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以色列考古学家在以色列拿撒勒以北的村庄发现了公元66年至70年间建成的地下设施,包括地下隧道和地下室。据称,这是当时的犹太人为躲避罗马人进攻而建造的。考古学家说,当时的犹太人在地下设施中储备了生活物资,准备躲开罗马人的进攻,由短地道彼此相连的地下室可以成为地下秘密住所。这些地下室下宽上窄,高度不足以让人站直行走,连接它们的地道非常短。此前人们认为, 相似文献
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徐云雷 《烟台职业学院学报》2021,(4):77-82
富含水地层的防水施工是隧道工程的重难点,如果防水质量不符合要求,就会造成隧道出现渗漏水,造成重大工程安全质量隐患.以杭州下沙路与12号路提升改造项目地下隧道工程实例,研究富含水地质条件下隧道防水施工技术.项目以做好防水混凝土施工前提,通过引进新型APF防水卷材,采用预铺反粘创新技术,将APF防水卷材与隧道结构进行有效黏... 相似文献
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轴向漏泄电缆在地下隧道中电磁波传输特性研究 总被引:1,自引:0,他引:1
李继生 《天津工程师范学院学报》2005,15(1):27-29
对圆形隧道中含有轴向漏泄电缆的电磁波传输特性进行分析,给出了相应的单、双波模的波模方程,并且采用Muller法对其进行求解。得出如下结论:在含有纵向导线的隧道中,电缆距离隧道壁越近,损耗层越大,单线波模衰减率越大;电缆内导体的电导率越大,双线波模衰减率越小;随着屏蔽层传递电感值的增加,损耗层对衰减率影响加大。 相似文献
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LI Xiudi ZHENG Yingren 《天津大学学报(英文版)》2006,12(B09):177-181
In order to define the loading on protective doors of an underground tunnel, the exact knowledge of the blast propagation through tunnels is needed. Thirty-three scale high-explosive tests are conducted to obtain in-tunnel blast pressure for detonations external, internal and at the tunnel entrance. The cross section of the concrete model tunnel is 0.67 m^2. Explosive charges of TNT, ranging in mass from 400 g to 4 600 g, are detonated at various positions along the central axis of the model tunnel. Blast gages are flush-installed in the interior surface of the tunnel to record side-on blast pressure as it propagates down the tunnel. The engineering empirical formulas for predicting blast peak pressure are evaluated, and are found to be reasonably accurate for in-tunnel pressure prediction. 相似文献
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Transient response of a spherical cavity with a partially sealed shell embedded in viscoelastic saturated soil 总被引:1,自引:0,他引:1
INTRODUCTION The propagation of stress-waves in an elasticmedium containing a cavity that are due to arbitrarydynamic loading applied on the cavity is of greatimportance in the fields of seismology, geophysicalprospecting, underground tunnels and deeply buriedpipelines, particularly as a model of an earthquakesource. Ben-Menahem and Cisternas (1963) devel-oped the theory for the dynamic response of an elastichalf-space medium to an explosion spherical cavity.Norwood and Miklowitz (… 相似文献
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