Soil Treatment for Peaty Clay

[CCLow]

An area with top layer of peaty clay. This area is proposed to use as a waterway drains with recreaction water acitivies. Proposal are to treat the peaty clay with deep soil mixing method to prevent slip failure at side slopes. Any better method to treat the soil ?

 

[fattdad]

You could consider a surcharge.

Then again, I may not fully understand the problem. Is this a clay layer that you will excavate to form a new slope grade? Do you have any existing strength data, Atterberg limits (wet prep AND oven dry prep) or percent passing 200 data? Not sure how you could design a soil-mixing solution without some basic soil strength data.

f-d

¡papá gordo ain’t no madre flaca!

 

[CCLow]

The SPT value for the peaty clay is 2 to 5. This layer could go from top to 5 m deep. The u shape waterway ( vary from 11 m to 16 m wide)'s bottom level is about the same level and will be form within this peaty clay layer with reinforced concrete base slab and walls. 5 m away on both sides of the walls, there will be deep soil mixing(using cement) to treat the soil. The 850 dia ring forms deep soil treatment (overlapping) will run about 20 m deep forming 2 rows of "barrack" walls to prevent slope failure. Surcharging seem to be inappropriate. Tks

 

[fattdad]

But do you have soil data on the peaty clay?

f-d

¡papá gordo ain’t no madre flaca!

 

[BigH]

Tax money at work - huge investments for ? . . . Why the need for concrete walls, etc. Why a "U" shape - why not just a trapezoidal shape with flat slide slopes? You have a project with extensive problems and expensive solutions. Countries such as Indonesia have extensive agricultural irrigation in poor soils and I don't ever remember seeing concrete walls, soil mixing, etc. Sorry - I guess that "Obama-nomics" is getting to me . . .

 

[CCLow]

Tks for your simple solution which I and many others are awared. You had not solved the problem but change the desgin. I think we keep it professional and within engineering to resolve the engineering problem. Not a good idea to bring in social, economic and politic into the pictures.Tks anyway for being emotional.

 

[Zambo]

CC Low, I guess you're in Malaysia or nearby (Singapore?). Are these jet grout columns? If so I think if the design "works" it could be cost effective at a depth of 20m. Other solutions would be diaphragm walls or secant piles.

 

[CCLow]

HI, These are not jet columns. As mentioned, there are Deep soil mixed columns. Heavy engineering like diaphragm, secant piles? Give them a miss. Get back to basic and go green! I will not ask for opinion if the option are diaphragm, secant piles. Anyway to treat the soil in order to strengthen?