基于模型试验的矿山法地铁隧道支护结构病害检测与识别

发布时间：2018-01-21 07:11

本文关键词： 矿山法隧道支护结构病害探地雷达时域有限差分法正演模拟　出处：《隧道建设》2017年02期 　论文类型：期刊论文

【摘要】：为提高矿山法地铁隧道支护结构病害检测与识别的准确性,采用基于时域有限差分的数值模拟方法,建立常见形状空洞、充水空洞、不同填充介质脱空以及钢格栅拱架、H型钢架下空洞模型,模拟探地雷达波在不同病害中的传播规律,并通过青岛地铁3号线探测实例验证。结果表明:空洞病害雷达反射波通常呈双曲线形状,反射信号强,但上三角形空洞图像与其他空洞图像有较大差异,表现为倾斜平行的同相轴特征;当空洞或脱空内部含水时,空洞或脱空下部出现明显反射波;钢结构雷达波反射强烈,会对钢结构下方病害探测产生干扰,在实际探测中,应将初期支护与二次衬砌分开探测。
[Abstract]:In order to improve the accuracy of mine method for detecting and identifying the defects of subway tunnel support structure, a numerical simulation method based on finite-difference time-domain (FDTD) was used to establish common shape voids and water-filled cavities. The cavitation model of H-shaped steel frame with different filling medium and steel grid arch frame is used to simulate the propagation of ground penetrating radar wave in different diseases. The results show that the reflected wave of the cavity disease radar is usually hyperbolic, and the reflected signal is strong, but the cavity image of the upper triangle is quite different from the other cavity images. The same phase axis characteristic of tilting parallel; When there is water in the cavity or the interior of the cavity, the reflected waves appear in the lower part of the cavity or void. The strong reflection of radar wave in steel structure will interfere with the detection of diseases under the steel structure. In the actual detection, the initial support should be separated from the secondary lining detection.
【作者单位】：山东科技大学矿业与安全工程学院;
【分类号】：U457.2
【正文快照】： 0引言地铁在缓解城市交通压力中发挥着重要的作用,但受隧道设计、施工及运营过程中的一些因素影响,矿山法地铁隧道会出现不同程度的支护结构病害,影响隧道的安全运营和使用寿命[1-3]。探地雷达技术作为一种新的勘探方法,目前广泛应用于地球物理探测方面。利用电磁波在介质传播

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