS No. | Title |
| IS 456 : 2000 | Plain and reinforced concrete - Code of practice (fourth revision) |
| IS 1892 : 2021 | Subsurface investigation for foundations - Code of practice (second revision) |
| IS 2720 | (relevant Methods of test for soils parts) |
| IS 2911 | Design and construction of pile foundations - Code of practice: |
| (Part 1) | Concrete piles, |
| (Sec 1) : 2010 | Driven cast in-situ concrete piles (second revision) |
| (Sec 2) : 2010 | Bored cast in-situ concrete piles (second revision) |
| (Sec 3) : 2010 | Driven precast concrete piles (second revision) |
| (Sec 4) : 2010 | Precast concrete piles in prebored holes (first revision) |
| (Part 4) : 2013 | Load test on piles (second revision) |
| IS 2950 (Part 1) : 1981 | Code of practice for design and construction of raft foundations: Part 1 Design (second revision) |
| IS 6403 : 1981 | Code of practice for determination of bearing capacity of shallow foundations (first revision) |
| IS 8009 (Part 1) : 1976 | Code of practice for calculation of settlement of foundation: Part 1 Shallow foundation subjected to symmetrical static vertical loads |