考虑损伤效应深部锚固巷道蠕变破坏模拟分析  

Simulation analysis on creep failure of deep bolting roadways considering the effect of damage

作　　者：赵同彬[1,2] 张玉宝[1] 谭云亮[1] 刘姗姗[1] 尹延春[1] 

机构地区：[1]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590 [2]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《采矿与安全工程学报》2014年第5期709-715,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51004068);山东省优秀中青年科学家科研奖励基金项目(BS2011NJ014);山东科技大学杰出青年科学基金项目(2011KYJQ106);山东省"泰山学者"建设工程专项经费项目

摘　　要：首先通过深部泥岩数字散斑蠕变试验,发现分级加载第Ⅰ阶段泥岩试件表面变形集中现象明显,表明该岩体在较低应力水平开始出现损伤,并随着载荷级别增加,逐渐演化为一条剪切破裂带,直至整个试件发生破坏;然后引入损伤变量Dt,建立考虑损伤效应的加锚岩体非线性BKS蠕变损伤模型,采用FISH函数编制程序实现其在FLAC3D中的开发;最后采用BKS蠕变损伤模型对口孜东矿锚固围岩支护控制进行数值模拟。结果表明:深部岩体的损伤特性增大了蠕变破坏区范围,且在锚固范围外仍出现蠕变破坏,深部围岩内部非连续性破裂现象明显。同时将模拟结果与现场钻孔探测结果进行对比分析,证实了数值模拟研究中考虑损伤效应更能客观地反映深部岩体的蠕变破坏特征,对深部巷道破坏机理研究有指导意义。From creep experiments of deep mudstones in digital speckle method, the phenomenon of deformation concentration that occurs in the surface of specimen is obvious under the first step loading. And it indicates that the damage begin to appear in rock mass under the relatively low stress level. With the increasing of loading level, a shear fracture band is formed until the whole specimen failure. Then the BKS model which can reflect rock damage effect is put forward by introducing damage variable Dt . By using FISH function, the model’s program composition is realized in the FLAC3D. Finally, the model is applied to simulating the bolting surrounding rock control in Kouzidong mining area. The result shows that creep failure zone increases and occurs beyond the anchorage range due to the damage char-acteristics, and non-continuity failure is obvious during deep surrounding rock. Meanwhile, it is con-firmed that the numerical simulation considering damage effect can objectively reflect the creep failure characteristics of deep rock mass by contrasting simulated results with detection results of field borehole.Consequently, there is a guiding significance for the research on failure mechanism of deep roadways.

关 键 词：深部岩体 锚固巷道 损伤效应 蠕变破坏 数字散斑 

分 类 号：TD325[矿业工程—矿井建设]