【摘要】 为研究微波处理对含水岩石的损伤机制,采用2.45 GHz多模谐振腔对赤峰玄武岩、北山花岗岩和昆明砂岩这3种岩石进行了干燥和浸水岩石的微波加热试验,通过P波波速和单轴压缩强度评价微波处理对干燥和浸水岩石的损伤特性。结果表明:岩石种类不同,水分对微波处理后岩石的升温特性、P波波速和单轴压缩强度的影响也不相同;赤峰玄武岩含水量较少,对升温特性和波速影响较小;北山花岗岩和昆明砂岩为弱微波吸收类岩石,水分对升温速率和波速的影响较大,对强度的影响较小,这是由于微波先把岩石内的水分蒸发掉再和岩石反应,导致干燥岩石和浸水岩石的强度基本一致。更多还原

【Abstract】 The technology of microwave-induced fracturing of rock is considered to be a very promising auxiliary mechanical rock breaking technology and deep rock mass stress-release technology, which is of great significance to the construction efficiency of underground engineering and the safety of deep engineering construction. Because water can affect the microwave absorption capacity of rock and the mechanical properties of rock, and the rock at the engineering site contains a certain amount of water, it is very important to study the damage mechanism of microwave treatment on water-bearing rock. Microwave heating experiments were carried out on three rocks of Chifeng basalt, Beishan granite and Kunming sandstone using a 2.45 GHz multimode resonator. The damage characteristics of microwave treatment on dry and soggy rocks were evaluated by P-wave velocity and uniaxial compression strength. The results show that the rock type is different, and the effect of water on the temperature rise characteristics, P-wave velocity and uniaxial compressive strength of the rock after microwave treatment is also different. The Chifeng basalt has less water content and has less influence on the heating characteristics and wave velocity. Beishan granite and Kunming sandstone are weak microwave absorbed rocks, and the influence of water on heating rate and wave velocity is large, and the effect on strength is small. This is because the microwave first evaporates the water in the rock and then reacts with the rock, resulting in the same strength of dry rock and soggy rock.更多还原