综合物探技术在跨地铁建筑场地地基勘察中的应用  

Application of Comprehensive Geophysical Prospecting in the Building Foundation Above Metro

作　　者：占文锋[1] 王强[1] 贺学海 

机构地区：[1]北京工业职业技术学院建筑工程系,北京100042 [2]北京时信基业岩土科技有限公司,北京100142

出　　处：《施工技术》2015年第7期55-59,共5页Construction Technology

基　　金：北京市教育委员会科技计划面上资助项目(KM201310853004)

摘　　要：拟建办公楼临近及上跨北京地铁4号线,为查明场地地基土特性、地下管线分布、地铁隧道的位置和埋深等情况,采用多种物探手段开展综合探测。运用高密度电法和地质雷达获取地铁隧道的位置、埋深和宽度等数据,两种方法的探测结果具有一致性,但在反演深度时均存在误差,而引起误差的原因则各不相同;以管线探测仪为主,地质雷达为辅,结合现场调查,绘制出场地内地下管线分布图。运用微动测试获得不同时段、不同位置的场地特征周期和振动幅值,分析表明地铁运行对拟建场地具有影响。运用剪切波速测试计算出相应的等效剪切波速度,对场地土层和场地类型进行了分类,并从场地土特性角度探讨了振动在介质中的传播规律。The planned building is closed to or over spanned Metro Line 4 of Beijing. To find out the characteristics of foundation soil, the distribution of underground pipelines, the metro tunnel location and buried depth, etc, the comprehensive geophysical techniques were used. The high-density resistivity method and ground penetrating radar （ GPR） were used to detect the metro tunnel location, buried depth and width, both obtained the similar results, but there was error during inversing the buried depth, and the causes of the error were different. Based on pipeline detector, and combined with the GPR and field investigation, the distribution maps of the underground pipelines were drew. The pulsation measurement technology was used to obtain the predominant period and the amplitude at different positions and depth during different times, the comparative analysis showed that the metro running evoked the dynamic response on the foundation. The shear wave velocity measurement was used and calculated the equivalent shear wave velocity, the foundation soil layers and the foundation type were classed, and the rule of the vibration transmitted in the foundation was discussed.

关 键 词：地铁 隧道 地基 勘察 雷达 探测 

分 类 号：TU412[建筑科学—岩土工程]