Epigenetic reformation,Surrounding rock grade,Strength level,Rock mass structure," /> Epigenetic Reformation of the Rock Mass in the Chijiahe Tunnel and its Relationship with the Surrounding Rock Grade
 
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MODERN TUNNELLING TECHNOLOGY 2014, Vol. 51 Issue (5) :9-14    DOI:
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Epigenetic Reformation of the Rock Mass in the Chijiahe Tunnel and its Relationship with the Surrounding Rock Grade
(1 The State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059; 2 Sichuan Communication Surveying & Design Institute, Chengdu 610017)
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Abstract In order to investigate the surrounding rock quality in the Chijiahe tunnel, the strength grade of epigenetic reformation is preliminarily classified, and the surrounding rock classification proposal is applied to the geological conditions of the Chijiahe tunnel. A construction period is established, and the relationship between epigenetic reformation and surrounding rock grades is discussed on the basis of epigenetic reformation characteristics and the spatial development law at the tunnel site. The results show that the rock mass at the Chijiahe tunnel site has suffered strong epigenetic reformation, being mainly characterized by developed low-angle structural planes and steeply dipping fractures. The rock mass structure and grade at the Chijiahe tunnel site are governed by an epigenetic reformation with strengths that can be classified into three levels: strong, medium, and slight. The surrounding rock at the strongly reformed zone is commonly Grade V; at the medially reformed zone, most of the rocks are Grade IV and a few are Grade V; and at the slightly reformed zone, most of the rocks are Grade III and a few are Grade IV. The epigenetic reformation zones at the Chijiahe tunnel site, which control of the grades of the surrounding rock, are mostly of the medium level.
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MENG Lu-Bo-1
Li-Tian-Bin-1
Fang-Xing-1
He-Yong-2
Keywords： Epigenetic reformation')" href="#">     
Abstract： In order to investigate the surrounding rock quality in the Chijiahe tunnel, the strength grade of epigenetic reformation is preliminarily classified, and the surrounding rock classification proposal is applied to the geological conditions of the Chijiahe tunnel. A construction period is established, and the relationship between epigenetic reformation and surrounding rock grades is discussed on the basis of epigenetic reformation characteristics and the spatial development law at the tunnel site. The results show that the rock mass at the Chijiahe tunnel site has suffered strong epigenetic reformation, being mainly characterized by developed low-angle structural planes and steeply dipping fractures. The rock mass structure and grade at the Chijiahe tunnel site are governed by an epigenetic reformation with strengths that can be classified into three levels: strong, medium, and slight. The surrounding rock at the strongly reformed zone is commonly Grade V; at the medially reformed zone, most of the rocks are Grade IV and a few are Grade V; and at the slightly reformed zone, most of the rocks are Grade III and a few are Grade IV. The epigenetic reformation zones at the Chijiahe tunnel site, which control of the grades of the surrounding rock, are mostly of the medium level.
Keywords： Epigenetic reformation')" href="#">     
published: 2014-08-05
Cite this article:   
MENG Lu-Bo-1, Li-Tian-Bin-1, Fang-Xing-1 etc .Epigenetic Reformation of the Rock Mass in the Chijiahe Tunnel and its Relationship with the Surrounding Rock Grade[J]  MODERN TUNNELLING TECHNOLOGY, 2014,V51(5): 9-14
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