TIRUCHIRAPALLI - 621213.
QUESTION WITH ANSWERS
DEPARTMENT: CIVIL -IV
SUB.CODE/ NAME: CE 2033 / Ground Improvement Techniques
UNIT 1- INTRODUCTION
PART - A (2 marks)
1. What are the major problematic soils?
1. Collapsible soils
2. Liquefiable soils
3. Waste materials
4. Expansive and shrinkage
5. Marshy and soft soils
6. Karst deposits
2 . What is expansive soil? Give one example.
Expansive soils are soils that expand when water is added, and shrink when they dry out. This continuous
change in soil volume can because homes built on this soil to move unevenly and crack.
Ex. Deccan plateau and in some parts of Andhra Pradesh
Minimum volume like liquid limit is highest water content in the range of about 100 percent and the shrinkage
limit could be as low as 10 percent.
4. What is a collapsible soil?
These collapsible soils are nothing but the soils, which have a tendency to collapse upon loading. Many of the
reasons such as, the stable or unstable meta structure or capillary structures nullification are some of the
reasons for this collapsible nature of the soil. Suppose the soil is partly saturated and when it comes in contact
with water, the moment there is a contact with water all the capillary structures are destroyed. Because of this,
there is a volume change; it is in fact a reduction in volume and that leads to collapse.
5. What are the difficulties faced with soft clay?
When the soft soil is so poor, it is very difficult to construct anything, because the bearing capacity is very
low, shear strength is low, consolidation settlements are going to be very high and permeability is very low.
These are all very peculiar. So, this needs to be improved.
7. Name the various soil deposits found in India.
1. Black cotton soil
2. Laterites and murmurs
3. Alluvial soil
4. Desert soil
5. Boulder soil