隧道竖向爆破振动下二层砌体房屋动力反应

发布时间：2018-03-24 06:11

本文选题：爆破振动　切入点：砌体结构　出处：《土木工程学报》2015年S1期

【摘要】：以成渝高铁新红岩隧道工程为例,测试采用非电雷管和电子雷管爆破时的振动波并对比分析爆破地震波特性;选择一栋二层砌体房屋,建立砌体结构有限元模型,分析不同峰值振速下结构的位移、砌体不同局部构件上的主拉应力特征。结果表明:采用电子雷管相比非电雷管爆破能够有效降低峰值振速;砌体结构的位移从下往上逐渐增大,二层前端女儿墙的位移最大,峰值振速6.0cm/s时女儿墙位移为2.30mm,层间位移角为1/3044,层间位移角限制不适用于爆破振动下房屋安全评价;在高频爆破振动下,结构损伤主要受到应力控制,而不是位移;房屋的门角、女儿墙和中隔墙上的应力水平较高,纵墙上的主拉应力水平最低;隧道爆破振动下,门角等应力集中部位是结构最容易损伤的部位,其次女儿墙和中隔墙在峰值振速较大时也会发生损伤,纵墙不会发生损伤。
[Abstract]:Taking Xinhongyan tunnel project of Chengdu-Chongqing high-speed railway as an example, the vibration wave of blasting with non-electric detonator and electronic detonator is tested and the characteristics of blasting seismic wave are compared and analyzed, and a finite element model of masonry structure is established by selecting a two-story masonry building. The displacement of the structure under different peak vibration velocities and the main tensile stress characteristics on different local members of masonry are analyzed. The results show that the electronic detonator can effectively reduce the peak vibration velocity compared with the non-electric detonator blasting. The displacement of masonry structure increases gradually from the bottom up, the displacement of the two-story front end parapet is the largest, the displacement of the parapet is 2.30mm when the peak vibration velocity is 6.0cm/s, and the displacement angle of the floor is 1 / 3044. the limitation of the displacement angle is not suitable for the safety evaluation of the building under blasting vibration. Under high frequency blasting vibration, the structural damage is mainly controlled by stress, not displacement; the stress level of the door angle, parapet wall and middle partition wall is higher, and the main tensile stress level of longitudinal wall is the lowest; under tunnel blasting vibration, the main tensile stress level is the lowest. The stress concentration position such as the door angle is the most easily damaged part of the structure. Secondly the parapet wall and the middle partition wall will also be damaged when the peak vibration velocity is larger and the longitudinal wall will not be damaged.
【作者单位】：北京交通大学;
【基金】：国家自然科学基金项目(51278042);国家自然科学基金项目(L1222021)
【分类号】：U455.6;TU311.3

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