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Study on Influence of New Transfer Channel Construction on Deformation of Overlying Existing Metro Station in Sandy Pebble Stratum
(1 Guangzhou Metro Design Institute Co., Ltd., Guangzhou 510010; 2 Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031; 3 School of Civil Engineering, Southwest Jiaotong University,Chengdu 610031)
Abstract Based on the transfer channel project of Chengdu Metro Line 8, which is closely passes under the exist? ing metro station, the influence of mined excavation of the transfer channel on the track settlement, influence range and cross-section deformation of the existing metro station is analyzed by combining on-site monitoring and numerical simulation methods. It is concluded that: the settlement of the right track of the existing metro station is greater than that of the left track after completion of the mined excavation, the maximum settlement obtained by the numerical simulation is 4.82 mm and the error between the numerical simulation result and the measured value is 1.8%;along with the excavation of the pilot tunnel, the longitudinal beam of the existing metro station bottom slab is in a state of tension at the lower edge and compression at the upper edge within the influence range, the distance from the influence boundary of the existing metro station affected by the mined excavation to the excavation boundary is about 16 m and the influence range of the existing metro station is 55.5 m; in the process of mined excavation, a "tor? sion" phenomenon would occur in the cross-section deformation of the existing metro station, while the final crosssection settlement of the existing metro station at the exit side is slightly greater than that at the entrance side, with uniformity of the overall settlement.
Abstract：
Based on the transfer channel project of Chengdu Metro Line 8, which is closely passes under the exist? ing metro station, the influence of mined excavation of the transfer channel on the track settlement, influence range and cross-section deformation of the existing metro station is analyzed by combining on-site monitoring and numerical simulation methods. It is concluded that: the settlement of the right track of the existing metro station is greater than that of the left track after completion of the mined excavation, the maximum settlement obtained by the numerical simulation is 4.82 mm and the error between the numerical simulation result and the measured value is 1.8%;along with the excavation of the pilot tunnel, the longitudinal beam of the existing metro station bottom slab is in a state of tension at the lower edge and compression at the upper edge within the influence range, the distance from the influence boundary of the existing metro station affected by the mined excavation to the excavation boundary is about 16 m and the influence range of the existing metro station is 55.5 m; in the process of mined excavation, a "tor? sion" phenomenon would occur in the cross-section deformation of the existing metro station, while the final crosssection settlement of the existing metro station at the exit side is slightly greater than that at the entrance side, with uniformity of the overall settlement.
WANG Rui1 MIAO Longgang2,
3 ZHANG Huijian2,
3 NONG Xingzhong1 GUO Hongbo1
.Study on Influence of New Transfer Channel Construction on Deformation of Overlying Existing Metro Station in Sandy Pebble Stratum[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(6): 129-136
2021, Vol. 58 