张兴洲,尹维民,姚敏,等. 物探技术在高铁隧道超前预报中的应用[J]. 华北地震科学,2020, 38(S1):54-58. doi:10.3969/j.issn.1003−1375.2020.S1.012.
引用本文: 张兴洲,尹维民,姚敏,等. 物探技术在高铁隧道超前预报中的应用[J]. 华北地震科学,2020, 38(S1):54-58. doi:10.3969/j.issn.1003−1375.2020.S1.012.
ZHANG Xingzhou,YIN Weimin,YAO Min,et al. Application of Geophysical Prospecting Technology in Advance Prediction of High Speed Railway Tunnel[J]. North China Earthquake Sciences,2020, 38(S1):54-58. doi:10.3969/j.issn.1003−1375.2020.S1.012.
Citation: ZHANG Xingzhou,YIN Weimin,YAO Min,et al. Application of Geophysical Prospecting Technology in Advance Prediction of High Speed Railway Tunnel[J]. North China Earthquake Sciences,2020, 38(S1):54-58. doi:10.3969/j.issn.1003−1375.2020.S1.012.

物探技术在高铁隧道超前预报中的应用

Application of Geophysical Prospecting Technology in Advance Prediction of High Speed Railway Tunnel

  • 摘要: 在湖北某高铁隧道施工中,综合运用地质雷达法、弹性波反射法2种超前预报技术对隧道的地质情况进行超前预测,并结合隧道的开挖情况,得到结果如下:地质雷达受隧道内导体和电磁干扰影响较大,雷达反射剖面呈现双曲线状同相轴的区域一般为岩溶发育区域,强振幅一般为异常体与正常围岩界面。弹性波反射技术对不规则形态的地质缺陷、含水情况和与隧道轴线平行的不良地质体探测有一定的局限性,对岩体破碎区探测效果较好。通过分析反射波速度,由隧洞轴的交角及洞面的距离来确定反射层所对应界面的空间位置和规模,结合地震波的动力学特征,其异常特征表现为纵横波速比及波速的变化。同时结合预报案例分析了地质雷达、弹性波反射法预报手段的优缺点,可为隧道超前预报方案的优化提供参考。

     

    Abstract: In the construction of a high-speed railway tunnel in Hubei Province, two kinds of advanced prediction techniques, geological radar technique and elastic wave reflection method, are comprehensively used. Combined with the excavation of the tunnel, the results are as follows: Ground penetrating radar(GPR)is greatly affected by the conductor and electromagnetic interference in the tunnel. The radar reflection profile presents hyperbolic shape. The area with the same phase axis is generally the karst development area, and the strong amplitude is generally the interface between the abnormal body and the normal surrounding rock. Elastic wave reflection technology has certain limitations in the detection of irregular geological defects, water content and unfavorable geological bodies parallel to the tunnel axis, and has good detection effect in the broken rock area. Through the analysis of reflected wave velocity, the spatial position and scale of the interface corresponding to the reflecting layer are determined by the intersection angle of tunnel axis and the distance between tunnel surfaces. Combined with the dynamic characteristics of seismic wave, the abnormal characteristics are the change of P-S wave velocity ratio and wave velocity. In this paper, the advantages and disadvantages of GPR and electromagnetic interference prediction methods are analyzed based on the prediction cases, which can provide reference for the optimization of tunnel advanced prediction scheme.

     

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