The raft foundation design with step wise procedure are as given: As per IS 1893: 1 Cl 6.3.5.2 allowable bearing pressure in soil can be increased depending upon type of foundation thus bearing capacity of soil is increased by 50% assuming it will be Raft foundation. The gross pressure due to dead and live loads of the structure and weight of the raft is 130 kPa Bearing Capacity of Shallow Foundations (16 pages) 6.1 Introduction 6.2 The Bearing Capacity Formula 6.3 The Factor of Safety 6.4 Inclined and Eccentric Loads 6.5 Inclination and Shape factors 6.6 Overturning 6.7 Sliding 6.8 Combined Calculation of a Wall and Footing 6.9 Numerical Example 6.10 Words of Caution ... Is it normal to have a bearing capacity of 6,7 MPa for a raft foundation of 118,3X62,7 m ? 6. I don't have a problem with bearing capacity calculation (i calculate it for all four boreholes and consider the most unfavorable condition. Soil Tests for Shallow and Raft Foundations Soil tests required to determine safe bearing capacity of shallow foundations and raft foundations are discussed here. The piled raft foundation for … Isolated Footing 2. (KN/m3 units) This is for modelling a raft foundation . Requirement: Determine allowable soil bearing capacity using Terzaghi’s equation. CE 366 – BEARING CAPACITY (Problems & Solutions) P1 Question: An excavation will be made for a ten storey 15x25 m building. = )( ∅(0.34) ′ 11.12.2.1.c Where, U … The weight of the raft is not considered in the structural design because it is assumed to be carried directly by the subsoil. For rafts on clay, the factor of safety should not be less that 3 under dead load and maximum live load. Pile Footing 59 (2) Tolerable settlements, the bearing capacity must be low enough to ensure that both total and differential settlements of all foundations under the planned structure are within the allowable values, (3) Safety against failure, this failure is of two kinds: • the structural failure of the foundation; which may be occur if the foundation Features of Raft foundation. Module 4 : Design of Shallow Foundations Lecture 17 : Bearing capacity [ Section17.1 : Introduction ] 17. November 23, 2014 Example 4-2. Important buildings such as nuclear power plants always require stricter control of differential settlement than ordinary buildings. They are also used in case the soil has high bearing capacity. The maximum ultimate column load will be used in the calculation. Vertical Stress Increase in a Soil Mass Caused by Foundation Load Stress Due … Such foundations are used for structures that do not carry much load. Elastic Settlement Calculation (Main topic of this chapter). Raft foundation is a type of shallow foundation that is mostly used on soils of low bearing capacity, where the foundation pressures need to be spread over a large area.They are also used in areas where the foundation soils are of varying compressibility and the foundation has to bridge over them. To get a better idea about when to use raft foundation, it is important to understand how raft foundation works. Recommended Jobs. The subsoil layer of the earth, which does not have adequate bearing capacity is excavated for the construction of the Raft foundation. Raft foundation is also known as a Mat foundation. The selection of the type of raft foundation depends on a variety of factors like bearing capacity… Foundation Engineering Allowable Bearing Capacity and Settlement 2. Solution: From Table 1 or Figure 1, Nc = 37.2, Nq = 22.5, Nr = 19.7 for φ = 30 degree Determine ultimate soil bearing capacity using Terzaghi’s bearing capacity equation for strip footing Qu = c Nc + γ D Nq + 0.5 γ B Nγ = 0 +100*2*22.5+0.5*100*6*19.7 Bearing capacity of soil is the value of the average contact pressure between the foundation and the soil which will produce shear failure in the soil.Ultimate bearing capacity is the theoretical maximum pressure which can be supported without failure.Allowable bearing capacity is what is used in geotechnical design, and is the ultimate bearing capacity divided by a factor of safety.
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