Experimental study of a segmented metro tunnel in a ground fissure area

2017 ◽  
Vol 100 ◽  
pp. 410-416 ◽  
Author(s):  
Nina Liu ◽  
Qiangbing Huang ◽  
Yujie Ma ◽  
Rifat Bulut ◽  
Jianbing Peng ◽  
...  
2020 ◽  
Vol 79 (11) ◽  
Author(s):  
Junling Qiu ◽  
Yuquan Lu ◽  
Jinxing Lai ◽  
Yuwei Zhang ◽  
Tao Yang ◽  
...  

2011 ◽  
Vol 243-249 ◽  
pp. 3376-3380
Author(s):  
Kai Ling Li ◽  
Hong Jia Liu ◽  
Yang Liu

Ground fissures is one of typical geo-hazards in Xi’an area, which may cause damage of various types of buildings, city lifeline projects and resources, especially endangering the construction and running of Xi’an Subway. Ground fissures in Xi’an were introduced firstly, and models of land deformations and section destroy were found around Xi’an subway. Secondly, based on the interface mechanics, mechanical characteristics of interface between stratum on fissure and metro tunnel are studied, and void underneath metro tunnel are analyzed emphatically. At last, the result of numerical simulation shows that distribution law and amount of frictional force, scale and location of void under the tunnel, influence deformation and stress of tunnel; and then it also provides a theory basis for effective forecast evolution process of void underneath.


2013 ◽  
Vol 405-408 ◽  
pp. 1334-1339
Author(s):  
Yi Yuan ◽  
Qiang Bing Huang ◽  
Jie Han ◽  
Ming Li Li

A model test was performed to investigate the impact of active ground fissure on metro tunnel. The test results show that under the action of active ground fissure, the metro tunnel behaviors as a cantilever elastic foundation beam, and the top is in tension and its bottom is in compression. The tensile parts are located in the foot-wall with the range 0.75~2.33D(D is tunnel diameter) distance from active ground fissure and the compressive parts are mainly located in the foot-wall with the range 3D distance from the fissure. When the settlement of hanging wall of ground fissure reaches 1cm(25cm in prototype), the tunnel bottom appear cavity in the hanging wall and cracks in the foot-wall. With the settlement development of the hanging wall of active ground fissure the vertical soil pressure on the top of tunnel greatly increases and reduces at the bottom of tunnel in the hanging wall.


Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Nina Liu ◽  
Quanzhong Lu ◽  
Xiaoyang Feng ◽  
Wen Fan ◽  
Jianbing Peng ◽  
...  

Shaking table model test and numerical simulation model were conducted on scaled tunnel model to investigate the mechanism and effect of seismic loadings on metro tunnel which is closely parallel to an active ground fissure. Key technical details of the experimental test were set up; for example, similarity relations, boundary conditions, sensors layout, and modelling methods were presented. Synthetic wave, El Centro wave, and Kobe wave were adopted as the input earthquake waves. Results measured from shaking table model and numerical model were compared and analyzed. It is found that the fissure increased the dynamic response features as accelerations and strains of the tunnel, especially in the part close to the fissure. Average incremental percentage of acceleration amplifying coefficient was 8.33% from the wall close to fissure than the symmetrical one. The short distance to fissure led to serious circumferential dynamic strain, while the distance to fissure influenced the axial dynamic strain less. The numerical analysis results have a good correspondence with those of the shaking table model test. The waves at the top of tunnel have more scattering and emission effect. The fissure increases the dynamic response of the tunnel close to it.


Author(s):  
Jianbing Peng ◽  
Kai He ◽  
Xiao Tong ◽  
Qiangbing Huang ◽  
Cong Liu

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