أرسل هذا في رسالة قصيرة: Use of vertical reinforcement to reduce ground movement due to tunnelling

  ______   _    _    _    _    _    _    _    _   
 /_   _// | || | || | \  / || | || | || | \  / || 
 `-| |,-  | || | || |  \/  || | || | || |  \/  || 
   | ||   | \\_/ || | .  . || | \\_/ || | .  . || 
   |_||    \____//  |_|\/|_||  \____//  |_|\/|_|| 
   `-`'     `---`   `-`  `-`    `---`   `-`  `-`