上穿公路隧道偶然爆炸对下方供水隧洞影响研究
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摘要
新建公路隧道从既有供水隧洞上方穿过,在空间上形成交叉隧道,上下隧道最小净距21.5 m,为评价上穿隧道偶然爆炸对下方供水隧洞稳定的影响,应用ANSYS/LS-DYNA对其进行了数值模拟研究。结果表明:当上穿公路隧道油罐车在运输过程中发生爆炸时,下方供水隧洞的拱顶、拱腰对爆炸冲击波的响应较大,最大振动速度约为10.1 cm/s,拱腰和拱底的振动速度分别为8.9 cm/s和3.9 cm/s,拱顶、拱腰部位的最大振动速度大于水工隧洞的安全质点振动速度;此时隧洞最大的动拉应力点位于拱顶,为1.01 MPa,加上隧洞衬砌静态应力(约1.0 MPa),超过了C25砼的抗拉强度设计值1.27 MPa,故油罐车偶然爆炸会造成供水隧洞结构的破坏,影响其稳定性,须采取一定的交通管制措施。
The new highway tunnel goes through above the existed water supply tunnel to form crossing tunnels in space.The minimum clear distance between the upper and lower tunnels is 21.5m.A numerical simulation with ANSYS / LS-DYNA is conducted to evaluate the stability of the lower water supply tunnel by the accidental explosion of the upper highway tunnel.The results show that the vault and the haunch of the water supply tunnel have a great response on the explosive shock wave when the oil tank truck exploded on the upper highway tunnel in the process of transportation.The maximum vibration velocity is 10.1cm / s approximately,which is bigger than the safety vibration velocity of the hydraulic tunnel.The vibration velocities of the haunch and the arch bottom are 8.9cm / s and 3.9cm / s,respectively.The maximum dynamic tension stress is 1.01MPa in the vault of tunnel.With the addition of the lining static stress(about 1.0MPa) of the tunnel,the value surpasses the design tensile strength value of C25 concrete 1.27 MPa.Therefore,the accidental explosion of the oil tank truck can damage the structure of the water supply tunnel and have influence on its stability.It is necessary to take some traffic control measures.
The new highway tunnel goes through above the existed water supply tunnel to form crossing tunnels in space.The minimum clear distance between the upper and lower tunnels is 21.5m.A numerical simulation with ANSYS / LS-DYNA is conducted to evaluate the stability of the lower water supply tunnel by the accidental explosion of the upper highway tunnel.The results show that the vault and the haunch of the water supply tunnel have a great response on the explosive shock wave when the oil tank truck exploded on the upper highway tunnel in the process of transportation.The maximum vibration velocity is 10.1cm / s approximately,which is bigger than the safety vibration velocity of the hydraulic tunnel.The vibration velocities of the haunch and the arch bottom are 8.9cm / s and 3.9cm / s,respectively.The maximum dynamic tension stress is 1.01MPa in the vault of tunnel.With the addition of the lining static stress(about 1.0MPa) of the tunnel,the value surpasses the design tensile strength value of C25 concrete 1.27 MPa.Therefore,the accidental explosion of the oil tank truck can damage the structure of the water supply tunnel and have influence on its stability.It is necessary to take some traffic control measures.
引文
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[3]赵东平,王明年.小净距交叉隧道爆破振动响应研究[J].岩土工程学报,2007,29(1):116-119.(Zhao Dongping,Wang Mingnian.Study on influence of blasting vibration on cross tunnels with small clearance[J].Chinese Journal of Geotechnical Engineering,2007,29(1):116-119.(in Chinese))
[4]刘国华,王振宇.爆破荷载作用下隧道动态响应与抗爆分析[J].浙江大学学报,2004,38(2):204-209.(Liu Guohua,Wang Zhenyu.Dynamic response and blast-resistance analysis of a tunnel subjected to blast loading[J].Journal of Zhejiang University,2004,38(2):204-209.(in Chinese))
[5]林达明,尚彦军,柳侃.交叉隧道围岩收敛和应力分布规律研究[J].地下空间与工程学报,2012,8(6):1153-1158.(Lin Daming,Shang Yanjun,Liu Kan.Stress and displacement analysis of surround rock in Yshape tunnel[J].Chinese Journal of Underground Space and Engineering,2012,8(6):1153-1158.(in Chinese))
[6]钟冬望,吴亮,余刚.邻近隧道掘进爆破对既有隧道的影响[J].爆炸与冲击,2009,30(5):456-462.(Zhong Dongwang,Wu Liang,Yu Gang.Study of tunneling blasting on an existing adjacent tunnel[J].Explosion and Shock Waves,2009,30(5):456-462.(in Chinese))
[7]广东省水利电力勘测设计研究院.深圳市龙岗区沙荷路西段跨东深供水沙湾隧洞安全影响评价研究[R].广州:广东省水利电力勘测设计研究院,2013.(Guangdong Hydropower Planning&Design Institute.Safety evaluation and influence of lower water Supply tunnel by the excavation of upper highway tunnel in the Shahe west road,Shenzhen[R].Guangzhou:Guangdong Hydropower Planning&Design Institute.(in Chinese))
[8]Hsin Yu Low,Hong Hao.Reliability analysis of reinforced concrete slabs under explosive loading[J].Structural Safety,2001,23:157-178.
[9]阳生权,吕中玉,刘宝深.隧道围岩爆破地震累积效应研究[J].地下空间与工程学报,2007,3(增2):1451-1454.(Yang Shengquan,Lu Zhongyu,Liu Baochen.Study on blasting seismic cumulative effects of road tunnel and its surrounding rocks[J].Chinese Journal of Underground Space and Engineering,2007,3(Supp.2):1451-1454.(in Chinese))
[10]中华人民共和国标准.爆破安全规程(GB 6722-2011)[S].北京:中国标准出版社,2011.(Industrial Standards of the People’s Republic of China.Safety regulations for blasting(GB 6722-2011)[S].Beijing:Standard Press of China,2011.(in Chinese))
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