huangyhg

one lane vehicular tunnel under existing railroad tracks
anyone have example projects and/or design guide references or suggested methods of construction? it is through sandy clay type of material. the railroad has to be functional during construction of tunnel.
check out our whitepaper library.
jack casing, micro tunneling. what does the rr have o say abou methods
richard a. cornelius, p.e.
the rr has no jurisdiction in this case.
- construct a shoefly
- re-route the railroad to the shoefly
- construct the underpass using open cut method
- re-route back to railroad mainline
can't move the railroad. we have to do it with rr operational.
does the rr operate 24/7 ? is there some time when you could dig under the rr without a train going over it ?
no, it operates 24/7 for the delivery of coal.
good luck
you will have to tunnel as suggested earlier by dick. your best bet is to call in a boring contractor and discuss methods and issues with him to get a better feel. some of the issues that you need to start defining are:
1) allowable settlement of the tracks and monitoring requirements for it
2) action plan if the tracks do subside
3) how deep to groundwater?
4) type of tunnel to construct ie: concrete box, steel arch, shotcrete lined, other?
5) if you are in expansive clay, will your subgrade expand once you remove the load? if so, how will you mitigate the effect on the railroad above?
6) will grouting be require to stabilize the ground before tunneling? will grouting be required to fill voids behind the lining?
7) can you jack a culvert through the embankment instead of constructing a tunnel?
very good points cvq. thanks. the tracks can not be allowed to settle. groundwater not a problem. choice of tunnel type is wide open. no expansive clay. jacking a culvert may be possible if equipment is readily available. location is south america.
what will be using this tunnel? would it be cheaper to build a bridge?
richard a. cornelius, p.e.

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