Abstract：
Abstract The dangerous level classification for hazardous factors in highway tunnel construction can help to determine major hazard sources and to prioritize corresponding countermeasures. Based on the identification of hazard sources related to construction activities and equipments, six safety assessment units are classified: tunnel excavation, blasting, construction power supply, construction ventilation, mucking and transporting, and supporting and lining. Furthermore, the different scores and corresponding judgment clauses are determined for three indicators of C (hazard consequence), E (exposure frequce), and L(hazard likehood). Meanwile, an additional safety compensation coefficient R, with relevant judgment clauses and scores, is introduced. Regarding the above four indicators, if any judgment clause is met, whichever corresponding score of the evaluation indicator is the highest shall be taken. In this way, the LEC method is improved and five grades of dangerous level D are established. Through an applicationcase, the results show that accurate evaluation for the same hazard source is available, and the dangerous level D is closely related to the safety compensation coefficient R. This evaluation method with its general applicability is not confined to evaluating a certain assessment unit.
LIU Hui,
Sun-Shi-Mei
.Study on the Construction Safety Assessment of Highway Tunnels Based on the Improved LEC Method[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(1): 26-32
2015, Vol. 52 