Cracks in concrete tunnel linings are inevitable during service life. It is necessary to keep abreast of the cracking condition of the lining and formulate reasonable inspection and maintenance measures to ensure operational safety. Considering the influence of train loads on the safety and service performance of cracked linings. the expansion process of lining cracks and the maintena... https://mandisattictoyers.shop/product-category/board-game-mattel-barbie/