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Keywords: ground surface
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Proceedings Papers

Paper presented at the ISRM SINOROCK 2013, June 18–20, 2013
Paper Number: ISRM-SINOROCK-2013-106
..., and finally the collapse develops to the ground surface. Finally, for small spacing tunnels, the stabilization of the middle rock pillar is much more important. 1 Introduction The construction and development of small spacing tunnels is one of the hot issues in transportation area, because it has...
Proceedings Papers

Paper presented at the ISRM International Symposium on Rock Mechanics - SINOROCK 2009, May 19–22, 2009
Paper Number: ISRM-SINOROCK-2009-146
... to be weathered. It was distributed in the depth of less than 10.7~16.0m from the ground surface. Its crack and joint were developed by selective weathering and cores collected in the drilling process were collected to rock pieces and short/long column. TCR was 10~65% and RQD was 0~30%. Its color was rose pink...

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