## HI-Help with Rocscience Slide

## HI-Help with Rocscience Slide

(OP)

I am just learning slide--I have a slope with some water input below surface that is resulting in a combo slump and earth flow. Anyone have any pointers on how to enter the water aspect correctly into Rocscience's Slide program?

Thanks in advance!

J J Geotech

Thanks in advance!

J J Geotech

## RE: HI-Help with Rocscience Slide

## RE: HI-Help with Rocscience Slide

JJ Geotech

## RE: HI-Help with Rocscience Slide

When doing analysis for soils below water table, there is a option to include submerged unit weight. If its not selected the program assumes the total unit weight of soil. For pretty straight forward jobs like detention pond, it is professional practice to assume the submerged unit weight to be the total unit weight? Or should I make some kind of assumption for the unit weight based upon assumed specific gravity?

## RE: HI-Help with Rocscience Slide

Are you using slide? Because I think that the option Slide offers is to which layers are to be considered saturated based on input GWT and then the program will compute the submerged unit weight.

## RE: HI-Help with Rocscience Slide

how does slide calculate the saturated unit weight though? My understanding is that you have to either perform a specific gravity test, or make some kind of assumption regarding specific gravity right?

But what u said earlier about placing all layers below water table to be saturated..thats what I do. However, when I do use the saturated unit weight (which is higher), I typically get a lower F.S.

## RE: HI-Help with Rocscience Slide

You will get a lower factor of safety if the material exerting loads, lets say in the crest, is heavier.

## RE: HI-Help with Rocscience Slide

I am modellings a slope excavation of 50-55 m high for putting up a hydro powerhouse in river bed material/alluvium. To reduce the quantity excavation i am modeling a cut slope (1 h : 1.5 v)with a bench of 5.0 m in every 10.0 hight interval and providing some high strength soil nails to achieve the allowable FOS.

For silde input the parameter for soil nail required,

1. axial tensile strength kn

2. plate capacity Kn

3.Bond/ Pull out strength Kn/m

What is the correct estimate of plate capacity (2).

what is the allowable FOS for normal/seismic condition for global stability of slope.

And for that allaowable FOS one should assume the allowable tensile strength or yield strength of the bar/nail??

Can this type of excavation be modelled in SNail software.

Help me if any one has the answer.

Regards

Raj

## RE: HI-Help with Rocscience Slide

You should let a Geotech do the overall slope stability analysis