ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2018, Vol. 38 ›› Issue (S2): 261-267.DOI: 10.3973/j.issn.2096-4498.2018.S2.035
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CHEN Bin
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Abstract:
The Badaling Great Wall Station on BeijingZhangjiakou Highspeed Railway is an underground mined station, of which the transition section is designed as a single span with a maximum excavation span of 32.7 m and a maximum excavation area of 497 m2. The surrounding rock of superlarge crosssection tunnel is always characterized by large deformation and instability, the largescale mechanical construction cannot be applied to multiguide pilot excavation, the construction speed is low, and the prestressed anchorage cable in tunnel is difficult to be carried out. Hence, the so called DFHZ method, advanced excavation of tunnel top, layered downward excavation, core soil reserved and keys locking, is adopted, and the advantages of construction flowchart of the method are introduced. By adopting the abovementioned method, the tunnel safety can be guaranteed, the deformation and settlement of the surrounding rock can be reduced, and the mechanical construction is available. The stability of the surrounding rock can be guaranteed by using prestressed anchor rod and prestressed anchorage cable. During the construction of prestressed anchorage cable, the technologies, i.e. adding anchoring joints, setting up slurry with sulphoaluminate cement, free section grouting and then anchoring section, and highpressure grouting, etc.〖KG-*3〗, are adopted to shorten the construction schedule of anchorage cable and guarantee its safety. The monitoring results of crown top settlement and horizontal convergence at Zhangjiakou End are small, which indicates the rationality of the abovementioned method.
Key words: highspeed railway, mine station, superlarge crosssection, DFHZ method, prestressed anchorage cable, prestressed anchor rod
CLC Number:
U 451*.2
CHEN Bin. Mining Excavation Technology for Superlarge Crosssection Transition Section of Badaling Great Wall Station[J]. Tunnel Construction, 2018, 38(S2): 261-267.
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URL: http://www.suidaojs.com/EN/10.3973/j.issn.2096-4498.2018.S2.035
http://www.suidaojs.com/EN/Y2018/V38/IS2/261