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Parameters Research on Second-Lining Support of Small Interval Tunnel in Weak Rocks

Author: LiYongYong
Tutor: HuangZhiYi
School: Zhejiang University
Course: Road and Railway Engineering
Keywords: Neighborhood Tunnel Support parameters Weak Surrounding Finite Difference Method Visco-elastic - plastic model
CLC: U455.7
Type: Master's thesis
Year: 2011
Downloads: 124
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Abstract


Neighborhood tunnel engineering with its unique advantages more and more favored by the engineering sector . This paper, relying on the highway Huangqunan neighborhood tunnel engineering , field testing and computer numerical simulation method of combining secondary lining of banana dock tunnel weak surrounding rock structure supporting opportunity from a two-dimensional state and three-dimensional state , support stiffness and support the protection thickness more systematic study achieved the following results : 1, found in the the second lining structure support parameters of the two-dimensional analysis : the timing of the second lining support structure of the secondary lining , 40 days is about tunneling works reasonably supporting opportunity ; supporting stiffness of the secondary lining the mechanical condition of the structure of the secondary lining have a certain impact , but the impact is relatively small , according to the value of common use in the engineering design and construction reasonable support stiffness value is taken as the E = 30 GPa ; mechanical state of the secondary lining thickness of the supporting structure of the secondary lining impact is not great , but can still be found from the slight changes 48cm more reasonable economic support thickness . As can be seen , according to the results of the two-dimensional analysis to improve tunnel secondary lining the mechanical properties of the scheme are charged to care better opportunity than the thickness of the support is better than the stiffness of the support . In order to ensure the safety of the structure of the second lining during weak surrounding rock structure design the stiffness method works by changing the structure of secondary lining small, should make the most of the surrounding rock pressure by changing other parameters ( such as initial support parameter ) initial support to bear , the structure of the secondary lining is only a safe reserve structure to assume the role of special loads and early lining found , on the basis of the analysis of chapters IV and V , the banana dock tunnel weak Wai the rock section the YK56 880 section surrounding rock near the first hole of the second lining structure supporting parameters : the optimal support stiffness E = 30 GPa ; optimal support to 48cm thick ; first hole in the second lining best supporting opportunity for 43 days ; the best construction of the first hole and underwent hole spacing of 6m.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Tunneling,guided Lane and support
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