爆破动载对新喷混凝土影响的模型试验研究

发布时间：2018-02-25 18:18

本文关键词： 爆破动载新喷混凝土模型试验强度损伤　出处：《中国矿业大学（北京）》2014年博士论文　论文类型：学位论文

【摘要】：本文借助大比例模型试验，研究和分析了爆破动载对新喷射混凝土的影响。利用相似理论，，建立了物理模型试验的相似准则，并研制了相似模拟材料，系统设计模型试验方案；通过预埋试件拉拔法检测模拟喷射混凝土薄层的强度，辅以电阻应变测试，从不同龄期、距掌子面不同距离、同一断面的不同位置这三个方面，分析了爆破动载对新喷射混凝土强度的影响；运用声波测试技术对喷射混凝土爆破损伤效应进行分析研究，根据试验结果，建立了喷射混凝土声波速度降低率与其爆破损伤之间的定量关系，得到了喷射混凝土受爆破振动后的损伤及其累积值。分析了喷射混凝土的声速、爆破损伤与爆破次数之间存在的统计关系，并给出了喷射混凝土声速、爆破损伤随爆破次数增加的变化规律。
[Abstract]:In this paper, the influence of blasting dynamic load on new shotcrete is studied and analyzed with the help of large scale model test. By using similarity theory, the similarity criterion of physical model test is established, and the similar simulation material is developed, and the model test scheme is designed systematically. The tensile strength of the simulated shotcrete thin layer is measured by the method of drawing the embedded specimen, supplemented by the resistance strain test, from three aspects: different ages, different distances from the face of the palm, and different positions of the same section. The effect of blasting dynamic load on the strength of new shotcrete is analyzed, and the damage effect of shotcrete blasting is studied by using acoustic wave test technique. The quantitative relationship between the rate of sonic velocity reduction and blasting damage of shotcrete is established, and the damage and its accumulative value after blasting vibration are obtained, and the sound velocity of shotcrete is analyzed. The statistical relation between blasting damage and blasting number is given, and the variation law of sonic velocity and blasting damage with blasting times is given.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU528.53

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