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| TESTING STUDY OF CREEP CHARACTERISTIC AND FAILURE MODE OF SOFT ROCKS AT JINCHUAN MINE |
| WANG Weiwei1,WANG Wenxing2 |
| (1. Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;2. School of Resources and Safety Engineering,Central South University,Changsha,Hunan 410083,China) |
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Abstract 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。
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Received: 19 May 2013
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