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The methods of site investigation are dependent upon ________
Climatic condition
Nature of engineering project
Local topography
All of the mentioned
Nature of engineering project
The primary objective of site investigation is to provide reliable subsurface data to support the structural design, hence the methods chosen are fundamentally dictated by the nature and scale of the engineering project. Different projects, such as a bridge foundation, a multi-story building, or an earthen dam, require varying levels of detail, depth of exploration, and types of geotechnical testing.
The primary objective of site investigation is to provide reliable subsurface data to support the structural design, hence the methods chosen are fundamentally dictated by the nature and scale of the engineering project. Different projects, such as a bridge foundation, a multi-story building, or an earthen dam, require varying levels of detail, depth of exploration, and types of geotechnical testing.
qult=cNc+qNq+0.5γBNγ — Ultimate bearing capacity equation requiring specific site parameters
σ=AP — Stress calculation defining load requirements for foundation design
Site investigation involves a systematic approach: Planning, Reconnaissance, Subsurface Exploration, and Laboratory Testing. The 'Nature of Engineering Project' dictates the intensity of this cycle. For heavy loads or sensitive structures, rigorous methods like deep boreholes, Standard Penetration Tests (SPT), or Cone Penetration Tests (CPT) are required to determine soil shear parameters (τ=c+σtanϕ). Conversely, minor structures may only require simple exploratory pits.
Investigation depth depends on the influence zone of the applied structural load.
The complexity of the site (geological features) complements the project requirements.
IS 1892 (Code of Practice for Subsurface Investigation for Foundations) provides guidelines for choosing the investigation method.
Minimizes structural risk through accurate soil parameter determination.
Prevents foundation failure and settlement issues.
High costs associated with detailed subsurface exploration.
Time-consuming process which may delay project commencement.
Foundation design for bridges and skyscrapers.
Slope stability analysis for highways and embankments.
Ground improvement strategies for weak soil.
While climatic conditions and local topography affect site access and feasibility, the technical requirements for soil strength and stability are determined by the specific engineering loads of the project.
Option D is incorrect because the 'nature of the engineering project' is the most critical factor that defines the scope and type of the investigation, superseding the others.
B is correct — The scope, depth, and intensity of soil investigation are determined primarily by the technical requirements and structural significance of the engineering project.
Always remember that in Civil Engineering, the depth of exploration must cover at least the 'significant depth' where the stress influence of the foundation exceeds 10% of the applied load.