›› 2013, Vol. 34 ›› Issue (S2): 306-310.

• Geotechnical Engineering • Previous Articles     Next Articles

Supporting technology for shallow large-span neighborhood loess tunnel

HE Li-chao1,2，WANG Meng-shu1，LI Yu-jie1   

  1. 1. Tunneling and Underground Engineering Research Center of Ministry of Education; Beijing Jiaotong University, Beijing 100044, China; 2. Beijing Capital Highway Development Group Co., Ltd., Beijing 100161, China; 3. Beijing Mass Transit Railway Operation, Subway Operation Technology Centre, Co., Ltd., Beijing 102208, China
  • Received:2012-11-11 Online:2013-11-11 Published:2013-11-19

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Abstract: With the Taohuayu loess tunnel of Wu-Xi expressway as the research object, it use field experiment and numerical simulation methods to research the influence laws of grating supporting and section steel supporting on shallow large-span neighborhood loess tunnel. The field experiment shows that the settlement caused by construction is uniform, and the control overall settlement ability by grating supporting and section steel supporting are similar. The stress of grating is smaller than section steel; and the stress distribution of grating is more uniform than section steel. The stress state of grating is similar to section steel; and they are reasonable. The numerical simulation shows that the displacement of section steel supporting is smaller than grating supporting. Compared with grating, the displacement on top arch of section steel supporting decreases 16%-18%, the convergence on side wall decrease 23%; the displacement on arch skew decrease 18%. Using twin-side heading method to excavate large-span tunnel in V grade loess tunnel, the surrounding rock has large plastic deformation. Plastic regional development range is very large, and it needs timely supporting. The plastic development scope by grating supporting and section steel supporting is similar.

Key words: large-span, loess tunnels, grating supporting, section steel supporting

CLC Number: 

  • U 452
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