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 _    _      ___     _____      ______    ______  
| |  | ||   / _ \\  |  __ \\   /_   _//  /_____// 
| |/\| ||  / //\ \\ | |  \ ||   -| ||-   `____ `  
|  /\  || |  ___  ||| |__/ ||   _| ||_   /___//   
|_// \_|| |_||  |_|||_____//   /_____//  `__ `    
`-`   `-` `-`   `-`  -----`    `-----`   /_//     
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Text this: Stability analysis of underground excavation