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Numerical study of the segmental tunnel lining behavior under a surface explosion – Impact of the longitudinal joints shape
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.compgeo.2020.103822 Alireza Rashiddel , Mehdi Kharghani , Daniel Dias , Mohsen Hajihassani
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.compgeo.2020.103822 Alireza Rashiddel , Mehdi Kharghani , Daniel Dias , Mohsen Hajihassani
Abstract In recent years, the vulnerability and protection of subsurface structures under blast loads became a fundamental issue in terms of security (loss of lives and structural damage). A tunnel can be considered as an underground shelter and is a crucial structure owing to its conservative nature against explosions. This study is performed to obtain a further understanding of surface explosion influence on segmental tunnels. In this paper, a tunnel lining and its segmentation with planar and curved joints under dynamic loads were investigated. In this regard, a 2D finite-deference simulation of the Tehran metro segmental lining was conducted. Subsequently, an explosion wave stress of 500 kg of TNT explosive was considered as the reference loading case. The results indicated that the segmental lining with curved joints is efficient and succeeds in neutralizing the surface explosion. The maximum bending moments and axial forces in the curved segmental lining are lower than in the planar segmental and continuous lining. In terms of vertical and horizontal displacements of the tunnel lining, the segmental structure with curved joints induces the minimum deformation amount. The continuous lining and planar segmental lining show instability under the reference blast load. Finally, it can be concluded that the segmental lining with curved joints is highly efficient and stable in case of a surface explosion.
中文翻译:
地表爆炸下管片隧道衬砌行为的数值研究——纵向接头形状的影响
摘要 近年来,地下结构在爆炸载荷下的脆弱性和保护成为安全(生命损失和结构损坏)方面的基本问题。隧道可以被视为地下避难所,并且由于其对爆炸的保守性而成为重要的结构。进行这项研究是为了进一步了解地表爆炸对管片隧道的影响。在本文中,研究了隧道衬砌及其在动态载荷下具有平面和弯曲接头的分段。在这方面,对德黑兰地铁管段衬砌进行了二维有限差分模拟。随后,将 500 kg TNT 炸药的爆炸波应力作为参考载荷情况。结果表明,带弧形接头的管片衬砌是有效的,并成功地中和了地表爆炸。弯曲管片衬砌的最大弯矩和轴向力低于平面管片和连续衬砌。就隧道衬砌的纵向和横向位移而言,弯曲节理的管片结构引起的变形量最小。连续衬砌和平面分段衬砌在参考爆炸载荷下表现出不稳定性。最后,可以得出结论,在表面爆炸的情况下,具有弯曲接头的管片衬砌是高效且稳定的。就隧道衬砌的纵向和横向位移而言,弯曲节理的管片结构引起的变形量最小。连续衬砌和平面分段衬砌在参考爆炸载荷下表现出不稳定性。最后,可以得出结论,在表面爆炸的情况下,具有弯曲接头的管片衬砌是高效且稳定的。就隧道衬砌的纵向和横向位移而言,弯曲节理的管片结构引起的变形量最小。连续衬砌和平面分段衬砌在参考爆炸载荷下表现出不稳定性。最后,可以得出结论,在表面爆炸的情况下,具有弯曲接头的管片衬砌是高效且稳定的。
更新日期:2020-12-01
中文翻译:
地表爆炸下管片隧道衬砌行为的数值研究——纵向接头形状的影响
摘要 近年来,地下结构在爆炸载荷下的脆弱性和保护成为安全(生命损失和结构损坏)方面的基本问题。隧道可以被视为地下避难所,并且由于其对爆炸的保守性而成为重要的结构。进行这项研究是为了进一步了解地表爆炸对管片隧道的影响。在本文中,研究了隧道衬砌及其在动态载荷下具有平面和弯曲接头的分段。在这方面,对德黑兰地铁管段衬砌进行了二维有限差分模拟。随后,将 500 kg TNT 炸药的爆炸波应力作为参考载荷情况。结果表明,带弧形接头的管片衬砌是有效的,并成功地中和了地表爆炸。弯曲管片衬砌的最大弯矩和轴向力低于平面管片和连续衬砌。就隧道衬砌的纵向和横向位移而言,弯曲节理的管片结构引起的变形量最小。连续衬砌和平面分段衬砌在参考爆炸载荷下表现出不稳定性。最后,可以得出结论,在表面爆炸的情况下,具有弯曲接头的管片衬砌是高效且稳定的。就隧道衬砌的纵向和横向位移而言,弯曲节理的管片结构引起的变形量最小。连续衬砌和平面分段衬砌在参考爆炸载荷下表现出不稳定性。最后,可以得出结论,在表面爆炸的情况下,具有弯曲接头的管片衬砌是高效且稳定的。就隧道衬砌的纵向和横向位移而言,弯曲节理的管片结构引起的变形量最小。连续衬砌和平面分段衬砌在参考爆炸载荷下表现出不稳定性。最后,可以得出结论,在表面爆炸的情况下,具有弯曲接头的管片衬砌是高效且稳定的。