基于分布式光纤的单轴加载下岩石破裂过程试验研究
|
摘要
为研究砂岩在受力条件下的破坏过程,对砂岩进行了单轴多级加载试验。通过在岩石表面粘贴光纤传感光缆方式获得岩石加载过程中的应变参数,并结合应变量变化特征对砂岩岩芯进行了破裂过程试验研究。结果表明:加载初期,岩石破坏变化不明显,光纤无明显受力变化;随着加载压力的增大,岩石表面裂缝发育,对应的光纤应变量增大。单轴加载试验在一定程度上可以反映出岩石破裂过程中不同位置的受力变化,根据这一特点可对地下岩体稳定性的监测预警提供指导。
In order to study the failure process of sandstone under the stress condition,the single-axis multi-stage loading test was carried out on the sandstone.The strain parameters during the loading process were obtained by pasting the optical fiber sensor cable on the rock surface,and the fracture process test was conducted on the sandstone core by combining the variation characteristics of strain variables.The results show that the rock failure changes are not obvious at the initial stage of loading,and the fiber has no obvious force change.With the increase of loading pressure,the rock surface cracks develop and the corresponding fiber strain increases.The uniaxial loading test can reflect the change of the force at different positions during the rock rupture to a certain extent.According to this feature,it can provide reference and ideas for the monitoring and judgment of the stability of some underground rock masses.
In order to study the failure process of sandstone under the stress condition,the single-axis multi-stage loading test was carried out on the sandstone.The strain parameters during the loading process were obtained by pasting the optical fiber sensor cable on the rock surface,and the fracture process test was conducted on the sandstone core by combining the variation characteristics of strain variables.The results show that the rock failure changes are not obvious at the initial stage of loading,and the fiber has no obvious force change.With the increase of loading pressure,the rock surface cracks develop and the corresponding fiber strain increases.The uniaxial loading test can reflect the change of the force at different positions during the rock rupture to a certain extent.According to this feature,it can provide reference and ideas for the monitoring and judgment of the stability of some underground rock masses.
引文
[1]牛双建,靖洪文,杨大方,等.单轴压缩下破裂岩样强度及变形特征[J].采矿与安全工程学报,2015,32(1):112~119.
[2]范成凯,孙艳坤,李琦,等.页岩单轴压缩破坏试验的光纤布拉格光栅测试技术研究[J].岩土力学,2017,38(8):2456~2464.
[3]冯弟前,郑志琴,余贤斌.单轴多级加载下岩石声发射特性试验研究[J].中国锰业,2015,33(4):12~16.
[4]魏世明,柴静.岩石变形光纤光栅传感检测的应变传递分析[J].试验力学,2010,25(4):445~450.
[5]王彥琪,冯增朝,郭红强,等.基于图像检索技术的岩石单轴压缩破坏过程CT描述[J].岩土力学,2013(9):2534~2540.
[6]张茹,谢和平,刘建锋,等.单轴多级加载岩石破坏声发射特性试验研究[J].岩石力学与工程学报,2006,25(12):2584~2588.
[7]张丹.基于BOTDR的分布式光纤传感技术及其在工程健康监测中的应用研究[D].南京:南京大学,2004.
[8]叶宇宵,赵新铭,吴刚,等.分布式光纤在混凝土结构裂缝监测中的应用[J].土木建筑与环境工程,2018,40(1):24~29.
[9]李旭辉,黄奕辉.分布式光纤监测技术在土木结构健康监测中的应用[J].科技视界,2018(6)208~209,246.
[2]范成凯,孙艳坤,李琦,等.页岩单轴压缩破坏试验的光纤布拉格光栅测试技术研究[J].岩土力学,2017,38(8):2456~2464.
[3]冯弟前,郑志琴,余贤斌.单轴多级加载下岩石声发射特性试验研究[J].中国锰业,2015,33(4):12~16.
[4]魏世明,柴静.岩石变形光纤光栅传感检测的应变传递分析[J].试验力学,2010,25(4):445~450.
[5]王彥琪,冯增朝,郭红强,等.基于图像检索技术的岩石单轴压缩破坏过程CT描述[J].岩土力学,2013(9):2534~2540.
[6]张茹,谢和平,刘建锋,等.单轴多级加载岩石破坏声发射特性试验研究[J].岩石力学与工程学报,2006,25(12):2584~2588.
[7]张丹.基于BOTDR的分布式光纤传感技术及其在工程健康监测中的应用研究[D].南京:南京大学,2004.
[8]叶宇宵,赵新铭,吴刚,等.分布式光纤在混凝土结构裂缝监测中的应用[J].土木建筑与环境工程,2018,40(1):24~29.
[9]李旭辉,黄奕辉.分布式光纤监测技术在土木结构健康监测中的应用[J].科技视界,2018(6)208~209,246.