基于声发射定位的三轴受压帷幕体试样裂隙演化分析
发布时间：2019-01-22 18:56
【摘要】：利用TAW-3000电液伺服岩石三轴试验机和PCI-II声发射监测系统对以研山铁矿东帮卵石制作的帷幕体试块进行不同围压三轴压缩条件下的声发射(AE)测试,结合声发射空间定位、AE事件能率对不同应力阶段帷幕体裂隙空间演化规律进行了分析,并对分形维数的变化规律进行了研究。试验结果表明:围压越大,帷幕体试块的抗压强度越高,到达峰值荷载所用时间越多,对应的时间-应力曲线的曲线上升段越长、曲率越小,帷幕体塑性特征越明显,累计AE定位点数越多。分形维数变化基本特征为升维、降维、再升维模式。AE事件能率和定位点数骤然增多以及二次升维标志破坏前兆。同样的应力状态下帷幕体内卵石和砂浆的结合面先起裂,其次是砂和水泥浆的结合面开裂,最后裂缝进入硬化水泥浆。
[Abstract]:The TAW-3000 electro-hydraulic servo rock triaxial testing machine and the PCI-II acoustic emission monitoring system were used to test the acoustic emission (AE) of the curtain block made from the east side pebble of Yanshan Iron Mine under different confining pressure triaxial compression conditions. Combined with acoustic emission spatial location, AE event energy rate is used to analyze the evolution law of the crack space of curtain body at different stress stages, and the variation law of fractal dimension is studied. The test results show that the higher the confining pressure, the higher the compressive strength of the curtain, the more time it takes to reach the peak load, the longer the rising section of the corresponding time-stress curve is, and the smaller the curvature is, the more obvious the plastic characteristics of the curtain body are. Cumulative AE positioning points more. The basic characteristics of fractal dimension change are ascending dimension, reducing dimension and reraising dimension pattern. AE event energy rate and location number increase suddenly, and the sign of secondary dimension elevation destroys precursor. Under the same stress state, the bonding surface of pebble and mortar in the curtain begins to crack first, then the joint surface of sand and cement slurry cracks, and finally the crack enters into the hardened cement slurry.
【作者单位】： 华北理工大学矿业工程学院;河北省矿业开发与安全工程实验室;
【基金】：河北省自然科学基金项目(编号:E2015209260) 唐山市科技计划项目(编号:13130239z)
【分类号】：TD31
[Abstract]:The TAW-3000 electro-hydraulic servo rock triaxial testing machine and the PCI-II acoustic emission monitoring system were used to test the acoustic emission (AE) of the curtain block made from the east side pebble of Yanshan Iron Mine under different confining pressure triaxial compression conditions. Combined with acoustic emission spatial location, AE event energy rate is used to analyze the evolution law of the crack space of curtain body at different stress stages, and the variation law of fractal dimension is studied. The test results show that the higher the confining pressure, the higher the compressive strength of the curtain, the more time it takes to reach the peak load, the longer the rising section of the corresponding time-stress curve is, and the smaller the curvature is, the more obvious the plastic characteristics of the curtain body are. Cumulative AE positioning points more. The basic characteristics of fractal dimension change are ascending dimension, reducing dimension and reraising dimension pattern. AE event energy rate and location number increase suddenly, and the sign of secondary dimension elevation destroys precursor. Under the same stress state, the bonding surface of pebble and mortar in the curtain begins to crack first, then the joint surface of sand and cement slurry cracks, and finally the crack enters into the hardened cement slurry.
【作者单位】： 华北理工大学矿业工程学院;河北省矿业开发与安全工程实验室;
【基金】：河北省自然科学基金项目(编号:E2015209260) 唐山市科技计划项目(编号:13130239z)
【分类号】：TD31
【参考文献】
相关期刊论文 前10条
1 王志国;王梅;李跃龙;;基于声发射定位的单轴受压帷幕体裂隙演化分析[J];金属矿山;2016年02期
2 夏冬;常宏;;中关铁矿堵水帷幕模型的建立及其稳定性分析[J];金属矿山;2015年12期
3 吴贤振;刘祥鑫;梁正召;游勋;余敏;;不同岩石破裂全过程的声发射序列分形特征试验研究[J];岩土力学;2012年12期
4 艾婷;张茹;刘建锋;赵小平;任利;;三轴压缩煤岩破裂过程中声发射时空演化规律[J];煤炭学报;2011年12期
5 左建平;裴建良;刘建锋;彭瑞东;李岳春;;煤岩体破裂过程中声发射行为及时空演化机制[J];岩石力学与工程学报;2011年08期
6 孙辉;王在泉;吴净洁;崔洋;;灰岩注浆帷幕体渗透特性的试验研究[J];地下空间与工程学报;2009年05期
7 尹贤刚;李庶林;唐海燕;裴建良;;岩石破坏声发射平静期及其分形特征研究[J];岩石力学与工程学报;2009年S2期
8 张省军;唐春安;王在泉;;矿山注浆堵水帷幕稳定性监测方法的研究与进展[J];金属矿山;2008年09期
9 高建军;祝瑞勤;徐大宽;;岩溶充水矿床帷幕注浆堵水技术研究[J];水文地质工程地质;2007年05期
10 雷兴林;西l⑿，
本文编号：2413472
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2413472.html
