There are many loopholes in Musk Losangeles underground tunnel being questioned by MIT experts.

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 There are many loopholes in Musk Losangeles underground tunnel being questioned by MIT experts.


Photo 1: a test tunnel excavated by BoringCompany of musk tunnel tunnel in Hawthorne, California, a Tesla ModelS is passing through. Musks view is that his tunnel mining company BoringCompany can build a tunnel for transport purposes faster and cheaper than the existing technology, mainly because his machines can dig tunnels quickly, and the tunnels are about half the diameter of the subway. After the tunnel was built, the unmanned electric skateboard platform would speed up to 150 kilometers per hour or faster, helping the car or the passenger cabin to pass through the underground tunnel. And the long-distance tunnels connecting cities will use super high-speed trains with speeds of over 960 kilometers per hour. Herbert Einstein (HerbertEinstein), a professor of engineering and engineering professor at the Massachusetts Institute of Technology (MIT), says it is not easy to cut the cost of tunnel drifting, and the musks underground electric vehicle may be a bigger challenge. Einstein explained: Musks tunnel construction machine looks very standard. But I dont see anything different from others, except for bigger diameter. But passenger pod may be a new thing, it needs to be able to withstand the challenge of long-distance operation. However, this looks more like developing new vehicles rather than tunneling technology. Musks ambition for BoringCompany is as bold as his space exploration technology company SpaceXs space program, Teslas electric car and battery project, and the SolarCitys clean energy project. For years, musk has been complaining about traffic problems in Losangeles, even helping to widen highway 405 in 2013 so that he can reach Hawthornes SpaceX headquarters faster from his home. But to build and run the underground transport system by building a civil engineering company, it seems to be far away to make a profit, even for musk. Fig. 2: a passenger pod model recommended by musk for use in the BoringCompany tunnel. Because the pod will travel underground at a speed of 150 km or faster, passengers may not be willing to stand. Konstantin Samaras (ConstantineSamaras), an assistant professor of civil and environmental engineering at the Carnegie Mellon University, said: the concept of a car skateboard platform adds a lot of engineering challenges, such as the reliability and safety of the skateboard platform, and the loading and unloading time, and the city needs a large amount of special areas to achieve its large-scale popularization. Use. Samaras wasnt sure whether the skateboard platform would work, but he saw the potential benefits of Musks new adventure. The result of the best use case for BoringCompany is to use existing tunnel boring machines to innovate and substantially reduce costs to build tunnels for high capacity and fast transportation systems, he said. The cost of developing this technology is not low, so BoringCompany said in a document this month that it raised nearly $113 million, of which $100 million came from Mask himself. The Losangeles Municipal Council also supports the environmental impact assessment of the company, so as to help speed up the construction of the 4.34 km long test tunnel on the west side of the city. BoringCompany is also negotiating a project with Chicago, which will connect New York and Washington in the future. However, from the convincing concept discussion to the beginning of construction depends on whether BoringCompany can achieve its ambitions. At present, the cost of digging a tunnel is very high. Some projects cost up to 1 billion dollars per mile (1.6 kilometers), the company said on its website. In order to build a feasible tunnel network, the cost of tunneling must be reduced by more than 10 times. Einstein said that the BoringCompany tunnel with a diameter of 4.27 meters should be faster and cheaper than building a modern subway tunnel, because the diameter of the latter may be close to 8.5 meters. The smaller the tunnel diameter, the faster and cheaper you can build it, he said. This is of course a fact, but I dont know if the cost will be substantially reduced. This is because the geological factors faced by different projects are also very different. As we all know, earthquakes frequently occur in Losangeles, which must be taken into account. In addition, the city is also located in methane pockets, tar deposits and other complex environments, making the cost of tunnel construction extremely expensive. Einsteins Massachusetts Institute of Technology team developed a tunneling decision aid tool to estimate cost and construction time, based on project specifications and geological factors. This tool is widely used in tunnel engineering, especially in Europe. Einstein said, I wrote a letter to musk last year to see if he is interested in understanding our tools and making cost estimates. But I never got a reply. When it comes to cost estimation, you tend to get into trouble because there is always uncertainty. You dont know geology, you dont know the specific construction process. Like the smaller tunnels built by musk, they were used in Londons original subway lines in the early nineteenth Century, but they were later disgraced. Einstein said, at first, the subway cars were suitable for these tunnels. But for security reasons, they no longer do so. You want to evacuate safely when the train is jammed, but if the tunnel wall is next to the train body, you may not be able to evacuate. BoringCompany, a spokesman for the Losangeles County Metropolitan Transportation Administration (LosAngelesCountyMetropolitanTransportationAuthority), says BoringCompany is trying to build the PurpleLine subway tunnel that extends to 6.55 meters in diameter in West Losangeles. They are being built large enough for emergency vehicles to enter. As the Losangeles County Metropolitan Transportation Authority is studying the construction of a large tunnel project in West Losangeles, it requires BoringCompany to coordinate any mining activities with the agency. We look forward to working with BoringCompany to make early planning and engineering to ensure that our two projects are consistent and to best meet the future traffic needs of this crowded corridor, Sotelo said. Any BoringCompany system takes years to build, so the cost of building and operating such systems is still difficult to calculate, and the number of people choosing to use it is unsure. Samaras said, I do not have such survey data, but I guess most people would prefer to walk on the ground and ride bicycles. (small) source of this article: NetEase science and technology report editor: Wang Fengzhi _NT2541 As the Losangeles County Metropolitan Transportation Authority is studying the construction of a large tunnel project in West Losangeles, it requires BoringCompany to coordinate any mining activities with the agency. We look forward to working with BoringCompany to make early planning and engineering to ensure that our two projects are consistent and to best meet the future traffic needs of this crowded corridor, Sotelo said. Any BoringCompany system takes years to build, so the cost of building and operating such systems is still difficult to calculate, and the number of people choosing to use it is unsure. Samaras said, I do not have such survey data, but I guess most people would prefer to walk on the ground and ride bicycles. (small)