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  2. Tunnel boring machine - Wikipedia

    en.wikipedia.org/wiki/Tunnel_boring_machine

    A tunnel boring machine (TBM), also known as a "mole" or a "worm", is a machine used to excavate tunnels. Tunnels are excavated through hard rock, wet or dry soil, or sand , each of which requires specialized technology.

  3. Drilling and blasting - Wikipedia

    en.wikipedia.org/wiki/Drilling_and_blasting

    The decision whether to construct a tunnel using a TBM or using a drill and blast method includes a number of factors. Tunnel length is a key issue that needs to be addressed because large TBMs for a rock tunnel have a high capital cost, but because they are usually quicker than a drill and blast tunnel the price per metre of tunnel is lower. [ 2 ]

  4. Tunnelling shield - Wikipedia

    en.wikipedia.org/wiki/Tunnelling_shield

    A rotating cutting wheel is located at the front end of the shield. Behind the cutting wheel there is a chamber where the excavated soil is either mixed with slurry (so-called slurry TBM) or left as-is (earth pressure balance or EPB shield), depending on the type of the TBM. The choice of TBM type depends on the soil conditions.

  5. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. Business correspondence - Wikipedia

    en.wikipedia.org/wiki/Business_correspondence

    Business letters are the most formal method of communication following specific formats. They are addressed to a particular person or organization. A good business letter follows the seven C's of communication. The different types of business letters used based on their context are as follows, Letters of inquiry; Letters of claim/complaints

  7. AOL Mail Help - AOL Help

    help.aol.com/products/new-aol-mail

    You've Got Mail!® Millions of people around the world use AOL Mail, and there are times you'll have questions about using it or want to learn more about its features. That's why AOL Mail Help is here with articles, FAQs, tutorials, our AOL virtual chat assistant and live agent support options to get your questions answered.

  8. Trenchless technology - Wikipedia

    en.wikipedia.org/wiki/Trenchless_technology

    It is a rapidly growing sector of the construction and civil engineering industry. It can be defined as "a family of methods, materials, and equipment capable of being used for the installation of new or replacement or rehabilitation of existing underground infrastructure with minimal disruption to surface traffic, business, and other activities."

  9. Fantasy football waiver wire: 10 players to add for NFL Week 14

    www.aol.com/fantasy-football-waiver-wire-10...

    Stepping into a starting role just in time for the fantasy playoffs, San Francisco RB Isaac Guerendo is worth grabbing at all costs.