水岩作用下露天矿蚀变岩石力学试验研究  

Study on mechanics test of altered rock under water-rock interaction in surface mine

作　　者：冯佰研 秦哲[1,2] 牛传星 付厚利[1,3] 亓伟林 

机构地区：[1]山东科技大学,山东青岛266590 [2]山东省防灾减灾重点实验室,山东青岛266590 [3]临沂大学,山东临沂276000

出　　处：《煤炭科学技术》2016年第3期39-43,105,共6页Coal Science and Technology

摘　　要：为了探究水位升降对边坡稳定性的影响,选取莱州仓上露天矿坑边坡蚀变岩样,对不同饱水-失水循环次数的蚀变岩进行了三轴压缩试验。通过探究各力学参数的变化规律,建立了函数关系描述蚀变岩的力学性质受水岩循环作用影响的变化形式,引入损伤率概念分析了循环次数对蚀变岩力学性质的影响。结果表明:相同饱水-失水循环次数下,蚀变岩极限抗压强度随围压增大而提高;不同循环次数下,蚀变岩黏聚力随次数增加衰减迅速,并呈持续衰减状态,内摩擦角损伤较弱;随蚀变、碎裂程度增加,水岩作用对岩石的各项力学性质损伤不断增加,黏聚力损伤率可达70%,内摩擦角损伤率可达30%;水岩作用对蚀变岩力学性质的影响主要体现在黏聚力降低方面,水位升降时蚀变岩黏聚力变化对边坡稳定性有较大影响。In order to explore a water table fluctuation affected to the slope stability,altered rock samples were taken from the slope in Laizhou Cangshang Surface Mine,triaxial compression tests were conducted on the altered rock with different water saturation-dehydration circulation times. With the exploration on the variation law of each mechanics parameter,a function relation established was applied to explain the mechanics property variation mode of the altered rock affected by the water-rock circulation interaction and the damage probability conception introduced was applied to analyze the circulation times affected to the mechanics property of the altered rock. The results showed that under the same water saturation-dehydration circulation times,the ultimate compressive strength of the altered rock would be increased with the surrounding rock pressure increased. Under the different circulation times,the cohesion force of the altered rock would be rapidly decreased with the circulation times increased,and would be in a sustained decreasing status.The damage of the internal friction angle and would be weak. With the alteration and broken degree increased,the water-rock interaction damaged to each mechanics property of the rock was continuously increased,the cohesion force damage rate was up to 70% and the damage rate of the internal friction angle was up to 30%.The water-rock interaction affected to the mechanics property of the altered rock mainly would be the cohesion force reduction and the cohesion force variation of the altered rock would have high influences to the slope stability when the water table was fluctuated.

关 键 词：水岩作用 蚀变岩 三轴压缩试验 岩石损伤规律 

分 类 号：TD313[矿业工程—矿井建设]