ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2018, Vol. 38 ›› Issue (1): 91-102.DOI: 10.3973/j.issn.2096-4498.2018.01.012
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QING Weichen1, GAO Yang1, ZHU Yong1, ZHANG Huijian2
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Abstract:
The construction of ultra largespan fourtrack tunnel, of which the excavation area equals to 6 times of that of traditional singletrack railway tunnel, is difficult; and there is no successful precedent. The construction methods for ultra largespan fourtrack deep tunnel on Wumengshan No. 2 exit section on LiupanshuiZhanyi Railway are studied by numerical simulation and site monitoring methods. The results show that: 1) By using temporary support replaced by prestressed anchor, the temporary support of arch is successfully dismantled, the replacing construction risk of arch is reduced; the disadvantages of traditional soft rock tunnel construction are overcome; the safety and flexibility of support dismantling are improved; and large working face can be provided for followed construction step. 2) By using temporary crossbrace replaced by prestressed anchor cable, the temporary crossbrace dismantling risk is avoided; and the construction flexibility is improved. 3) The threebench excavation of ultra largespan tunnel is realized by using temporary support replaced by prestressed anchor and temporary crossbrace replaced by prestressed anchor cable.
Key words: deep railway tunnel, ultra largespan, construction method, temporary support replaced by prestressed anchor, temporary crossbrace replaced by prestressed anchor cable, numerical simulation, site monitoring
CLC Number:
U 455
QING Weichen, GAO Yang, ZHU Yong, ZHANG Huijian. Construction Methods for Ultra Largespan Fourtrack Deep Tunnel on Wumengshan No. 2 Exit Section[J]. Tunnel Construction, 2018, 38(1): 91-102.
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http://www.suidaojs.com/EN/Y2018/V38/I1/91
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