微波照射引起岩石抗冲击性能变化的试验研究

发布时间：2018-02-22 04:07

本文关键词： 微波照射岩石抗冲击性能落锤冲击电镜扫描　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：岩石破碎技术的研究是岩土工程及采矿工程中的重要课题之一。为了解决隧道掘进、深部采矿中岩石机械钻凿和破碎的高速高效问题,以实现“微波+机械”的新型破岩系统为目标,需探讨微波照射后岩石抗冲击性能的变化规律。这为微波辅助机械破碎岩石技术的应用提供理论依据,对微波辅助机械破碎岩石新技术、岩石破碎理论的发展和合理运用都具有十分重要的理论和现实意义。本文通过采用理论分析与试验研究相结合的方法,对微波照射后岩石抗冲击性能的变化进行了相关的研究。通过改变微波照射的功率、岩石种类、冲击荷载等参数,探究岩石在微波照射后其抗冲击性能的变化规律,并通过微波照射后岩石冲击断口电镜扫描试验对岩石产生损伤的原因进行分析验证,分析了微波照射后岩石抗冲击性能弱化的原因、岩石冲击裂纹的破坏特征及岩石冲击断裂过程。具体研究内容及取得成果如下:(1)通过分析了岩石不同矿物对微波加热的加热响应,探究了微波照射后岩石热破裂的基本原理以及微波照射后岩石抗冲击性能降低的原因,影响微波照射后岩石抗冲击性能变化的因素与岩石矿物组成成分,岩石种类,微波照射参数,岩石结构类型以及冲击荷载加载方式等有关。(2)采用自主改进的落锤冲击试验装置对微波照射后岩石的抗冲击性能进行试验,试验过程中,在微波照射时间一定的条件下改变微波照射功率,得到不同情况下三种岩石抗冲击性能弱化情况:在0-10kW范围内,微波照射功率越高岩石抗冲击性能弱化越明显,不同岩石在相同的试验条件下抗冲击性能弱化程度不同。(3)利用扫描电镜对微波照射后岩石冲击断口进行了扫描电镜试验,对三种岩石裂纹断口的形貌、微裂纹类型和微观断裂模型进行了研究,从细观的角度验证微波照射后岩石抗冲击性能弱化的原因,与落锤冲击试验结果的理论分析形成对比和论证。
[Abstract]:The research of rock crushing technology is one of the most important problems in geotechnical engineering and mining engineering. In order to realize the new rock breaking system of "microwave machinery", it is necessary to discuss the change law of rock impact resistance after microwave irradiation, which provides a theoretical basis for the application of microwave assisted mechanical rock crushing technology. The development and rational application of rock breakage theory are of great theoretical and practical significance to the new technology of rock crushing by microwave assisted mechanical crushing. In this paper, the method of combining theoretical analysis with experimental research is adopted. The change of rock impact resistance after microwave irradiation was studied. By changing the parameters of microwave irradiation, such as power, rock type, impact load and so on, the variation of rock impact resistance after microwave irradiation was studied. The causes of rock damage were analyzed and verified by scanning electron microscope (SEM) test of rock impact fracture after microwave irradiation, and the reason of weakening rock impact resistance after microwave irradiation was analyzed. The failure characteristics of rock impact crack and the rock impact fracture process. The specific research contents and results are as follows: 1) by analyzing the microwave heating response of different minerals in rock, The basic principle of rock thermal rupture after microwave irradiation and the reasons for the decrease of rock impact resistance after microwave irradiation are discussed. The factors affecting the change of rock impact resistance after microwave irradiation, the composition of rock minerals and the types of rock are discussed. The parameters of microwave irradiation, the type of rock structure and the loading mode of impact load are used to test the impact resistance of rock irradiated by microwave. Under the condition of changing microwave irradiation power under certain microwave irradiation time, three kinds of weakening conditions of rock impact resistance are obtained under different conditions: in the range of 0-10 kW, the higher the microwave irradiation power, the more obvious the weakening of rock impact resistance. Different rocks have different weakening degree of impact resistance under the same test conditions.) SEM was used to test the impact fracture surface of rock after microwave irradiation, and the fracture morphology of three kinds of rock cracks was studied. The microcrack types and microfracture models were studied, and the reasons for the weakening of rock impact resistance after microwave irradiation were verified from the view of meso, and compared with the theoretical analysis of the impact test results of drop weight.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU45

【参考文献】