Tuesday, 31 May 2016

Stages of the sub-surface exploration


1. Reconnaissance

site Reconnaissance is the 1st step in the exploration. it include a visit to the site and to study the maps and other relevant records. it helps in deciding the future programme of the site investigation. types of sample adopted to be taken and the laboratory testing and in-situ testing.

2. Preliminary or general exploration

the aim of the general exploration is to get an approximate picture of the sub-soil condition at the relatively low cost. the information so obtained should suffice for the design and execution of minor and routing engineering works.

the preliminary exploration are generally in the form of few borings or test pits. test are conducted inthe form of the borings or test pits. test are conducted with cone penetrometers and sounding rods to obtain information about strength and compressibility of the soil

3. Detailed exploration

it is a supplement to general exploration when large engineering works, heavy loads and complex costly foundation are involved, such as bridge, dam, and multistory building. however for small projects especially at sites where the strata are uniform, detailed exploration may not be required.

the purpose of detailed exploration is to determine the engineering properties of the soils in different strata. it include the  extensive boring programme, sampling and testing of the samples in the a laboratory.

field test, vane shear test, plate load test and permeability test are conducted to determine the properties of the soil in natural state.

the test for the determination of the dynamic properties are also carried out.

 

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