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| 2020, Vol. 57(4): 194-200 DOI: | ||
| Key Techniques for Rapid Construction of Parallel Heading of Karst Tunnel in Chongqing Section of Zhengzhou-Wanzhou Railway | ||
| (1 Chongqing-Wanzhou Railway Co., Ltd., Chongqing 400014; 2 The 1st Engineering Co., Ltd. of China Railway Tunnel Group ,Chongqing 401120) | ||
| Received null Revised null | ||
| Supporting info | ||
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