基于三维地震映像法的地铁盾构区间孤石勘探及其应用

发布时间：2018-01-03 16:18

本文关键词：基于三维地震映像法的地铁盾构区间孤石勘探及其应用　出处：《吉林大学学报(地球科学版)》2017年06期 　论文类型：期刊论文

【摘要】：球状或块状花岗岩不均匀风化残留的风化核(俗称"孤石")在我国南方沿海城市普遍发育。"孤石"经常导致盾构刀盘卡住及损坏,且可能引起地表的隆起等问题,因此在盾构施工前对"孤石"进行探测便于提前处理,是地铁工程勘察的难题。孤石与周围土层波阻抗不同的特点为地震映像法在孤石勘探中的应用提供了理论依据。本文首先介绍三维地震映像法的基本工作原理及方法;其次,建立含有孤石的三维地层模型,模拟三维地层中的地震映像法试验,研究不同位置测线的波形剖面图规律,结果表明:当测线在孤石投影区域内的时候,会产生明显的反射波和绕射波,可清晰观察到孤石的存在,经过数据处理后可确定孤石平面性状及埋深;最后,利用该方法对厦门地铁盾构区间的孤石进行勘探,当发现波形异常,揭示反射频率明显变低、振幅增强、有震荡现象和类似于短弧形的同相轴时,可判断为地下孤石。通过对比勘探结果与钻孔资料,验证了该方法的可靠性。本文提出了地铁孤石的探测及三维成像方法,供类似地区进行地质勘探借鉴。
[Abstract]:A spherical or blocky granite uneven weathering residual weathering nuclear (commonly known as the "boulder") widely distributed in the southern coastal city in China. "Boulder" often leads to shield cutter stuck and damage, and may cause the surface uplift and other issues, so to facilitate the early detection of "boulder" before the construction, is a difficult problem the subway engineering investigation. The boulder and soil layers around different wave impedance provides a theoretical basis for the application of seismic imaging method in Boulder prospecting. The basic principle and method of this paper firstly introduced the 3D seismic imaging method; second, the establishment of 3D stratum model containing boulders, simulation of seismic imaging method to test 3D stratum. The law, the wave profile of different position line results show that when the measuring line in Gushi projection area, will produce the reflection wave and the diffracted wave obviously, can be clearly observed in Boulder deposit In, after data processing can determine the character and depth of Gushi plane; finally, using the method of boulder Xiamen metro shield interval for exploration, when found abnormal waveform, reveals the reflection frequency was low, amplitude enhancement, shock phenomenon and similar to the short arc phase axis, can be judged for the underground boulder through the comparison. The exploration results and drilling data, verify the reliability of the method proposed in this paper. Detection of subway boulders and 3D imaging method for similar areas of geological exploration for reference.

【作者单位】：厦门理工学院土木工程与建筑学院;上海交通大学船舶海洋与建筑工程学院;厦门市建设局;
【基金】：福建省自然科学基金项目(2016J01271) 福建省建筑产业现代化闽台科技合作基地项目(160050208)~~
【分类号】：P631.4;U231;U455.43
【正文快照】： 2.上海交通大学船舶海洋与建筑工程学院,上海2002403.厦门市建设局,福建厦门361003Boulder Detection in Metro Shield Zones Basedon 3DSeismic Method,and Its ApplicationShi Youzhi 1,2,Lin Shuzhi 3,Che Ailan2,Hui Xiangyu2,Feng Shaokong2,Huang Yulin11.School of Civ

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