Recent content by Ingseven

The way you describe the procedure (drilled shaft) plus the bearing capacity of "dense to very dense sand" supporting the shaft makes it unlikely that any load will be transfered to the tunnel if the shaft is 6ft appart. Do the math and confirm but I would not expect effects on the tunnel. Also...

I am not an expert in FEM, but shell elements would be reasonable. The boundary question is always there. The best way is to model the whole tube and you should avoid rotation by restraining the model. You don’t need to restrain in axial direction because the pressure is radial (if I...

I have noticed that there is a good approach utilizing the Dixon formula which use the E-modul and poissons ratio.

What if the self weight is not enough? In the case I presented it seems to be enough, but if the section is bigger (that could be the case) the uplift pressure would be more than the self weight. Thanks

Yes it is clear. But what could I use for friction between structure and soil, which will really avoid the structure from uplift.

Hi I have a structure 100ft deep into the ground, 9 ft square shape, and water is at 20 ft below surface. There is nothing inside the structure (only self weight). What would be the boundary conditions in the bottom if I want to calculate (Staad) buoyancy? I I considered it not supporte at the...

Hi, Can anybody give me some feed back regarding minimum ground cover in order to be able to perform jet grouting? Thanks

Hi, does anybody knows if there is a standard (and where is it) that mandates or at least recommends that the chainage/stations for a tunnel should be from left to right? Thanks

I am calculatin a schedule for a tunnelling sewer (10 ft). A maintenance shaft (70ft) will be augered vertical from surface installing a steel pipe direct into the sewer. I require som data about the advance rate of this procedure.

Hi, does any body know the average augering rate that can be achieved for a 3 m diameter shaft? tahnks

Hi, does somebody know a link with details of storm sewer connections between existing pipes and new pipes when they don't match exactly in length? Some kind of sleeve or similar. Thanks

Can anybody tell me the difference in using wire or rebars if the As is the same? Adventages and disad.? Thanks

Back to Mexico, it is really a different issue. Soft clay and many years of pumping. You won't have 6 to 7 ft settlement in your case where sand and silt are involved.

does any body has modelled (say FLAC) the way undrained clay shear strengths goes into to a drained behavior (parameters change). Any hint?

Thank you! You are right. But the article compares segmental rings (EPB TBM) and cut & cover pipes and not the differences in pipe loads when using EPB machines or machines without EPB.