The geological conditions of the Tian Ping Tunneling are extremely complex. It integrates high gas, high ground stress, high ground temperature, karst water gushing, toxic and harmful gases, fault fracture zone, expansive geology and other unfavorable geological integration. In such a harsh working environment, CREG wet shotcreting machine sprays 1,500 square meters per month, and sprays more than 20,000 square meters in total, which has guaranteed the smooth progress of the tunneling 

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