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Thanks miningman, no negative feeling here on my side, I am glad to have your advice, They considered to push through with the method, These is really my first time to work with these huge size of tunnel, I had work on HATS 2 in Hongkong and had huge volume of water as grouting engineer but we...

Mode of excavation is now being reconsidered, The main point that i'm asking is with the given size of tunnel and mode of excavation, how many probhole is needed to drill and what is the water inflow limit that is considered to do pre excavation grouting and or when to say Pre excavation...

The Mode of support shall be a Rib Reinforced shotcrete at 1m distance with canopy pipe on the crown, the excavation shall be done by NATM, my question is the critical water inflow that shall be considered for Pre-excavation grouting be done before advance.

Any body who is envolved in tunneling worsk, my question lies in water inflow criteris; what is the best limit of water inflow to execute grouting works in soft ground using canopy pipes... consider big section of tunnel say 16m x 20m... Thanks in advance.

Check your contract and responsibilities, You were hired with out license in the first place and giving more coverage and responsibility (by sealing should have change). You should not seal as there is chain of command and responsibility, sealing is approval too in the first place, someone must...

Thanks to all input, i have learned much points. We will check the acidity of the ground and check factories for any availlable local materials for that purpose. Thank you verry much.

Hello to all, We will soon be constructing a foundation on a deep area with suspected acidic soil, One member of the team suggested painting with local enamel primer paint, any comment or suggestion on this matter.Thanks Ace

The area was once a river and the deepth of the sands, silt and soil was too thick. Soil test was done to 40m deepth and no change on soil parameters. The result of the test suggested floating foundation but time consuming even on paper works only(Lisemsing, permits,limmited working hours, etc)...

PRV, Pressure release valve.... know the pipe capacity and set the valve

minutes and seconds,,..... angles my friend.... positive mean the quadrant

Do some visiting on the field, now a day different tools and equipment that are coming out. Many books and manuals are far verry high on its factor of safety that makes your estimates verry high, you are new in the field so site visiting and self education is the best and make your own manual...