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| 2021, Vol. 58(3): 130-138 DOI: | ||
| Study on the Stress Characteristics of the Mid-pillar in the Expansion of an Existing Tunnel into a Double-arch Tunnel | ||
| (1 School of Highway, Chang′an University, Xi′an 710064; 2 Guangxi Key Lab of Road Structure and Materials, Nanning 530007;3 Guangxi Transportation Science and Technology Group Co., Ltd., Nanning 530007) | ||
| Received null Revised null | ||
| Supporting info | ||
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