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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...

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 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

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...

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...

This is a theoretical question but it is related to a potential problem with a deep outfall shaft which subject to large intermitant internal pressures. If I drill a borehole say 30m deep in sands and gravels overlain by boulder clay. Install a packer at the base of the borehole and expand the...

To highlight a cell by changing from black to red when daily level readings are plus or minus 5mm from the origional datum level.

I have specified an inclinometer to be installed in an embankment reservoir for monitoring lateral movement. The borehole for the inclinometer shows soft to firm clay (say 45kPa). I have asked the contractor to grout up the inclinometer with a bentonite / cement ratio of 2.5:1, which will be...

Heres the problem, I need to analyse the pressure capacity of a 4.5m diameter concrete shaft 30m deep- ie the shaft goes from ground level to 30m below ground level. The shaft acts as a pressure chamber in severe flood conditions as part of a storm water sewer system. Modifications to the sewer...

I have carried out a SeepW analysis for the rapid drawdown of an IR Dam. I now want to import that file into SlopeW to carry out a Stability analysis. Ive looked through the manuals which confirm this process can be done but does not explain how. Ive sent an email to GEO-SLOPE yesterday but...

I am using Plaxis V8.2 to analyse a concrete dam subject to earthquake loading. I need to input Rayleigh Beta and Alpha values. What I am looking for is a source of literature for these values. Any leads would be much appreciated. RGds, Rob.

We propose to excavate in microporous Loess soil around the city of Galati in Romania. The proposed structure is a combined sewage storage tank 25m diameter 15m below ground level. Does anyone have any experience in excavating in this type of soil and the associated geotechnical hazards. Also...

Calling all Plaxis users out there - is it possible to carry out a Dynamic analysis and a phi-c-reduction analysis at the same time. Im carrying out some psuedo static analyses of earth embankment reservoirs. Thanks, Kitch.

Im after the approximate relation between plasiticity index and angle of shear resistance of clays. I am aware of the table produced by Padfield and Mair - is their anything else. Regards, Rob K.

I am modelling a sheet pile excavation. How do I model a horizontal dislacment on the sheet pile?

I have PSD curves for a well graded glacial sands and gravels. I would like to estimate the permeability of the soil. I have tried using grading curves for using the uniformity coeficient and the D10 value. However they only seem suitable for uniform graded soils as does Hazens formula. Does...