探地雷达在花岗岩球状风化体探测中的应用

花岗岩发育地区球状风化体(俗称"孤石")的分布直接影响城市轨道交通工程的建设,准确探明花岗岩孤石的空间分布具有重要的现实意义.为了探明地铁建设过程中花岗岩孤石分布情况,结合深圳地铁11号线某区间孤石探测试验,采用探地雷达研究两孔间孤石分布情况,试验数据能较好反映出土层间反射回波的异常.试验分析结果与现场验证钻孔的对比表明:该物探方法能在一定程度上揭示孤石的空间分布,表明了探地雷达在孤石探测上的有效性和适用性.

Application of Ground Penetrating Radar in the Detection of the Granite Globular Weathering Body

The distribution of the spherical weathered granite (commonly known as the " boulder ") has a direct impact on the construction of urban rail transit project. It is of great practical significance to detect spatial distribution of boulder accurately. In order to ascertain the distribution of granite boulders during subway construction, with the combination of an instance of geophysical testing for the distribution of granite boulders at the site of Shenzhen Metro Line 11, the distribution of granite boulders between two wells was studied with ground penetrating radar. The experimental data could better reflect the abnormality of reversed echo between boulder and surrounding soil. Test results and field-proven drilling showed that the geophysical method was satisfactory in detecting the spatial distribution of granite boulders to a certain degree, which proved the effectiveness and applicability of the detecting granite boulders with ground penetrating radar.