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在简要介绍北京某地铁工程工程地质背景的基础上,提出了在盾构法施工区间地质雷达测线布置方法,通过对探测成果的分析研究及对部分异常的挖探验证,确定了空洞异常的分布范围及其性质。结果表明,F站~L站区间内共发现有3处明显的土体异常:1号和3号异常为土层严重疏松,2号异常为土体脱空;地质雷达能准确地探测土层疏松以及空洞异常,进而提供地下空洞基础资料。
On the basis of a brief introduction of the engineering geological background of a subway project in Beijing, a method of geologic radar survey line arrangement in the construction interval of shield tunneling is proposed. Through the analysis of the exploration results and the verification of some abnormal excavations, Distribution and its nature. The results show that three obvious soil anomalies were found in the interval from station F to station L: the anomalies of No.1 and No.3 were serious loosening of the soil layer and the anomaly of No.2 was the emptying of the soil; the GPR can accurately detect the soil layer Loose and empty anomalies, and thus provide underground ground-based information.