微动探测技术在轨道交通工程勘察中的应用研究
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摘要
本文介绍了近期在城市轨道交通勘察工作中,为了解决遇到的地下人防空洞、活动断裂、土石界面、溶洞、球状风化体等地质现象的分布规律,确保地铁建设工作的顺利进行,首次应用微动探测技术并取得显著效果的一系列工程实例。微动探测技术是通过放置在工作区内的数台拾震仪,按照某种阵列同步地记录天然场微动信号,然后以平稳随机过程理论为依据,从微动信号中提取面波的频散曲线,通过对频散曲线的反演得到地下介质的横波速度结构,最后结合少量勘探钻孔资料得出地下岩性变化的界面深度。该方法施工简单,费用低、耗时少,对周围环境无任何影响。因此,微动探测技术在城市轨道交通勘察工作中具有非常好的应用前景。
This paper introduces a series of engineering examples in urban rail transport’ survey recently, in order to resolve the difficulties encountered were air-raid shelter underground, active faults, the interface between earth and rock, cave, magmatic rocks spherical weathering and other special geological phenomena’ distribution and to ensure the success of subway construction, apply the microtremor survey technology firstly and achieve remarkable results For the microtremor survey technology, first, microlremors are observed simultaneously by a number of seismometers deployed in an area on the ground surface, then, phase velocity of surface wave is calculated from the observed microtremors using stationary stochastic process theory, the subsurface shear wave velocity structure is estimated by phase velocity inversion, finally, the interface depth of underground rock changes can be acquired combining with a small amount of drilling data. Compared with the traditional geophysical methods, the method does not need to drill a borehole, thus it can save both money and time and be gentle to the environment. Therefore, the microtremor survey technology has a very good application prospects in urban rail transport’ survey .
This paper introduces a series of engineering examples in urban rail transport’ survey recently, in order to resolve the difficulties encountered were air-raid shelter underground, active faults, the interface between earth and rock, cave, magmatic rocks spherical weathering and other special geological phenomena’ distribution and to ensure the success of subway construction, apply the microtremor survey technology firstly and achieve remarkable results For the microtremor survey technology, first, microlremors are observed simultaneously by a number of seismometers deployed in an area on the ground surface, then, phase velocity of surface wave is calculated from the observed microtremors using stationary stochastic process theory, the subsurface shear wave velocity structure is estimated by phase velocity inversion, finally, the interface depth of underground rock changes can be acquired combining with a small amount of drilling data. Compared with the traditional geophysical methods, the method does not need to drill a borehole, thus it can save both money and time and be gentle to the environment. Therefore, the microtremor survey technology has a very good application prospects in urban rail transport’ survey .
引文
[1]叶太兰.微动台阵探测技术及其应用研究[J].中国地震,2004,20(1):47～52.
[2]孙勇军,徐佩芬,凌甦群,等.微动勘查方法及其研究进展[J].地球物理学进展,2009,24(1):326～334.
[3]侯超.微动测深勘查施工方法在漳村煤矿地质勘探中的应用[J].煤,2008,17(10):51～53.
[4]张世民,王丹丹,等.北京南口～孙河断裂带北段晚第四纪活动的层序地层学研究[J].地震地质,2007,29(4):729.
[2]孙勇军,徐佩芬,凌甦群,等.微动勘查方法及其研究进展[J].地球物理学进展,2009,24(1):326～334.
[3]侯超.微动测深勘查施工方法在漳村煤矿地质勘探中的应用[J].煤,2008,17(10):51～53.
[4]张世民,王丹丹,等.北京南口～孙河断裂带北段晚第四纪活动的层序地层学研究[J].地震地质,2007,29(4):729.
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