摘要
衬砌背后空洞作为隧道常见的一种病害,对隧道支护结构的承载性能有较严重影响。然而,由于探地雷达检测的图像辨析程度及分辨率精度限制,隧道衬砌背后空洞辨识存在一定主观缺陷,且小尺寸空洞更难于辨识,为检测人员所忽视。针对隧道衬砌背后空洞这一特征病害,运用配有600MHz屏蔽天线的地质雷达检测隧道二次衬砌素混凝土区的空洞状况,研究空洞的形状、尺寸、埋深及积水对空洞反射波组特征的影响,并且基于时间域有限差分法(FDTD)采用GPRMAX2D软件对试验模型进行数值模拟分析,将数值模拟的结果与试验模型检测的雷达波组图进行对比验证并加以分析。
Tunnel lining cavity is a common disease,which has a serious impact on the bearing capacity of the tunnel supporting structure. However, since the limit of image resolution accuracy and discrimination degree of ground penetrating radar,there are some subjective defects for identification of tunnel lining cavity. And the small size of the voids ignored by testing personnel easily are difficult to be found. In view of the fact that the tunnel lining cavity is one of the characteristics disease,the geological radar with a 600 MHz shielding antenna is used in this paper to detect concrete cavity status of tunnel secondary lining and research the influence of its shape,size,buried depth and seeper on cavity reflection wave. Based on the finite difference time domain method（FDTD）,GPRMAX2 D is used for numerical simulation analysis. Then it verifies and analyzes results between numerical simulation and model experimental of radar wave photos.
出处
《施工技术》
CAS
北大核心
2017年第1期66-69,共4页
Construction Technology
基金
国家自然科学基金科技项目研究(51509092)
江西省交通厅重点科技项目研究(2011H0019)
