RISK ASSESSMENT AND CONTROL OF TUNNELING BASED ON AHP AND UNASCERTAINED MEASURE METHOD

The risk factors of tunnel construction are not only the objective factors such as complex geological conditions, but also the subjective factors such as construction level. Therefore, this paper attempts to integrate subjective influencing factors into the evaluation index system. Six factors such as surrounding rock conditions, geological prediction ability and construction team quality are selected as the risk evaluation indexes of tunnel construction according to relevant codes and engineering examples. It takes shenzhen east transit expressway connecting line tunnel construction as an example and uses analytic hierarchy process to determine index weight. According to the unascertained measure method, we evaluated the construction risk level of the tunnel and analyzed the possible risk points, and put forward targeted improvement measures and construction suggestions. On the basis of on-site rectification, the model was used to re-evaluate until the risk is acceptable. Engineering practices showed that this method achieves ideal risk control effect.