Classification Method of Monitoring Level in Railway Tunnel Construction Phase and Its Application
(1. State Key Laboratory of Geological Disaster Prevention and Geological Environment Protection, Chengdu University of Technology,Chengdu 610059; 2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031)
Abstract：
The instrumentation and monitoring in the construction phase of railway tunnels is an important means to ensure the informatization construction. At present, the instrumentation and monitoring items and contents of the tunnel are mainly determined by the qualitative determination of the surrounding rock level. No unified quantitative evaluation system has been established. Based on the risk analysis theory and the risk probability index & risk consequence index faced by tunnel, the monitoring level and classification method of railway tunnel construction phase are established. We take the unascertained measurement theory as the risk probability index evaluation method, select eight impact indexes, such as rock weathering degree, rock quality index and uniaxial saturated compressive strength, and construct the index measurement function. Also, we combine the improved analytic hierarchy process to weight each evaluation index, determine the risk probability index according to the confidence identification criteria, and calculate the monitoring level index quantitatively to determine the monitoring level and corresponding monitoring content. Taking Xiaocaoba Tunnel of Chongqing-Kunming Railway as an example, the monitoring level of the three mileage sections of the tunnel during construction phase is divided. The evaluation results show that the monitoring level of DK344+200~DK344+220 section is C.
LU Junfu1 ZHANG Hongxin1 PEI Qifan2
.Classification Method of Monitoring Level in Railway Tunnel Construction Phase and Its Application[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(1): 202-208
2023, Vol. 60 