摘要
为提取破碎带、溶洞等隧道不良地质体的地质雷达剖面特征,达到提高地质雷达(GPR)隧道超前预报结果准确性的目的,采用二维时域有限差分法,设计隧道环境下的水平破碎带、倾斜破碎带、空腔溶洞和含水溶洞的4种理论模型,正演模拟其雷达剖面记录。通过安江高速公路3个岩溶隧道GPR探测典型实例结果,证明了本次正演模拟结果的有效性。研究结果表明:GPR在短距离内识别破碎带、溶洞等不良地质体的位置和水平发育情况上效果比较明显,而对于不良地质体垂直发育情况以及倾斜角度方面存在一定的局限性。因此,以详细的工作面地质素描为基础,利用隧道不良地质体雷达剖面特征对实测GPR资料进行分析,可以获得较好的超前预报结果。
To improve the accuracy of advanced geological prediction for tunnels by Ground Penetrating Radar( GPR),the GPR profiles of bad geological bodies( including horizontal fracture zone,inclined fracture zone,cavity and karst cave) were extracted by forward simulation in two-dimensional finite difference time-domain models.Case study on three karst tunnels of Anjiang Highway demonstrated the effectiveness of the forward simulation result. The result revealed that GPR is of obvious efficiency in identifying the location and horizontal development of fracture zone and karst cave,but has some limitations for vertical development and tilt angle of bad geological bodies. In conclusion,satisfactory result of advanced prediction can be obtained by analyzing measurement data through GPR profile based on detailed geological sketch.
出处
《长江科学院院报》
CSCD
北大核心
2018年第3期92-96,共5页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学青年基金项目(41202223
51409013)
国家重点研发计划项目(2017YFC1501200
2017YFC1502600)
关键词
隧道
超前地质预报
地质雷达
不良地质体
溶洞
破碎带
tunnel
advanced tunnel prediction
geological radar
bad geological bodies
karst cave
fracture zone
作者简介
周黎明（1977-）,男,吉林辉南人,教授级高级工程师,博士,主要从事岩土工程地球物理技术方面的研究工作.E-mail：brian5396@126.com
