›› 2005, Vol. 26 ›› Issue (6): 937-940.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis of deformation-failure for soft and hard multilayer roof of deeply buried tunnel

JIA Jian-qing1, WANG Hong-tu1, LI Xiao-hong1, HU Guo-zhong1, LI Kai-xue1,2, PANG Cheng1,2   

  1. 1.Key Lab for the Exploitation of Southwestern Resources & the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044, China; 2.Chongqing Engineering Profession Technology College, Chongqing 400030, China
  • Received:2005-03-08 Online:2005-06-10 Published:2013-12-17

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Abstract: In order to inquire into the activities of roof rocks and its influence on tunnel support, two methods are used to analyze the failure forms of multilayer roof rocks of a tunnel which is buried in depth of 700 m. One method is considering the roof rocks which are in the fields from above 112 m to surface as the uniformly distributed loads; and another method is to analyze the all roof rocks from tunnel roof to surface. The simulating results show that: the results of compression , displacement and shear stress which are calculated by the first method are identical with them calculated by the second method. It is showed that the roof rocks separate from each other at the certain height to tunnel center, and two or more hard rocks and soft rocks composite the combined strata. The stress of tunnel support comes from the first combined strata mainly; and we define this height as the key support stress circle. The heights of the key support stress circle calculated with theory and simulation is about 75 m, and the error is 5.2 %.

Key words: deeply buried tunnel, key pressure circle, composite roof, support system

CLC Number: 

  • U 451
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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