【摘 要】
：
本文利用微动二维剖面探测武汉地铁8号线洪山区政府站～湖北省农科院站区间岩溶,获得结论为:1)测区内溶洞段波速500m/s以下,岩溶发育段600～1003m/s,岩溶不发育段1003～2600m/s;将
【机 构】
：
中国地震局地震研究所(地震大地测量重点实验室),武汉,430071中国地震局地震研究所(地震大地测量重点实验室),武汉,430071;浙江省地震局,杭州,310013
【出 处】
：
2019年(第八届)国际桥梁与隧道技术大会
论文部分内容阅读
本文利用微动二维剖面探测武汉地铁8号线洪山区政府站～湖北省农科院站区间岩溶,获得结论为:1)测区内溶洞段波速500m/s以下,岩溶发育段600～1003m/s,岩溶不发育段1003～2600m/s;将灰岩区S波速度500m/s以下作为判断溶洞或溶穴的依据.2)该测线覆盖层在8～20m,上面地层为第四系覆盖层,主要由素填土、杂填土、粉质黏土以及红黏土组成,波速异常变化较大,土层性质不均匀.下伏层为基岩,即灰岩,灰岩层在范围为20～40m以及50m以下区域内岩溶发育.3)在埋深为20m～40m范围内,微动二维剖面观测实验第一个测点处,埋深约40m处,有波速异常区,解释为溶洞且溶洞垂高约为8m.另在第四个观测点处,埋深约30m处揭露低速区,判定为溶洞,垂高超过5m.4)整条剖面埋深50m以下,岩溶发育,规模较大,尤其是第2～4个观测点均揭示岩溶垂高超过5m,且相互之间可能有溶沟等连通.5)二维微动剖面S波速度在横向上不连续,发育形式主要为岩溶管道类型.
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