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MODERN TUNNELLING TECHNOLOGY 2012, Vol. 49 Issue (4) :152-155    DOI:
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Construction Technique for a Break-Through Section of a Tunnel in Soft Rock
China Railway 16th Bureau Group Co., Ltd
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Abstract Using the construction of the Yangjiawan tunnel on the Lanzhou-Chongqing railway as an example, this paper analyzes the degree and cause of deformation of surrounding rock and support during and after breaking through. By installing a primary support at both sides of the break-through section and using pre-support at the non-break through section, support deformation induced by breaking through was controlled and excavation stability and construction safety were guaranteed.
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Abstract： Using the construction of the Yangjiawan tunnel on the Lanzhou-Chongqing railway as an example, this paper analyzes the degree and cause of deformation of surrounding rock and support during and after breaking through. By installing a primary support at both sides of the break-through section and using pre-support at the non-break through section, support deformation induced by breaking through was controlled and excavation stability and construction safety were guaranteed.
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.Construction Technique for a Break-Through Section of a Tunnel in Soft Rock[J]  MODERN TUNNELLING TECHNOLOGY, 2012,V49(4): 152-155
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