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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第44卷

期数:

2022年第06期

页码:

1048-1065

栏目:

纪念刘国昌先生诞辰110周年专辑

出版日期:

2022-11-15

文章信息/Info

Title:

Detection Method of Buried Depth of Single Crack in Rock Mass Based on Thermal Infrared Response

文章编号:

1672-6561(2022)06-1048-18

作者:

吕洪涛¹; 包 含^1*; 兰恒星²; 3; 李 黎⁴; 陈卫昌⁴; 晏长根¹; 张景峰¹

(1. 长安大学 公路学院, 陕西 西安 710064; 2. 长安大学 地质工程与测绘学院,陕西 西安 710054; 3. 中国科学院地理科学与资源研究所 资源与环境信息系统国家重点实验室,北京 100101; 4. 中国文化遗产研究院,北京 100029)

Author(s):

LYU Hong-tao¹;  BAO Han^1*;  LAN Heng-xing²; 3;  LI Li⁴;  CHEN Wei-chang⁴;  YAN Chang-gen¹;  ZHANG Jing-feng¹

(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 3. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 4. China Academy of Cultural Heritage, Beijing 100029, China)

关键词:

岩体裂隙;  埋藏深度;  传热特性;  热激励;  红外热成像;  无损探测;  热流密度;  裂隙直径

Keywords:

crack of rock mass;  buried depth;  heat transfer characteristic;  thermal excitation;  infrared thermal imaging;  nondestructive detection;  heat flux density;  diameter of crack

分类号:

P642.3; TU45

DOI:

10.19814/j.jese.2022.05013

文献标志码:

A

摘要:

探测岩体内部裂隙的埋藏深度是揭示岩体内部结构状态的重要环节。基于一维热传导理论,提出了一种通过岩体表面温差获取裂隙埋藏深度的探测方法,并结合室内试验和数值模拟分析了热流密度、裂隙直径、裂隙埋藏深度对含单裂隙岩体传热特性及裂隙埋藏深度探测结果的影响。结果表明:裂隙对岩体中的热流传递造成了阻碍,利用红外热成像技术可以有效识别直径较大、埋藏深度较浅的内部裂隙; 裂隙投影区与完整岩石表面温差受热流密度、裂隙埋藏深度和裂隙直径的影响,热流密度较大,识别效果较好,且加热过程中最大温差与热流密度、裂隙直径成线性关系,与裂隙埋藏深度成对数正态分布关系; 裂隙埋藏深度的计算误差主要受加热时间的影响,当加热时长为计算深度变化率最小值所对应时刻时,产生的误差较小,模拟试验中的最小误差仅为0.6%; 使用2 000 W?m^-2的热流密度,加热20 min可探测埋藏深度为6 cm内的裂隙,延长加热时间和增大加热功率均可提升裂隙埋藏深度的探测能力。因此,利用红外热成像技术探测浅层裂隙埋藏深度具有较高的可行性,对于岩体结构敏感性较强、有特殊使用需求的岩体工程将体现重要的应用价值。

Abstract:

Detecting the buried depth of cracks is an important link to reveal the internal structural state of rock mass. Based on the one-dimensional heat conduction theory, a detection method to obtain the buried depth of cracks through the surface temperature difference of rock mass was proposed, and the influences of heat flux density, diameter and buried depth of crack on the heat transfer characteristics and buried depth detection of rock mass with single crack were analyzed by laboratory tests and numerical simulation. The results show that the cracks hinder the heat flow transfer in rock mass, and the internal cracks with large diameter and shallow buried depth can be effectively identified by infrared thermal imaging technology; the surface temperature difference between the projection area of crack and intact rock is affected by heat flux density, buried depth and diameter of crack; the heat flux density is large, and the identification effect is good; the maximum temperature difference in the heating process is linear with the heat flux density and diameter of crack, and logarithmic normal distribution with buried depth of crack; the calculation error of buried depth of crack is mainly affected by heating time, when the heating time is the moment corresponding to the minimum value of the calculation depth change rate, the error is smaller, and the minimum error in the simulation test is only 0.6%; the cracks within the buried depth of 6 cm can be detected by heating for 20 min with the heat flux density of 2 000 W·m^-2, and the detection for buried depth of crack can be improved by extending heating time and increasing heating power. Therefore, it is feasible to detect the buried depth of shallow cracks by infrared thermal imaging technology, which will have important application for rock mass engineering with strong structural sensitivity and special use requirements.

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备注/Memo

备注/Memo:

收稿日期:2022-05-09
基金项目:国家重点研发计划项目(2019YFC1520601); 国家自然科学基金项目(42177142,42041006,41941019); 中央高校基本科研业务费专项资金项目(300102212213)
作者简介:吕洪涛(1996-),男,湖北襄阳人,工学硕士研究生,E-mail:353235188@qq.com。
*通讯作者:包 含(1988-),男,河南商丘人,教授,博士研究生导师,工学博士,E-mail:baohangeo@163.com。

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