ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2013, Vol. 33 ›› Issue (7): 597-601.DOI: 10.3973/j.issn.1672-741X.2013.07.012
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CAI Hui
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Abstract:
A tunnel passes through completelyweatheredtointenselyweathered diabase, which is a kind of swelling rock mass. The difficulties in the construction of the tunnel located in the swelling diabase are studied by means of site monitoring and theoretical calculation. Conclusions drawn are as follows: 1) The weathered swelling diabase has such properties as containing a large amount of kaolinite, swelling when water is absorbed, shrinking when water is lost and being subject to spalling; 2) The tunneling may encounter such difficulties as uneven stress on the primary support, spalling of the primary shotcrete, serious deformation, failure and collapse; 3) Countermeasures to overcome abovementioned difficulties include controlling the deformation of the primary support, keeping good drainage conditions and preventing the diabase from contacting water.
Key words: tunnel, completelyweatheredtointenselyweathered diabase, swelling rock mass, bench cut method, primary support, deformation, spalling, collapse
CAI Hui. Difficulties in Construction of Tunnels in Swelling Diabase and Their Countermeasures[J]. Tunnel Construction, 2013, 33(7): 597-601.
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URL: http://www.suidaojs.com/EN/10.3973/j.issn.1672-741X.2013.07.012
http://www.suidaojs.com/EN/Y2013/V33/I7/597
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