Tunneling for underground power and pipelines

1. A tunnel boring machine, comprising:

a propulsion system;

a torch support structure carried by the propulsion system, including:

a disc mounted on a rotatable shaft; and

at least one partial disc spaced apart from the disc and mounted on the rotatable shaft; and

a plurality of plasma torches carried by the torch support structure, wherein at least selected ones of the plurality of plasma torches are mounted to the disc and at least selected other ones of the plurality of plasma torches are mounted to the at least one partial disc.

2. The tunnel boring machine of claim 1 , wherein the plurality of plasma torches are arranged on the torch support structure in a spiral pattern.

3. The tunnel boring machine of claim 1 , wherein the plurality of plasma torches are arranged on the torch support structure in a Fibonacci spiral.

4. The tunnel boring machine of claim 1 , further comprising a laser positioned proximate the center of the disc.

5. The tunnel boring machine of claim 1 , wherein at least selected ones of the plurality of plasma torches comprise non-transferred arc plasma torches.

6. The tunnel boring machine of claim 1 , wherein at least selected ones of the plurality of plasma torches comprise transferred arc plasma torches.

7. A tunnel boring machine, comprising:

a propulsion system;

an enclosure carried by the propulsion system;

a torch support structure carried by the enclosure, wherein the torch support structure comprises a primary disc mounted on a rotatable shaft carried by the enclosure;

a first plurality of plasma torches mounted to the primary disc;

a power supply cable coupled to the enclosure and adapted to supply power to the boring machine from one or more power sources; and

a control system configured to select the one or more power sources from among multiple available power sources based on a corresponding cost and a corresponding availability of each of the multiple available power sources.

8. The tunnel boring machine of claim 7 , wherein the multiple available power sources comprise at least two of solar power, wind power, geothermal power, hydro power, tidal power, wave power, power derived from biofuel, or power derived from fossil fuel.

9. The tunnel boring machine of claim 7 , further comprising a laser positioned proximate the center of the disc.

10. The tunnel boring machine of claim 7 , wherein at least selected ones of the plurality of plasma torches comprise non-transferred arc plasma torches.

11. The tunnel boring machine of claim 7 , wherein at least selected ones of the plurality of plasma torches comprise transferred arc plasma torches.

12. A tunnel boring system, comprising:

a first tunnel boring machine, comprising:

a first propulsion system;

a first enclosure carried by the first propulsion system;

a first torch support structure carried by the first enclosure, wherein the first torch support structure comprises a first disc mounted on a first rotatable shaft carried by the first enclosure, and wherein the first disc has a first diameter; and

a first plurality of plasma torches mounted to the first disc;

a second tunnel boring machine, comprising:

a second propulsion system;

a second enclosure carried by the second propulsion system;

a second torch support structure carried by the second enclosure, wherein the second torch support structure comprises a second disc mounted on a second rotatable shaft carried by the second enclosure and wherein the second disc has a second diameter larger than the first diameter; and

a second plurality of plasma torches mounted to the second disc; and

a first supply cable extending from the first enclosure to the second rotatable shaft.

13. The tunnel boring system of claim 12 , further comprising a power supply cable coupled to the second enclosure and adapted to supply power to the boring system from one or more power sources.

14. The tunnel boring system of claim 13 , further comprising a control system configured to select the one or more power sources from among multiple available power sources based on a corresponding cost and a corresponding availability of each of the multiple available power sources.

15. The tunnel boring system of claim 12 , further comprising a third tunnel boring machine, comprising:

a third propulsion system;

a third enclosure carried by the third propulsion system;

a third torch support structure carried by the third enclosure, wherein the third torch support structure comprises a third disc mounted on a third rotatable shaft carried by the third enclosure and wherein the third disc has a third diameter larger than the second diameter; and

a third plurality of plasma torches mounted to the third disc; and

a second supply cable extending from the second enclosure to the third rotatable shaft.

16. The tunnel boring system of claim 15 , further comprising one or more push-carts connected to the third tunnel boring machine.

17. A tunnel boring machine, comprising:

a propulsion system;

a torch support structure carried by the propulsion system; and

a plurality of plasma torches carried by the torch support structure, wherein the plurality of plasma torches are arranged on the torch support structure in a Fibonacci spiral.

18. The tunnel boring machine of claim 17 , wherein the torch support structure comprises a disc mounted on a rotatable shaft carried by the propulsion system, and wherein at least selected ones of the plurality of plasma torches are mounted to the disc.

19. A tunnel boring machine, comprising:

a propulsion system;

an enclosure carried by the propulsion system;

a torch support structure carried by the enclosure, wherein the torch support structure comprises a primary disc mounted on a rotatable shaft carried by the enclosure and at least one secondary disc spaced apart from the primary disc and mounted on the rotatable shaft;

a first plurality of plasma torches mounted to the primary disc and a second plurality of plasma torches mounted to the at least one secondary disc; and

a power supply cable coupled to the enclosure and adapted to supply power to the boring machine from one or more power sources.

20. The tunnel boring machine of claim 19 , further comprising a control system configured to select the one or more power sources from among multiple available power sources based on a corresponding cost and a corresponding availability of each of the multiple available power sources.

21. The tunnel boring machine of claim 19 , wherein at least selected ones of the first and second pluralities of plasma torches are arranged on the torch support structure in a Fibonacci spiral.