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Thanks Mike, Can you give me the link that you used to find the BB equation. Regards, Rob.

Hi, Im writing a spread sheet to calculate immediate settlement using the Burland and Burbridge formula. However Ive come across a problem with the layer thickness correction factor, f1. The equation is as follows: f1 = H/z1.(2-H/z1) The problem is that when H/z1 > 2, you get a negative...

Thanks Jim, Another valuable post. Much appreciated. Ive pretty much designed the Navigation piles now and it is obvious they are going to require a fender of some sort to absorb some of the ships energy.

Thanks guys. Think Im getting there. I work as a consultant and there is no way I charge the client the time I spent researching this. Im almost there now but I'll be more careful accepting bespoke jobs next time.

Thanks Swearingen, Ive downloaded the catalog and had a quick look.........great information. Much appreciated

Thanks lads. I'll try both the Momentum and Kinetic Energy equations. Your responses are very much appreciated. Nam Myoho Renge Kyo.

Ciria Guide 103 Design of laterally loaded piles, will give you impirical equations to work out K value.

Hi, I’m designing some navigation piles (free ended single laterally loaded piles) to protect a water inlet structure for a water treatment works. The inlet is constructed on the River Thames (UK). The design impact load from a vessel on the river is 100 tonnes at 2.5 meters/second. However I’m...

Hi I’m designing some navigation piles (free ended, single laterally loaded piles) to protect a water inlet structure for a water treatment works. The inlet is constructed on the River Thames (UK). The design impact load from a vessel on the river is 100 tonnes at 2.5 meters/second. However I’m...

Hi Ive got the ship size and speed. 100 tonnes at 2.5 meters/second. However Im not quite sure to convert that into kN. Any ideas please.

Hi Im designing some navigation piles (free ended single laterally loaded piles) to protect a water inlet structure for a water treatment works. The inlet is constructed on the River Walton (UK). I need to know the magnitude of force that the navigation piles will be subject from a stray boat...

Im trying to find the empirical equations for base stability of excavations in soft clays, devised by 'O'Rourke from his 1992 publication 'Excavation and Support for the Urban Infrastructure'. Just want the equations not the paper. Thanks

Thanks BigH

Im trying to find a reference to this subject. Can any one point me in the right direction please.

Reinforced concrete CFA Piles have gone in for a structure. There is a problem. The debonding foam around the pile cap rebar has gone 600mm too far beyond the cut off level. Has any one had a similar experience before and if so you could you please tell me how you overcame it. We are...

I have been asked to review a proposed design to stabilise an embankment reservoir using sheet piles. The embankment is about 7m high with an upstream and downstream slope of about 26 degress. The embankment material is a soft to firm sandy clay. The crest of the embankment is about 7m wide...

A medium to coarse grained angular sand would compact if enough water were poured over it.

I am working on an combined foul and storm sewer outfall shaft that is subject to very large surge pressures (3.5Bar top to 6.5Bar at base). The shaft was constructed 40 years ago but since its construction the sewer network has greatly increased in size. In a storm event the surcharge within...

THanks fndn. I have concluded from the USACE publication "Design of Piling Foundations" that the effect of driving a pile results in increasing the K value, which has confirmed my assumption. It is now my intention to increase the K value of the Glacial sands and gravels by TaM grouting around...

There is not one piece of software on the market that will be able to design soil nails properly. Geotextiles maybe but not soil nails. The problem is that most software is plane frame 1.0m out of plane. For example when you draw a soil nail into the slope that you want to stabilise, the...