Estimating Surface Settlements Due to Tunnel Works

[zaqqaz]

Hi,

I am using numerical modeling to estimate ground surface settlements due to tunnel works. I did the modeling in two stages. First, I used Mohr-Columb models to estimate the extents of the medium that is affected by tunnel works, which I assumed determines the disturbed soil region. Second, I replaced the disturbed soil regions with loose material (smaller elastic properties than the original material properties), and used elastic models to estimate the ground surface settlements.

I appreciate any suggestions about the validity of my approach.

 

[jdonville]

zaqqaz,

There is purpose-built software for this. There are experts in this field. If your project is critical, use them.

http://www.ggsd.com/

http://www.rocscience.com/

Jeff

 

[BigH]

Also - you might want to calibrate "your" modeling with the real work results of the work by Peck - who studied and reported this in great detail.

 

[zaqqaz]

Thanks for the responses.

BigH: Can you be more specific about Peck works, year, title, etc.

Thanks

 

[BigH]

The paper I remember is Peck, Ralph B, "Deep excavations and tunneling in soft ground," Proce. 7th Int'l Conf on Soil Mechanics and Foundation Engineering, Mexico City, State-of-the-Art Volume, pp 225-290. I believe that there is also something in Poulos and Davis' book on Elastic Solutions in Soil and Rock Mechanics (1975). If I can remember a few others, I will advise.

 

[Dirtguy4587]

I'm just curious - what type of tunneling method are you considering? I've done some work on settlement related to EPB TBM tunneling with precast concrete liners. the work I did basically showed that the majority of the settlement (i.e. >90%) occurred immediately behind the tail shield of the TBM. This was based on field observations and detailed surface and sub-surface settlement monitoring. I would be interested to hear how a numerical model would predict this type of ground movement.

 

[rconner]

Dirtguy4587, was just curious if any of the work you describe regarding tunnel settlement, it appears in some specific construction, was published (and of course if so where)? Sounds interesting - thanks for input.