వివిధ మట్టలలోని ట్రాన్స్‌మిషన్ టావర్ల ఫౌండేషన్ల డిజైన్

1

In good soil (silty sand mixed with clay)

Normal Dry

2

Where top layer of Black Cotton soil extends upto 50% of the depth with good soil there after.

Partial Black Cotton

3

Where top layer of black cotton soil exceeds 50% and extends upto full depth or is followed by good soil.

Black Cotton

4

Where top layer is good soil upto 50% of the depth but the lower layer is a black cotton soil

Black Cotton

5

Where subsoil water is met at 1.5 ml or more below the ground level in good soil

Wet

6

Good soil locations which are in surface water for long period with water penetration not exceeding 1.0 m below ground level (e.g. paddy fields).

Wet

7

In good soil where subsoil water is encountered between 0.75m and 1.5m depth from ground level.

Partially submerged

8

In good soil where subsoil water is encountered within 0.75m depth from ground level

Fully Submerged

9

Where top layer of normal dry soil extends upto 85% of the depth followed by fissured rock without presence of water.

Dry Fissured Rock

10

Where top layer is lissured rock followed by good soil/sandy soil with/without presence of water

Special foundation

11

Where normal soil/tissured rock extends upto 85% of the depth followed by hard rock

Dry fissured Rock with under cut in Fisured Rock combined with anchor bar for hard rock design

12

Where fissure rock os encountered with subsoil water within 0.75m or below 0.75m from G.L. (Top layer may be either a good soil or black cotton soil)

Submerged Fissured Rock

13

Where Hard Rock is encountered at 1.5 m or less below ground level.

Hard Rock

14

Where Hard Rock is encountered from 1.5 m to 2.5m below G.L. (Top layer being good soil)

with chimney for Normal Soil Hard Rock Foundation

15

Where hard rock is encountered from 1.5m to 2.5 m below G./L. (Top layer either in Black cotton) soil or fissured Rock

Hard Rock Foundation design with chimneys designed for wet black cotton soil.

16

Where fissured rock is encountered at the bottom of pit (with black cotton soil at top)

Composite Foundation

17

Where hard rock is encountered at bottom with water and black cotton soil at top and hard rock layer depth is less than 1.5 m.

Hard Rock

18

Sandy soil with clay content not exceeding 10%

Dry Sandy soil

foudation

19

Sandy soil with water table in the pits

Wet sandy soil design to be developed considering the depth of water

20

Where top layer upto 1.5 m below G.L. is normal dry soil and thereafter hard soil/murrum

Normal dry with undercut

21

Where bottom layer is marshy soil with top layer of good soil/fissured rock/black cotton

Soil investigation is to be carried out and special foundation design to be developed.

22

Where the top layers are a combination of clinker mixed with firm soil, gravel and stone chips upto 60% of foundation deapth from ground level followed by hard murrum

Normal dry with undercut

23

Where top layers are combination of hard murrum, soft rock etc. followed by yellow/black clayee soil

Special foundation design is to be developed after carrying out soil investigation.