Soil Exploration | Civil Engineering SSC JE (Technical) - Civil Engineering (CE) PDF Download

Chapter 16 
Soil Exploration

SOIL SAMPLE AND SAMPLERS
The soil samples can be of two types: disturbed and undisturbed. A disturbed sample is that in which the natural structure of sols get partly or fully modified and destroyed, although with suitable precautions the natural water content may be preserved. Such a sample should, however, be representative of the natural soil by maintaining the original  proportional of the various soil particles intact.
An undisturbed sample is that in which the natural structure and properties remain preserved.

Soil Exploration | Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

(i) Inside Clearance
Soil Exploration | Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

1<Ci<3

(ii) Outside Clearance
Soil Exploration | Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

1<Co<2

(iii) Area Ratio (Ar)
Soil Exploration | Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
Ar < 20% for stiff formation,
Ar < 10% for soft clays

(iv) Recovery Ratio (Lr)
Soil Exploration | Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

Lr =1  Good recovery
L<1 Compressed
Lr <1  Swelled
where,
D3 = Inner dia of sampling tube
D4 = Outer dia of sampling tube
D1 = Inner dia of cutting tube
D2 = Outer dia of cutting tube

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FAQs on Soil Exploration - Civil Engineering SSC JE (Technical) - Civil Engineering (CE)

1. What is soil exploration?
Ans. Soil exploration refers to the process of investigating and studying the properties, composition, and behavior of soil in a specific area. It involves various techniques and methods to gather data and information about the soil, such as its physical characteristics, chemical composition, and geotechnical properties.
2. Why is soil exploration important?
Ans. Soil exploration is important for several reasons. Firstly, it helps engineers and geotechnical professionals understand the suitability of soil for construction projects, such as building foundations, roads, and dams. It provides crucial information regarding soil stability, bearing capacity, and potential risks like landslides or settlement. Additionally, soil exploration aids in determining the type of foundation required, assessing the potential for soil erosion, and identifying any contamination present in the soil.
3. What methods are used in soil exploration?
Ans. Various methods are employed in soil exploration, depending on the purpose and depth of investigation. Common techniques include soil boring, which involves drilling into the ground and extracting soil samples for analysis. Another method is the use of geophysical surveys, such as ground-penetrating radar or electrical resistivity, to assess soil characteristics without physically disturbing the ground. Other methods include cone penetration testing, soil sampling, and laboratory testing of soil samples.
4. How does soil exploration benefit construction projects?
Ans. Soil exploration plays a crucial role in construction projects by providing essential information for designing safe and cost-effective structures. By studying the soil properties, engineers can determine the appropriate foundation type, size, and depth to ensure stability and prevent structural failures. It helps identify potential risks and challenges in advance, allowing for proper mitigation measures to be implemented. Overall, soil exploration minimizes the risk of foundation settlement, slope instability, and other soil-related issues, thus ensuring the long-term integrity of the constructed facility.
5. What are the challenges in soil exploration?
Ans. Soil exploration can present several challenges. One common difficulty is accessing the subsurface layers of soil, especially in areas with hard or rocky terrain. In such cases, specialized equipment and drilling techniques may be required. Additionally, soil composition can vary significantly within a given area, making it necessary to conduct thorough investigations at multiple locations. Weather conditions can also impact soil exploration activities, as rain or extreme temperatures can affect the accuracy of results. Furthermore, the cost and time required for soil exploration can be substantial, particularly for large-scale projects.
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