跨孔声波CT技术在花岗岩球状风化体探测中的应用

发布时间：2018-04-21 01:30

本文选题：工程地质 + 声波CT　；参考：《岩石力学与工程学报》2017年S1期

【摘要】：花岗岩球状风化体(孤石)是花岗岩风化程度不均产生的残留,直接影响到地铁盾构施工的安全性,高效、准确地探明孤石分布是地铁工程勘察面临的难题。利用自主研制的电火花震源等探测系统和地质专家分析法,在探测区域周边的钻孔中进行震源的发射和声波的接收,根据纵波在孤石和周边地质中具有不同的传播速度等原理,通过对声波初至旅行时的记录和解译,反演成为探测区域的三维声波速度场,直观地表达了探测区域的内部地质构造。以某市地铁隧道孤石调查为实例,验证了该方法的有效性和可靠性。结果显示,跨孔声波CT技术能有效地揭示孤石的空间分布,成果图像形象直观,可较好地解决该类地质勘察难题,能够为后续施工提供科学依据。
[Abstract]:Granitic globular weathering body (solitary stone) is the residual of granite weathering degree, which directly affects the safety of shield construction of subway. It is a difficult problem for subway engineering investigation to find out the distribution of solitary stone efficiently and accurately. Using the independently developed electric spark source detection system and geological expert analysis method, the source emission and acoustic wave reception are carried out in the boreholes around the exploration area. According to the principle that the longitudinal wave has different propagation velocity in the isolated rock and the surrounding geology, By recording and interpreting the first arrival of the acoustic wave, the inversion becomes the three-dimensional acoustic velocity field of the exploration area, and the internal geological structure of the exploration area is expressed intuitively. The effectiveness and reliability of the method are verified by a case study of isolated stone in a subway tunnel in a certain city. The results show that the cross-hole CT technique can effectively reveal the spatial distribution of the solitary stone, visualize the image of the results, solve the difficult problem of geological survey, and provide scientific basis for the subsequent construction.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中铁西南科学研究院;
【基金】：国家重点基础研究发展计划(973)项目(2015CB057905) 中国科学院重点部署项目百人计划项目(KZZD EW TZ 12) 国家自然科学基金资助项目(51409263)~~
【分类号】：P631.4;U231.1;U455.43

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