Abstract
During the construction of karst Tunnel, tunnel collapse often occurs. The establishment of early-warning system of tunnel collapse can effectively ensure the construction safety, but the research is insufficient. Based on the combination of theoretical analysis and engineering practice, this paper puts forward to early-warning system for karst tunnel collapse. (1) The evaluation index system of karst tunnel collapse is composed of anchor axial force, displacement, anchor pull-out force and steel arch stress. (2) The relationship between evaluation index and warning level is determined, and the early-warning system of tunnel collapse is established. (3) The model applied to Chong’anjiang tunnel collapse warning, and achieved good results.
Highlights
1 Introduction early-warning from monitoring measurement and from geological advance prediction
(3) The model applied to Chong'anjiang tunnel collapse warning, and achieved good results
The establishment and application of karst tunnel collapse early-warning system can effectively ensure the safety of tunnel construction and reduce losses
Summary
Evaluation index and grade are no longer considered here. The evaluation indexes are divided into two levels. There are many evaluation indexes that affect the according to the different positions of anchor and stability of karst tunnel. Based on the relevant research different displacement monitoring positions, as shown and comprehensive analysis, the indexes of bolt axial in Table 2 force, displacement, bolt pull-out force and steel arch stress are selected to form the evaluation index system of tunnel stability. In order to achieve the purpose of dynamic early-warning, the geological and
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