爆破地震波作用下直墙拱形隧洞围岩质点振速响应特征研究

发布时间：2018-08-19 05:58

【摘要】：根据直墙拱形隧洞爆破振动速度的现场监测数据,文章分析了邻近岩体爆破开挖诱发的隧洞围岩质点振动速度分布规律。在此基础上,采用数值模拟方法研究了在爆破P波作用下邻近隧洞围岩的质点振动速度的缩放效应并分析了其主要影响因素,对比分析了振动速度缩放效应与动应力集中效应的差异。计算结果表明,在P波作用下直墙拱形隧洞靠近振源一侧围岩的质点振动速度大于振源振动速度,而另一侧质点振动速度则小于振源振动速度,围岩质点振速较大的区域的动应力集中系数较低,而围岩质点振速较小区域的动应力集中系数较高。
[Abstract]:Based on the field monitoring data of blasting vibration velocity of straight wall arch tunnel, the distribution law of surrounding rock mass vibration velocity induced by blasting excavation in adjacent rock mass is analyzed in this paper. On this basis, the scaling effect of particle vibration velocity of adjacent tunnel surrounding rock under the action of blasting P wave is studied by numerical simulation method, and the main influencing factors are analyzed. The difference between vibration velocity scaling effect and dynamic stress concentration effect is compared and analyzed. The calculated results show that the particle vibration velocity of the arched tunnel near one side of the vibration source is larger than that of the vibration source under the action of P-wave, while the vibration velocity of the other side is smaller than that of the vibration source. The coefficient of dynamic stress concentration is lower in the region with larger particle velocity of surrounding rock and higher in the region with smaller vibration velocity of surrounding rock.
【作者单位】：中国地质大学(武汉)工程学院;北京城建勘测设计研究院有限责任公司;中铁二院重庆勘察设计研究院有限责任公司;
【基金】：重庆市科技计划项目(cstc2014yykf B30003) 国家自然科学基金项目(51379194,41102196)
【分类号】：U451.2

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