微波辐射对变粒岩孔隙结构及抗拉强度的影响

为了揭示微波辐射下变粒岩的损伤规律，对丹银矿业有限公司含金矿体变粒岩开展了微波辐射实验.结果表明:局部高温熔化区为铁元素富集区，熔化区内部产生大量孔洞，孔径可达0.11mm，熔化区外围附近形成明显的宏观裂纹和密集的微观裂隙网状结构;随距高温区距离的增加，微观裂隙明显减少，孔隙度逐渐降低;随微波辐射时间的增加，抗拉强度及损伤增量不断降低;微波辐射后岩石抗拉强度取决于裂隙分布及熔化区强度和范围.研究结果对优化微波辐射时间，提高微波辐射致裂效率有重要意义.

Effect of Microwave Radiation on Pore Structure and Tensile Strength of Metagranulite

In order to reveal the damage law of metagranulite under microwave radiation， the microwave radiation experiments were carried out on metagranulite of gold-bearing ore body from Danyin Mining Co.， Ltd.. The results show that the localized high-temperature melting zone is an iron-rich zone，where a large number of pores formed with pore size up to 0.11mm.Obvious macro cracks and dense micro-fracture networks can be observed near the periphery of the melting zone. With the increase of the distance away from the high temperature zone， the microscopic cracks are obviously reduced， and the porosity gradually decreases. As the microwave radiation time increases， the tensile strength and damage increment decrease continuously. The tensile strength of the rock after microwave radiation depends on the distribution of cracks and the strength and range of the melting zones. The results are of great significance for optimizing the microwave radiation time and improving the efficiency of the microwave radiation cracking.