Safety Evaluation Method for Ground Ammunition and Explosive Storage Facilities due to Underground Tunnel Blast

지하시설 굴착공사에 따른 탄약저장시설 안전성 평가방법 연구

Abstract

Recently, expansion of urban and social infrastructures is planned to go through the transfer of military facilities or crossing the infrastructures via underground tunnels. However, when crossing facilities such as ammunition and explosive storages, a high level of safety assessment is required to prevent an accidental explosion of ground ammunition. In this study, a case study was conducted to evaluate the effect of blasting for the construction of tunnel on the ground ammunition facilities. The design section of Sinansan train operated by the Korea Railroad Authority with agreement of the Ministry of National Defense was selected. For the purpose of this study, the vibration velocity due to explosion was predicted by using GTS-NX, a numerical analysis program. Through literature review, it was confirmed that the vibration velocity of 0.2cm/sec can be a safety evaluation standard. These safety evaluation indicators and procedures used in this study can be utilized as an index of safety evaluation in the planning of social infrastructures that cross the ammunition facilities in the future.

도심과 사회기반시설의 확장에 대한 수요로 인해 군사시설의 이전이나 시설의 지하화가 지속적으로 요구되고 있다. 그러나 탄약시설과 같은 시설을 횡단할 때에는 탄약이 우발적으로 폭발하지 않도록 고도의 안전성 평가가 선행되어야 한다. 이에 지중 구조물의 건설을 위한 발파작업이 지상의 탄약시설에 미치는 영향을 분석하기 위해 국방부와 한국철도시설공단간 협의에 의해 진행되는 신안선 복선 전철 설계구간 중 군사 보안구역을 통과하여 건설되는 터널구간에 대해 사례연구를 실시하였다. 폭발현상에 의한 진동의 속도를 수치해석 프로그램인 GTS-NX를 활용하여 예측하였고 문헌조사를 통해 모든 형태의 구조물에 대해서도 안전에 영향을 미치지 않는 0.2cm/sec의 지반진동속도를 안전성 평가기준으로 제시하였다. 본 연구에서 활용된 안전성 평가지표와 절차는 향후 탄약시설을 횡단하는 사회기반시설 계획 시 안전성 평가의 지표로 활용될 수 있을 것이다.

Figure 1. Process of safety assessment

Figure 2. 3-D geometry design

Figure 3. Ground and tunnel mesh design

Figure 4. Location of ground ammunition and explosion storage facilities and representative nodes for A troop

Figure 5. Location of ground ammunition and explosion storage facilities and representative nodes for B troop

Figure 6. Location of ground ammunition and explosion storage facilities and representative nodes for C troop

Figure 7. Contour plots for A troop model

Figure 8. Contour plots for B troop model

Figure 9. Contour plots for C troop model

Table 1. The tolerance standard of singapore

Table 2. The tolerance standard of South Korea

Table 3. The tolerance standard of Russia

Table 4. The results of soil investigation

Table 5. Dynamic properties of soil layers

Table 6. Natural period used in models

Table 7. Parameters used in dynamic load

Table 8. Analyzed maximum vibration velocity