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| Warning Standards Study of Real-time Monitoring for Anti-collapse in Large Cross-sefction Tunnel of Soft and Weak Surrounding Rock |
| MA Shi-wei1, HAN Xue-quan2, LIAO Kai1, DU Jun1 |
1. China Railway Southwest Research Institute Co.Ltd,Chengdu, Sichuan 610031, China;
2. China Railway Engineering Corporation, Beijing 100036, China |
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Abstract Research purposes:The statistics for tunnel disasters showed that the quantities and casualties of tunnel collapse are much higher than other tunnel disasters. Achieved warning before collapse in tunnel construction, can greatly reduce the tunnel collapse hazards. The key to achieve anti-collapse warning in soft and weak surrounding rock tunnel is to obtain anti-collapse warning standards. Therefore, it is necessary to study tunnel anti-collapse warning standards to guide safe tunnel construction.Research conclusions:(1) Deformation of the tunnel is relevant to hydrogeological conditions, construction method, construction progress and other factors. Currently, the standard values in criterion were not suitable for tunnel collapse warning. (2) It is practicable to achieve anti-collapse monitoring by relative deformation, because anti-collapse real-time monitoring focused on dome relative deformation differently from routine monitoring in soft and weak surrounding rock tunnel. (3) The reference value of tunnel anti-collapse real-time monitoring is determined by displacement limit value in criterion, the maximum value of the measured displacement in similar project and the measured data in tunnel project. (4) The field experiment indicated that the reference value could meet tunnel anti-collapse warning. Therefore, the research results can be applied to large cross-section tunnel of soft and weak surrounding rock.
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Received: 10 February 2014
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2014, Vol. 31 
