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页岩变形过程中表面红外辐射演化规律探究

Study on the Evolution Law of Infrared Radiation on the Surface during Shale Deformation

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【作者】 杨少强杨栋王国营陈达常张洁莹

【Author】 Yang Shaoqiang;Yang Dong;Wang Guoying;Chen Dachang;Zhang Jieying;Mining Technology Research Institute,Taiyuan University of Technology;Baise Baikuang Group Co. Ltd.;

【机构】 太原理工大学采煤工艺研究所百色百矿集团有限公司

【摘要】 为探寻含裂隙岩体变形失稳过程中表面红外辐射演化规律,对沉积类岩石油页岩内部原生孔隙裂隙进行CT扫描定位,以单轴压缩过程中红外监测实验为例证,探究其表面红外辐射温度演化规律,并以表面辐射最高温度、平均温度及变异系数三个统计量为指标进行分析。结果表明:(1)不同于花岗岩、大理岩、砂岩等完整岩石单轴压缩过程中表面温度随应力增加表现为上升现象,含孔隙、裂隙岩石油页岩表面温度随应力增加则表现为下降;但临近试件发生破坏,二者均会产生温度陡然升高的现象;(2)平均温度与最高温度曲线具有共性特征,随载荷增加,二者表现出明显的阶段性,即快速下降阶段-缓慢下降阶段-快速上升阶段,且最高温度曲线临近破坏具有更高的敏感性;(3)变异系数曲线可以较好地反应试件表面辐射温度离散程度,随应力增加,首先表现为快速增长,随后进入相对稳定期,临近破坏时刻再次出现快速增长;稳定期后变异系数曲线的快速增长预示岩石破坏;(4)油页岩变形失稳过程中表面温度下降与其内部气体逸出及孔隙、裂隙坍塌破坏相关。原生裂隙在加载初期表现为温度降低,临近破坏时该区域则转变为升温区。该研究为预测沉积类岩体特别是含有天然裂隙岩体变形失稳过程中表面红外辐射变化规律提供了新的内容。

【Abstract】 In order to explore the evolution of the surface infrared radiation during the deformation and instability of the fractured rock mass,the CT scanning of the primary pore fissure in the sedimentary rock oil shale was carried out. The infrared radiation temperature evolution law of the rock surface was investigated by the infrared monitoring experiment in the process of uniaxial compression,and three statistics of surface radiation maximum temperature,mean temperature and variation coefficient were used as indicators. The results show that: 1.Unlike granite,marble,sandstone and other intact rocks under uniaxial compression,the surface temperature increases with the increase of stress,while the surface temperature of oil shale with pores and fractures decreases with the increase of stress.However,when the specimen is nearby destroyed,the temperature rises sharply in both cases. 2. The average temperature and the highest temperature curves have common characteristics, the two show obvious stages characteristic with the increase of the load,that is,the rapid descent stage-the slow descent stage-the rapid rise stage.The highest temperature curve has higher sensitivity the damage.3. The variation coefficient curve can better reflect the dispersion of surface radiation temperature of the specimen. With the increase of stress,it first shows rapid growth,then enters the relative stability period,and the rapid growth near the time of failure.The rapid growth of the variation coefficient curve after the stable period forebodes the rock destruction. 4. The decrease of surface temperature during the destabilization of oil shale is related to the internal gas escaping and the collapse of pores and fractures.The primary fracture appears to be a decreasing zone in loading,and it changes to a warming zone near failure. This study provides a new content for predicting the infrared radiation changes of sedimentary rock mass,especially in the process of deformation and instability of naturally fractured rock mass.

【基金】 国家自然科学基金(51704206,U1261102,51374257)
  • 【文献出处】 地下空间与工程学报 ,Chinese Journal of Underground Space and Engineering , 编辑部邮箱 ,2019年01期
  • 【分类号】TU45
  • 【下载频次】203
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