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Re: Soil Pressure

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not correct

Francisco Duarte wrote:
> Hi,
> I am working on a project for which I am designing a retaining wall. The
> report describe the loading as fallow:
> The basement wall should be design to resist a lateral earth pressure
> equivalent to a fluid weight of 35 pound per cubic foot , and an
> additional uniform pressure of 15H pound per square foot, where H= back
> fill height above the base of the basement wall footing in feet....
> Additionally the basement wall should be designed to resist lateral
> pressure induced by earthquake. An additional earthquake -induce
> pressure equivalent to a fluid weight of 20 pounds per cubic foot may be
> used in design. However, distribution of the lateral pressure should be
> taken as an "invert triangle " with its resultant force acting at a
> point two third of the wall height above the base of the wall.
>  Now I have tried to calculate the active overall presure and I came up
> with 75 psf(no including the 15H), which I think is to high and the
> soils engineer says there is something wrong in my calculations.  When I
> ask him/her to give me his calculated number, the only thing I recieved
> was a diagram in which he/she shows the 15H psf rectangle , 20H psf
> rectangle and a 15H psf triangle
> I guess I am missing something here.
> 1- Why can he/she give me a straight foward numerical answer?
> 2- What will the answer be for a  8 feet wall ?
> --
> Francisco Duarte
> Lea and Sung Engineering, Inc.
> Tel: 1-510-887-4086
> Fax: 1-510-887-3019