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金川矿区岩石具有显著流变性,开采难度极大,故对金川III矿区软弱复杂矿岩蠕变特性进行试验研究。蠕变试验采用RYL–600微机控制岩石剪切流变仪,蠕变加载方式采用分级增量循环加卸载,对试验数据分析时考虑加载历史对岩石试件变形的影响,真实地反映出岩石试件自身的流变力学行为,选取Burgers模型反映岩石的蠕变特性。结果表明:金川III矿区矿岩蠕变试验曲线与理论曲线基本吻合,Burgers蠕变模型能较好地描述岩石的蠕变特性。通过对金川III矿区5种岩样蠕变试验变形和破坏特征及破坏形态进行分析,表明特定条件下软弱复杂矿岩蠕变破坏形态复杂,但也有其规律性:岩样沿对角线方向一般有一个贯穿整个岩样的破坏面;同种岩样的破坏形式具有相似性。岩样破坏形式多样,同种岩样的破坏荷载差异性大。
The rocks in Jinchuan Mine area have significant rheology and are extremely difficult to mine. Therefore, the creep characteristics of soft and complex ores in Jinchuan Mine III are studied. Creep test using RYL-600 computer-controlled rock shear rheometer, creep loading method using incremental incremental cycle loading and unloading, the test data analysis to consider the loading history of the rock specimen deformation, a true reflection of the rock test Pieces of their own rheological mechanical behavior, select the Burgers model reflects the rock creep characteristics. The results show that the creep test curve of ores in Jinchuan III mine is in good agreement with the theoretical curve, and Burgers creep model can better describe the creep characteristics of rock. By analyzing the deformation and failure characteristics and the failure modes of creep tests of five samples in Jinchuan III mine area, it is shown that the creep and failure modes of the soft and complex ores are complex under certain conditions, but there are also regularities. The samples are generally diagonally oriented There is a failure surface that runs through the entire rock sample; similar forms of destruction are found in the same type of rock. Different types of rock samples are damaged, and the destructive loads of the same samples are quite different.