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发布时间:2018-11-09 09:12:24 来源: 分享到:


The 12615m long (6,318m of the left hole and 6307m of the right hole) Zhaotong-Leshan Expressway Chuansi-Foeryan Mt. Jiaoding Tunnel was constructed by CCCC Second Highway Engineering Co., Ltd. and is the controling project of this line. Thanks to the complex and changeable tunnel surrounding rock fissure development, frequent water gushing, rock burst outburst through the coal stratum, gas overflow in many sections, thus, the construction is difficult, and in a high safety risk. 

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