探地雷达在地下顶管脱空检测中的应用效果分析  

Analysis of application effect of ground penetrating radar in detection of voids around underground jacked pipes

作　　者：杨天春[1,2] 许德根 王齐仁[1] 张正发[1] 

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南科技大学岩土工程稳定控制与健康监测省重点实验室,湖南湘潭411201

出　　处：《河海大学学报（自然科学版）》2016年第4期304-308,共5页Journal of Hohai University(Natural Sciences)

基　　金：湖南省自然科学基金(12JJ6035)

摘　　要：为了对顶管周围的脱空和密实情况进行探测,结合工程实例,采用探地雷达对水泥顶管和钢制顶管开展实践探测工作和试验性探测研究;同时,从理论上建立了水泥顶管和钢管顶管的脱空模型,开展探地雷达二维有限单元法正演模拟。研究结果表明:探地雷达对水泥顶管周围的脱空情况进行探测时,能取得很好的效果;探地雷达对钢制顶管周围的脱空情况进行探测时,由于雷达天线与管壁之间的多次反射信号强烈,对脱空的探测效果很差。因此,探地雷达对于水泥制的顶管脱空检测是可行的,而对于钢制顶管的脱空检测需要研究新的无损检测方法、研制新的设备,以便取得好的应用效果。In order to detect the voids and compactness around jacked pipes,a field survey and experiments were carried out to detect the voids around cement and steel pipes in an engineering case with a ground penetrating radar（ GPR）. A theoretical model for simulating the voids around the cement and steel pipes was established,and forward modeling of the GPR was conducted with the two-dimensional finite element method. The results show that the GPR is effective in detecting the voids around the cement pipes. However,it is not effective in detecting the voids around the steel pipes,because the multiply reflected signals between the radar antenna and pipe wall are strong. It is determined that it is feasible to use GPR to detect the voids around cement pipes. Meanwhile,for the detection of voids around cement pipes,new nondestructive examination methods and new types of equipment have to be developed in order to obtain better application effects.

关 键 词：地下顶管脱空监测 探地雷达 有限单元法 正演模拟 无损检测 

分 类 号：TU992.4[建筑科学—市政工程] TH878[机械工程—仪器科学与技术]