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| Research on the Key Technology for Special Shaped Deep Shaft in Water - rich Gravel Formation and Complex Environment |
| WANG Tin – ming |
| (China Railway First Survey & Design Institute Group Co. Ltd, Xi’an, Shaanxi 710043 , China) |
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Abstract Abstract ： Research purposes ： As for the special shaped deep shaft located in the triangular block encircled by existing shield tunnel and ventilation pavilion, based on the protection of surrounding environment in water - rich gravel formation, this paper proposes the design and construction scheme for the special shaped deep shaft, which can guarantee the stability of shaft structure and the surrounding environment safety. Research conclusions ： (1) Dewatering scheme for deep shaft which can efficiently control the outflow of fine particles is put forward. (2) The structural safety of the expansion excavation in deep shaft can be ensured on the basis of the large pipe shed installed downward on the shaft wall, the length of which is beyond the potential failure plane. (3) The adverse impacts of the special shaped deep shaft construction are mainly concentrated on the left side of shield tunnel, and the initial disturb should be controlled. ( 4 ) The overall structural stiffness of ventilation pavilion on the right side is bigger, the limited earth pressure btween ventilation pavilion and dep shaft is lesser, and the influence of shaft excavation on the ventilation pavilion is smaller. ( 5 ) The schemes for special shaped deep shaft construction, especially the large pipe shed method, are feasible and economical, which can be applied in deep shaft engineering under the strict environmental protection requirements.
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Received: 08 March 2016
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2016, Vol. 33 
