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Journal ArticleDOI

Structural Response of the Metro Tunnel under Local Dynamic Water Environment in Loess Strata

11 Feb 2019-Geofluids (Hindawi)-Vol. 2019, pp 1-16
TL;DR: Wang et al. as discussed by the authors studied the structural response of the tunnel in loess region under local hydrodynamic environment, an experimental testing in 1g as well as a numerical simulation were performed, in which the achieved results were verified and were found to be in good agreement.
Abstract: The reasons, prevention, and control of loess disaster are of great concern in practice. In recent years, Xi’an city, China, has taken the leadership in large-scale construction of subway lines in the loess strata. To study the structural response of the tunnel in loess region under local hydrodynamic environment, an experimental testing in 1g as well as a numerical simulation were performed, in which the achieved results were verified and were found to be in good agreement. Furthermore, the results showed that when the water outlet point is above the lining, the overall stress of the lining is “peanut shell,” as the water pressure of the outlet point decreases, the tensile stress of the top and bottom of the lining increases, while the compressive stress on both sides decreases; the channel form of the flow to the lining changes with the variation of the position of the water outlet point. It is worth mentioning that in the process of water gushing, the closer to the water source, the greater surface subsidence is, and there is a positive correlation between water pressure and surface subsidence. This study is of significant benchmark for the construction, maintenance, and prevention of tunnel in loess strata under the influence of water environment.
Citations
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Journal ArticleDOI
Rui Ren1, Hui Zhou, Zhao Hu1, Siyue He1, Xiuling Wang1 
TL;DR: In this article, the authors conducted a statistical analysis of tunnel fire accidents in China 2000-2016 and found that over half of TFAs in China result from vehicle technical problem, and the most TFAs occurred in the summer and winter seasons and the autumn season experiencing the least.

105 citations

Journal ArticleDOI
TL;DR: In this paper, a simple calculation scheme was proposed to estimate ground movements induced by horizontal jet grouting columns in fine-grained soils, considering the jetting parameters, soil properties, and volume of discharged spoil.

96 citations

Journal ArticleDOI
TL;DR: Wang et al. as discussed by the authors provided a case study on the Yingfeng tunnel (a tunnel constructed in soft rock consisting of a slate ground) based on a geological survey, indoor experiments and in situ monitoring.
Abstract: The Qingling–Bashan (QB) mountain region in southern Shaanxi mainly consists of strongly compressive zones from east to west, with tight folds and compressive fractures. There is a wide distribution of soft rocks of various types, such as phyllite and slate, accompanied by complex geological structures. Ironically, tunnel construction in these difficult grounds with complicated geological conditions embraces a high risk of extreme deformation due to various unpredictable reasons, which can frequently cause collapse and result in budget overruns during the construction period. Therefore, it is crucial to conduct effective countermeasures to eliminate or avoid such adverse impacts. This paper provides a case study on the “Yingfeng tunnel” (a tunnel constructed in soft rock consisting of a slate ground) based on a geological survey, indoor experiments and in situ monitoring. A successive rock mass deformation resulted in the tunnel lining seriously intruding into construction clearance and some other sections, even collapsing during the construction. The maximum displacement amount was 62.5 cm, while the maximum deformation speed reached as high as 34.18 mm/day. Additionally, to evaluate the construction impacts of tunnelling-induced geo-hazards, an investigation on extreme deformation was conducted. Considering the time-dependent features of the rock mass deformation, the constraint-convergence method was used to put forward applicable countermeasures in this paper. Finally, from the feedbacks of monitoring results, extreme deformation of the Yingfeng tunnel was effectively controlled.

86 citations

Journal ArticleDOI
TL;DR: In this paper, the impact of misalignment on pipe-jamming performance in alluvial soil deposits has been investigated and the results showed that the effect of misalignments had a significant impact on the performance of pipe ramming.

61 citations

Journal ArticleDOI
TL;DR: In this paper, the karst characteristics, unfavorable geological disasters, and treatment methods of YW railway tunnel were analyzed systematically, and the authors provided a reference for the construction of Zhengzhou-Wanzhou railway tunnel.
Abstract: From a global perspective, karst geological disaster has great influence on the tunnel construction. Once it is not handled properly, the karst problems in the tunnel area will cause great disaster, such as water inrush, mud gushing and collapse, etc. These karst disasters seriously affect the construction progress of the tunnel, resulting in equipment damage, casualties, and so on. The construction of Yichang–Wanzhou (YW) railway tunnel has created a miracle in the field of Chinese tunneling. The geology of tunnel area is quite complex, the karst disaster is remarkable, and the engineering construction is extremely difficult. In this paper, the karst characteristics, unfavorable geological disasters, and treatment methods of YW railway tunnel were analyzed systematically. The YW railway tunnel and Zhengzhou–Wanzhou (ZW) railway tunnel are both located in the Qinling-Daba (QB) mountainous area, and the regional geological conditions of them are very similar. Therefore, the research in this paper can be extended to the QB mountainous area, thus providing a reference for the construction of ZW railway tunnel. The investigation can also provide reference for the similar engineering.

53 citations

References
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Book ChapterDOI

[...]

01 Jan 2012

139,059 citations


"Structural Response of the Metro Tu..." refers background in this paper

  • ...In the past 10 years, Xi’an city, as a main developing city in Western China, has taken the leadership in large-scale construction of subway in the loess strata [14, 15]....

    [...]

Journal Article

11,116 citations

Journal ArticleDOI
Rong Li1, Zhang Haizhu1, Shengfeng Qin, Guofu Ding1, Xin Han1 
TL;DR: A rapid customization design prototype system has been developed and applied to the design of a high-speed train’s bogie to illustrate how to construct a product meta-model and how to conduct configuration design on different layers and variant design for generating new products.
Abstract: In order to effectively reuse the design knowledge of product family life cycle development and support holistic and rapid individual product design, this article presents a new meta-model-based sy...

436 citations

Journal ArticleDOI
TL;DR: Based on detailed field data from recent geo-hazards surveys in the Loess Plateau region of western China, the authors analyzes the key factors that control loess landslides.
Abstract: Based on detailed field data from recent geo-hazards surveys in the Loess Plateau region of western China, this study analyzes the key factors that control loess landslides. The evolution phase of river valleys, the geological structure of slopes and the geometry of slopes are all found to play a role in determining the occurrence, distribution and other characteristics of loess landslides. Groundwater and vegetation also contribute to their formation. A combination of human engineering activities and precipitation events are the principal triggering factors for the instability of loess slopes.

141 citations

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This study is of significant benchmark for the construction, maintenance, and prevention of tunnel in loess strata under the influence of water environment.