🕑 Reading time: 1 minuteSoil investigation and soil explorations are conducted for the purpose of site investigation to get clear information about the soil properties and hydrological conditions at the site.
Site ReconnaissanceSite reconnaissance is the inspection of the site and study of topography to get a proper information about the soil and groundwater condition.
Purpose of Soil ExplorationThe purpose of site exploration is to get detailed information about
- Order of occurrences and extent of soil and rock strata.
- Nature and engineering properties of of the soil and rock formation.
- Location of groundwater and its variation.
Planning of Soil ExplorationSoil exploration planning depends upon
- Nature of subsoil
- Type of structure
- Importance of structure
Methods of Soil ExplorationDifferent methods of soil exploration for study of soil profiles are:
- Open excavation
- Subsurface soundings
- Geographical methods
1. Open ExcavationA pit, eventually, can be excavated for exploring shallower depths, say of the order of 2 to 5 m, or so. Such a pit can be easily excavated at the proposed construction site, if the soil has a bit of cohesion, and the soil samples can be lifted from such different depths, besides making the easy visualization and examination of the different strata. Even undisturbed soil samples can be lifted from such a pit by a process called chunk sampling.
2. Boring MethodSoil samples can be lifted from deeper depths by drilling bore holes by using mechanical devices called samplers. The process consists of
- Drilling a hole and visually examining the cuttings coming out from different depths
- Lifting the soil samples from different depths by using mechanical devices called samplers.